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REVENUE RECOGNITION - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Revenues $ (163,664,000) $ (147,455,000)  
Revenue recognized 0    
Gross receivables from contracts 70,722,000   $ 73,500,000
Contract liabilities 2,315,000   $ 3,074,000
Adjustments | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Revenues $ 1,338,000 $ 1,468,000