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Significant Accounting Policies - Intangible Assets Other Than Goodwill and Foreign Currency (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Foreign currency      
Currency translation adjustments $ 18,898 $ 7,874 $ 1,450
Minimum      
Intangible assets other than goodwill      
Estimated useful lives of intangible assets 2 years    
Maximum      
Intangible assets other than goodwill      
Estimated useful lives of intangible assets 5 years