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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 4,253 $ 14,793
Cash flows from investing activities:    
Purchases of property and equipment (1,005) (2,145)
Proceeds from disposition of property and equipment 126 3,980
Return of helicopter deposits 0 544
Investments in and advances to equity investees (114) 0
Principal payments on notes due from equity investees 185 177
Principal payments on third party notes receivable 56 46
Net cash provided by (used in) investing activities (752) 2,602
Cash flows from financing activities:    
Payments on long-term debt (6,581) (8,651)
Proceeds from Revolving Credit Facility 2,000 7,000
Proceeds from share award plans 463 477
Purchase of treasury shares (51) (161)
Repayment of intercompany debt 0 0
Net cash used in financing activities (4,169) (1,335)
Effects of exchange rate changes on cash and cash equivalents 57 373
Net increase (decrease) in cash and cash equivalents (611) 16,433
Cash and cash equivalents, beginning of period 26,950 14,370
Cash and cash equivalents, end of period 26,339 30,803
Parent    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (639) 19,154
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
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
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Repayment 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 (639) 19,154
Cash and cash equivalents, beginning of period 25,474 7,565
Cash and cash equivalents, end of period 24,835 26,719
Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 4,718 (3,220)
Cash flows from investing activities:    
Purchases of property and equipment (971) (2,090)
Proceeds from disposition of property and equipment 126 3,980
Return of helicopter deposits   544
Investments in and advances to equity investees (114)  
Principal payments on notes due from equity investees 185 177
Principal payments on third party notes receivable 56 46
Net cash provided by (used in) investing activities (718) 2,657
Cash flows from financing activities:    
Payments on long-term debt (415) (555)
Proceeds from Revolving Credit Facility 0 0
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Repayment of intercompany debt (3,588) 316
Net cash used in financing activities (4,003) (239)
Effects of exchange rate changes on cash and cash equivalents 3 368
Net increase (decrease) in cash and cash equivalents 0 (434)
Cash and cash equivalents, beginning of period 0 3,334
Cash and cash equivalents, end of period 0 2,900
Non-guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 174 (1,491)
Cash flows from investing activities:    
Purchases of property and equipment (34) (55)
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
Net cash provided by (used in) investing activities (34) (55)
Cash flows from financing activities:    
Payments on long-term debt (166) (1,096)
Proceeds from Revolving Credit Facility 0 0
Proceeds from share award plans 0 0
Purchase of treasury shares 0 0
Repayment of intercompany debt 0 350
Net cash used in financing activities (166) (746)
Effects of exchange rate changes on cash and cash equivalents 54 5
Net increase (decrease) in cash and cash equivalents 28 (2,287)
Cash and cash equivalents, beginning of period 1,476 3,471
Cash and cash equivalents, end of period 1,504 1,184
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0 350
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
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Payments on long-term debt (6,000) (7,000)
Proceeds from Revolving Credit Facility 2,000 7,000
Proceeds from share award plans 463 477
Purchase of treasury shares (51) (161)
Repayment of intercompany debt 3,588 (666)
Net cash used in financing activities 0 (350)
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