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Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 11 Months Ended | 32 Months Ended | 116 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021
2004 plan |  |  |  |
Additional disclosures |  |  |  |
Granted (in shares) |  |  |  | 0
2012 plan |  |  |  |
Additional disclosures |  |  |  |
Granted (in shares) |  |  | 0 |
2019 plan |  |  |  |
Additional disclosures |  |  |  |
Granted (in shares) |  | 0 |  |
2020 plan |  |  |  |
Share-Based Compensation |  |  |  |
Number of shares registered | 2,072,245 | 2,072,245 | 2,072,245 | 2,072,245
Stock Options |  |  |  |
Share-Based Compensation |  |  |  |
Vesting percentage | 25.00% |  |  |
Vesting period | 4 years |  |  |
Expiration period | 10 years |  |  |
Number of shares |  |  |  |
Outstanding at the beginning of the period (in shares) | 256,425 |  |  |
Exercised (in shares) | (51,620) |  |  |
Forfeited (in shares) | (6,107) |  |  |
Outstanding at the end of the period (in shares) | 198,698 | 198,698 | 198,698 | 198,698
Exercisable at the end of the period (in shares) | 198,698 | 198,698 | 198,698 | 198,698
Weighted-Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 59.01 |  |  |
Exercised (in dollars per share) | 46.13 |  |  |
Forfeited (in dollars per share) | 86.45 |  |  |
Outstanding at the end of the period (in dollars per share) | 61.52 | $ 61.52 | $ 61.52 | $ 61.52
Exercisable at the end of the period (in dollars per share) | $ 61.52 | $ 61.52 | $ 61.52 | $ 61.52
Weighted-Average Remaining Contractual Life |  |  |  |
Outstanding at the end of the period | 4 years 25 days |  |  |
Exercisable at the end of the period | 4 years 25 days |  |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding at the end of the period | $ 3,554 | $ 3,554 | $ 3,554 | $ 3,554
Exercisable at the end of the period | $ 3,554 | 3,554 | 3,554 | 3,554
Additional disclosures |  |  |  |
Granted (in shares) | 0 |  |  |
Total unrecognized compensation cost related to non vested stock option grants | $ 0 | $ 0 | $ 0 | $ 0
Intrinsic value of stock option shares exercised | $ 1,900 |  |  |

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