Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011
Cash flows from operating activities:
Net income	$ 43,229	$ 39,301
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	21,749	24,926
Amortization	3,014	3,145
Loss on disposition of fixed assets	278	10
Gain on sale of marketable securities	(708)	(1,019)
Gain on acquisition of business	(414)	0
Changes in operating assets and liabilities:
Inventories	(8,981)	5,776
Accounts receivable and prepaid expenses	(5,869)	(277)
Income taxes recoverable	1,187	2,712
Accounts payable and other liabilities	1,298	(16,517)
Income taxes payable	12,087	465
Deferred income taxes	(3,078)	6,997
Other	356	(2,766)
Net cash provided by operating activities	64,148	62,753
Cash flows from investing activities:
Purchase of property and equipment	(40,358)	(47,352)
Proceeds from the sale of property and equipment	304	578
Purchase of marketable securities	(9,835)	(50,045)
Proceeds from maturities of marketable securities	0	4,880
Proceeds from the sale of marketable securities	17,436	6,561
Acquisition of business	(6,116)	0
Purchase of intangible assets	(90)	(121)
Net cash used in investing activities	(38,659)	(85,499)
Cash flows from financing activities:
Dividends paid	(16,138)	(15,601)
Net cash used in financing activities	(16,138)	(15,601)
Net increase (decrease) in cash and cash equivalents	9,351	(38,347)
Cash and cash equivalents at beginning of year	37,392	109,140
Cash and cash equivalents at end of period	$ 46,743	$ 70,793