Restructuring Charges and Asset Impairments (Restructuring Charges) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Restructuring Costs
Balance Beginning	$ 12,006	$ 15,449
Expenses, net	6,903	7,808
Cash payments	(11,365)	(13,005)
Balance Ending	$ 7,544	10,252
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	6,357	7,101
Cash payments	(10,772)	(10,786)
Balance Ending	7,522	9,956
Other exit costs
Restructuring Costs
Balance Beginning	69	1,808
Expenses, net	546	707
Cash payments	(593)	(2,219)
Balance Ending	$ 22	$ 296