Non-operating income, net Non-Operating income, net (Components of Non-operating income, net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-operating (loss) income, net [Abstract]
Investment Income, Interest and Dividend	$ 26,596	$ 26,490	$ 17,944
income from transition services	15,600	1,132	0
Gain (Loss) on Disposition of Business	817	54,840	10,421
Loss on Extinguishment of Debt	0	6,554	0
Other Nonoperating Income (Expense)	247	1,061	(739)
Nonoperating Income (Expense)	$ 43,260	$ 76,969	$ 27,626