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Capital Stock - Narrative (Details) - shares | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 900,000,000 |  |
Preferred stock authorized (in shares) | 30,000,000 |  |
Common stock reserved for exercise and future grants of restricted stock (in shares) | 17,939,143 | 19,135,222 | 21,007,911
Common stock held in revocable trust (in shares) | 1,426,883 | 1,426,883 | 1,469,712
2006 Employee Plan |  |  |
Class of Stock [Line Items] |  |  |
Common shares issuable or transferable (in shares) | 71,100,000 |  |
Cumulative Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock authorized (in shares) | 3,000,000 |  |

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