Restructuring Charges and Asset Impairments (Restructuring Charges) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restructuring Costs
Balance Beginning	$ 15,449	$ 43,720
Expenses, net	13,343	18,771
Cash payments	(18,845)	(39,242)
Balance Ending	$ 9,947	23,249
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	$ 13,641	42,151
Expenses, net	12,498	13,637
Cash payments	(16,362)	(37,492)
Balance Ending	9,777	18,296
Other exit costs
Restructuring Costs
Balance Beginning	1,808	1,569
Expenses, net	845	5,134
Cash payments	(2,483)	(1,750)
Balance Ending	$ 170	$ 4,953