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Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Stock option activity from January 1, 2024 to June 30, 2024 follows:


	Underlying Shares	Weighted Average Exercise Price Per Share
Outstanding at January 1, 2024	2,865,223	$	23.36


Exercised	—	$	—
Expired	(654,825)	$	28.87
Outstanding at June 30, 2024	2,210,398	$	21.72
Exercisable at June 30, 2024	2,210,398	$	21.72

Restricted stock unit activity from January 1, 2024 to June 30, 2024 follows:


	Time Based	Performance Based	Weighted Average Grant Date Fair Value Per Share
Non-vested restricted stock units outstanding at January 1, 2024	5,827,668	521,533	$	10.60
Granted	3,082,101	—	$	10.51

Vested	(3,010,149)	—	$	9.05
Forfeited	(47,135)	—	$	12.33
Non-vested restricted stock units outstanding at June 30, 2024	5,852,485	521,533	$	11.28

The total target number of shares granted with respect to the Performance Units for the awards granted in 2020-2024 is set forth below:

The fair value of the Performance Units is set forth below (in thousands):


	2024 Performance Unit Awards		2023 Performance Unit Awards		2022 Performance Unit Awards		2021 Performance Unit Awards		2020 Performance Unit Awards
Aggregate fair value at date of grant	$	10,904	$	8,440	$	10,743	$	7,225	$	826

Compensation expense associated with the Performance Units is shown below (in thousands):