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Statutory Financial Information (Statutory Net Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
United States [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | $ 196,952 | $ 689,341 | $ 705,908
United Kingdom [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | 116,436 | 35,719 | 56,546
Bermuda [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | 484,417 | (144,239) | 556,275
Germany [Member] |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income (loss) | $ 5,543 | $ (2,471) | $ 1,780

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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