Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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

Summary of Assumptions for Options Issued

The following table summarizes the assumptions we used to value options issued during the three months ended March 31, 2017 and 2016:

	March 31, 2017		March 31, 2016
Expected Term (in years)	5.3		5.3
Volatility	24.85	%	29.60	%
Weighted-average risk free interest rate	1.95	%	1.24	%
Dividend Yield	0.6	%	0.8	%

Summary of Options Including Non-Plan Stock Options

The following table summarizes our stock option activity for the three months endedMarch 31, 2017.

	Three months ended March 31, 2017
	Shares			Weighted- Average Exercise Price
Stock Options:
Outstanding at beginning of period	1,547,980			17.83
Granted	45,134			47.05
Exercised	(117,612		)	15.47
Forfeited	(750		)	15.83
Outstanding at end of period	1,474,752			18.91
Nonvested at end of period	424,459			23.64
Exercisable at end of period	1,050,293			17.00
Weighted-average fair value of options granted	$	11.50

Schedule of Nonvested Stock Option Outstanding

The following table provides information about our nonvested stock options outstanding at March 31, 2017:

	March 31, 2017
	Shares			Weighted- Average Exercise Price
Stock Options:
Nonvested at beginning of period	$	704,421		$	19.08
Granted	45,134			47.05
Forfeited	(750		)	15.83
Vested during period	(324,346		)	17.01
Nonvested at end of period	$	424,459		23.64

Schedule of RSAs and RSUs

The following table summarizes the Company’s RSAs and RSUs, including performance awards, and changes during the three months ended March 31, 2017:

	Three months ended March 31, 2017
	Units (in whole)			Weighted Average Grant-Date Fair Value per Unit
Outstanding at beginning of period	$	135,592		$	27.14
Granted	36,523			47.05
Vested	(33,803		)	20.22
Forfeited	(1,823		)	27.21
Outstanding at end of period	$	136,489		34.20