Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Revenues	$ 178,647	$ 178,799	$ 507,702	$ 484,076
Costs and expenses:
Operating	114,103	116,157	330,459	323,229
Selling	28,618	28,103	81,218	76,774
General and administrative	11,558	11,315	35,636	33,322
Depreciation and amortization	9,935	10,037	29,062	29,461
Gain on sale of assets, net	(219)	(155)	(1,103)	(399)
Total costs and expenses	163,995	165,457	475,272	462,387
Income from operations	14,652	13,342	32,430	21,689
Other income (expense):
Interest expense	(661)	(1,041)	(2,071)	(2,915)
Interest income	65	14	121	28
Other, net	(638)	(1,043)	(2,147)	(2,367)
Income before income taxes	13,418	11,272	28,333	16,435
Income taxes	5,122	4,310	11,192	6,360
Net income	$ 8,296	$ 6,962	$ 17,141	$ 10,075
Net income per share:
Basic	$ 0.59	$ 0.50	$ 1.22	$ 0.72
Diluted	$ 0.56	$ 0.48	$ 1.18	$ 0.69
Weighted-average shares outstanding:
Basic	14,133	13,993	14,008	14,059
Diluted	14,766	14,582	14,535	14,602
Dividends declared per share	$ 0.045	$ 0.043	$ 0.133	$ 0.128