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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 |

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