Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Cash flows from operating activities:
Net income	$ 118,917	$ 67,983	$ 62,738
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	99,370	93,706	93,567
Loss on disposition of fixed assets	3,914	782	1,274
Impairment of fixed assets	0	0	1,532
(Gain) on sale of marketable securities	0	(51)	54
Unrealized (gain) loss in value of equity securities	1,791	(1,975)	1,606
Deferred income taxes	5,657	5,765	3,418
Unrealized (gain) loss in SERP	(2,641)	(135)	1,883
Changes in operating assets and liabilities:
Inventories	10,782	950	(1,247)
Accounts receivable and prepaid expenses	(6,804)	2,431	(5,874)
Accounts payable and other liabilities	54,658	(505)	(18,583)
Income taxes	(3,139)	913	9,330
Other	(4,515)	1,822	565
Net cash provided by operating activities	277,990	171,686	150,263
Cash flows from investing activities:
Purchase of property and equipment	(130,991)	(101,456)	(95,696)
Proceeds from the sale of property and equipment	470	4,245	1,734
Purchase of marketable securities	(50,789)	(13,620)	(5,627)
Proceeds from the sale and maturities of marketable securities	7,730	7,165	12,384
Purchase of intangible assets	(127)	(1,489)	(3,540)
Change in SERP investment	(1,188)	(4,114)	(2,093)
Net cash used in investing activities	(174,895)	(109,269)	(92,838)
Cash flows from financing activities:
Payments on long-term debt	0	0	(34,988)
Dividends paid	(33,354)	(33,354)	(32,546)
Net cash used in financing activities	(33,354)	(33,354)	(67,534)
Net increase in cash and cash equivalents	69,741	29,063	(10,109)
Cash and cash equivalents at beginning of year	66,871	37,808	47,917
Cash and cash equivalents at end of period	$ 136,612	$ 66,871	$ 37,808