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Share-Based Compensation and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of Awarded Restricted Stock Units
The table below presents information pertaining to PRSUs granted in the following periods:
202120202019
PRSUs granted 1
225,206145,39915,066
Monte Carlo grant date fair value 2
$17.74 to $33.31
$2.40 to $16.02
$34.02 
Average grant date fair value 3
$13.63 not applicablenot applicable
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1    The 2020 PRSU grants include one executive officers’ inducement award originally granted in August 2020 that was amended in April 2021 to conform vesting conditions to other PRSU awards granted in 2021.
2    Represents the Monte Carlo grant date fair value of 2021 and 2020 PRSU grants based on the Company’s TSR performance (as defined below).
3    Represents the average grant date fair value of 2021 PRSU grants based on the Company’s ROCE performance (as defined below).
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of Awarded Restricted Stock Units
The following table summarizes activity for our most recent fiscal year with respect to awarded RSUs:
Restricted Stock
Units		Weighted-Average
Grant Date
Fair Value
Balance at beginning of year319,280 $13.56 
Granted120,262 $14.12 
Vested(174,972)$20.81 
Forfeited(34,053)$10.65 
Balance at end of year230,517 $9.20 
Performance Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions The ranges for the assumptions used in the Monte Carlo model for the PRSUs granted during 2021, 2020 and 2019 are presented as follows:
2021 1
2020 1
2019
Expected volatility
131.74% to 134.74%
101.32% to 117.71%
49.90 %
Dividend yield0.0 %0.0 %0.0 %
Risk-free interest rate
0.22% to 0.29%
0.18% to 0.51%
1.66 %
Performance period2021-20232020-20222020-2022
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1    One executive officer’s inducement award originally granted in August 2020 was amended in April 2021 to conform vesting conditions to other PRSU awards granted in 2021. The Monte Carlo assumptions for both years are included above.
Activity of Awarded Performance-based RSUs
The following table summarizes activity for our most recent fiscal year with respect to PRSUs:
Performance Restricted Stock
Units		Weighted-Average Grant Date
Fair Value
Balance at beginning of year173,532 $13.68 
Granted225,206 $22.44 
Vested(9,816)$26.60 
Forfeited(43,853)$14.90 
Balance at end of year345,069 $16.20 
As of December 31, 2021, we had $5.0 million of unrecognized compensation cost attributable to PRSUs. We expect that cost to be recognized over a weighted-average period of 1.96 years.