At June 30, 2022, we had five active stock-based compensation plans: the Non-Employee Directors’ Stock Retirement Plan (“Directors’ Plan”), the 2004 Omnibus Long-Term Incentive Plan (“2004 Plan”), the 2009 Omnibus Equity and Performance Incentive Plan (“2009 Plan”), the 2014 Performance and Incentive Compensation Plan (“2014 Plan”), and the 2018 Equity and Incentive Compensation Plan ("2018 Plan"). Future grants can only be made under the 2018 Plan.

These plans allow for grants of stock options, stock appreciation rights, restricted stock, restricted stock units ("RSUs"), performance shares, performance units, and other stock awards subject to the terms of the specific plans under which the awards are granted.

The following table summarizes the compensation expense included in selling, general and administrative expenses in the Condensed Consolidated Statements of Earnings related to stock-based compensation plans:


	Three months ended				Six months ended
	June 30,		June 30,		June 30,		June 30,
	2022		2021		2022		2021
Service-based RSUs	$	691	$	738	$	1,368	$	1,425
Performance-based RSUs		820		1,066		2,041		1,559
Cash-settled RSUs		105		99		157		138
Total	$	1,616	$	1,903	$	3,566	$	3,122
Income tax benefit		372		438		820		718
Net expense	$	1,244	$	1,465	$	2,746	$	2,404

The following table summarizes the unrecognized compensation expense related to non-vested RSUs by type and the weighted-average period in which the expense is to be recognized:


	Unrecognized
	Compensation		Weighted-
	Expense at		Average
	June 30, 2022		Period (years)
Service-based RSUs	$	2,711		1.44
Performance-based RSUs		5,117		1.89
Total	$	7,828		1.73

We recognize expense on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards.

The following table summarizes the status of these plans as of June 30, 2022:


	2018 Plan		2014 Plan		2009 Plan		2004 Plan		Directors' Plan
Awards originally available		2,500,000		1,500,000		3,400,000		6,500,000	N/A
Maximum potential awards outstanding		716,826		35,100		45,200		14,545		4,722
RSUs and cash settled awards vested and released		117,828		—		—		—		—
Awards available for grant		1,665,346		—		—		—		—

The following table summarizes the service-based RSU activity for the three months ended June 30, 2022:


	Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		283,216		$	24.91
Granted		68,124			33.70
Vested and released		(58,144	)		29.96
Forfeited		(7,838	)		30.35
Outstanding at June 30, 2022		285,358		$	25.83
Releasable at June 30, 2022		132,834		$	17.55

The following table summarizes the performance and market-based RSU activity for the three months ended June 30, 2022:


	Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		237,767		$	31.35
Granted		81,702			37.15
Attained by performance		5,136			29.50
Released		(51,848	)		30.64
Forfeited		(14,351	)		32.62
Outstanding at June 30, 2022		258,406		$	33.20
Releasable at June 30, 2022		—		$	—

Cash-Settled RSUs entitle the holder to receive the cash equivalent of one share of common stock for each unit when the unit vests. These RSUs are issued to key employees residing in foreign locations as direct compensation. Generally, these RSUs vest over a three-year period. Cash-Settled RSUs are classified as liabilities and are remeasured at each reporting date until settled. At June 30, 2022 and December 31, 2021, we had 46,524 and 32,085 cash-settled RSUs outstanding, respectively. At June 30, 2022 and December 31, 2021, liabilities of $299 and $400, respectively, were included in accrued expenses and other liabilities on our Condensed Consolidated Balance Sheets.