Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Schedule of Equity Method Investment, Financial Information, Balance Sheets (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Schedule of Equity Method Investment, Financial Information, Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dart Helicopter Services LLC    
Schedule of Equity Method Investments [Line Items]    
Current assets $ 22,507 $ 22,447
Non-current assets 30,776 34,309
Current liabilities 4,225 4,386
Non-current liabilities 8,850 8,907
Other Investments    
Schedule of Equity Method Investments [Line Items]    
Current assets 703 1,151
Non-current assets 5,159 5,899
Current liabilities 597 465
Non-current liabilities $ 3,984 $ 4,298