Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Gross premiums written	$ 640,269	$ 430,224	$ 2,389,774	$ 2,051,485
Net premiums written	483,221	284,222	1,583,102	1,315,813
Decrease (increase) in unearned premiums	64,571	62,299	(287,000)	(264,284)
Net premiums earned	547,792	346,521	1,296,102	1,051,529
Net investment income	40,257	51,423	148,745	134,410
Net foreign exchange (losses) gains	(156)	(5,986)	11,118	(8,368)
Equity in earnings (losses) of other ventures	1,794	(11,630)	5,830	(3,997)
Other income	2,996	2,268	7,053	9,001
Net realized and unrealized gains on investments	42,052	59,870	143,538	191,295
Total revenues	634,735	442,466	1,612,386	1,373,870
Expenses
Net claims and claim expenses incurred	1,221,696	112,575	1,557,364	406,930
Acquisition expenses	76,761	80,580	248,294	215,177
Operational expenses	42,537	40,493	131,586	147,801
Corporate expenses	4,413	11,537	14,335	25,514
Interest expense	11,799	10,536	32,416	31,610
Total expenses	1,357,206	255,721	1,983,995	827,032
(Loss) income before taxes	(722,471)	186,745	(371,609)	546,838
Income tax benefit (expense)	18,977	1,316	14,739	(8,040)
Net (loss) income	(703,494)	188,061	(356,870)	538,798
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Net (loss) income attributable to RenaissanceRe	(499,217)	152,420	(224,532)	427,931
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders	$ (504,812)	$ 146,825	$ (241,318)	$ 411,145
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ (12.75)	$ 3.58	$ (6.04)	$ 9.77
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	(12.75)	3.56	(6.04)	9.71
Dividends per common share (in dollars per share)	$ 0.32	$ 0.31	$ 0.96	$ 0.93