Consolidated Statement Of Changes In Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock At Cost [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interest [Member]	Total
Beginning Balance at Dec. 25, 2010	$ 665	$ 169,268	$ 844,132	$ (763,182)	$ 881	$ (797)	$ 250,967
Beginning Balance, shares at Dec. 25, 2010	66,535,169			18,674,902
Net income (loss)			80,375			(62)	80,313
Dividends paid ($0.155 per share)			(7,407)				(7,407)
Purchases of common stock, shares				1,013,507
Purchases of common stock				(41,966)			(41,966)
Purchase of noncontrolling interest		(8,859)				859	(8,000)
Stock-based compensation		3,783					3,783
Exercises of stock options and issuance and vesting of non-vested stock, including shortfall tax effect	1	574		(41)			534
Exercises of stock options and issuance and vesting of non-vested stock, including shortfall tax effect, shares	59,867			1,057
Foreign currency translation					169		169
Unrealized gain on available-for-sale investments, net of income taxes					148		148
Ending Balance at Sep. 24, 2011	$ 666	$ 164,766	$ 917,100	$ (805,189)	$ 1,198		$ 278,541
Ending Balance, shares at Sep. 24, 2011	66,595,036			19,689,466