Quarterly report pursuant to Section 13 or 15(d)

Other income (expense), net (Details)

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Other income (expense), net (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other income (expense), net        
Foreign exchange (losses) gains $ (14,022,000) $ 3,289,000 $ (5,605,000) $ 3,718,000
Losses on redemption or maturity of available-for-sale debt securities (1,310,000)   (2,473,000)  
Other (74,000) (65,000) (198,000) (64,000)
Other income (expense), net $ (15,406,000) $ 3,224,000 $ (8,276,000) $ 3,654,000