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 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ (1,030) $ 4,253  
Cash flows from investing activities:      
Purchases of property and equipment (3,784) (1,005)  
Proceeds from disposition of property and equipment 19,497 126  
Return of helicopter deposits   (114)  
Investments in and advances to equity investees 0 (114)  
Principal payments on notes due from equity investees 54 185  
Principal payments on third party notes receivable 76 56  
Net cash provided by (used in) investing activities 15,843 (752)  
Cash flows from financing activities:      
Payments on long-term debt (14,259) (6,581)  
Proceeds from issuance of long-term debt 0    
Proceeds from issuance of long-term debt (14,259) (6,581)  
Proceeds from Revolving Credit Facility 0 2,000  
Revolving Credit Facility issuance costs (1,295)   $ (1,300)
Extinguishment of long-term debt 0 0  
Proceeds from share award plans 484 463  
Purchase of treasury shares 0 (51)  
Tax expense on vested restricted stock 0    
Borrowings and repayments of intercompany debt 0 0  
Net cash used in financing activities (15,070) (4,169)  
Effects of exchange rate changes on cash and cash equivalents (23) 57  
Net increase (decrease) in cash and cash equivalents (280) (611)  
Cash, cash equivalents and restricted cash, beginning of period 16,833 30,727  
Cash, cash equivalents and restricted cash, end of period 16,553 30,116 30,727
Reportable Legal Entities | Parent      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 3,387 (639)  
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 issuance of long-term debt 0    
Proceeds from Revolving Credit Facility 0 0  
Revolving Credit Facility issuance costs 0    
Extinguishment of long-term debt 0 0  
Proceeds from share award plans 0 0  
Purchase of treasury shares 0 0  
Tax expense on vested restricted stock 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 8 0  
Net increase (decrease) in cash and cash equivalents 3,395 (639)  
Cash, cash equivalents and restricted cash, beginning of period 10,800 25,474  
Cash, cash equivalents and restricted cash, end of period 14,195 24,835 25,474
Reportable Legal Entities | Guarantors      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (5,761) 4,718  
Cash flows from investing activities:      
Purchases of property and equipment (3,746) (971)  
Proceeds from disposition of property and equipment 19,497 126  
Return of helicopter deposits   (114)  
Investments in and advances to equity investees 0    
Principal payments on notes due from equity investees 54 185  
Principal payments on third party notes receivable 76 56  
Net cash provided by (used in) investing activities 15,881 (718)  
Cash flows from financing activities:      
Payments on long-term debt (554) (415)  
Proceeds from issuance of long-term debt 0    
Proceeds from Revolving Credit Facility 0 0  
Revolving Credit Facility issuance costs 0    
Extinguishment of long-term debt 0 0  
Proceeds from share award plans 0 0  
Purchase of treasury shares 0 0  
Tax expense on vested restricted stock 0    
Borrowings and repayments of intercompany debt (12,811) (3,588)  
Net cash used in financing activities (13,365) (4,003)  
Effects of exchange rate changes on cash and cash equivalents (5) 3  
Net increase (decrease) in cash and cash equivalents (3,250) 0  
Cash, cash equivalents and restricted cash, beginning of period 3,250 3,777  
Cash, cash equivalents and restricted cash, end of period 0 3,777 3,777
Reportable Legal Entities | Non-guarantors      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 1,344 174  
Cash flows from investing activities:      
Purchases of property and equipment (38) (34)  
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 (38) (34)  
Cash flows from financing activities:      
Payments on long-term debt (1,705) (166)  
Proceeds from issuance of long-term debt 0    
Proceeds from Revolving Credit Facility 0 0  
Revolving Credit Facility issuance costs 0    
Extinguishment of long-term debt 0 0  
Proceeds from share award plans 0 0  
Purchase of treasury shares 0 0  
Tax expense on vested restricted stock 0    
Borrowings and repayments of intercompany debt 0 0  
Net cash used in financing activities (1,705) (166)  
Effects of exchange rate changes on cash and cash equivalents (26) 54  
Net increase (decrease) in cash and cash equivalents (425) 28  
Cash, cash equivalents and restricted cash, beginning of period 2,783 1,476  
Cash, cash equivalents and restricted cash, end of period 2,358 1,504 1,476
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  
Net cash provided by (used in) investing activities 0 0  
Cash flows from financing activities:      
Payments on long-term debt (12,000) (6,000)  
Proceeds from issuance of long-term debt 0    
Proceeds from Revolving Credit Facility 0 2,000  
Revolving Credit Facility issuance costs (1,295)    
Extinguishment of long-term debt 0 0  
Proceeds from share award plans 484 463  
Purchase of treasury shares 0 (51)  
Tax expense on vested restricted stock 0    
Borrowings and repayments of intercompany debt 12,811 3,588  
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, cash equivalents and restricted cash, beginning of period 0 0  
Cash, cash equivalents and restricted cash, end of period $ 0 $ 0 $ 0