Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Activity Related to Employee and Non-Employee Restricted Stock

Activity related to both employee and non-employee restricted stock for the year ended December 31, 2020 is as follows (in thousands, except per share amounts):

	Shares	Weighted Average Grant Date Fair Value/Share
RESTRICTED STOCK AT DECEMBER 31, 2019	198	$	110.89
Shares granted	101	145.48
Shares vested	(68)	114.10
Shares forfeited	(9)	126.90
RESTRICTED STOCK AT DECEMBER 31, 2020	222	$	124.77

Summary of Stock Appreciation Rights

Activity related to SARs for the year ended December 31, 2020 is as follows (in thousands, except per share amounts):

	Number of Rights	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
OUTSTANDING AT DECEMBER 31, 2019	1,572	$	110.66
Granted	287	146.22
Exercised	(448)	105.51
Forfeited	(26)	127.36
Canceled	(2)	126.63
OUTSTANDING AT DECEMBER 31, 2020	1,383	$	119.37	6.9 years	$	51,741
EXERCISABLE AT DECEMBER 31, 2020	980	$	112.83	6.1 years	$	43,057

Summary of the Weighted-Average Assumption Used in Estimating Fair Value of Stock Appreciation Rights

The following table summarizes the weighted-average assumptions used in estimating the fair value of the SARs granted during the years 2020, 2019 and 2018:

Grant Date	Expected Dividend Yield		Expected Volatility		Risk Free Interest Rate		Expected Term	Weighted Avg. Grant Date Fair Value of 1 SAR
2020	2.5	%	23.5	%	1.3	%	5.5 years	$	24.52
2019	2.7	%	22.7	%	1.8	%	5.5 years	$	21.25
2018	2.9	%	21.7	%	2.8	%	5.5 years	$	18.23

Summary of the Attributes of the Performance Shares Granted During the Period

Grant Date	Shares Outstanding at 12/31/2020	Fair Value		Performance Period	Payout Range
2020	61,595	$	151.78	Jan 2020-Dec 2022	0-200% + up to a multiple of 150x
2018	48,235	$	98.80	Jan 2019-Dec 2021	0-200% + up to a multiple of 120x

The following table summarizes the attributes of the performance shares granted in 2017 and outstanding at December 31, 2020:

Grant Date	Shares Outstanding at 12/31/2020	Fair Value		Performance Period	Payout Range
2017	18,530	$	118.55	Jan 2018 - Dec 2020	0-250%