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Non-operating (loss) income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Non-operating (loss) income, net [Abstract]        
Unrealized Gain (Loss) on Derivatives $ 1,440 $ (4,747) $ 2,411 $ (9,058)
Interest Income 1,728 639 4,292 1,271
Other Nonoperating Income (Expense) 94 133 1,389 1,458
Nonoperating (loss) Income $ 3,262 $ (3,975) $ 8,092 $ (6,329)