Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Stock Option Activity

Stock option activity from January 1, 2022 to March 31, 2022 follows:

			Weighted
			Average
	Underlying		Exercise Price
	Shares		Per Share
Outstanding at January 1, 2022		3,720,150	$	20.93
Exercised		—	$	—
Expired		—	$	—
Outstanding at March 31, 2022		3,720,150	$	20.93
Exercisable at March 31, 2022		3,720,150	$	20.93

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2022 to March 31, 2022 follows:

						Weighted
						Average Grant
	Time			Performance		Date Fair Value
	Based			Based		Per Share
Non-vested restricted stock units outstanding at January 1, 2022		3,044,719			359,315	$	8.31
Granted		109,467			—	$	8.45
Vested		(149,847	)		—	$	7.49
Forfeited		(11,196	)		—	$	9.71
Non-vested restricted stock units outstanding at March 31, 2022		2,993,143			359,315	$	8.35

Performance Units

The total target number of shares with respect to the Performance Units for the awards granted in 2018-2021 is set forth below:

	2021		2020		2019		2018
	Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards
Target number of shares		843,000		500,500		489,800		310,700

Fair Value of Performance Units

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

	2021		2020		2019		2018
	Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards
Aggregate fair value at date of grant	$	7,225	$	826	$	9,958	$	8,004

Compensation Expense Associated with Performance Units

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

	2021		2020		2019		2018
	Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards
Three months ended March 31, 2022	$	602	$	69	$	830	NA
Three months ended March 31, 2021	NA		$	69	$	830	$	667