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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
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Feb. 28, 2023 | Jan. 31, 2023 | May 31, 2022 | Feb. 28, 2022 | May 31, 2021 | Feb. 28, 2021 | May 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | May 31, 2019 | Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2017 | Jan. 31, 2017 | Feb. 29, 2016 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2013
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares tendered by employees to pay employee withholding taxes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,011 | 135,616 | 141,801 |
Nonvested Share Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 161,000 | 212,000 | 350,000 |
Nonvested shares, share units or DEU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.4 | $ 19.5 | $ 18.5 |
Nonvested shares or share units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.7 |  |  |
Expected weighted average period for recognition of expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 2 months 12 days |  |  |
Certain Senior Management | Performance-based share awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, plan modification, incremental cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.0 |  |  |
Total unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4 |  |  |
Expected weighted average period for recognition of expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 months 12 days |  |  |
Time-Based Share Awards | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000 | 93,000 | 69,000 |
Time-Based Share Awards | Nonvested Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 301,495 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Share Awards | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  | 3 years | 3 years |  | 3 years | 3 years | 3 years | 3 years | 3 years |  |  |  |
Time-Based Share Awards | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | First Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Share Awards | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | Second Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Share Awards | Employee | Nonvested Share Units | Incentive Program Bonus Award Fiscal Year Performance | Third Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Share Awards | Director | Nonvested Share Units | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  | 1 year |  | 1 year |  |  | 1 year |  |  |  |  |  |  |  |  |
Time-Based Share Awards | Certain Employees | Nonvested Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 75,581 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compounded Annual Book Value Per Share Growth 16% | Nonvested Shares | Performance Based Grants 2015, 2016, 2017 & 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Time and Performance- Based Share Awards | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 308,000 | 281,000 | 109,000 |
Time and Performance- Based Share Awards | Certain Senior Management | Nonvested Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 394,319 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000
Number of share available for future grant (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  | 3 years |  | 3 years |  |  | 3 years | 3 years | 3 years |  |  |  |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares | First Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares | Second Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares | Third Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Plan | Vesting Based On Performance | Certain Senior Management | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  | 3 years |  | 3 years |  |  | 3 years | 3 years | 3 years |  |  |  |  |  |
2013 Plan | Vesting Based On Performance | Certain Senior Management | Nonvested Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |

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