Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements Of Income [Abstract]
Net sales	$ 252,586	$ 223,552
Cost of sales	204,995	178,729
Gross profit	47,591	44,823
Selling, general and administrative expenses	32,860	27,450
Executive succession	1,143
Operating profit	13,588	17,373
Interest expense, net	118	74
Income before income taxes	13,470	17,299
Provision for income taxes	5,098	6,183
Net income	$ 8,372	$ 11,116
Net income per common share:
Basic	$ 0.36	$ 0.50
Diluted	$ 0.36	$ 0.49
Weighted average common shares outstanding:
Basic	23,017	22,442
Diluted	23,455	22,642