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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
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Jan. 01, 2023 | Jan. 01, 2022 | Jan. 01, 2021 | Feb. 28, 2024 | May 31, 2023 | 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 | Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2017 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2013
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares tendered by employees to pay employee withholding taxes (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,334 | 133,011 | 135,616 |
Performance-based share awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 3 years |
Nonvested Share Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 567,000 | 161,000 | 212,000 |
Nonvested shares, share units or DEU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.3 | $ 18.4 | $ 19.5 |
Nonvested shares or share units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.9 |  |  |
Expected weighted average period for recognition of expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 6 months |  |  |
Certain Senior Management | Performance-based share awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.0 |  |  |
Time-Based Share Awards | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 | 87,000 | 93,000 |
Time-Based Share Awards | Nonvested Share Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 46,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
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% |  |  |  |  |  |  | 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% |  |  |  |  |  |  | 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% |  |  |  |  |  |  | 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 Share Units | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 61,788 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compounded Annual Book Value Per Share Growth | Nonvested Shares | Performance Based Grants 2018, 2019 and 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Time and Performance- Based Share Awards | Nonvested Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 308,000 | 281,000 |
Time and Performance- Based Share Awards | Certain Senior Management | Nonvested Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 296,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time and Performance- Based Share Awards | Certain Senior Management | Nonvested Share Units | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 66,547 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000
Number of share available for future grant (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |
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 | 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% |  | 33.33% | 33.33% |  | 33.33% |  |  |  |  |  |  |  |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares | Second Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  | 33.33% | 33.33% |  | 33.33% |  |  |  |  |  |  |  |  |  |
2013 Plan | Time-Based Share Awards | Certain Senior Management | Nonvested Shares | Third Vesting Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 33.33% |  | 33.33% | 33.33% |  | 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 | 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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- Definition Represents the period over which a performance condition to the award is measured, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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