GUARANTORS OF SECURITIES (Condensed Balance Sheet) (Details) - USD ($) $ / shares in Units, $ in Thousands |
Sep. 30, 2019 |
Jun. 30, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Dec. 31, 2017 |
Current assets: |
|
|
|
|
|
|
|
|
Cash and cash equivalents |
$ 107,736
|
[1] |
|
$ 50,753
|
[1] |
$ 47,631
|
|
$ 13,583
|
Receivables: |
|
|
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
31,312
|
|
|
33,306
|
|
|
|
|
Trade, dry-leasing |
5,864
|
|
|
3,803
|
|
|
|
|
Tax receivables |
2,705
|
|
|
3,187
|
|
|
|
|
Other |
11,567
|
|
|
2,343
|
|
|
|
|
Inventories, net |
20,826
|
|
|
20,673
|
|
|
|
|
Prepaid expenses |
2,851
|
|
|
1,807
|
|
|
|
|
Total current assets |
182,861
|
|
|
115,872
|
|
|
|
|
Property and equipment |
901,580
|
|
|
917,161
|
|
|
|
|
Accumulated depreciation |
(334,730)
|
|
|
(317,967)
|
|
|
|
|
Property and equipment, net |
566,850
|
|
|
599,194
|
|
|
|
|
Operating lease right-of-use |
9,907
|
|
|
|
|
|
|
|
Equity investments and advances |
0
|
|
|
27,112
|
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
|
0
|
|
|
|
|
Intangible assets |
1,094
|
|
|
1,107
|
|
|
|
|
Deferred income taxes |
0
|
|
|
0
|
|
|
|
|
Intercompany receivables |
0
|
|
|
0
|
|
|
|
|
Other assets |
6,363
|
|
|
21,578
|
|
|
|
|
Total assets |
767,075
|
|
|
764,863
|
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
|
|
Accounts payable and accrued expenses |
11,940
|
|
|
13,161
|
|
|
|
|
Accrued wages and benefits |
8,960
|
|
|
9,267
|
|
|
|
|
Accrued interest |
3,321
|
|
|
569
|
|
|
|
|
Accrued income taxes |
2,945
|
|
|
973
|
|
|
|
|
Accrued other taxes |
1,986
|
|
|
1,268
|
|
|
|
|
Accrued contingencies |
548
|
|
|
630
|
|
|
|
|
Current portion of long-term debt |
1,845
|
|
|
2,058
|
|
|
|
|
Other current liabilities |
2,851
|
|
|
878
|
|
|
|
|
Total current liabilities |
34,396
|
|
|
28,804
|
|
|
|
|
Long-term debt |
158,731
|
|
|
160,217
|
|
|
|
|
Deferred income taxes |
105,440
|
|
|
108,357
|
|
|
|
|
Intercompany payables |
0
|
|
|
0
|
|
|
|
|
Operating lease liabilities |
8,166
|
|
|
|
|
|
|
|
Other liabilities |
850
|
|
|
747
|
|
|
|
|
Total liabilities |
307,583
|
|
|
298,125
|
|
|
|
|
Redeemable noncontrolling interest |
2,945
|
|
$ 3,094
|
3,302
|
|
3,456
|
$ 3,466
|
3,766
|
Equity: |
|
|
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 21,288,619 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
224
|
|
|
219
|
|
|
|
|
Additional paid-in capital |
451,103
|
|
|
447,298
|
|
|
|
|
Retained earnings |
15,372
|
|
|
18,285
|
|
|
|
|
Treasury shares, at cost; 1,149,820 and 156,737 shares in 2019 and 2018, respectively |
(10,152)
|
|
|
(2,476)
|
|
|
|
|
Accumulated other comprehensive income, net of tax |
0
|
|
|
110
|
|
|
|
|
Total equity |
456,547
|
|
$ 458,662
|
463,436
|
|
$ 468,470
|
$ 436,048
|
$ 445,681
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
767,075
|
|
|
764,863
|
|
|
|
|
Allowance for doubtful accounts, trade receivables |
$ 176
|
|
|
$ 261
|
|
|
|
|
Common stock, par value (in dollars per share) |
$ 0.01
|
|
|
$ 0.01
|
|
|
|
|
Common stock, shares authorized (in shares) |
60,000,000
|
|
|
60,000,000
|
|
|
|
|
Common stock, shares outstanding (in shares) |
21,288,619
|
|
|
21,765,404
|
|
|
|
|
Treasury shares (in shares) |
1,149,820
|
|
|
156,737
|
|
|
|
|
Reportable Legal Entities | Parent |
|
|
