Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities:
Net income	$ 55,167	$ 71,721	$ 82,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	59,004	51,068	44,153
Amortization	7,865	7,207	6,498
Gain on disposition of fixed assets	(2,630)	(2,033)	(1,407)
Impairment of fixed assets	0	2,088	0
Gain on sale of marketable securities	(63)	(1,775)	(713)
Gain on sale of intangible assets	0	(780)	0
Gain on acquisition of business	0	0	(414)
Deferred income taxes	3,785	10,377	15,611
Changes in operating assets and liabilities:
Inventories	811	4,791	(17,936)
Accounts receivable, prepaid expenses and other current assets	(13,588)	(10,512)	(2,569)
Income taxes recoverable	(612)	0	1,226
Accounts payable and other liabilities	15,894	9,546	(5,045)
Income taxes payable	(1,628)	269	1,359
Other	(895)	665	687
Net cash provided by operating activities	123,110	142,632	123,961
Cash flows from investing activities:
Purchase of property and equipment	(79,177)	(128,055)	(109,774)
Proceeds from the sale of property and equipment	3,614	4,451	2,542
Purchase of marketable securities	(20,118)	(12,635)	(13,790)
Proceeds from maturities of marketable securities	4,050	1,150	0
Proceeds from the sale of marketable securities	7,668	30,170	19,941
Acquisition of business	0	0	(6,116)
Purchase of intangible assets	(1,479)	(937)	(439)
Proceeds from the sale of intangible assets	0	780	0
Change in SERP investment	(369)	(1,694)	(165)
Net cash used in investing activities	(85,811)	(106,770)	(107,801)
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 increase (decrease) in cash and cash equivalents	5,021	3,584	(16,118)
Cash and cash equivalents at beginning of year	17,965	14,381	30,499
Cash and cash equivalents at end of year	$ 22,986	$ 17,965	$ 14,381