Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity Under The Principal Option Plans

Option activity under the principal option plans as of March 31, 2013 and changes during the three months ended March 31, 2013 were as follows:

	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 30, 2012	2,744,057		$	17.24	5.01	$	1,321
Granted	100,367		12.23
Exercised	(82,854	)	12.03
Forfeited or expired	(23,383	)	12.24
Outstanding at March 31, 2013	2,738,187		$	17.26	5.01	$	3,046
Vested and expected to vest at March 31, 2013	2,558,300		$	17.78	4.71	$	2,446
Exercisable at March 31, 2013	2,141,920		$	19.28	3.83	$	1,113

Assumptions And Weighted-Average Fair Values Of Share-Based Payment Units Under Black-Scholes Option Pricing Model

The assumptions and weighted-average fair values were as follows:

Quarter (13 weeks) ended	March 31, 2013		March 25, 2012
Weighted-average fair value of grants	5.42		5.39
Valuation assumptions:
Expected dividend yield	0.00	%	0.00	%
Expected volatility	50.85	%	51.83	%
Expected life (in years)	5.07		5.06
Risk-free interest rate	0.792	%	0.893	%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of March 31, 2013 and changes during the three months ended March 31, 2013 were as follows:

	Number of Shares		Weighted- Average Vest Date (in years)	Weighted- Average Grant Date Fair Value
Nonvested at December 30, 2012	563,106		0.79	$	21.14
Granted	416,098			$	11.06
Vested	(106,227	)		$	11.99
Forfeited	(7,186	)		$	13.55
Nonvested at March 31, 2013	865,791		1.03	$	17.48
Vested and expected to vest at March 31, 2013	778,925		0.92
Vested at March 31, 2013	—		—