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
|
|
Cash and cash equivalents |
$ 105,639
|
|
|
$ 48,396
|
|
|
|
|
Receivables: |
|
|
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
0
|
|
|
0
|
|
|
|
|
Trade, dry-leasing |
0
|
|
|
0
|
|
|
|
|
Tax receivables |
0
|
|
|
0
|
|
|
|
|
Other |
0
|
|
|
0
|
|
|
|
|
Inventories, net |
0
|
|
|
0
|
|
|
|
|
Prepaid expenses |
565
|
|
|
398
|
|
|
|
|
Total current assets |
106,204
|
|
|
48,794
|
|
|
|
|
Property and equipment |
0
|
|
|
0
|
|
|
|
|
Accumulated depreciation |
0
|
|
|
0
|
|
|
|
|
Property and equipment, net |
0
|
|
|
0
|
|
|
|
|
Operating lease right-of-use |
0
|
|
|
|
|
|
|
|
Equity investments and advances |
|
|
|
0
|
|
|
|
|
Investments in consolidated subsidiaries |
183,226
|
|
|
172,950
|
|
|
|
|
Intangible assets |
0
|
|
|
0
|
|
|
|
|
Deferred income taxes |
12,774
|
|
|
9,904
|
|
|
|
|
Intercompany receivables |
294,405
|
|
|
366,541
|
|
|
|
|
Other assets |
815
|
|
|
1,251
|
|
|
|
|
Total assets |
597,424
|
|
|
599,440
|
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
|
|
Accounts payable and accrued expenses |
134
|
|
|
136
|
|
|
|
|
Accrued wages and benefits |
32
|
|
|
43
|
|
|
|
|
Accrued interest |
3,261
|
|
|
500
|
|
|
|
|
Accrued income taxes |
2,922
|
|
|
918
|
|
|
|
|
Accrued other taxes |
0
|
|
|
0
|
|
|
|
|
Accrued contingencies |
0
|
|
|
0
|
|
|
|
|
Current portion of long-term debt |
0
|
|
|
0
|
|
|
|
|
Other current liabilities |
885
|
|
|
647
|
|
|
|
|
Total current liabilities |
7,234
|
|
|
2,244
|
|
|
|
|
Long-term debt |
133,662
|
|
|
133,900
|
|
|
|
|
Deferred income taxes |
0
|
|
|
0
|
|
|
|
|
Intercompany payables |
0
|
|
|
0
|
|
|
|
|
Operating lease liabilities |
0
|
|
|
|
|
|
|
|
Other liabilities |
0
|
|
|
0
|
|
|
|
|
Total liabilities |
140,896
|
|
|
136,144
|
|
|
|
|
Redeemable noncontrolling interest |
0
|
|
|
0
|
|
|
|
|
Equity: |
|
|
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 21,288,619 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
224
|
|
|
219
|
|
|
|
|
Additional paid-in capital |
451,104
|
|
|
447,299
|
|
|
|
|
Retained earnings |
15,352
|
|
|
18,254
|
|
|
|
|
Treasury shares, at cost; 1,149,820 and 156,737 shares in 2019 and 2018, respectively |
(10,152)
|
|
|
(2,476)
|
|
|
|
|
Accumulated other comprehensive income, net of tax |
|
|
|
0
|
|
|
|
|
Total equity |
456,528
|
|
|
463,296
|
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
597,424
|
|
|
599,440
|
|
|
|
|
Reportable Legal Entities | Guarantors |
|
|
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
|
|
Cash and cash equivalents |
0
|
|
|
0
|
|
|
|
|
Receivables: |
|
|
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
24,779
|
|
|
27,509
|
|
|
|
|
Trade, dry-leasing |
5,864
|
|
|
3,803
|
|
|
|
|
Tax receivables |
10
|
|
|
6
|
|
|
|
|
Other |
11,305
|
|
|
1,949
|
|
|
|
|
Inventories, net |
20,784
|
|
|
20,633
|
|
|
|
|
Prepaid expenses |
2,046
|
|
|
1,219
|
|
|
|
|
Total current assets |
64,788
|
|
|
55,119
|
|
|
|
|
Property and equipment |
884,816
|
|
|
900,611
|
|
|
|
|
Accumulated depreciation |
(330,543)
|
|
|
(314,567)
|
|
|
|
|
Property and equipment, net |
554,273
|
|
|
586,044
|
|
|
|
|
Operating lease right-of-use |
8,095
|
|
|
|
|
|
|
|
Equity investments and advances |
|
|
|
27,112
|
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
|
0
|
|
|
|
