Restructuring Charges and Asset Impairments (Restructuring Charges) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Restructuring Costs
Balance Beginning	$ 12,006	$ 15,449
Expenses, net	9,856	13,343
Cash payments	(15,869)	(18,845)
Balance Ending	$ 5,993	9,947
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	8,748	12,498
Cash payments	(14,714)	(16,362)
Balance Ending	5,971	9,777
Other exit costs
Restructuring Costs
Balance Beginning	69	1,808
Expenses, net	1,108	845
Cash payments	(1,155)	(2,483)
Balance Ending	$ 22	$ 170