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REVENUE RECOGNITION - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Revenues | $ (172,832,000) | $ (160,269,000) | $ (485,936,000) | $ (448,087,000) |
Revenue recognized | 0 |  | 0 |  |
Gross receivables from contracts | 79,180,000 |  | 79,180,000 |  | $ 66,227,000
Contract liabilities | 2,674,000 |  | 2,674,000 |  | $ 1,823,000
Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Revenues | $ 1,648,000 |  | $ 4,732,000 |  |

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