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Accounts Receivable and Allowance for Expected Credit Losses - Accounts Receivable, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts receivable: |  |
Billed receivables | $ 513,459 | $ 482,333
Unbilled receivables | 236,285 | 246,205
Allowance for expected credit losses | (38,387) | (35,166)
Accounts receivable, net | $ 711,357 | $ 693,372

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