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REVENUES - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Liabilities:    
Contract liabilities, net (current) $ 195,472 $ 146,947
Contract liabilities, net (noncurrent) 28,039 8,595
Obtain Contract    
Assets:    
Capitalized costs, net 216,540 194,616
Fulfill Contract    
Assets:    
Capitalized costs, net $ 24,114 $ 12,954