Stock-Based Compensation (Tables)

3 Months Ended

Mar. 29, 2015

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 29, 2015 and changes during the quarter ended March 29, 2015 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 28, 2014	2,349,447		$	17.77	3.98	$	2,716
Granted	252,260		13.56
Exercised	(11,005	)	9.46
Forfeited or expired	(85,803	)	17.03
Outstanding at March 29, 2015	2,504,899		$	17.41	4.47	$	936
Vested and expected to vest at March 29, 2015	2,380,156		$	17.61	4.21	$	922
Exercisable at March 29, 2015	1,992,965		$	18.57	3.28	$	692

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

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

Three months ended	March 29, 2015			March 30, 2014
Weighted-average fair value of grants	$	5.54		$	6.44
Valuation assumptions:
Expected life (in years)	5.53			5.11
Expected dividend yield	0.00		%	0.00		%
Expected volatility	46.05		%	48.16		%
Risk-free interest rate	1.540		%	1.461		%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of March 29, 2015 and changes during the quarter ended March 29, 2015 were as follows:

	Number of Shares		Weighted- Average Vest Date (in years)	Weighted- Average Grant Date Fair Value
Nonvested at December 28, 2014	940,857		0.56	$	17.11
Granted	263,810			$	13.25
Vested	(230,334	)		$	13.69
Forfeited	(4,590	)		$	14.21
Nonvested at March 29, 2015	969,743		1.31	$	16.89
Vested and expected to vest at March 29, 2015	856,572		1.19
Vested and deferred at March 29, 2015	411,250		—