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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 ($)
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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

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