Restructuring Charges and Asset Impairments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve
Balance at	$ 43,720	$ 28,515
Expenses, net	25,637	52,659
Cash payments	(52,974)	(37,454)	$ (62,071)
Balance at	$ 16,383	43,720	28,515
Restructuring reserve, payment period	24 months
Asset impairment charges	$ 2,000	4,000	15,000
Minimum
Restructuring Reserve
Restructuring reserve, payment period	12 months
Maximum
Restructuring Reserve
Restructuring reserve, payment period	24 months
Severance and benefits costs
Restructuring Reserve
Balance at	$ 42,151	28,234
Expenses, net	19,130	50,114
Cash payments	(47,640)	(36,197)
Balance at	13,641	42,151	28,234
Other exit costs
Restructuring Reserve
Balance at	1,569	281
Expenses, net	6,507	2,545
Cash payments	(5,334)	(1,257)
Balance at	$ 2,742	$ 1,569	$ 281