Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Cash flows from operating activities:
Net income	$ 87,162	$ 59,330	$ 54,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	66,496	61,834	59,004
Amortization	10,366	8,280	7,865
Loss (gain) on disposition of fixed assets	1,353	(54)	(2,630)
Impairment of fixed assets	894	0	0
Gain on sale of marketable securities	(437)	(27)	(63)
Gain on sale of intangible assets	(200)	0	0
Gain on acquisition of business	(23,879)	0	0
Deferred income taxes	5,703	(212)	3,235
Changes in operating assets and liabilities:
Inventories	(38,102)	10,242	811
Accounts receivable and prepaid expenses	(5,096)	(17,127)	(13,588)
Income taxes recoverable	41	(1,054)	(612)
Accounts payable and other liabilities	46,131	14,403	17,230
Income taxes payable	0	0	(1,628)
Other	1,161	1,118	(895)
Net cash provided by operating activities	151,593	136,733	123,110
Cash flows from investing activities:
Purchase of property and equipment	(142,144)	(90,210)	(79,177)
Proceeds from the sale of property and equipment	442	1,929	3,614
Purchase of marketable securities	(40,858)	(31,329)	(20,118)
Proceeds from maturities of marketable securities	1,335	3,201	4,050
Proceeds from the sale of marketable securities	62,566	9,171	7,668
Acquisition of business	(63,632)	0	0
Purchase of intangible assets	(2,568)	(2,649)	(1,479)
Proceeds from sale of intangible assets	200	0	0
Change in SERP investment	(2,075)	42	(369)
Net cash used in investing activities	(186,734)	(109,845)	(85,811)
Cash flows from financing activities:
Proceeds from long-term debt	64,476	0	0
Dividends paid	(32,278)	(32,278)	(32,278)
Net cash provided by (used in) financing activities	32,198	(32,278)	(32,278)
Net (decrease) increase in cash and cash equivalents	(2,943)	(5,390)	5,021
Cash and cash equivalents at beginning of year	17,596	22,986	17,965
Cash and cash equivalents at end of year	$ 14,653	$ 17,596	$ 22,986