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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Restricted Stock Unit and Stock Option Activity
The following table summarizes restricted stock unit, stock option and CPSU activity:
Restricted Stock UnitsStock OptionsCPSUs
NumberWeighted-
Average
Grant Date
Fair Value
Per Share
NumberWeighted-
Average
Exercise/
(Strike) Price
Per Share
NumberWeighted-
Average Grant Date
Fair Value
Per Unit
Outstanding as of December 31, 20191,715,000 $25.19 2,279,015 $20.62 — $— 
Granted245,000 20.67 165,000 19.24 — — 
Expired or cancelled(403,750)25.52 (168,750)25.87 — — 
Vested/exercised(521,250)29.44 — — — — 
Outstanding as of December 31, 20201,035,000 $21.85 2,275,265 $20.13 — $— 
Granted678,851 16.26 100,000 19.24 398,852 20.39 
Expired or cancelled(155,000)15.37 (202,500)20.07 — — 
Vested/exercised(370,000)23.53 (5,000)13.32 — — 
Outstanding as of December 31, 20211,188,851 $18.98 2,167,765 $20.11 398,852 $20.39 
Granted375,769 10.53 — — 415,768 12.99 
Expired or cancelled(42,500)19.27 (542,500)11.66 — — 
Vested/exercised(415,450)20.14 — — — — 
Outstanding as of December 31, 20221,106,670 $15.66 1,625,265 $22.93 814,620 $16.61 
Vested and expected to vest at December 31, 2022
1,011,670 $15.27 1,530,265 $23.31 100,000 $6.99 
Summary of Unrestricted Stock Units Issuance
The following table summarizes unrestricted stock awards, which are generally issued to the non-employee members of the Company’s Board of Directors as part of their annual retainer fees:
Unrestricted Stock Awards
YearNumberWeighted-Average
Grant Date
Fair Value Per Share
2020194,177 $8.60 
2021101,894 15.47 
2022165,030 10.63 
Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards The fair value on the grant date and the significant assumptions used in the Black-Scholes option-pricing model for grants made in the years ended December 31, 2021 and 2020 are as follows:
Year Ended December 31,
20212020
Total stock options granted100,000 165,000 
Weighted-average grant date fair value$15.21 $7.67 
Weighted-average assumptions:
Risk-free rate1.4 %1.2 %
Expected life of options(a)
6.5 years6.3 years
Expected volatility(b)
73.7 %60.7 %
Expected quarterly dividends$— $— 
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(a)Calculated using the simplified method due to the terms of the stock options and the limited pool of grantees.
(b)Calculated using historical volatility of the Company’s common stock over periods commensurate with the expected life of the option.