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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Cash flows from operating activities:      
Net income $ 75,584 $ 68,291 $ 62,800
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 53,185 48,567 47,201
Amortization 6,198 6,491 6,207
Gain loss on disposition / impairment of fixed assets (576) (1,023) 60
Gain on sale of marketable securities (1,447) (223)  
Changes in operating assets and liabilities:      
Inventories 4,830 (8,006) (27,780)
Accounts receivable and prepaid expenses (1,664) (1,272) (8,066)
Income taxes recoverable 1,486 (2,712)  
Accounts payable and other liabilities 2,119 297 37,472
Income taxes payable 0 (484) (254)
Deferred income taxes 16,723 38,195 1,372
Other (4,029) (1,379) (93)
Net cash provided by operating activities 152,409 146,742 118,919
Cash flows from investing activities:      
Purchase of property and equipment (110,517) (69,869) (45,249)
Proceeds from the sale of property and equipment 2,097 2,013 991
Purchase of marketable securities (81,885) (12,245)  
Proceeds from maturities of marketable securities 8,620 6,296 2,197
Proceeds from the sale of marketable securities 16,019 341  
Acquisition of business     (35,802)
Purchase of intangible assets (121)   (138)
Net cash used in investing activities (165,787) (73,464) (78,001)
Cash flows from financing activities:      
Dividends paid (58,370) (31,201) (31,231)
Purchase of treasury stock   (2) (1,973)
Net cash used in financing activities (58,370) (31,203) (33,204)
Net (decrease) increase in cash and cash equivalents (71,748) 42,075 7,714
Cash and cash equivalents at beginning of year 109,140 67,065 59,351
Cash and cash equivalents at end of year $ 37,392 $ 109,140 $ 67,065