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Other income, net (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Other income, net |  |
Realized foreign exchange gains | $ 295 |
Unrealized foreign exchange gains | 5,095 | $ 7,862
Losses on redemption or maturity of available-for-sale debt securities | 0 | (1,163)
Other | 40 | 431
Other income, net | $ 5,430 | $ 7,130

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