GUARANTORS OF SECURITIES Supplemental Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Condensed Cash Flow Statements, Captions [Line Items] |
|
|
|
| Net cash provided by operating activities |
$ 20,096
|
$ 58,504
|
$ 44,456
|
| Cash flows from investing activities: |
|
|
|
| Purchases of property and equipment |
(16,770)
|
(39,200)
|
(60,050)
|
| Proceeds from disposition of property and equipment |
9,392
|
28,609
|
25,328
|
| Cash settlements on forward contracts, net |
0
|
0
|
(1,103)
|
| Return of helicopter deposits |
0
|
544
|
0
|
| Business acquisitions, net of cash acquired |
0
|
0
|
(1,747)
|
| Investments in and advances to equity investees |
(126)
|
0
|
(36)
|
| Proceeds from sale of FBO |
0
|
0
|
14,252
|
| Principal payments on notes due from equity investees |
761
|
723
|
688
|
| Principal payments on third party notes receivable |
169
|
208
|
52
|
| Escrow deposits on like-kind exchanges, net |
527
|
(3,658)
|
(191)
|
| Repayment of intercompany debt |
|
0
|
0
|
| Net cash used in investing activities |
(6,047)
|
(12,774)
|
(22,807)
|
| Cash flows from financing activities: |
|
|
|
| Proceeds from Revolving Credit Facility |
17,000
|
12,000
|
60,000
|
| Long-term debt issuance costs |
0
|
(886)
|
(71)
|
| Payments on long-term debt |
(45,281)
|
(40,444)
|
(57,925)
|
| Extinguishment of long-term debt |
0
|
(4,331)
|
(46,920)
|
| Proceeds and tax benefits from share award plans |
836
|
836
|
1,096
|
| Tax expense on vested restricted stock |
0
|
0
|
(127)
|
| Purchase of treasury shares |
(52)
|
(161)
|
(2,079)
|
| Borrowings and repayments of intercompany debt |
0
|
0
|
0
|
| Net cash used in financing activities |
(27,497)
|
(32,986)
|
(46,026)
|
| Effects of exchange rate changes on cash and cash equivalents |
81
|
(164)
|
(2,120)
|
| Net increase (decrease) in cash and cash equivalents |
(13,367)
|
12,580
|
(26,497)
|
| Cash and cash equivalents, beginning of year |
26,950
|
14,370
|
40,867
|
| Cash and cash equivalents, end of year |
13,583
|
26,950
|
14,370
|
| Parent |
|
|
|
| Condensed Cash Flow Statements, Captions [Line Items] |
|
|
|
| Net cash provided by operating activities |
(14,706)
|
17,909
|
(8,916)
|
| Cash flows from investing activities: |
|
|
|
| Purchases of property and equipment |
0
|
0
|
0
|
| Proceeds from disposition of property and equipment |
0
|
0
|
0
|
| Cash settlements on forward contracts, net |
|
|
0
|
| Return of helicopter deposits |
|
0
|
|
| Business acquisitions, net of cash acquired |
|
|
0
|
| Investments in and advances to equity investees |
0
|
|
0
|
| Proceeds from sale of FBO |
|
|
0
|
| Principal payments on notes due from equity investees |
0
|
0
|
0
|
| Principal payments on third party notes receivable |
0
|
0
|
0
|
| Escrow deposits on like-kind exchanges, net |
0
|
0
|
0
|
| Repayment of intercompany debt |
|
0
|
0
|
| Net cash used in investing activities |
0
|
0
|
0
|
| Cash flows from financing activities: |
|
|
|
| Proceeds from Revolving Credit Facility |
0
|
0
|
0
|
| Long-term debt issuance costs |
|
0
|
0
|
| Payments on long-term debt |
0
|
0
|
0
|
| Extinguishment of long-term debt |
|
0
|
0
|
| Proceeds and tax benefits from share award plans |
0
|
0
|
0
|
| Tax expense on vested restricted stock |
|
|
0
|
| Purchase of treasury shares |
0
|
0
|
0
|
| Borrowings and repayments of intercompany debt |
0
|
0
|
0
|
| Net cash used in financing activities |
0
|
0
|
0
|
| Effects of exchange rate changes on cash and cash equivalents |
32
|
0
|
0
|
| Net increase (decrease) in cash and cash equivalents |
(14,674)
|
17,909
|
(8,916)
|
| Cash and cash equivalents, beginning of year |
25,474
|
7,565
|
16,481
|
| Cash and cash equivalents, end of year |
10,800
|
25,474
|
7,565
|
| Guarantors |
|
|
|
| Condensed Cash Flow Statements, Captions [Line Items] |
|
|
|
| Net cash provided by operating activities |
32,601
|
41,239
|
38,111
|
| Cash flows from investing activities: |
|
|
|
| Purchases of property and equipment |
(16,600)
|
(39,020)
|
(60,046)
|
| Proceeds from disposition of property and equipment |
9,392
|
28,381
|
37,098
|
| Cash settlements on forward contracts, net |
|
|
(1,103)
|
| Return of helicopter deposits |
|
544
|
|
| Business acquisitions, net of cash acquired |
|
|
0
|
| Investments in and advances to equity investees |
(126)
|
|
(36)
|
| Proceeds from sale of FBO |
|
|
0
|
| Principal payments on notes due from equity investees |
761
|
723
|
688
|
| Principal payments on third party notes receivable |
169
|
208
|
52
|
| Escrow deposits on like-kind exchanges, net |
527
|
