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Summary of Significant Accounting Policies - Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss consists of foreign currency translation adjustments, net of tax $ 49,646 $ 38,030  
Net unrealized losses on available-for-sale investments, net of tax 1,413 130  
Losses on currency swaps, net of gains on long-term intercompany loans 1,271 1,271  
Net realized gains reclassified into current operations 344 673 $ 314
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net realized gains reclassified into current operations 344 673 314
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net unrealized gains on derivative instruments $ (206) $ (32) $ (104)