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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] |  |
Unbilled receivables | $ 114,357 | $ 140,318
Performance obligation | 39,500 |
Receivables (Included in Trade Receivables) |  |
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items] |  |
Unbilled receivables | $ 65,000 | $ 98,200

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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