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Accounts Receivable, Net - Schedule of Accounts Receivables Net (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Receivables [Abstract] |  |  |  |
Trade accounts receivable | $ 190,710 | $ 167,575 |  |
Unbilled revenue, at net realizable value | 67,616 | 63,494 |  |
Total accounts receivable | 258,326 | 231,069 |  |
Allowance for doubtful accounts | (16,158) | (14,894) | $ (14,379) | $ (13,389)
Accounts receivable, net | $ 242,168 | $ 216,175 |  |

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