Exit Activity Costs and Asset Impairments (Summary of Exit Activity Costs and Asset Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	$ 3,002	$ 1,698
Cost of sales
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	994	1,118
Selling, general, and administrative expense
Restructuring Cost and Reserve [Line Items]
Net asset impairment and exit activity charges (gains)	$ 2,008	$ 580