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v3.20.1

Revenues Revenues (Contract Assets and Liabilities) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Movement in Contract Assets and Liabilities [Roll Forward] |
Unbilled revenue, beginning balance | $ 964
Contract liability, beginning balance | 5,328
Unbilled revenue, ending balance | 3,937
Contract liability, ending balance | 4,561
Increase in unbilled revenue | 2,973
Increase in accrued customer advances | $ (767)

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