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Stock Plans and Management Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

The weighted average price per Non-vested stock unit at grant date was $91.14, $64.13 and $49.12 for units granted in 2021, 2020 and 2019, respectively. Non-vested stock unit activity for the year ended December 31, 2021 was as follows:



(in thousands, except grant date fair value)	Non-vested Stock Unit Activity	Weighted Average Grant Date Fair Value ($)
Non-vested units, unvested as of January 1, 2021	571	57.31
Awarded	190	91.14
Forfeited	(14)	66.39
Vested	(112)	59.71
Non-vested units, unvested as of December 31, 2021	635	66.81

SARs and Stock Option Activity

SARs activity for all plans for the years ended December 31, 2021, 2020 and 2019, was as follows:


	2021						2020
(in thousands, except exercise price and terms)	SARs Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value		SARs Outstanding	Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding on January 1	22	$	23.41				119	$	21.57
Exercised	(16)	$	23.28		$	1,255	(97)	$	21.16	$	5,353
Forfeited	—	$	—				—	$	11.08
Outstanding on December 31	6	$	23.79	0.1 years	$	1,693	22	$	23.41	$	6,276
Exercisable and Vested on December 31	6	$	23.79	0.1 years	$	1,693	22	$	23.41	$	6,276


	2019
(in thousands, except exercise price and terms)	SARs Outstanding	Weighted Average Exercise Price		Aggregate Intrinsic Value
Outstanding on January 1	343	$	16.04
Exercised	(224)	$	13.13	$	10,494
Forfeited	—	$	5.86
Outstanding on December 31	119	$	21.57	$	4,571
Exercisable and Vested on December 31	119	$	21.57	$	4,571

Fair Value Assumptions for Performance Awards

The fair values of the senior executives' performance share award grants with a TSR modifier at the grant date in 2021, 2020 and 2019 were $91.44, $64.72 and $49.64, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:


	2021		2020		2019
Risk-free interest rate	0.2	%	1.4	%	2.9	%
Dividend yield	1.2	%	1.5	%	1.7	%
Volatility factor	65.6	%	46.6	%	41.0	%
Expected life of award	2.9 years		2.9 years		2.9 years

Performance Award Activity

Performance award activity for the year ended December 31, 2021 was as follows:


(in thousands, except grant date fair value)	Performance Awards	Weighted Average Grant Date Fair Value ($)
Performance awards, unvested at January 1	212	55.71
Awarded	166	76.89
Forfeited	(1)	87.48
Vested and earned	(185)	53.35
Performance awards, unvested at December 31	192	76.15