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Marketable Securities and Fair Value Measurements - Notional Amounts (Details) - Dec. 31, 2015
€ in Thousands, ¥ in Thousands, HKD in Thousands, AUD in Thousands, $ in Thousands
JPY (¥)
USD ($)
EUR (€)
AUD
HKD
Derivative [Line Items]          
Derivative, Notional Amount   $ 59,766      
US dollar | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount   20,700      
Euro | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount   24,222 € 22,100    
Japanese yen | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount ¥ 583,000 4,839      
Australian dollar | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount   3,426   AUD 4,700  
Hong Kong dollar | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative, Notional Amount   $ 6,579     HKD 51,000