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Revenue - Receivables (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 272,387 | $ 298,118
Unbilled receivables | 11,139 | 11,922
Billed receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 261,248 | $ 286,196

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