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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Excess tax benefit $ 3,488 $ 7,169  
Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred tax effect     $ 1,453
Accounting Standards Update 2016-09 | Additional Paid-in Capital      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment     5,999
Accounting Standards Update 2016-09 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment     $ 4,546