|
Intangible assets |
0
|
|
|
0
|
|
|
|
|
Deferred income taxes |
0
|
|
|
0
|
|
|
|
|
Intercompany receivables |
0
|
|
|
0
|
|
|
|
|
Other assets |
5,145
|
|
|
20,231
|
|
|
|
|
Total assets |
632,301
|
|
|
688,506
|
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
|
|
Accounts payable and accrued expenses |
10,247
|
|
|
11,357
|
|
|
|
|
Accrued wages and benefits |
7,216
|
|
|
7,743
|
|
|
|
|
Accrued interest |
60
|
|
|
69
|
|
|
|
|
Accrued income taxes |
10
|
|
|
6
|
|
|
|
|
Accrued other taxes |
1,693
|
|
|
768
|
|
|
|
|
Accrued contingencies |
0
|
|
|
0
|
|
|
|
|
Current portion of long-term debt |
1,663
|
|
|
1,663
|
|
|
|
|
Other current liabilities |
1,585
|
|
|
220
|
|
|
|
|
Total current liabilities |
22,474
|
|
|
21,826
|
|
|
|
|
Long-term debt |
25,069
|
|
|
26,317
|
|
|
|
|
Deferred income taxes |
116,968
|
|
|
117,015
|
|
|
|
|
Intercompany payables |
231,203
|
|
|
310,727
|
|
|
|
|
Operating lease liabilities |
6,731
|
|
|
|
|
|
|
|
Other liabilities |
850
|
|
|
720
|
|
|
|
|
Total liabilities |
403,295
|
|
|
476,605
|
|
|
|
|
Redeemable noncontrolling interest |
3
|
|
|
3
|
|
|
|
|
Equity: |
|
|
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 21,288,619 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
|
0
|
|
|
|
|
Additional paid-in capital |
100,307
|
|
|
100,306
|
|
|
|
|
Retained earnings |
128,696
|
|
|
111,482
|
|
|
|
|
Treasury shares, at cost; 1,149,820 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
|
0
|
|
|
|
|
Accumulated other comprehensive income, net of tax |
|
|
|
110
|
|
|
|
|
Total equity |
229,003
|
|
|
211,898
|
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
632,301
|
|
|
688,506
|
|
|
|
|
Reportable Legal Entities | Non-guarantors |
|
|
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
|
|
Cash and cash equivalents |
2,097
|
|
|
2,357
|
|
|
|
|
Receivables: |
|
|
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
6,533
|
|
|
5,797
|
|
|
|
|
Trade, dry-leasing |
0
|
|
|
0
|
|
|
|
|
Tax receivables |
2,695
|
|
|
3,181
|
|
|
|
|
Other |
262
|
|
|
394
|
|
|
|
|
Inventories, net |
42
|
|
|
40
|
|
|
|
|
Prepaid expenses |
240
|
|
|
190
|
|
|
|
|
Total current assets |
11,869
|
|
|
11,959
|
|
|
|
|
Property and equipment |
16,764
|
|
|
16,550
|
|
|
|
|
Accumulated depreciation |
(4,187)
|
|
|
(3,400)
|
|
|
|
|
Property and equipment, net |
12,577
|
|
|
13,150
|
|
|
|
|
Operating lease right-of-use |
1,812
|
|
|
|
|
|
|
|
Equity investments and advances |
|
|
|
0
|
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
|
0
|
|
|
|
|
Intangible assets |
1,094
|
|
|
1,107
|
|
|
|
|
Deferred income taxes |
0
|
|
|
0
|
|
|
|
|
Intercompany receivables |
47
|
|
|
0
|
|
|
|
|
Other assets |
403
|
|
|
96
|
|
|
|
|
Total assets |
27,802
|
|
|
26,312
|
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
|
|
Accounts payable and accrued expenses |
1,559
|
|
|
1,668
|
|
|
|
|
Accrued wages and benefits |
1,712
|
|
|
1,481
|
|
|
|
|
Accrued interest |
0
|
|
|
0
|
|
|
|
|
Accrued income taxes |
13
|
|
|
49
|
|
|
|
|
Accrued other taxes |
293
|
|
|
500
|
|
|
|
|
Accrued contingencies |
548
|
|
|
630
|
|
|
|
|
Current portion of long-term debt |
182
|
|
|
395
|
|
|
|
|
Other current liabilities |
381
|
|
|
11
|
|
|
|
|
Total current liabilities |
4,688
|
|
|
4,734
|
|
|
|
|
Long-term debt |
0
|
|
|
0
