Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Income Statement [Abstract]
Revenues	$ 450,634	$ 398,945	$ 1,267,174	$ 1,143,548
Costs and expenses:
Operating	285,019	254,661	808,509	740,422
Selling	84,982	72,364	229,480	201,315
General and administrative	31,155	27,964	95,041	87,014
Depreciation and amortization	14,935	13,780	43,479	41,082
Gain on sale of assets, net	(1,694)	(2,837)	(6,530)	(5,787)
Total costs and expenses	414,397	365,932	1,169,979	1,064,046
Income from operations	36,237	33,013	97,195	79,502
Other income (expense):
Interest expense	(4,751)	(2,164)	(13,588)	(5,312)
Interest income	502	303	1,329	489
Other, net	(2,890)	(3,371)	(4,365)	(8,241)
Income before income taxes	29,098	27,781	80,571	66,438
Income taxes	8,401	7,317	21,835	17,407
Net income	$ 20,697	$ 20,464	$ 58,736	$ 49,031
Net income per share:
Net income per share, basic	$ 0.48	$ 0.46	$ 1.35	$ 1.10
Net income per share, diluted	$ 0.46	$ 0.44	$ 1.29	$ 1.05
Weighted-average shares outstanding:
Weighted-average shares outstanding, basic	43,123	44,148	43,394	44,422
Weighted-average shares outstanding, diluted	45,186	46,405	45,501	46,719