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Capital Stock - Narrative (Details) - shares | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock authorized (in shares) | 300,000,000 |  |
Preferred stock authorized (in shares) | 30,000,000 |  |
Common stock reserved for exercise and future grants of restricted stock (in shares) | 8,258,768 | 9,643,433 | 10,715,939
Common stock held in revocable trust (in shares) | 489,783 | 489,647 | 489,260
2006 Employee Plan |  |  |
Class of Stock [Line Items] |  |  |
Common shares issuable or transferable (in shares) | 23,700,000 |  |
Cumulative Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock authorized (in shares) | 3,000,000 |  |
Convertible Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock authorized (in shares) | 1,000,000 |  |

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