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Accounts Receivable, Net - Schedule of Accounts Receivables Net (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Receivables [Abstract] |  |  |
Trade accounts receivable | $ 213,251 | $ 167,575 |
Unbilled revenue, at net realizable value | 93,950 | 63,494 |
Total accounts receivable | 307,201 | 231,069 |
Allowance for doubtful accounts | (14,705) | (14,894) | $ (14,379)
Accounts receivable, net | $ 292,496 | $ 216,175 |

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