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REVENUES - Supplemental balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]    
Contract liabilities, net (current) $ 193,405 $ 146,947
Contract liabilities, net (noncurrent) 35,272 8,595
Obtain Contract    
Disaggregation of Revenue [Line Items]    
Capitalized contract cost 226,945 194,616
Fulfill Contract    
Disaggregation of Revenue [Line Items]    
Capitalized contract cost $ 38,150 $ 12,954