Quarterly report pursuant to Section 13 or 15(d)

GUARANTORS OF SECURITIES (Condensed Cash Flow Statement) (Details)

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GUARANTORS OF SECURITIES (Condensed Cash Flow Statement) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 13,374 $ 28,561
Cash flows from investing activities:    
Purchases of property and equipment (12,524) (5,106)
Proceeds from disposition of property and equipment 5,689 5,910
Return of helicopter deposits 0 544
Investments in and advances to equity investees (126) 0
Principal payments on notes due from equity investees 375 357
Principal payments on third party notes receivable 94 136
Escrow deposits on like-kind exchanges, net 3,777 0
Net cash provided by (used in) investing activities (2,715) 1,841
Cash flows from financing activities:    
Payments on long-term debt (18,162) (9,093)
Proceeds from Revolving Credit Facility 9,000 7,000
Extinguishment of long-term debt 0 (4,331)
Proceeds from share award plans 463 477
Purchase of treasury shares (51) (161)
Borrowings and repayments of intercompany debt 0 0
Net cash used in financing activities (8,750) (6,108)
Effects of exchange rate changes on cash and cash equivalents 19 496
Net increase (decrease) in cash and cash equivalents 1,928 24,790
Cash and cash equivalents, beginning of period 26,950 14,370
Cash and cash equivalents, end of period 28,878 39,160
Reportable Legal Entities | Parent    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1,967 28,465
Cash flows from investing activities:    
Purchases of property and equipment 0 0
Proceeds from disposition of property and equipment 0 0
Return of helicopter deposits   0
Investments in and advances to equity investees 0  
Principal payments on notes due from equity investees 0 0
Principal payments on third party notes receivable 0 0
Escrow deposits on like-kind exchanges, net 0  
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Payments on long-term debt 0 0
Proceeds from Revolving Credit Facility 0 0
Extinguishment of long-term debt   0
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Borrowings and repayments of intercompany debt 0 0
Net cash used in financing activities 0 0
Effects of exchange rate changes on cash and cash equivalents 0 0
Net increase (decrease) in cash and cash equivalents 1,967 28,465
Cash and cash equivalents, beginning of period 25,474 7,565
Cash and cash equivalents, end of period 27,441 36,030
Reportable Legal Entities | Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 11,086 1,126
Cash flows from investing activities:    
Purchases of property and equipment (12,490) (4,974)
Proceeds from disposition of property and equipment 5,689 5,910
Return of helicopter deposits   544
Investments in and advances to equity investees (126)  
Principal payments on notes due from equity investees 375 357
Principal payments on third party notes receivable 94 136
Escrow deposits on like-kind exchanges, net 3,777  
Net cash provided by (used in) investing activities (2,681) 1,973
Cash flows from financing activities:    
Payments on long-term debt (832) (970)
Proceeds from Revolving Credit Facility 0 0
Extinguishment of long-term debt   0
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Borrowings and repayments of intercompany debt (7,588) (4,015)
Net cash used in financing activities (8,420) (4,985)
Effects of exchange rate changes on cash and cash equivalents 15 320
Net increase (decrease) in cash and cash equivalents 0 (1,566)
Cash and cash equivalents, beginning of period 0 3,334
Cash and cash equivalents, end of period 0 1,768
Reportable Legal Entities | Non-guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 321 (1,030)
Cash flows from investing activities:    
Purchases of property and equipment (34) (132)
Proceeds from disposition of property and equipment 0 0
Return of helicopter deposits   0
Investments in and advances to equity investees 0  
Principal payments on notes due from equity investees 0 0
Principal payments on third party notes receivable 0 0
Escrow deposits on like-kind exchanges, net 0  
Net cash provided by (used in) investing activities (34) (132)
Cash flows from financing activities:    
Payments on long-term debt (330) (1,123)
Proceeds from Revolving Credit Facility 0 0
Extinguishment of long-term debt   0
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Borrowings and repayments of intercompany debt 0 0
Net cash used in financing activities (330) (1,123)
Effects of exchange rate changes on cash and cash equivalents 4 176
Net increase (decrease) in cash and cash equivalents (39) (2,109)
Cash and cash equivalents, beginning of period 1,476 3,471
Cash and cash equivalents, end of period 1,437 1,362
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0 0
Cash flows from investing activities:    
Purchases of property and equipment 0 0
Proceeds from disposition of property and equipment 0 0
Return of helicopter deposits   0
Investments in and advances to equity investees 0  
Principal payments on notes due from equity investees 0 0
Principal payments on third party notes receivable 0 0
Escrow deposits on like-kind exchanges, net 0  
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Payments on long-term debt (17,000) (7,000)
Proceeds from Revolving Credit Facility 9,000 7,000
Extinguishment of long-term debt   (4,331)
Proceeds from share award plans 463 477
Purchase of treasury shares (51) (161)
Borrowings and repayments of intercompany debt 7,588 4,015
Net cash used in financing activities 0 0
Effects of exchange rate changes on cash and cash equivalents 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period $ 0 $ 0