Restructuring, Acquisition, and Integration-Related Costs (Related Costs by Type of Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 33,109	$ 33,582	$ 35,956
Acquisition integration-related costs	2,916	4,722	9,597
Restructuring, acquisition and integration-related costs	36,025	38,304	45,553
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	3,976	4,881	5,779
Acquisition transaction-related costs	2,751	0	9,502
Acquisition integration-related costs	6,188	7,438	13,770
Restructuring, acquisition and integration-related costs	$ 12,915	$ 12,319	$ 29,051