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Revenue - Receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 335,803 | $ 313,719
Unbilled receivables | 12,080 | 14,492
Billed receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total customer receivables | $ 323,723 | $ 299,227

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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