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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)