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Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Assets: |  |  |
Foreign currency forward exchange contracts | $ 9,776 | $ 7,804 | $ 4,084
Available-for-sale security | 6,657 | 8,991 | 7,354
Total assets | 16,433 | 16,795 | 11,438
Liabilities: |  |  |
Foreign currency forward exchange contracts | 9,792 | 19,320 | 29,877
Level 1 |  |  |
Assets: |  |  |
Foreign currency forward exchange contracts | 0 | 0 | 0
Available-for-sale security | 6,657 | 8,991 | 7,354
Total assets | 6,657 | 8,991 | 7,354
Liabilities: |  |  |
Foreign currency forward exchange contracts | 0 | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Foreign currency forward exchange contracts | 9,776 | 7,804 | 4,084
Available-for-sale security | 0 | 0 | 0
Total assets | 9,776 | 7,804 | 4,084
Liabilities: |  |  |
Foreign currency forward exchange contracts | 9,792 | 19,320 | 29,877
Level 3 |  |  |
Assets: |  |  |
Foreign currency forward exchange contracts | 0 | 0 | 0
Available-for-sale security | 0 | 0 | 0
Total assets | 0 | 0 | 0
Liabilities: |  |  |
Foreign currency forward exchange contracts | $ 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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