Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 25, 2011	Jun. 26, 2010
Cash flows from operating activities:
Net income	$ 39,301	$ 37,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	24,926	23,690
Amortization	3,145	3,280
Loss (gain) on disposition of fixed assets	10	(1,285)
Gain on sale of marketable securities	(1,019)	(223)
Changes in operating assets and liabilities:
Inventories	5,776	3,193
Accounts receivable and prepaid expenses	(277)	6,857
Income taxes recoverable	2,712
Accounts payable and other liabilities	(16,517)	(18,518)
Income taxes payable	465	22,890
Deferred income taxes	6,997	(1,259)
Other	(2,766)	34
Net cash provided by operating activities	62,753	76,550
Cash flows from investing activities:
Purchase of property and equipment	(47,352)	(22,683)
Proceeds from the sale of property and equipment	578	1,922
Purchase of marketable securities	(50,045)
Proceeds from maturities of marketable securities	4,880	1,745
Proceeds from the sale of marketable securities	6,561	341
Purchase of intangible assets	(121)
Net cash used in investing activities	(85,499)	(18,675)
Cash flows from financing activities:
Dividends paid	(15,601)	(15,601)
Net cash used in financing activities	(15,601)	(15,601)
Net (decrease) increase in cash and cash equivalents	(38,347)	42,274
Cash and cash equivalents at beginning of year	109,140	67,065
Cash and cash equivalents at end of period	$ 70,793	$ 109,339