Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Cash flows from operating activities:
Net income	$ 86,234	$ 99,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,232	74,003
(Gain) loss on disposition of fixed assets	524	2,618
Unrealized (gain) loss in value of equity securities	463	1,892
Deferred income taxes	7,812	3,247
Unrealized (gain) loss in SERP	(2,130)	(760)
Changes in operating assets and liabilities:
Inventories	11,161	13,816
Accounts receivable and prepaid expenses	11,289	(1,393)
Accounts payable and other liabilities	(20,868)	4,694
Income taxes	10,164	587
Other	224	(4,020)
Net cash provided by operating activities	182,105	194,181
Cash flows from investing activities:
Purchase of property and equipment	(118,156)	(83,574)
Proceeds from the sale of property and equipment	5,856	308
Purchase of marketable securities	(19,455)	(38,259)
Proceeds from the sale and maturities of marketable securities	12,275	3,690
Purchase of intangible assets	(165)	(127)
Change in SERP investment	(1,488)	(666)
Net cash used in investing activities	(121,133)	(118,628)
Cash flows from financing activities:
Dividends paid	(25,016)	(25,016)
Net cash used in financing activities	(25,016)	(25,016)
Net increase in cash and cash equivalents	35,956	50,537
Cash and cash equivalents at beginning of year	136,612	66,871
Cash and cash equivalents at end of period	$ 172,568	$ 117,408