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Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Receivables [Abstract] |  |
Contract receivables | $ 374,826 | $ 382,096
Other | 2,968 | 5,538
Accounts receivable, gross current | 377,794 | 387,634
Less: allowance for doubtful accounts | (2,441) | (1,696)
Accounts receivable, net | $ 375,353 | $ 385,938

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