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Earnings Per Share (Computation of Basic and Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income available to RenaissanceRe common shareholders | $ 189,812 | $ 47,799 | $ 575,845 | $ (81,974) | $ 33,773 | $ 36,698 | $ 367,854 | $ 273,717 | $ 731,482 | $ 712,042 | $ 197,276
Amount allocated to participating common shareholders |  |  |  |  |  |  |  |  | (8,968) | (8,545) | (2,121)
Net income allocated to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | $ 722,514 | $ 703,497 | $ 195,155
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) | 50,022 | 50,009 | 44,939 | 43,441 | 43,467 | 43,462 | 43,483 | 42,065 | 47,103 | 43,119 | 39,732
Per common share equivalents of non-vested shares (in shares) |  |  |  |  |  |  |  |  | 75 | 56 | 23
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) | 50,111 | 50,094 | 45,003 | 43,441 | 43,552 | 43,537 | 43,521 | 42,091 | 47,178 | 43,175 | 39,755
Net income available to RenaissanceRe common shareholders per common share – basic (in usd per share) | $ 3.75 | $ 0.94 | $ 12.64 | $ (1.89) | $ 0.77 | $ 0.83 | $ 8.36 | $ 6.43 | $ 15.34 | $ 16.32 | $ 4.91
Net income available to RenaissanceRe common shareholders per common share – diluted (in usd per share) | $ 3.74 | $ 0.94 | $ 12.63 | $ (1.89) | $ 0.77 | $ 0.83 | $ 8.35 | $ 6.43 | $ 15.31 | $ 16.29 | $ 4.91

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