Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 285,377	$ 252,586
Cost of sales	222,177	204,995
Gross profit	63,200	47,591
Selling, general and administrative expenses	37,154	32,860
Executive succession	0	1,143
Operating profit	26,046	13,588
Interest expense, net	120	118
Income before income taxes	25,926	13,470
Provision for income taxes	9,762	5,098
Net income	$ 16,164	$ 8,372
Net income per common share:
Basic (in usd per share)	$ 0.68	$ 0.36
Diluted (in usd per share)	$ 0.67	$ 0.36
Weighted average common shares outstanding:
Basic (in shares)	23,774	23,017
Diluted (in shares)	24,188	23,455