Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Cash flows from operating activities:
Net income	$ 59,330	$ 54,381	$ 73,186
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	61,834	59,004	51,068
Amortization	8,280	7,865	7,207
Gain on disposition of fixed assets	(54)	(2,630)	(2,033)
Impairment of fixed assets	0	0	2,088
Gain on sale of marketable securities	(27)	(63)	(1,775)
Gain on sale of intangible assets	0	0	(780)
Deferred income taxes	(212)	3,235	11,402
Changes in operating assets and liabilities:
Inventories	10,242	811	4,791
Accounts receivable and prepaid expenses	(17,127)	(13,588)	(10,512)
Income taxes recoverable	(1,054)	(612)	0
Accounts payable and other liabilities	14,403	17,230	7,056
Income taxes payable	0	(1,628)	269
Other	1,118	(895)	665
Net cash provided by operating activities	136,733	123,110	142,632
Cash flows from investing activities:
Purchase of property and equipment	(90,210)	(79,177)	(128,055)
Proceeds from the sale of property and equipment	1,929	3,614	4,451
Purchase of marketable securities	(31,329)	(20,118)	(12,635)
Proceeds from maturities of marketable securities	3,201	4,050	1,150
Proceeds from the sale of marketable securities	9,171	7,668	30,170
Purchase of intangible assets	(2,649)	(1,479)	(937)
Proceeds from the sale of intangible assets	0	0	780
Change in SERP investment	42	(369)	(1,694)
Net cash used in investing activities	(109,845)	(85,811)	(106,770)
Cash flows from financing activities:
Dividends paid	(32,278)	(32,278)	(32,278)
Net cash used in financing activities	(32,278)	(32,278)	(32,278)
Net (decrease) increase in cash and cash equivalents	(5,390)	5,021	3,584
Cash and cash equivalents at beginning of year	22,986	17,965	14,381
Cash and cash equivalents at end of year	$ 17,596	$ 22,986	$ 17,965