Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 26, 2011
Cash flows from operating activities:
Net income	$ 20,026	$ 18,601
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	10,821	12,121
Amortization	1,499	1,611
Loss (gain) on disposition of fixed assets	70	(2)
Gain on sale of marketable securities	(3)	(622)
Changes in operating assets and liabilities:
Inventories	(14,002)	7,625
Accounts receivable and prepaid expenses	1,097	3,147
Income taxes recoverable	1,187	2,712
Accounts payable and other liabilities	(7,480)	(18,710)
Income taxes payable	12,200	5,933
Deferred income taxes	(2,184)	1,563
Other	(250)	(1,721)
Net cash provided by operating activities	22,981	32,258
Cash flows from investing activities:
Purchase of property and equipment	(13,021)	(22,728)
Proceeds from the sale of property and equipment	19	374
Purchase of marketable securities	(4,185)	(27,730)
Proceeds from maturities of marketable securities	0	1,230
Proceeds from the sale of marketable securities	2,203	3,644
Purchase of intangible assets	(90)	0
Net cash used in investing activities	(15,074)	(45,210)
Cash flows from financing activities:
Dividends paid	(8,070)	(7,801)
Net cash used in financing activities	(8,070)	(7,801)
Net decrease in cash and cash equivalents	(163)	(20,753)
Cash and cash equivalents at beginning of year	37,392	109,140
Cash and cash equivalents at end of period	$ 37,229	$ 88,387