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REVENUE RECOGNITION - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | $ 147,455,000 | $ 133,802,000 |
Revenue recognized | 0 |  |
Gross receivables from contracts | 66,429 |  | $ 66,227
Contract liabilities | 2,567,000 |  | $ 1,823,000
Adjustments | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenues | $ (1,468,000) |  |

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