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REVENUES - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Liabilities:    
Contract liabilities, net (current) $ 218,585 $ 217,938
Contract liabilities, net (noncurrent) 46,290 52,944
Obtain Contract    
Assets:    
Capitalized costs, net 278,565 253,780
Fulfill Contract    
Assets:    
Capitalized costs, net $ 106,236 $ 81,371