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Income Taxes - Uncertain tax positions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in unrecognized tax benefits |  |  |  |
Balance as of January 1 | $ 34,016 | $ 34,016 | $ 45,452 | $ 45,988
Additions for tax positions of prior years |  | 322 | 2,207 | 806
Reductions for tax positions of prior years |  | (1,046) | (256) | (1,342)
Settlements | (10,000) | (9,968) | (13,387) |
Balance as of December 31 |  | 23,324 | 34,016 | 45,452
Unrecognized tax benefits that would impact the worldwide effective tax rate if realized |  | 23,300 |  |
Interest and penalties on unrecognized tax benefits |  | 8,200 | 11,100 | 17,000
Accruals for estimated interest and penalties related to uncertain tax positions |  | (2,900) | (6,000) | $ 2,600
Interest and penalties accrued | $ 1,800 |  |  |
Valuation allowance |  | 3,825,551 | $ 3,962,200 |
Bermuda |  |  |  |
Change in unrecognized tax benefits |  |  |  |
Deferred tax asset for Bermuda net operating losses |  | 206,900 |  |
Valuation allowance |  | $ 206,900 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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