Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale securities:
Available-for-sale securities	$ 981,602	$ 1,077,344
Time deposits
Available-for-sale securities:
Available-for-sale securities	630,000	460,000
Money market funds
Available-for-sale securities:
Available-for-sale securities	125,253	284,172
Recurring
Available-for-sale securities:
Totals	755,569	746,680
Liabilities:
Totals	10,110	1,697
Recurring \| Time deposits
Available-for-sale securities:
Available-for-sale securities	630,000	460,000
Recurring \| Money market funds
Available-for-sale securities:
Available-for-sale securities	125,253	284,172
Recurring \| Interest rate contracts
Liabilities:
Derivative liabilities	6,155	1,515
Recurring \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	316	2,508
Liabilities:
Derivative liabilities	3,955	182
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale securities:
Totals	125,253	284,172
Liabilities:
Totals	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Time deposits
Available-for-sale securities:
Available-for-sale securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Available-for-sale securities:
Available-for-sale securities	125,253	284,172
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate contracts
Liabilities:
Derivative liabilities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	0	0
Liabilities:
Derivative liabilities	0	0
Recurring \| Significant Other Observable Inputs (Level 2)
Available-for-sale securities:
Totals	630,316	462,508
Liabilities:
Totals	10,110	1,697
Recurring \| Significant Other Observable Inputs (Level 2) \| Time deposits
Available-for-sale securities:
Available-for-sale securities	630,000	460,000
Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Available-for-sale securities:
Available-for-sale securities	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Interest rate contracts
Liabilities:
Derivative liabilities	6,155	1,515
Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	316	2,508
Liabilities:
Derivative liabilities	$ 3,955	$ 182

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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