|
|
|
|
|
Deferred income taxes |
1,246
|
|
|
1,245
|
|
|
|
|
Intercompany payables |
63,271
|
|
|
55,847
|
|
|
|
|
Operating lease liabilities |
1,435
|
|
|
|
|
|
|
|
Other liabilities |
0
|
|
|
27
|
|
|
|
|
Total liabilities |
70,640
|
|
|
61,853
|
|
|
|
|
Redeemable noncontrolling interest |
2,942
|
|
|
3,299
|
|
|
|
|
Equity: |
|
|
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 21,288,619 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
|
0
|
|
|
|
|
Additional paid-in capital |
4,561
|
|
|
4,562
|
|
|
|
|
Retained earnings |
(50,341)
|
|
|
(43,402)
|
|
|
|
|
Treasury shares, at cost; 1,149,820 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
|
0
|
|
|
|
|
Accumulated other comprehensive income, net of tax |
|
|
|
0
|
|
|
|
|
Total equity |
(45,780)
|
|
|
(38,840)
|
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
27,802
|
|
|
26,312
|
|
|
|
|
Eliminations |
|
|
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
|
|
Cash and cash equivalents |
0
|
|
|
0
|
|
|
|
|
Receivables: |
|
|
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
0
|
|
|
0
|
|
|
|
|
Trade, dry-leasing |
0
|
|
|
0
|
|
|
|
|
Tax receivables |
0
|
|
|
0
|
|
|
|
|
Other |
0
|
|
|
0
|
|
|
|
|
Inventories, net |
0
|
|
|
0
|
|
|
|
|
Prepaid expenses |
0
|
|
|
0
|
|
|
|
|
Total current assets |
0
|
|
|
0
|
|
|
|
|
Property and equipment |
0
|
|
|
0
|
|
|
|
|
Accumulated depreciation |
0
|
|
|
0
|
|
|
|
|
Property and equipment, net |
0
|
|
|
0
|
|
|
|
|
Operating lease right-of-use |
0
|
|
|
|
|
|
|
|
Equity investments and advances |
|
|
|
0
|
|
|
|
|
Investments in consolidated subsidiaries |
(183,226)
|
|
|
(172,950)
|
|
|
|
|
Intangible assets |
0
|
|
|
0
|
|
|
|
|
Deferred income taxes |
(12,774)
|
|
|
(9,904)
|
|
|
|
|
Intercompany receivables |
(294,452)
|
|
|
(366,541)
|
|
|
|
|
Other assets |
0
|
|
|
0
|
|
|
|
|
Total assets |
(490,452)
|
|
|
(549,395)
|
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
|
|
Accounts payable and accrued expenses |
0
|
|
|
0
|
|
|
|
|
Accrued wages and benefits |
0
|
|
|
0
|
|
|
|
|
Accrued interest |
0
|
|
|
0
|
|
|
|
|
Accrued income taxes |
0
|
|
|
0
|
|
|
|
|
Accrued other taxes |
0
|
|
|
0
|
|
|
|
|
Accrued contingencies |
0
|
|
|
0
|
|
|
|
|
Current portion of long-term debt |
0
|
|
|
0
|
|
|
|
|
Other current liabilities |
0
|
|
|
0
|
|
|
|
|
Total current liabilities |
0
|
|
|
0
|
|
|
|
|
Long-term debt |
0
|
|
|
0
|
|
|
|
|
Deferred income taxes |
(12,774)
|
|
|
(9,903)
|
|
|
|
|
Intercompany payables |
(294,474)
|
|
|
(366,574)
|
|
|
|
|
Operating lease liabilities |
0
|
|
|
|
|
|
|
|
Other liabilities |
0
|
|
|
0
|
|
|
|
|
Total liabilities |
(307,248)
|
|
|
(376,477)
|
|
|
|
|
Redeemable noncontrolling interest |
0
|
|
|
0
|
|
|
|
|
Equity: |
|
|
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 21,288,619 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
|
0
|
|
|
|
|
Additional paid-in capital |
(104,869)
|
|
|
(104,869)
|
|
|
|
|
Retained earnings |
(78,335)
|
|
|
(68,049)
|
|
|
|
|
Treasury shares, at cost; 1,149,820 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
|
0
|
|
|
|
|
Accumulated other comprehensive income, net of tax |
|
|
|
0
|
|
|
|
|
Total equity |
(183,204)
|
|
|
(172,918)
|
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
$ (490,452)
|
|
|
$ (549,395)
|
|
|
|
|
|
|