Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014
Cash flows from operating activities:
Net income	$ 42,754	$ 40,682
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	45,942	43,763
Amortization	6,145	5,737
Gain on disposition of fixed assets	(26)	(2,531)
Gain on sale of marketable securities	(15)	(46)
Deferred income taxes	(4,929)	(42)
Changes in operating assets and liabilities:
Inventories	8,483	20,720
Accounts receivable and prepaid expenses	1,969	(9,113)
Income taxes recoverable	612	0
Accounts payable and other liabilities	(4,533)	(6,522)
Income taxes payable	3,314	(1,095)
Other	824	117
Net cash provided by operating activities	100,540	91,670
Cash flows from investing activities:
Purchase of property and equipment	(64,874)	(58,027)
Proceeds from the sale of property and equipment	1,302	3,288
Purchase of marketable securities	(26,184)	(8,138)
Proceeds from maturities of marketable securities	1,851	2,250
Proceeds from the sale of marketable securities	7,067	1,651
Purchase of intangible assets	(1,886)	(1,125)
Change in SERP investment	(741)	(81)
Net cash used in investing activities	(83,465)	(60,182)
Cash flows from financing activities:
Dividends paid	(24,209)	(24,209)
Net cash used in financing activities	(24,209)	(24,209)
Net (decrease) increase in cash and cash equivalents	(7,134)	7,279
Cash and cash equivalents at beginning of year	22,986	17,965
Cash and cash equivalents at end of period	$ 15,852	$ 25,244