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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Non-operating (loss) income, net [Abstract]    
Unrealized Gain (Loss) on Derivatives $ 1,065 $ (7,019)
Interest Income 1,042 259
Other Nonoperating Income (Expense) 1,014 1,205
Nonoperating (loss) Income $ 3,121 $ (5,555)