Restructuring Charges and Asset Impairments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve
Balance at	$ 28,657	$ 47,422
Expenses, net	55,867	46,165
Cash payments	(40,804)	(64,930)	$ (62,086)
Balance at	$ 43,720	28,657	47,422
Restructuring reserve, payment period	24 months
Asset impairment charges	$ 4,000
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	$ 28,376	43,700
Expenses, net	53,322	44,510
Cash payments	(39,547)	(59,834)
Balance at	42,151	28,376	43,700
Other exit costs
Restructuring Reserve
Balance at	281	3,722
Expenses, net	2,545	1,655
Cash payments	(1,257)	(5,096)
Balance at	$ 1,569	281	$ 3,722
Facility closing
Restructuring Reserve
Asset impairment charges		5,000
Loss on sale of facility		$ 5,000