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Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Assets: |  |  |
Foreign currency forward exchange contracts | $ 10,780 | $ 7,804 | $ 8,706
Available-for-sale security | 6,201 | 8,991 | 11,201
Total assets | 16,981 | 16,795 | 19,907
Liabilities: |  |  |
Foreign currency forward exchange contracts | 7,360 | 19,320 | 26,618
Level 1 |  |  |
Assets: |  |  |
Foreign currency forward exchange contracts | 0 | 0 | 0
Available-for-sale security | 6,201 | 8,991 | 11,201
Total assets | 6,201 | 8,991 | 11,201
Liabilities: |  |  |
Foreign currency forward exchange contracts | 0 | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Foreign currency forward exchange contracts | 10,780 | 7,804 | 8,706
Available-for-sale security | 0 | 0 | 0
Total assets | 10,780 | 7,804 | 8,706
Liabilities: |  |  |
Foreign currency forward exchange contracts | 7,360 | 19,320 | 26,618
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 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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