Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 1,592,828	$ 1,477,534	$ 1,299,932
Cost of sales	1,150,855	1,064,962	946,795
Gross profit	441,973	412,572	353,137
Selling, general and administrative expenses	349,030	324,722	289,019
Goodwill impairment	0	0	6,371
Net (gain)/loss on sale of assets	105	269	(448)
Operating income from continuing operations	92,838	87,581	58,195
Interest expense, net	12,185	11,646	3,403
Other (income) expense, net	(175)	(339)	(1,075)
Earnings from continuing operations before income taxes	80,828	76,274	55,867
Income tax expense	26,900	26,346	20,386
Earnings from continuing operations	53,928	49,928	35,481
Earnings (loss) from discontinued operations, net of taxes	(226)	1,214	130
Gain on disposal of discontinued operations, net of taxes	1,323	0	0
Total earnings from discontinued operations, net of taxes	1,097	1,214	130
Net earnings	$ 55,025	$ 51,142	$ 35,611
Earnings per share:
Basic earnings per share from continuing operations	$ 2.04	$ 1.90	$ 1.37
Basic earnings per share from discontinued operations	$ (0.01)	$ 0.05	$ 0.00
Basic earnings per share from disposal of discontinued operations	$ 0.05	$ 0.00	$ 0.00
Basic earnings per share	$ 2.08	$ 1.95	$ 1.37
Diluted earnings per share from continuing operations	$ 2.03	$ 1.88	$ 1.36
Diluted earnings per share from discontinued operations	$ (0.01)	$ 0.05	$ 0.00
Diluted earnings per share from disposal of discontinued operations	$ 0.05	$ 0.00	$ 0.00
Diluted earnings per share	$ 2.07	$ 1.93	$ 1.36
Average shares outstanding:
Basic	26,425	26,246	25,928
Diluted	26,622	26,500	26,104
Dividends declared per share	$ 0.64	$ 0.60	$ 0.56