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REVENUE Revenue from Contract with Customer (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Capitalized Contract Cost [Line Items]    
Contract with Customer, Asset, Net $ 18,545 $ 6,579
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress 20,099  
Contract with Customer, Asset, Reclassified to Receivable (8,133)  
Contract with Customer, Asset, Net, Noncurrent 1,398  
Contract with Customer, Asset, Net, Current $ 17,147