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Non-operating income, net Non-Operating income, net (Components of Non-operating income, net) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Non-operating (loss) income, net [Abstract]      
Available-for-sale Securities, Gross Realized Gain (Loss) $ 185 $ (5) $ 18,861
Unrealized Gain (Loss) on Derivatives (14,130) 2,249 (17,801)
Investment Income, Interest and Dividend 2,128 922 1,897
Other Nonoperating Income (Expense) 1,152 1,712 343
Nonoperating Income (Expense) $ (10,665) $ 4,878 $ 3,300