Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Cash flows from operating activities:
Net income	$ 27,564	$ 44,307
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	28,409	24,512
Amortization	3,886	3,511
Gain on disposition of fixed assets	(1,807)	(2,903)
Gain on sale of marketable securities	(46)	(1,369)
Gain on sale of intangible assets	0	(250)
Deferred income taxes	(3,887)	6,260
Changes in operating assets and liabilities:
Inventories	21,521	11,291
Accounts receivable and prepaid expenses	(8,840)	(8,029)
Accounts payable and other liabilities	(11,246)	(3,360)
Income taxes payable	(45)	4,476
Other	214	(82)
Net cash provided by operating activities	55,723	78,364
Cash flows from investing activities:
Purchase of property and equipment	(35,806)	(57,276)
Proceeds from the sale of property and equipment	2,158	3,386
Purchase of marketable securities	(3,213)	(7,820)
Proceeds from maturities of marketable securities	1,750	650
Proceeds from the sale of marketable securities	1,216	13,945
Purchase of intangible assets	(412)	(483)
Proceeds from the sale of intangible assets		250
Change in SERP investment	(1,516)	(1,521)
Net cash used in investing activities	(35,823)	(48,869)
Cash flows from financing activities:
Dividends paid	(16,139)	(16,138)
Net cash used in financing activities	(16,139)	(16,138)
Net increase in cash and cash equivalents	3,761	13,357
Cash and cash equivalents at beginning of year	17,965	14,381
Cash and cash equivalents at end of period	$ 21,726	$ 27,738