Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 20,129	$ 20,026
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,063	10,821
Amortization	1,713	1,499
Loss on disposition of fixed assets	40	70
Gain on sale of marketable securities	(47)	(3)
Gain on sale of intangible assets	(250)
Changes in operating assets and liabilities:
Inventories	3,682	(14,002)
Accounts receivable and prepaid expenses	(16,491)	1,097
Income taxes recoverable		1,187
Accounts payable and other liabilities	6,402	(7,480)
Income taxes payable	5,000	12,200
Deferred income taxes	3,680	(2,184)
Other	239	(250)
Net cash provided by operating activities	36,160	22,981
Cash flows from investing activities:
Purchase of property and equipment	(30,017)	(13,021)
Proceeds from the sale of property and equipment	308	19
Purchase of marketable securities	(2,000)	(4,185)
Proceeds from the sale of marketable securities	6,617	2,203
Purchase of intangible assets	(10)	(90)
Net cash used in investing activities	(25,102)	(15,074)
Cash flows from financing activities:
Dividends paid	(8,070)	(8,070)
Net cash used in financing activities	(8,070)	(8,070)
Net increase (decrease) in cash and cash equivalents	2,988	(163)
Cash and cash equivalents at beginning of year	21,439	37,392
Cash and cash equivalents at end of period	$ 24,427	$ 37,229