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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-operating (loss) income, net [Abstract]      
Investment Income, Interest and Dividend $ 17,944 $ 6,191 $ 2,128
Gain (Loss) on Disposition of Business 10,421 0 0
Unrealized Gain (Loss) on Derivatives (893) 2,402 (14,130)
Other Nonoperating Income (Expense) 154 1,572 1,337
Nonoperating Income (Expense) $ 27,626 $ 10,165 $ (10,665)