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Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Billed and billable $ 229,327 $ 264,682
Allowance for doubtful accounts (4,948) (3,506)
Contract receivables, net $ 224,379 $ 261,176