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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Assets
Available-for-sale security	$ 3,823	$ 3,530	$ 3,284
Total assets	12,396	18,532	30,922
Level 1
Assets
Available-for-sale security	3,823	3,530	3,284
Total assets	3,823	3,530	3,284
Level 2
Assets
Available-for-sale security	0	0	0
Total assets	8,573	15,002	27,638
Level 3
Assets
Available-for-sale security	0	0	0
Total assets	0	0	0
Foreign currency forward exchange contracts and other
Assets
Foreign currency forward exchange contracts and other	8,573	15,002	27,638
Liabilities
Foreign currency forward exchange contracts and other	13,941	2,976	3,210
Foreign currency forward exchange contracts and other | Level 1
Assets
Foreign currency forward exchange contracts and other	0	0	0
Liabilities
Foreign currency forward exchange contracts and other	0	0	0
Foreign currency forward exchange contracts and other | Level 2
Assets
Foreign currency forward exchange contracts and other	8,573	15,002	27,638
Liabilities
Foreign currency forward exchange contracts and other	13,941	2,976	3,210
Foreign currency forward exchange contracts and other | Level 3
Assets
Foreign currency forward exchange contracts and other	0	0	0
Liabilities
Foreign currency forward exchange contracts and other	$ 0	$ 0	$ 0

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- Definition

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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