Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Stock-based Compensation

Summary of changes in, the Company's stock option awards

The Company has outstanding stock options assumed from acquisitions.  A summary of the status of, and changes in, the Company's stock option awards for the three months ended March 31, 2022, follows:

					Weighted-
			Weighted-		Average
			Average		Remaining
			Exercise		Contractual
	Shares		Price		Life
Outstanding at January 1, 2022		31,386	$	23.53		4.88
Exercised		—		—
Forfeited		—		—
Expired		(220)		23.53
Outstanding at March 31, 2022		31,166	$	23.53		4.63
Exercisable at March 31, 2022		31,166	$	23.53		4.63

Summary of changes in the Company's RSU, PSU, and DSU awards

A summary of changes in the Company’s RSU, PSU, and DSU awards for the three months ended March 31, 2022, is as follows:

	RSU Awards				PSU Awards				DSU Awards
			Weighted-				Weighted-				Weighted-
			Average				Average				Average
			Grant Date				Grant Date				Grant Date
	Shares		Fair Value		Shares (1)		Fair Value		Shares		Fair Value
Nonvested at January 1, 2022		1,147,927	$	23.97		113,915	$	22.86		34,135	$	24.59
Granted		156,483		25.79		195,240		25.79		32,658		25.79
Dividend equivalents earned		9,671		27.30		—		—		1,107		27.30
Vested		(13,594)		29.73		—		—		(32,801)		24.63
Forfeited		(10,298)		24.05		(585)		23.48		—		—
Nonvested at March 31, 2022		1,290,189	$	24.16		308,570	$	24.71		35,099	$	25.75
Vested and outstanding at March 31, 2022										130,098	$	22.68

(1) Shares for PSU awards represent target shares at grant date.

Schedule of Stock-based compensation expense

The Company recognized compensation expense related to nonvested RSU, PSU, and DSU awards, as well as the 2021 ESPP, as summarized in the table below (dollars in thousands):

	Three Months Ended March 31,
	2022		2021
Stock-based compensation expense
RSU awards	$	1,176	$	1,230
PSU awards		412		60
DSU awards		226		158
2021 ESPP		95		—
Total stock-based compensation expense	$	1,909	$	1,448

Schedule of Unamortized stock-based compensation expense

Unamortized compensation expense related to nonvested RSU, PSU, and DSU awards is summarized in the table below (dollars in thousands):

	As of
	March 31,			December 31,
	2022			2021
Unamortized stock-based compensation
RSU awards	$	12,838		$	10,204
PSU awards		5,544			1,547
DSU awards		825			209
Total unamortized stock-based compensation	$	19,207		$	11,960
Weighted average period over which expense is to be recognized		2.9	yrs		2.9	yrs

Schedule of shares remaining available for issuance pursuant to authorized plans

Shares remaining available for issuance pursuant to authorized stock-based compensation plans as of March 31, 2022, were as follows:

	Shares Remaining
	Available for Issuance
	Pursuant to the Plan
2020 Equity Plan		643,569
2021 Employee Stock Purchase Plan		544,470