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
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 17,928 $ 46,483
Cash flows from investing activities:    
Purchases of property and equipment (13,121) (10,712)
Proceeds from disposition of property and equipment 5,690 6,138
Return of helicopter deposits 0 544
Investments in and advances to equity investees (126) 0
Principal payments on notes due from equity investees 564 539
Principal payments on third party notes receivable 94 212
Escrow deposits on like-kind exchanges, net 3,777 0
Net cash used in investing activities (3,122) (3,279)
Cash flows from financing activities:    
Payments on long-term debt (24,745) (29,538)
Proceeds from Revolving Credit Facility 9,000 7,000
Extinguishment of long-term debt 0 (4,331)
Proceeds from share award plans 836 836
Purchase of treasury shares (52) (161)
Borrowings and repayments of intercompany debt 0 0
Net cash used in financing activities (14,961) (26,194)
Effects of exchange rate changes on cash and cash equivalents 101 764
Net increase (decrease) in cash and cash equivalents (54) 17,774
Cash and cash equivalents, beginning of period 26,950 14,370
Cash and cash equivalents, end of period 26,896 32,144
Reportable Legal Entities | Parent    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (267) 21,127
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 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 27 0
Net increase (decrease) in cash and cash equivalents (240) 21,127
Cash and cash equivalents, beginning of period 25,474 7,565
Cash and cash equivalents, end of period 25,234 28,692
Reportable Legal Entities | Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 17,477 26,296
Cash flows from investing activities:    
Purchases of property and equipment (13,013) (10,537)
Proceeds from disposition of property and equipment 5,690 5,910
Return of helicopter deposits   544
Investments in and advances to equity investees (126)  
Principal payments on notes due from equity investees 564 539
Principal payments on third party notes receivable 94 212
Escrow deposits on like-kind exchanges, net 3,777  
Net cash used in investing activities (3,014) (3,332)
Cash flows from financing activities:    
Payments on long-term debt (1,247) (1,386)
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 (13,216) (23,656)
Net cash used in financing activities (14,463) (25,042)
Effects of exchange rate changes on cash and cash equivalents 0 346
Net increase (decrease) in cash and cash equivalents 0 (1,732)
Cash and cash equivalents, beginning of period 0 3,334
Cash and cash equivalents, end of period 0 1,602
Reportable Legal Entities | Non-guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 718 (940)
Cash flows from investing activities:    
Purchases of property and equipment (108) (175)
Proceeds from disposition of property and equipment 0 228
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 used in investing activities (108) 53
Cash flows from financing activities:    
Payments on long-term debt (498) (1,152)
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 (498) (1,152)
Effects of exchange rate changes on cash and cash equivalents 74 418
Net increase (decrease) in cash and cash equivalents 186 (1,621)
Cash and cash equivalents, beginning of period 1,476 3,471
Cash and cash equivalents, end of period 1,662 1,850
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 used in investing activities 0 0
Cash flows from financing activities:    
Payments on long-term debt (23,000) (27,000)
Proceeds from Revolving Credit Facility 9,000 7,000
Extinguishment of long-term debt   (4,331)
Proceeds from share award plans 836 836
Purchase of treasury shares (52) (161)
Borrowings and repayments of intercompany debt 13,216 23,656
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