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Contract Receivables, Net - Summary of Contract Receivables, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Receivables [Abstract] |  |
Billed and billable | $ 235,431 | $ 264,682
Allowance for doubtful accounts | (5,154) | (3,506)
Contract receivables, net | $ 230,277 | $ 261,176

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