Stock-Based Compensation (Tables)

9 Months Ended

Sep. 29, 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 September 29, 2013 and changes during the nine months ended September 29, 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	132,367		12.32
Exercised	(196,924	)	11.04
Forfeited or expired	(140,450	)	13.40
Outstanding at September 29, 2013	2,539,050		$	17.68	4.58	$	5,658
Vested and expected to vest at September 29, 2013	2,435,385		$	18.02	4.40	$	4,932
Exercisable at September 29, 2013	2,069,447		$	19.28	3.62	$	2,788

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:

Nine months ended	September 29, 2013		September 23, 2012
Weighted-average fair value of grants	5.46		4.38
Valuation assumptions:
Expected dividend yield	0.00	%	0.00	%
Expected volatility	50.79	%	52.08	%
Expected life (in years)	5.08		5.06
Risk-free interest rate	0.835	%	0.750	%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of September 29, 2013 and changes during the nine months ended September 29, 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	568,533			$	12.19
Vested	(248,277	)		$	14.47
Forfeited	(29,066	)		$	14.02
Nonvested at September 29, 2013	854,296		0.88	$	17.36
Vested and expected to vest at September 29, 2013	766,057		0.84
Vested at September 29, 2013	52,500		—