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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Non-operating (loss) income, net [Abstract]    
Interest Income $ 7,489 $ 2,245
Other Nonoperating Income (Expense) 315 (944)
Nonoperating (loss) Income $ 7,804 $ 1,301