Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Income Statement [Abstract]
Net sales	$ 446,324	$ 453,018	$ 889,106	$ 860,976
Cost of sales	314,372	324,469	629,243	618,427
Gross profit	131,952	128,549	259,863	242,549
Selling, general and administrative expenses	101,953	100,048	207,507	192,350
Net (gain) / loss on sale of assets	(432)	59	(405)	173
Operating income	30,431	28,442	52,761	50,026
Interest expense, net	3,222	3,373	6,549	6,504
Other expense (income), net	(1)	240	(65)	320
Earnings from continuing operations before income taxes	27,210	24,829	46,277	43,202
Income tax expense	5,519	8,120	11,837	14,549
Earnings from continuing operations	21,691	16,709	34,440	28,653
Losses from discontinued operations, net of tax	0	(515)	0	(1,002)
Gain on disposal of discontinued operations, net of taxes	0	379	0	379
Net earnings	$ 21,691	$ 16,573	$ 34,440	$ 28,030
Earnings per share:
Basic earnings per share from continuing operations	$ 0.80	$ 0.62	$ 1.27	$ 1.07
Basic loss per share from discontinued operations	0.00	(0.02)	0.00	(0.04)
Basic earnings per share from disposal of discontinued operations	0.00	0.01	0.00	0.01
Basic earnings per share	0.80	0.61	1.27	1.04
Diluted earnings per share from continuing operations	0.77	0.61	1.23	1.04
Diluted loss per share from discontinued operations	0.00	(0.02)	0.00	(0.04)
Diluted earnings per share from disposal of discontinued operations	0.00	0.01	0.00	0.01
Diluted earnings per share	$ 0.77	$ 0.60	$ 1.23	$ 1.01
Average shares outstanding:
Basic	27,240	27,039	27,214	26,981
Diluted	28,098	27,844	27,988	27,717
Dividends declared per share	$ 0.18	$ 0.16	$ 0.36	$ 0.32