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Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Contract receivables $ 382,096 $ 385,744
Other 5,538 6,099
Accounts receivable, gross current 387,634 391,843
Less: allowance for doubtful accounts (1,696) (3,364)
Accounts receivable, net $ 385,938 $ 388,479