Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Income Statement [Abstract]
Net sales	$ 462,332	$ 423,663	$ 1,335,353	$ 1,243,463
Cost of sales	332,827	304,806	961,653	893,083
Gross profit	129,505	118,857	373,700	350,380
Selling, general and administrative expenses	103,502	87,436	298,853	274,075
Net loss on sale of assets	47	0	215	100
Operating income	25,956	31,421	74,632	76,205
Interest expense, net	3,444	3,113	10,060	9,344
Other expense (income), net	252	(21)	541	368
Earnings from continuing operations before income taxes	22,260	28,329	64,031	66,493
Income tax expense	7,387	9,634	21,507	22,752
Earnings from continuing operations	14,873	18,695	42,524	43,741
Earnings from discontinued operations, net of tax	(94)	64	285	64
Gain on disposal of discontinued operations, net of taxes	0	420	0	420
Earnings from discontinued operations, net of taxes	(94)	484	285	484
Net earnings	$ 14,779	$ 19,179	$ 42,809	$ 44,225
Earnings per share:
Basic earnings per share from continuing operations	$ 0.55	$ 0.70	$ 1.57	$ 1.64
Basic earnings per share from discontinued operations	$ 0.00	$ 0.00	$ 0.01	$ 0.00
Basic earnings per share from disposal of discontinued operations	$ 0.00	$ 0.02	$ 0.00	$ 0.02
Basic earnings per share	$ 0.55	$ 0.72	$ 1.58	$ 1.66
Diluted earnings per share from continuing operations	$ 0.53	$ 0.68	$ 1.53	$ 1.61
Diluted earnings per share from discontinued operations	$ 0.00	$ 0.00	$ 0.01	$ 0.00
Diluted earnings per share from disposal of discontinued operations	$ 0.00	$ 0.02	$ 0.00	$ 0.02
Diluted earnings per share	$ 0.53	$ 0.70	$ 1.54	$ 1.63
Average shares outstanding:
Basic (in shares)	27,113	26,770	27,025	26,721
Diluted (in shares)	27,862	27,233	27,766	27,062
Dividends declared per share	$ 0.16	$ 0.16	$ 0.48	$ 0.48