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 provided by operating activities:
Net income	$ 66,059	$ 50,142	$ 31,118
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,792	17,427	16,919
Impairment of long-lived assets	666	300	1,049
Loss on disposal of property, plant and equipment	118	64	25
Bad debt (recovery) expense	(55)	(15)	24
Stock-based compensation expense	6,178	3,124	4,106
Excess tax benefit from stock-based compensation arrangements	(5,346)	(3,014)	(1,640)
Deferred income taxes	(453)	4,425	2,131
Changes in operating assets and liabilities:
Accounts receivable	(3,161)	(2,146)	177
Inventories	(7,458)	(1,056)	(2,850)
Prepaid expenses and other assets	(2,146)	(3,950)	6,483
Accounts payable	(617)	(5,832)	5,052
Accrued expenses and other current liabilities	894	7,340	3,398
Other liabilities	(711)	1,021	(427)
Net cash provided by operating activities	72,760	67,830	65,565
Cash flows used in investing activities:
Purchases of property, plant and equipment	(19,599)	(13,608)	(16,997)
Proceeds from disposal of property, plant and equipment		20	8
Net cash used in investing activities	(19,599)	(13,588)	(16,989)
Cash flows used in financing activities:
Repurchase of Class A Common Stock	(62,824)	(67,981)	(7,080)
Proceeds from exercise of stock options	4,107	3,661	2,806
Excess tax benefit from stock-based compensation arrangements	5,346	3,014	1,640
Net proceeds from sale of investment shares	691	552	465
Net cash used in financing activities	(52,680)	(60,754)	(2,169)
Change in cash and cash equivalents	481	(6,512)	46,407
Cash and cash equivalents at beginning of year	48,969	55,481	9,074
Cash equivalents at end of year	49,450	48,969	55,481
Supplemental disclosure of cash flow information:
Income taxes paid	$ 40,556	$ 24,769	$ 18,193