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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of restricted stock, restricted stock unit and stock option activity | The following table summarizes RSU and stock option activity:
| RSUs | Stock Options
| Number | Weighted Average Grant Date Fair Value Per Share | Number | Weighted Average Exercise Price Per Share
Outstanding as of December 31, 2019 | 1,660,311 |  | $39.88 | 5,381,477 |  | $52.13
Granted | 1,355,975 |  | 10.30 | 975,290 |  | 11.06
Forfeited or expired | (114,352) |  | 33.74 | (603,835) |  | 59.46
Vested/exercised | (643,340) |  | 42.23 | — |  | —
Outstanding as of December 31, 2020 | 2,258,594 |  | $21.76 | 5,752,932 |  | $44.40
Granted | 596,391 |  | 18.67 | 481,626 |  | 17.96
Forfeited or expired | (132,713) |  | 18.78 | (659,216) |  | 58.37
Vested/exercised | (810,560) |  | 30.83 | (84,416) |  | 8.81
Outstanding as of December 31, 2021 | 1,911,712 |  | $17.16 | 5,490,926 |  | $40.95
Granted | 415,356 |  | 22.36 | 250,656 |  | 21.90
Forfeited or expired | (2,937) |  | 25.55 | (846,621) |  | 61.46
Vested/exercised | (957,640) |  | 22.01 | (217,397) |  | 15.20
Outstanding as of December 31, 2022 | 1,366,491 |  | $15.33 | 4,677,564 |  | $37.41
Options exercisable as of December 31, 2022 |  |  | 3,689,284 |  | $43.03
Remaining unvested options outstanding and expected to vest |  |  | 978,397 |  | $16.46
During the first quarter of 2022, the following units were granted (under GAAP) based upon the establishment of performance targets:
| Performance-based Award Units Granted in 2022 | Weighted Average Grant Date Fair Value Per Share
2022 Performance Award Plan | 142,319 | $24.07
2021 Performance Award Plan | 204,623 | $25.75
2020 Performance Award Plan | 385,455 | $27.90
Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model | The grant date fair value of options and other significant assumptions follow:
| 2022 | 2021 | January 1 - November 30, 2020 | December 31, 2020
Weighted average grant date fair value | $11.19 | $8.94 | $4.59 | $9.05
Expected life of options (in years) | 4.5 | 4.5 | 4.6 | 7.2
Risk-free interest rate | 1.9 | % | 0.7 | % | 0.4 | % | 0.5 | %
Expected volatility | 62 | % | 62 | % | 65 | % | 61 | %
Expected annual dividend per share | $0.00 | $0.00 | $0.00 | $0.00
Summary of information related to options outstanding | Information related to options outstanding as of December 31, 2022 follows:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share |  | Number Exercisable | Weighted Average Remaining Contractual Life (In Years) | Weighted Average Exercise Price Per Share
$8.81 - $29.50 | 2,431,911 |  | 7.6 | $ | 18.29 |  |  | 1,443,631 |  | 7.1 | $ | 19.54 |
$46.07 - $62.50 | 1,986,231 |  | 3.1 | 55.37 |  |  | 1,986,231 |  | 3.1 | 55.37 |
$70.76 - $79.19 | 259,422 |  | 1.1 | 79.19 |  |  | 259,422 |  | 1.1 | 79.19 |
| 4,677,564 |  | 5.3 | $ | 37.41 |  |  | 3,689,284 |  | 4.5 | $ | 43.03 |
Disclosure of compensation Arrangements by share-based payment award |
|  | Location in Statement of Operations |  | December 31,
Compensation Expense (in millions) |  |  | 2022 |  | 2021 |  | 2020
SGI awards |  | G&A |  | $ | 54 |  |  | $ | 67 |  |  | $ | 25 |
Performance-based awards for non-Section 16 executives |  | G&A |  | 14 |  |  | 1 |  |  | 3 |
Liabilities (in millions) |  | Location on Balance Sheet | December 31, 2022 |  | December 31, 2021
SGI awards |  | Accrued salaries, wages and benefits and Other noncurrent liabilities | $ | 92 |  |  | $ | 73 |
Performance-based awards for non-Section 16 executives |  | Accrued salaries, wages and benefits and Other noncurrent liabilities | 15 |  |  | 8 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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