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Other income, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other income, net    
Unrealized foreign exchange gains $ 7,862 $ 52
Losses on redemption or maturity of available-for-sale debt securities (1,163)  
Other 431 378
Other income, net $ 7,130 $ 430