Stock-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of nonvested performance awards granted

Information with respect to performance awards granted is as follows:

	Performance awards	Weighted average grant date fair value per award
Outstanding at December 31, 2019	253,432	$	176.27
Granted (1)	76,458	238.72
Change in awards based on performance (2)	18,112	177.26
Converted to restricted stock	(96,317)	177.26
Forfeited	(10,488)	188.52
Outstanding at September 30, 2020	241,197	$	195.22

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(1)The amount of restricted stock that ultimately may be earned is based on the total shareholder return metrics related to the Company's common stock for 38,461 performance awards and financial metrics related to operating performance, net asset value and leverage metrics of the Company for 37,997 performance awards.

(2)Represents the change in the number of performance awards earned based on performance achievement for the performance period.

Summary of valuation options

The Company used a Monte Carlo model to assess the compensation cost associated with the portion of the performance awards granted in 2020 for which achievement will be determined by using total shareholder return measures. The assumptions used are as follows:

	2020
Dividend yield	2.8%
Estimated volatility over the life of the plan (1)	11.1% - 15.5%
Risk free rate	1.45% - 1.62%
Estimated performance award value based on total shareholder return measure	$254.72

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(1)Estimated volatility of the life of the plan is using 50% historical volatility and 50% implied volatility.

Schedule of restricted stock granted

Information with respect to restricted stock granted is as follows:

	Restricted stock shares	Restricted stock shares weighted average grant date fair value per share		Restricted stock shares converted from performance awards
Outstanding at December 31, 2019	148,326	$	181.29	163,111
Granted - restricted stock shares	69,109	221.18		96,317
Vested - restricted stock shares	(77,761)	178.32		(109,758)
Forfeited	(5,637)	195.89		(1,784)
Outstanding at September 30, 2020	134,037	$	202.96	147,886