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Other income (expense), net (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other income (expense), net |  |  |  |
Realized foreign exchange (losses) gains | $ (179,000) | $ 191,000 | $ (2,869,000) | $ 703,000
Unrealized foreign exchange (losses) gains | (2,006,000) | 3,680,000 | (4,921,000) | 6,886,000
Losses on redemption or maturity of available-for-sale debt securities | 0 |  | (2,473,000) |
Other | (64,000) | (269,000) | (262,000) | (348,000)
Other income (expense), net | $ (2,249,000) | $ 3,602,000 | $ (10,525,000) | $ 7,242,000

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