Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income (loss)
Net income (loss)	$ 950,267	$ 268,917	$ (354,671)
Change in net unrealized gains on investments, net of tax	2,173	(1,657)	(909)
Foreign currency translation adjustments, net of tax	(2,679)	0	0
Comprehensive income (loss)	949,761	267,260	(355,580)
Net (income) loss attributable to redeemable noncontrolling interests	(201,469)	(41,553)	132,282
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(201,469)	(41,553)	132,282
Comprehensive income (loss) attributable to RenaissanceRe	748,292	225,707	(223,298)
Disclosure regarding net unrealized gains (losses)
Total net realized and unrealized holding gains (losses) on investments	2,173	(1,657)	(909)
Change in net unrealized (losses) gains on investments	$ 2,173	$ (1,657)	$ (909)