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Other (expense) income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other (expense) income      
Foreign exchange gain (loss) $ (602) $ 232 $ 717
Gain on available-for-sale securities 77 429 859
Other income (expense) (28) 199 447
Other Nonoperating Income (Expense), Total $ (553) $ 860 $ 2,023