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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Acceleration of share-based payment arrangement | $ 500 | $ 2,900 | $ 2,600 | $ 12,400 |
Unrecognized compensation cost | $ 76,800 |  | $ 76,800 |  |
Compensation recognition period (in years) |  |  | 3 years |  |
Stock options granted (in shares) |  |  | 177,168 |  |
Exercised (in shares) |  |  | 178,511 |  |
Stock options forfeited (in shares) |  |  | 45,315 |  |
Stock options outstanding (in shares) | 3,117,825 |  | 3,117,825 |  | 3,164,483
Share-based compensation expense | $ 9,515 | 13,741 | $ 31,309 | 44,597 |
Non-Management Trustee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) |  |  | 60,000 |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period (in years) |  |  | 10 years |  |
Share-based compensation expense | $ 3,600 | 4,200 | $ 11,300 | 15,800 |
Performance Target, Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) |  |  | 117,168 |  |
Award performance period |  |  | 3 years |  |
Percentage of target options originally granted (as percent) | 200.00% |  | 200.00% |  |
Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ 6,300 | $ 9,700 | $ 21,100 | $ 30,600 |
Grants in period (in shares) |  |  | 42,452 |  |
Forfeited in period (in shares) |  |  | 30,148 |  |
Vested (in shares) |  |  | 77,400 |  |
Employee stock-based compensation and exercise of stock options (in shares) |  |  | 55,595 |  |
Restricted share units outstanding (in shares) | 410,951 |  | 410,951 |  | 476,047
Performance Target, Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award performance period |  |  | 3 years |  |
Grants in period (in shares) |  |  | 37,211 |  |
Percentage of target options originally granted (percentage) | 200.00% |  | 200.00% |  |
Service-Based Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) |  |  | 5,241 |  |
Deferred Stock Units (DSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) |  |  | 1,590 |  |
Restricted share units outstanding (in shares) | 10,274 |  | 10,274 |  | 9,551
Granted DSUs (in shares) |  |  | 867 |  |
Unrestricted Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) |  |  | 674 |  |
Minimum | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |
Minimum | Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  | 5 years |  |
Maximum | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  | 5 years |  |
Maximum | Restricted Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period (in years) |  |  | 8 years |  |

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