At March 31, 2024, 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 or allowed (as applicable) 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
	March 31,		March 31,
	2024		2023
Service-based RSUs	$	894	$	770
Performance-based RSUs		154		634
Cash-settled RSUs		173		182
Total	$	1,221	$	1,586
Income tax benefit		279		365
Net expense	$	942	$	1,221

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


	Unrecognized
	Compensation		Weighted-
	Expense at		Average
	March 31, 2024		Period (years)
Service-based RSUs	$	5,049		1.63
Performance-based RSUs		4,653		2.26
Total	$	9,702		1.93

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 March 31, 2024:


	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		720,123		35,100		30,000		14,545		4,722
RSUs and cash-settled awards vested and released		620,116		—		—		—		—
Awards available for grant		1,159,761		—		—		—		—

The following table summarizes the service-based RSU activity for the three months ended March 31, 2024:


	Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2023		280,966		$	30.36
Granted		86,240			43.19
Vested and released		(54,372	)		37.21
Forfeited		(2,648	)		41.74
Outstanding at March 31, 2024		310,186		$	32.63
Releasable at March 31, 2024		141,167		$	21.76

The following table summarizes the performance-based RSU activity for the three months ended March 31, 2024:


	Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2023		220,656		$	36.96
Granted		72,549			43.49
Attained by performance		55,272			33.37
Released		(112,907	)		33.85
Forfeited		(7,297	)		34.77
Outstanding at March 31, 2024		228,273		$	39.86
Releasable at March 31, 2024		—		$	—

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 March 31, 2024 and December 31, 2023, we had 48,372 and 42,062 Cash-Settled RSUs outstanding, respectively. At March 31, 2024 and December 31, 2023, liabilities of $581 and $676, respectively, were included in accrued expenses and other liabilities on our Condensed Consolidated Balance Sheets.