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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 441,478 | $ 276,780 | $ 237,596
Investment expenses |  |  |  |  |  |  |  |  | (17,645) | (14,914) | (15,387)
Net investment income | $ 112,695 | $ 113,844 | $ 115,832 | $ 81,462 | $ 53,338 | $ 80,696 | $ 71,356 | $ 56,476 | 423,833 | 261,866 | 222,209
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 318,503 | 211,973 | 179,624
Short term investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 56,264 | 33,571 | 11,082
Equity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 4,808 | 4,474 | 3,628
Private equity investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 14,981 | 477 | 33,999
Other |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 39,246 | 22,475 | 8,067
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 7,676 | $ 3,810 | $ 1,196

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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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