Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of the status of the Company's restricted stock shares

A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of December 31, 2019 and changes during the year ended December 31, 2019 is presented below:

	Number of Shares		Weighted-Average Grant Date Fair Value ($)
Outstanding at December 31, 2018	297,797		47.95
Granted	148,120		53.41
Vested	(97,095	)	48.97
Forfeited	(15,856	)	53.00
Outstanding at December 31, 2019	332,966		49.84

Market Condition Performance Share Awards

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

Multiple input variables of performance share awards

The inputs utilized for the performance share awards based on total shareholder return are as follows:

	Weighted-Average at Grant Date for Twelve Months Ended December 31, 2019		Weighted-Average at Grant Date for Twelve Months Ended December 31, 2018
Expected volatility factor	0.38		0.39
Risk free interest rate	2.50	%	2.11	%
Expected term (in years)	2.97		2.96
Expected dividend yield	—	%	—	%

Performance share award activity

The following table summarizes the Company’s market condition performance share awards for the year ended December 31, 2019:

	Number of Awards		Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2018	82,907		53.92
Granted	50,293		70.77
Vested	(29,293	)	56.84
Forfeited	(7,748	)	57.15
Outstanding at December 31, 2019	96,159		61.58

Performance Condition Performance Share Awards

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

Performance share award activity

The following table summarizes the Company’s performance condition performance share awards for the year ended December 31, 2019:

	Number of Awards		Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2018	41,454		49.81
Granted	24,861		60.11
Vested	(14,648	)	55.50
Forfeited	(3,873	)	52.10
Outstanding at December 31, 2019	47,794		53.24