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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Dart Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2009 | Jul. 31, 2011 | Feb. 28, 2011 | Dec. 31, 2008
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Cash proceeds | $ 38,000 |  |  |  |  |  |  |  |
Gain (loss) on disposition of business | $ 10,900 |  |  |  |  |  |  |  |
Dividends received from equity investees |  |  | $ 0 | $ 1,000 | $ 0 |  |  |  |
Corporate Joint Venture |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Purchases from related party |  | $ 600 |  | 2,000 | 2,000 |  |  |  |
Dart Helicopter Services LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  | $ 5,000 |
Dart Helicopter Services LLC | Equity Method Investee |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable to related party |  |  |  |  |  | $ 300 |  |  |
Notes receivable interest rate |  |  |  |  |  | 5.00% |  |  |
Dart Helicopter Services LLC | Era DHS LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership |  |  |  |  |  |  |  |  | 49.00%
Dart Holding Company Ltd. |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | 27,100 | $ 2,000 |  |  |  |
Dart Holding Company Ltd. | Equity Method Investee |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable to related party |  |  |  | $ 2,300 |  |  | $ 5,100 |  |

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