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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Non-operating (loss) income, net [Abstract]    
Unrealized Gain (Loss) on Derivatives $ (893) $ 1,065
Interest Income 2,245 1,042
Other Nonoperating Income (Expense) (51) 1,014
Nonoperating (loss) Income $ 1,301 $ 3,121