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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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Assets:      
Foreign currency forward exchange contracts $ 20,121 $ 16,092 $ 3,601
Available-for-sale security 7,150 5,243 8,911
Total assets 27,271 21,335 12,512
Liabilities:      
Foreign currency forward exchange contracts 6,183 2,910 23,538
Level 1      
Assets:      
Foreign currency forward exchange contracts 0 0 0
Available-for-sale security 7,150 5,243 8,911
Total assets 7,150 5,243 8,911
Liabilities:      
Foreign currency forward exchange contracts 0 0 0
Level 2      
Assets:      
Foreign currency forward exchange contracts 20,121 16,092 3,601
Available-for-sale security 0 0 0
Total assets 20,121 16,092 3,601
Liabilities:      
Foreign currency forward exchange contracts 6,183 2,910 23,538
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