Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Valuation Assumptions

For stock options granted during the three months ended March 31, 2018 valued using the Black-Scholes option valuation model, we used the following assumptions:

	Three Months Ended
	March 31, 2018
Risk-free interest rate	2.65	%
Expected dividend yield	—	%
Expected term of option	4 years
Expected volatility	45.0	%
Weighted-average expected volatility	45.0	%

Schedule of Stock Option Activity and Weighted Average Exercise Prices

A summary of stock option activity and weighted-average exercise prices during the three months ended March 31, 2019 follows:

	Options		Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value as of March 31, 2019
Outstanding at January 1, 2019	792,943		$	47.59
Granted	—		—
Forfeited or expired	(65,868	)	54.23
Exercised	(8,513	)	34.18
Outstanding at March 31, 2019	718,562		$	47.38	4.3	$	3,118
Options exercisable at March 31, 2019	540,597		$	46.57	2.6	$	2,410

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 three months ended March 31, 2019:

	Shares		Weighted-Average Grant Date Fair Value
Non-vested at January 1, 2019	311,000		$	42.66
Granted	172,324		45.32
Forfeited	(8,453	)	44.36
Vested	(82,930	)	34.47
Non-vested at March 31, 2019	391,941		$	45.53