Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015
Cash flows from operating activities:
Net income	$ 35,393	$ 29,967
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	32,481	30,622
Amortization	4,506	4,140
Loss (gain) on disposition of fixed assets	58	(271)
Gain on sale of marketable securities	(269)	(15)
Deferred income taxes	(4,775)	(7,169)
Changes in operating assets and liabilities:
Inventories	5,601	8,680
Accounts receivable and prepaid expenses	19,745	4,314
Income taxes recoverable	1,666	612
Accounts payable and other liabilities	(25,187)	(14,240)
Income taxes payable	4,406	6,836
Other	729	442
Net cash provided by operating activities	74,354	63,918
Cash flows from investing activities:
Purchase of property and equipment	(54,474)	(38,979)
Proceeds from the sale of property and equipment	146	1,285
Purchase of marketable securities	(1,284)	(13,512)
Proceeds from maturities of marketable securities	835	600
Proceeds from the sale of marketable securities	15,213	6,553
Purchase of intangible assets	(728)	(1,446)
Change in SERP investment	(1,264)	(1,388)
Net cash used in investing activities	(41,556)	(46,887)
Cash flows from financing activities:
Dividends paid	(16,139)	(16,139)
Net cash used in financing activities	(16,139)	(16,139)
Net increase in cash and cash equivalents	16,659	892
Cash and cash equivalents at beginning of year	17,596	22,986
Cash and cash equivalents at end of period	$ 34,255	$ 23,878