Stock-Based Compensation (Tables)

9 Months Ended

Sep. 28, 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 September 28, 2014 and changes during the nine months ended September 28, 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	212,080		14.78
Exercised	(64,237	)	9.11
Forfeited or expired	(232,333	)	17.14
Outstanding at September 28, 2014	2,366,170		$	17.72	4.27	$	1,738
Vested and expected to vest at September 28, 2014	2,315,191		$	17.84	4.16	$	1,667
Exercisable at September 28, 2014	1,939,183		$	18.86	3.29	$	1,299

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 28, 2014		September 29, 2013
Weighted-average fair value of grants	6.41		5.46
Valuation assumptions:
Expected dividend yield	0.00	%	0.00	%
Expected volatility	48.09	%	50.79	%
Expected life (in years)	7.68		5.08
Risk-free interest rate	1.465	%	0.835	%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of September 28, 2014 and changes during the nine months ended September 28, 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	349,040			$	14.38
Vested	(196,686	)		$	14.74
Forfeited	(53,536	)		$	13.00
Nonvested at September 28, 2014	951,326		0.80	$	17.06
Vested and expected to vest at September 28, 2014	902,847		0.75
Vested and deferred at September 28, 2014	61,250		—