Stock-Based Compensation (Tables)

3 Months Ended

Mar. 30, 2014

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 30, 2014 and changes during the quarter ended March 30, 2014 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 29, 2013	2,450,660		$	17.70	4.35	$	4,285
Granted	206,280		14.84
Exercised	(5,430	)	10.80
Forfeited or expired	(100,857	)	16.85
Outstanding at March 30, 2014	2,550,653		$	17.51	4.66	$	2,593
Vested and expected to vest at March 30, 2014	2,449,476		$	17.77	4.49	$	2,336
Exercisable at March 30, 2014	2,017,125		$	19.06	3.52	$	1,431

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:

Three months ended	March 30, 2014		March 31, 2013
Weighted-average fair value of grants	6.44		5.42
Valuation assumptions:
Expected dividend yield	0.00	%	0.00	%
Expected volatility	48.16	%	50.85	%
Expected life (in years)	5.11		5.07
Risk-free interest rate	1.461	%	0.792	%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of March 30, 2014 and changes during the quarter ended March 30, 2014 were as follows:

	Number of Shares		Weighted- Average Vest Date (in years)	Weighted- Average Grant Date Fair Value
Nonvested at December 29, 2013	852,508		0.64	$	17.36
Granted	266,715			$	14.87
Vested	(188,333	)		$	14.81
Forfeited	(39,796	)		$	12.87
Nonvested at March 30, 2014	891,094		1.18	$	17.36
Vested and expected to vest at March 30, 2014	822,424		1.13
Vested at March 30, 2014	—		—