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REVENUE Revenue from Contract with Customer (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost [Line Items]    
Contract with Customer, Asset, Net $ 18,677 $ 16,513
Contract with Customer, Asset, Net, Noncurrent 0  
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress 7,086  
Contract with Customer, Asset, Reclassified to Receivable (4,922)  
Contract with Customer, Asset, Net, Current $ 18,677