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Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred tax assets, noncurrent $ 31,096 $ 26,449
Accounting Standards Update 2015 17    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Deferred tax assets, current (6,400)  
Deferred tax assets, noncurrent $ 6,400