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Revenue - Summary of Total Receivables, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Billed receivables $ 147,247 $ 179,177
Allowance for doubtful accounts (2,544) (3,912)
Billed receivables, net 144,703 175,265
Current accrued receivables, net 154,633 167,614
Long-term accrued receivables, net 196,676 215,772
Total accrued receivables, net 351,309 383,386
Total receivables, net $ 496,012 $ 558,651