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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, 2018
Dec. 31, 2017
Mar. 31, 2017
Assets:      
Foreign currency forward exchange contracts $ 3,601 $ 7,804 $ 17,184
Available-for-sale security 8,911 8,991 13,624
Total assets 12,512 16,795 30,808
Liabilities:      
Foreign currency forward exchange contracts 23,538 19,320 15,185
Level 1      
Assets:      
Foreign currency forward exchange contracts 0 0 0
Available-for-sale security 8,911 8,991 13,624
Total assets 8,911 8,991 13,624
Liabilities:      
Foreign currency forward exchange contracts 0 0 0
Level 2      
Assets:      
Foreign currency forward exchange contracts 3,601 7,804 17,184
Available-for-sale security 0 0 0
Total assets 3,601 7,804 17,184
Liabilities:      
Foreign currency forward exchange contracts 23,538 19,320 15,185
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