Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Costs
Balance Beginning	$ 12,006	$ 15,449
Expenses, net	3,054	3,700
Cash payments	(6,047)	(8,246)
Balance Ending	$ 9,013	10,903
Minimum
Restructuring Costs
Restructuring reserve, expected payment period	12 months
Maximum
Restructuring Costs
Restructuring reserve, expected payment period	24 months
Severance and benefits costs
Restructuring Costs
Balance Beginning	$ 11,937	13,641
Expenses, net	2,979	3,432
Cash payments	(5,933)	(7,293)
Balance Ending	8,983	9,780
Other exit costs
Restructuring Costs
Balance Beginning	69	1,808
Expenses, net	75	268
Cash payments	(114)	(953)
Balance Ending	$ 30	$ 1,123