(3,848)
|
(1)
|
| Repayment of intercompany debt |
|
190
|
14,062
|
| Net cash used in investing activities |
(5,877)
|
(12,822)
|
(9,286)
|
| Cash flows from financing activities: |
|
|
|
| Proceeds from Revolving Credit Facility |
8,000
|
0
|
0
|
| Long-term debt issuance costs |
|
0
|
(71)
|
| Payments on long-term debt |
(1,526)
|
(1,803)
|
(2,458)
|
| Extinguishment of long-term debt |
|
0
|
0
|
| Proceeds and tax benefits from share award plans |
0
|
0
|
0
|
| Tax expense on vested restricted stock |
|
|
0
|
| Purchase of treasury shares |
0
|
0
|
0
|
| Borrowings and repayments of intercompany debt |
(33,216)
|
(29,542)
|
(43,030)
|
| Net cash used in financing activities |
(26,742)
|
(31,345)
|
(45,559)
|
| Effects of exchange rate changes on cash and cash equivalents |
18
|
(406)
|
(2,120)
|
| Net increase (decrease) in cash and cash equivalents |
0
|
(3,334)
|
(18,854)
|
| Cash and cash equivalents, beginning of year |
0
|
3,334
|
22,188
|
| Cash and cash equivalents, end of year |
0
|
0
|
3,334
|
| Non-guarantors |
|
|
|
| Condensed Cash Flow Statements, Captions [Line Items] |
|
|
|
| Net cash provided by operating activities |
2,201
|
(644)
|
15,261
|
| Cash flows from investing activities: |
|
|
|
| Purchases of property and equipment |
(170)
|
(180)
|
(11,774)
|
| Proceeds from disposition of property and equipment |
0
|
228
|
0
|
| Cash settlements on forward contracts, net |
|
|
0
|
| Return of helicopter deposits |
|
0
|
|
| Business acquisitions, net of cash acquired |
|
|
(1,747)
|
| Investments in and advances to equity investees |
0
|
|
0
|
| Proceeds from sale of FBO |
|
|
0
|
| Principal payments on notes due from equity investees |
0
|
0
|
0
|
| Principal payments on third party notes receivable |
0
|
0
|
0
|
| Escrow deposits on like-kind exchanges, net |
0
|
0
|
0
|
| Repayment of intercompany debt |
|
0
|
0
|
| Net cash used in investing activities |
(170)
|
48
|
(13,521)
|
| Cash flows from financing activities: |
|
|
|
| Proceeds from Revolving Credit Facility |
0
|
0
|
0
|
| Long-term debt issuance costs |
|
0
|
0
|
| Payments on long-term debt |
(755)
|
(1,641)
|
(467)
|
| Extinguishment of long-term debt |
|
0
|
0
|
| Proceeds and tax benefits from share award plans |
0
|
0
|
0
|
| Tax expense on vested restricted stock |
|
|
0
|
| Purchase of treasury shares |
0
|
0
|
0
|
| Borrowings and repayments of intercompany debt |
0
|
0
|
0
|
| Net cash used in financing activities |
(755)
|
(1,641)
|
(467)
|
| Effects of exchange rate changes on cash and cash equivalents |
31
|
242
|
0
|
| Net increase (decrease) in cash and cash equivalents |
1,307
|
(1,995)
|
1,273
|
| Cash and cash equivalents, beginning of year |
1,476
|
3,471
|
2,198
|
| Cash and cash equivalents, end of year |
2,783
|
1,476
|
3,471
|
| Eliminations |
|
|
|
| Condensed Cash Flow Statements, Captions [Line Items] |
|
|
|
| Net cash provided by operating activities |
0
|
0
|
0
|
| Cash flows from investing activities: |
|
|
|
| Purchases of property and equipment |
0
|
|
11,770
|
| Proceeds from disposition of property and equipment |
0
|
|
(11,770)
|
| Cash settlements on forward contracts, net |
|
|
0
|
| Return of helicopter deposits |
|
0
|
|
| Business acquisitions, net of cash acquired |
|
|
0
|
| Investments in and advances to equity investees |
0
|
|
0
|
| Proceeds from sale of FBO |
|
|
14,252
|
| Principal payments on notes due from equity investees |
0
|
0
|
0
|
| Principal payments on third party notes receivable |
0
|
0
|
0
|
| Escrow deposits on like-kind exchanges, net |
0
|
190
|
(190)
|
| Repayment of intercompany debt |
|
(190)
|
(14,062)
|
| Net cash used in investing activities |
0
|
0
|
0
|
| Cash flows from financing activities: |
|
|
|
| Proceeds from Revolving Credit Facility |
9,000
|
12,000
|
60,000
|
| Long-term debt issuance costs |
|
(886)
|
0
|
| Payments on long-term debt |
(43,000)
|
(37,000)
|
(55,000)
|
| Extinguishment of long-term debt |
|
(4,331)
|
(46,920)
|
| Proceeds and tax benefits from share award plans |
836
|
836
|
1,096
|
| Tax expense on vested restricted stock |
|
|
(127)
|
| Purchase of treasury shares |
(52)
|
(161)
|
(2,079)
|
| Borrowings and repayments of intercompany debt |
33,216
|
29,542
|
43,030
|
| Net cash used in financing activities |
0
|
0
|
0
|
| Effects of exchange rate changes on cash and cash equivalents |
0
|
0
|
0
|
| Net increase (decrease) in cash and cash equivalents |
0
|
0
|
0
|
| Cash and cash equivalents, beginning of year |
0
|
0
|
0
|
| Cash and cash equivalents, end of year |
$ 0
|
$ 0
|
$ 0
|