Stock-Based Compensation (Tables)

9 Months Ended

Sep. 27, 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 September 27, 2015 and changes during the nine months ended September 27, 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	266,080		13.40
Exercised	(15,430	)	8.98
Forfeited or expired	(436,542	)	18.76
Outstanding at September 27, 2015	2,163,555		$	17.10	4.51	$	—
Vested and expected to vest at September 27, 2015	2,145,409		$	17.12	4.47	$	—
Exercisable at September 27, 2015	1,748,868		$	17.89	3.45	$	—

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:

Nine months ended	September 27, 2015			September 28, 2014
Weighted-average fair value of grants	$	5.48		$	6.41
Valuation assumptions:
Expected life (in years)	5.51			7.68
Expected dividend yield	0.00		%	0.00		%
Expected volatility	45.95		%	48.09		%
Risk-free interest rate	1.541		%	1.465		%

Nonvested Service Based Restricted Stock Units

Nonvested restricted stock units as of September 27, 2015 and changes during the nine months ended September 27, 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	331,000			$	12.61
Vested	(290,938	)		$	12.93
Forfeited	(38,563	)		$	14.61
Nonvested at September 27, 2015	942,356		0.98	$	16.92
Vested and expected to vest at September 27, 2015	926,720		0.96
Vested and deferred at September 27, 2015	424,375		—