Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements Of Income [Abstract]
Sales	$ 549,225	$ 620,925
Cost of sales	498,915	569,146
Gross profit	50,310	51,779
Selling, general and administrative expenses	31,253	28,202
Restructuring charges and other costs	2,789	4,869
Income from operations	16,268	18,708
Interest expense	(2,334)	(435)
Interest income	264	432
Other expense, net	(223)	(1,057)
Income before income taxes	13,975	17,648
Income tax expense	2,923	3,443
Net income	$ 11,052	$ 14,205
Earnings per share:
Basic	$ 0.22	$ 0.27
Diluted	$ 0.22	$ 0.27
Weighted-average number of shares outstanding:
Basic	49,848	52,463
Diluted	50,287	53,045