Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock Based Compensation [Abstract]

Schedule of Share based Payment Award Restricted Stock Valuation Assumptions

The following is a summary of the key assumptions used in the valuation calculations for market based awards granted during the years ended December 31, 2019, 2018 and 2017:

	2019	2018	2017
Risk free rate	2.578%	1.61% - 2.14%	0.65% - 1.57%
Dividend yield	4.043%	3.884%	3.573%
Volatility	18.95%	15.05% - 17.18%	20.43% - 21.85%
Requisite service period	3 years	3 years	3 years

Nonvested Restricted Stock Shares Activity

A summary of the status of the nonvested restricted shares as of December 31, 2019, and the changes for the year ended December 31, 2019, is presented below:

Nonvested Shares	Shares			Weighted Average Grant-Date Fair Value
Nonvested as of January 1, 2019		187,777		$	88.79
Issued		173,174			88.59
Vested		(125,381	)		74.35
Forfeited		(1,692	)		95.44
Nonvested as of December 31, 2019		233,878		$	96.33

Share-based Compensation, Stock Options, Activity

A summary of the status of the outstanding stock options as of December 31, 2019 and the changes for the year ended December 31, 2019 is presented below:

Stock Options	Options			Weighted Average Exercise Price
Outstanding as of January 1, 2019		90,615		$	77.16
Granted		—			—
Exercised		(69,852	)		76.96
Expired		—			—
Outstanding as of December 31, 2019		20,763		$	77.82