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Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Assets      
Foreign currency forward exchange contracts $ 27,638 $ 16,092 $ 9,776
Available-for-sale security 3,284 5,243 6,657
Total assets 30,922 21,335 16,433
Liabilities      
Foreign currency forward exchange contracts 3,210 2,910 9,792
Level 1      
Assets      
Foreign currency forward exchange contracts 0 0 0
Available-for-sale security 3,284 5,243 6,657
Total assets 3,284 5,243 6,657
Liabilities      
Foreign currency forward exchange contracts 0 0 0
Level 2      
Assets      
Foreign currency forward exchange contracts 27,638 16,092 9,776
Available-for-sale security 0 0 0
Total assets 27,638 16,092 9,776
Liabilities      
Foreign currency forward exchange contracts 3,210 2,910 9,792
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