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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Foreign Currency Cash Flow Hedges    
Maximum Length of Time Hedged in Foreign Currency Cash Flow Hedge 6 months  
Fair value measured on recurring basis | Quoted prices in active markets (Level 1)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money market funds   $ 0
Time deposits $ 0 0
Trading securities 10,086 12,428
Foreign Currency Contract, Asset, Fair Value Disclosure 0  
Derivative liabilities   0
Fair value measured on recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money market funds   36,828
Time deposits 20,802 16,204
Trading securities 874 744
Foreign Currency Contract, Asset, Fair Value Disclosure 6,362  
Derivative liabilities   2,411
Fair value measured on recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities carried at fair value measured on a recurring basis    
Money market funds   0
Time deposits 0 0
Trading securities 0 0
Foreign Currency Contract, Asset, Fair Value Disclosure 0  
Derivative liabilities   0
Estimate of Fair Value Measurement [Member] | Fair value measured on recurring basis    
Assets and liabilities carried at fair value measured on a recurring basis    
Money market funds   36,828
Time deposits 20,802 16,204
Trading securities 10,960 13,172
Foreign Currency Contract, Asset, Fair Value Disclosure $ 6,362  
Derivative liabilities   $ 2,411