Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity from January 1, 2021 to June 30, 2021 follows:

				Weighted
				Average
	Underlying			Exercise Price
	Shares			Per Share
Outstanding at January 1, 2021		4,026,150		$	21.63
Exercised		—		$	—
Expired		(276,000	)	$	31.20
Outstanding at June 30, 2021		3,750,150		$	20.92
Exercisable at June 30, 2021		3,735,150		$	20.93

Restricted Stock Unit Activity

Restricted stock unit activity from January 1, 2021 to June 30, 2021 follows:

						Weighted
						Average Grant
	Time			Performance		Date Fair Value
	Based			Based		Per Share
Non-vested restricted stock units outstanding at January 1, 2021		2,741,548			359,315	$	9.52
Granted		1,797,875			—	$	8.32
Vested		(1,185,049	)		—	$	10.14
Forfeited		(85,572	)		—	$	11.29
Non-vested restricted stock units outstanding at June 30, 2021		3,268,802			359,315	$	8.68

Performance Units

The total target number of shares with respect to the Performance Units for the awards granted in 2017-2021 is set forth below:

	2021		2020		2019		2018		2017
	Performance		Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards		Unit Awards
Target number of shares		843,000		500,500		489,800		310,700		186,198

Fair Value of Performance Units

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

	2021		2020		2019		2018		2017
	Performance		Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards		Unit Awards
Aggregate fair value at date of grant	$	7,225	$	826	$	9,958	$	8,004	$	5,780

Compensation Expense Associated with Performance Units

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

	2021		2020		2019		2018		2017
	Performance		Performance		Performance		Performance		Performance
	Unit Awards		Unit Awards		Unit Awards		Unit Awards		Unit Awards
Three months ended June 30, 2021	$	602	$	69	$	830	NA		NA
Three months ended June 30, 2020	NA		$	69	$	830	$	667	$	161
Six months ended June 30, 2021	$	602	$	138	$	1,660	$	667	NA
Six months ended June 30, 2020	NA		$	69	$	1,660	$	1,334	$	642