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Revenue - Receivables (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 367,194 | $ 288,288
Unbilled receivables | 14,956 | 14,752
Billed receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 352,238 | $ 273,536

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