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Contract Assets and Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables	$ 43,688		$ 28,153
Advanced billings	126,387		$ 73,756
ASC 606
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		$ 37,906
Advanced billings		119,451
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		9,753
Advanced billings	$ (40,356)	$ 45,695

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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