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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | $ 83,368 | $ 104,253
Investment expenses | (3,564) | (4,780)
Net investment income | 79,804 | 99,473
Fixed maturity investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 62,933 | 73,338
Short term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 573 | 12,092
Equity investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 1,491 | 1,551
Catastrophe bonds |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 14,468 | 14,139
Other |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 3,801 | 1,629
Cash and cash equivalents |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | $ 102 | $ 1,504

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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