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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

The following table summarizes the Company's SARs activity during 2021:


(Shares in thousands)	Number of SARs	Weighted- average Exercise Price Per Share		Aggregate Intrinsic Value (thousands)		Weighted- average Remaining Term (Years)
Outstanding at December 31, 2020	254	$	46.18
Granted	53	68.82
Exercised	(44)	41.02
Cancelled	(3)	54.61
Outstanding at December 31, 2021	260	51.55		$	10,487	4.0
Vested and expected to vest as of December 31, 2021	260	51.55		10,487		4.0
Exercisable at December 31, 2021	160	45.41		7,277		3.1

A summary of the status and changes of shares subject to SARs and the related average price per share follows:


(Shares in thousands)	Number of SARs	Weighted- average Grant Date Fair Value
Nonvested as of December 31, 2020	106	$	15.46
Granted	53	20.66
Vested	(55)	15.80
Cancelled	(4)	16.53
Nonvested as of December 31, 2021	100	$	17.97

The fair value of the SARs was estimated on the grant date using the Black-Scholes pricing model with the following assumptions:

The following table summarizes the stock-settled RSU activity during 2021:


(Shares in thousands)	Number of Shares	Weighted- average Grant Date Fair Value
Outstanding at December 31, 2020	161	$	53.50
Granted	59	68.62
Vested	(40)	51.14
Forfeited	(18)	56.85
Outstanding at December 31, 2021	162	$	59.23

The following table summarizes the activity related to performance-based RSUs during 2021:


(Shares in thousands)	Number of Shares	Weighted- average Grant Date Fair Value
Outstanding at December 31, 2020	126	$	63.61
Granted	41	83.78
Vested	(43)	50.35
Forfeited	(5)	69.00
Outstanding at December 31, 2021	119	$	70.77