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Summary of Significant Accounting Policies - Schedule of Contract Assets and Contract Liabilities Reported under New Accounting Standard (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Contract receivables, net | $ 230,966 | $ 168,318
Contract assets | 126,688 | 123,197
Contract liabilities | 33,494 | 38,571
Retained earnings | 486,442 | 434,766
ASU 2014-09 | As Reported |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Contract receivables, net |  | 291,515
Contract assets | 126,688 | 123,197
Deferred revenue |  | 38,571
Contract liabilities | $ 33,494 | 38,571
Retained earnings |  | $ 434,766

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