Stock-Based Compensation (Stock Option Activity Under The Principal Option Plans) (Details) (Stock Options And Awards [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 25, 2012 Y
Stock Options And Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at beginning of period	2,600,805
Number of Shares, Granted	410,270
Number of Shares, Exercised	(27,926)
Number of Shares, Forfeited or expired	(70,338)
Number of Shares, Outstanding at end of period	2,912,811
Number of Shares, Vested and expected to vest	2,814,373
Number of Shares, Exercisable	2,277,838
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 19.54
Weighted-Average Exercise Price, Granted	$ 11.95
Weighted-Average Exercise Price, Exercised	$ 8.88
Weighted-Average Exercise Price, Forfeited or expired	$ 15.36
Weighted-Average Exercise Price, Outstanding at end of period	$ 18.67
Weighted-Average Exercise Price, Vested and expected to vest	$ 18.86
Weighted-Average Exercise Price, Exercisable	$ 19.68
Weighted-Average Remaining Contractual Term, Outstanding at beginning of period in years	4.39
Weighted-Average Remaining Contractual Term, Outstanding at end of period in years	5.01
Weighted-Average Remaining Contractual Term, Vested and expected to vest in years	4.86
Weighted-Average Remaining Contractual Term, Exercisable	3.92
Aggregate Intrinsic Value, Outstanding at beginning of period	$ 512
Aggregate Intrinsic Value, Outstanding at end of period	429
Aggregate Intrinsic Value, Vested and expected to vest	429
Aggregate Intrinsic Value, Exercisable	$ 429