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Share-Based Compensation and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2022
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:
2022202120202019
PRSUs granted 1
180,217225,206145,39915,066
Monte Carlo grant date fair value 2
$60.60 to $74.92
$17.74 to $33.31
$2.40 $34.02 
Average grant date fair value 3
$34.68 $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 PRSU grants based on the Company’s TSR performance (as defined below).
3    Represents the average grant date fair value of 2022 and 2021 PRSU grants based on the Company’s ROCE performance (as defined below).
The following table summarizes activity for our most recent fiscal year with respect to awarded PRSUs:
Performance Restricted Stock UnitsWeighted-Average Grant Date Fair Value
Balance at January 1, 2022345,069 $16.20 
Granted180,217 $47.77 
Vested(68,190)$10.12 
Change in units based on performance 1
(4,494)$7.01 
Forfeited(12,502)$21.47 
Balance at December 31, 2022
440,100 $29.87 
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1    PRSUs granted in 2020 and 2019 are granted at a target of 100% but can vest from a range of 0% to 200% of the original grant based on performance as described above. Amount represents difference between original grant amount and amounts ultimately earned.
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:
Time-Vested Restricted Stock
Units		Weighted-Average
Grant Date
Fair Value
Balance at January 1, 2022230,517 $9.20 
Granted49,314 $35.07 
Vested(112,509)$10.03 
Forfeited(17,451)$12.77 
Balance at December 31, 2022
149,871 $17.51 
Performance Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Valuation Assumptions The table below presents ranges for the assumptions used in the Monte Carlo model for the PRSUs granted in the following periods:
2022
2021 1
2020 1
2019
Expected volatility
134.98% to 138.75%
131.74% to 134.74%
101.32% to 117.71%
49.90 %
Dividend yield0.0 %0.0 %0.0 %0.0 %
Risk-free interest rate
2.59%
0.22% to 0.29%
0.18% to 0.51%
1.66 %
Performance period2022-20242021-20232020-20222020-2022
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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.