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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$ 32,681	$ (504,812)	$ 281,182	$ (241,318)
Amount allocated to participating common shareholders	(294)	(116)	(2,977)	(344)
Net income (loss) allocated to RenaissanceRe common shareholders	$ 32,387	$ (504,928)	$ 278,205	$ (241,662)
Denominator:
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares)	39,624	39,591	39,606	39,979
Per common share equivalents of employee stock options and restricted shares (in shares)	13	0	21	0
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	39,637	39,591	39,627	39,979
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 0.82	$ (12.75)	$ 7.02	$ (6.04)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ 0.82	$ (12.75)	$ 7.02	$ (6.04)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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