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Contracts with Customers - Summary of Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Revenue From Contract With Customer [Abstract]    
Billed $ 544,444 $ 475,528
Unbilled 220,278 201,461
Total accounts receivable, gross 764,722 676,989
Allowance for doubtful accounts (6,497) (5,497)
Total accounts receivable, net $ 758,225 $ 671,492