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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ (174,724) | $ (172,832) | $ (165,649) | $ (147,455) | $ (151,222) | $ (160,269) | $ (154,016) | $ (133,802) | $ (660,660) | $ (599,309) | $ (565,030)
Gross receivables from contracts | 73,500 |  |  |  | 66,227 |  |  |  | 73,500 | 66,227 |
Contract liabilities | $ 3,074 |  |  |  | $ 1,823 |  |  |  | 3,074 | $ 1,823 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 6,279 |  |

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