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Fair Value of Financial Instruments Additional Information (Details) - Forward contracts - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]          
Derivative, notional amount $ 531,000   $ 531,000   $ 357,400
Other accounts receivable          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, asset 142   142   0
Accrued expenses          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, liabilities 0   0   $ 4,954
Other expenses, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Recognized (losses) gains of foreign currency forward contracts $ (203) $ 803 (13,034) $ 9,010  
Other, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Change in the fair value of foreign currency forward contracts     13,000 (9,000)  
Cash settlements     $ (18,100)    
Cash receipts       $ 8,900