Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 33,257	$ 32,304
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,017	19,936
Deferred income taxes	(1,333)	(2,364)
Stock-based compensation expense	1,727	1,749
Amortization of landlord contributions	(535)	(534)
Amortization of deferred debt financing costs	112	124
(Gain) loss on asset disposals, net	(92)	124
Asset impairments	0	349
Other adjustments	(81)	29
Changes in operating assets and liabilities:
Accounts receivable	3,573	1,575
Inventories	(1,262)	1,091
Prepaid expenses	(1,430)	(3,999)
Accounts payable	(3,153)	1,287
Accrued expenses	4,324	1,989
Unearned revenues	(528)	315
Accrued interest	80	659
Income taxes payable	20,281	22,295
Deferred rent liability	328	819
Deferred landlord contributions	703	(95)
Net cash provided by operating activities	75,988	77,653
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(15,713)	(20,028)
Other investing activities	416	292
Net cash used in investing activities	(15,297)	(19,736)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net repayments on revolving credit facility	(46,500)	(49,600)
Payments on capital lease obligations	(211)	(205)
Dividends paid	(233)	(4,101)
Excess tax benefit realized from stock-based compensation	29	619
Restricted stock returned for payment of taxes	(2,136)	(2,603)
Purchases of treasury stock	(9,970)
Other financing activities		2
Net cash used in financing activities	(59,021)	(55,888)
Effect of foreign exchange rate changes on cash	(192)	67
Change in cash and cash equivalents	1,478	2,096
Cash and cash equivalents at beginning of period	19,636	18,673
Cash and cash equivalents at end of period	21,114	20,769
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	2,050	2,090
Income taxes paid (refunded), net	1,792	(2)
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Accrued construction costs	2,610	1,926
Dividends payable	4,691	4,021
Capital lease obligations	$ 374	$ 3,367