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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era Training Center Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) simulator | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from sale | $ 34,712 | $ 1,000 |
Equity Method Investee | Training Services |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Notes Receivable, Principal, Related Parties |  | 3,600 |
Notes receivable to related party |  | $ 3,700 |
Number of flight simulators sold | simulator |  | 3 |
Proceeds from sale |  | $ 2,900 |
Equity Method Investee | Additional Simulator |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Notes receivable to related party |  | 400 |
Payments for purchase of other assets |  | 400 |
Era Training Center | Equity Method Investee | Helicopter, Management and Other Services |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Expenses from transactions with related party |  | 100 | $ 200
Era Training Center | Equity Method Investee | Training Services |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Expenses from transactions with related party |  | $ 200 | $ 500

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