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REVENUES - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Liabilities:    
Contract liabilities, net (current) $ 140,808 $ 146,947
Contract liabilities, net (noncurrent) 9,045 8,595
Obtain Contract    
Assets:    
Capitalized costs, net 201,896 194,616
Fulfill Contract    
Assets:    
Capitalized costs, net $ 16,282 $ 12,954