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) - Dart Helicopter Services LLC
$ in Thousands
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]  
Current assets $ 31,332
Non-current assets 30,613
Current liabilities 7,007
Non-current liabilities $ 5,558