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Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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

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