Non-operating income, net Non-Operating income, net (Components of Non-operating income, net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Non-operating (loss) income, net [Abstract]
Unrealized Gain (Loss) on Derivatives	$ 2,402	$ (14,130)	$ 2,249
Investment Income, Interest and Dividend	6,191	2,128	922
Other Nonoperating Income (Expense)	1,572	1,337	1,707
Nonoperating Income (Expense)	$ 10,165	$ (10,665)	$ 4,878