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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | $ 104,253 | $ 86,202
Investment expenses | (4,780) | (4,108)
Net investment income | 99,473 | 82,094
Fixed maturity investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 73,338 | 61,483
Short term investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 12,092 | 11,844
Equity investments |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 1,551 | 1,027
Catastrophe bonds |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 14,139 | 8,691
Other |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | 1,629 | 1,640
Cash and cash equivalents |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Investment income before investment expenses | $ 1,504 | $ 1,517

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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=116637232&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=116637232&loc=SL114874131-224263 + Details
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