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Summary of Significant Accounting Policies - Fair Value Measurements (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
bank
fund
Dec. 31, 2017
USD ($)
bank
fund
Assets and liabilities carried at fair value measured on a recurring basis    
Concentration Risk, Number of "Triple A" Rated Money Market Funds | fund 0 12
Number of global banks with cash, cash equivalent and restricted cash held on deposit | bank 7 7
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, at Carrying Value   $ 0
Time Deposits, at Carrying Value $ 0 0
Trading securities 10,583 11,279
Foreign Currency Contract, Asset, Fair Value Disclosure   0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Interest Rate Swap 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, at Carrying Value   585,000
Time Deposits, at Carrying Value 5,661 24,482
Trading securities 685 505
Foreign Currency Contract, Asset, Fair Value Disclosure   1,579
Foreign Currency Contracts, Liability, Fair Value Disclosure 365 2,329
Interest Rate Swap 4,183  
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, at Carrying Value   0
Time Deposits, at Carrying Value 0 0
Trading securities 0 0
Foreign Currency Contract, Asset, Fair Value Disclosure   0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Interest Rate Swap 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, at Carrying Value   585,000
Time Deposits, at Carrying Value 5,661 24,482
Trading securities 11,268 11,784
Foreign Currency Contract, Asset, Fair Value Disclosure   1,579
Foreign Currency Contracts, Liability, Fair Value Disclosure 365 $ 2,329
Interest Rate Swap $ 4,183