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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 44,307 $ 43,229
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 24,512 21,749
Amortization 3,511 3,014
(Gain) loss on disposition of fixed assets (2,903) 278
Gain on sale of marketable securities (1,369) (708)
Gain on sale of intangible assets (250) 0
Gain on acquisition of business 0 (414)
Changes in operating assets and liabilities:    
Inventories 11,291 (8,981)
Accounts receivable and prepaid expenses (8,029) (5,869)
Income taxes recoverable 0 1,187
Accounts payable and other liabilities (3,360) 1,298
Income taxes payable 4,476 12,087
Deferred income taxes 6,260 (3,078)
Other (82) 356
Net cash provided by operating activities 78,364 64,148
Cash flows from investing activities:    
Purchase of property and equipment (57,276) (40,358)
Proceeds from the sale of property and equipment 3,386 304
Purchase of marketable securities (7,820) (9,835)
Proceeds from maturities of marketable securities 650 0
Proceeds from the sale of marketable securities 13,945 17,436
Acquisition of business 0 (6,116)
Purchase of intangible assets (483) (90)
Proceeds from the sale of intangible assets 250 0
Net cash used in investing activities (47,348) (38,659)
Cash flows from financing activities:    
Dividends paid (16,138) (16,138)
Net cash used in financing activities (16,138) (16,138)
Net increase in cash and cash equivalents 14,878 9,351
Cash and cash equivalents at beginning of year 21,439 37,392
Cash and cash equivalents at end of period $ 36,317 $ 46,743