Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Stock Option Activity and Weighted Average Exercise Prices

A summary of stock option activity and weighted-average exercise prices during the nine months ended September 30, 2016 follows:

	Options		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value as of September 30, 2016
Outstanding at January 1, 2016	1,178,585		$	48.14
Granted	194,740		33.17
Forfeited	(192,304	)	45.59
Exercised	(105,207	)	17.66
Unearned performance-based options	(23,328	)	59.97
Outstanding at September 30, 2016	1,052,486		$	48.61	4.6	$	1,070,788
Options exercisable at September 30, 2016	816,776		$	50.64	2.3	$	258,330

Schedule of Restricted Stock and Restricted Stock Units Activity and Weighted-Average Grant Date Fair Value

The following table summarizes the restricted stock and restricted stock unit activity and weighted average grant-date fair values for the nine months ended September 30, 2016:

	Shares		Weighted-Average Grant Date Fair Value
Non-vested at January 1, 2016	15,916		$	43.47
Granted	160,228		33.20
Forfeited	(8,212	)	33.05
Vested	(13,247	)	42.79
Unearned performance-based awards	(677	)	53.74
Non-vested at September 30, 2016	154,008		$	33.40

Employee Stock Option

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Valuation Assumptions

For stock options granted during the nine months ended September 30, 2016 and September 26, 2015 valued using the Black-Scholes option valuation model, we used the following assumptions:

	Nine Months Ended
	September 30, 2016		September 26, 2015
Risk-free interest rate	1.06% - 1.21%		0.80% - 1.09%
Expected dividend yield	—	%	—	%
Expected option life	4 years		3 years
Expected volatility	46.7% - 47.0%		42.3% - 48.5%
Weighted-average expected volatility	46.7	%	43.1	%

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Valuation Assumptions

The assumptions used to estimate the fair value of the performance-based stock options and restricted stock units granted during the nine months ended September 26, 2015 and valued under the Monte Carlo Simulation model were as follows:

	Nine Months Ended
	September 30, 2016		September 26, 2015
Risk-free interest rate	—	%	0.95% - 1.48%
Expected dividend yield	—	%	—	%
Expected option life	—		4 years
Expected volatility	—	%	44.5	%
Weighted-average expected volatility	—	%	44.5	%