Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting, Measurement Disclosures [Abstract]

Schedule of Significant Components of the Company's Revenues and Expenses

A summary of the significant components of the Company’s revenues and expenses by segment is as follows:

Year ended December 31, 2018	Property			Casualty and Specialty			Other			Total
Gross premiums written	$	1,760,926		$	1,549,501		$	—		$	3,310,427
Net premiums written	$	1,055,188		$	1,076,714		$	—		$	2,131,902
Net premiums earned	$	1,050,831		$	925,298		$	—		$	1,976,129
Net claims and claim expenses incurred	497,895			622,320			(197		)	1,120,018
Acquisition expenses	177,912			255,079			(2		)	432,989
Operational expenses	112,954			64,883			430			178,267
Underwriting income (loss)	$	262,070		$	(16,984	)	$	(231	)	244,855
Net investment income							261,866			261,866
Net foreign exchange losses							(12,428		)	(12,428		)
Equity in earnings of other ventures							18,474			18,474
Other income							5,969			5,969
Net realized and unrealized losses on investments							(175,069		)	(175,069		)
Corporate expenses							(33,983		)	(33,983		)
Interest expense							(47,069		)	(47,069		)
Income before taxes and redeemable noncontrolling interests										262,615
Income tax benefit							6,302			6,302
Net income attributable to redeemable noncontrolling interests							(41,553		)	(41,553		)
Dividends on preference shares							(30,088		)	(30,088		)
Net income available to RenaissanceRe common shareholders										$	197,276
Net claims and claim expenses incurred – current accident year	$	719,185		$	671,582		$	—		$	1,390,767
Net claims and claim expenses incurred – prior accident years	(221,290		)	(49,262		)	(197		)	(270,749		)
Net claims and claim expenses incurred – total	$	497,895		$	622,320		$	(197	)	$	1,120,018
Net claims and claim expense ratio – current accident year	68.4		%	72.6		%				70.4		%
Net claims and claim expense ratio – prior accident years	(21.0		)%	(5.3		)%				(13.7		)%
Net claims and claim expense ratio – calendar year	47.4		%	67.3		%				56.7		%
Underwriting expense ratio	27.7		%	34.5		%				30.9		%
Combined ratio	75.1		%	101.8		%				87.6		%

Year ended December 31, 2017	Property			Casualty and Specialty			Other			Total
Gross premiums written	$	1,440,437		$	1,357,110		$	(7	)	$	2,797,540
Net premiums written	$	978,014		$	893,307		$	4		$	1,871,325
Net premiums earned	$	931,070		$	786,501		$	4		$	1,717,575
Net claims and claim expenses incurred	1,297,985			565,026			(1,583		)	1,861,428
Acquisition expenses	113,816			233,077			(1		)	346,892
Operational expenses	94,194			66,548			36			160,778
Underwriting (loss) income	$	(574,925	)	$	(78,150	)	$	1,552		(651,523		)
Net investment income							222,209			222,209
Net foreign exchange gains							10,628			10,628
Equity in earnings of other ventures							8,030			8,030
Other income							9,415			9,415
Net realized and unrealized gains on investments							135,822			135,822
Corporate expenses							(18,572		)	(18,572		)
Interest expense							(44,193		)	(44,193		)
Loss before taxes and noncontrolling interests										(328,184		)
Income tax expense							(26,487		)	(26,487		)
Net loss attributable to noncontrolling interests							132,282			132,282
Dividends on preference shares							(22,381		)	(22,381		)
Net loss attributable to RenaissanceRe common shareholders										$	(244,770	)
Net claims and claim expenses incurred – current accident year	$	1,343,581		$	558,843		$	—		$	1,902,424
Net claims and claim expenses incurred – prior accident years	(45,596		)	6,183			(1,583		)	(40,996		)
Net claims and claim expenses incurred – total	$	1,297,985		$	565,026		$	(1,583	)	$	1,861,428
Net claims and claim expense ratio – current accident year	144.3		%	71.1		%				110.8		%
Net claims and claim expense ratio – prior accident years	(4.9		)%	0.7		%				(2.4		)%
Net claims and claim expense ratio – calendar year	139.4		%	71.8		%				108.4		%
Underwriting expense ratio	22.3		%	38.1		%				29.5		%
Combined ratio	161.7		%	109.9		%				137.9		%

Year ended December 31, 2016	Property			Casualty and Specialty			Other			Total
Gross premiums written	$	1,111,263		$	1,263,313		$	—		$	2,374,576
Net premiums written	$	725,321		$	809,848		$	143		$	1,535,312
Net premiums earned	$	720,951		$	682,337		$	142		$	1,403,430
Net claims and claim expenses incurred	151,545			380,396			(1,110		)	530,831
Acquisition expenses	97,594			191,729			—			289,323
Operational expenses	108,642			88,984			123			197,749
Underwriting income	$	363,170		$	21,228		$	1,129		385,527
Net investment income							181,726			181,726
Net foreign exchange losses							(13,788		)	(13,788		)
Equity in earnings of other ventures							963			963
Other income							14,178			14,178
Net realized and unrealized gains on investments							141,328			141,328
Corporate expenses							(37,402		)	(37,402		)
Interest expense							(42,144		)	(42,144		)
Income before taxes and noncontrolling interests										630,388
Income tax expense							(340		)	(340		)
Net income attributable to noncontrolling interests							(127,086		)	(127,086		)
Dividends on preference shares							(22,381		)	(22,381		)
Net income available to RenaissanceRe common shareholders										$	480,581
Net claims and claim expenses incurred – current accident year	$	256,421		$	438,536		$	—		$	694,957
Net claims and claim expenses incurred – prior accident years	(104,876		)	(58,140		)	(1,110		)	(164,126		)
Net claims and claim expenses incurred – total	$	151,545		$	380,396		$	(1,110	)	$	530,831
Net claims and claim expense ratio – current accident year	35.6		%	64.3		%				49.5		%
Net claims and claim expense ratio – prior accident years	(14.6		)%	(8.6		)%				(11.7		)%
Net claims and claim expense ratio – calendar year	21.0		%	55.7		%				37.8		%
Underwriting expense ratio	28.6		%	41.2		%				34.7		%
Combined ratio	49.6		%	96.9		%				72.5		%

Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure

The following is a summary of the Company’s gross premiums written allocated to the territory of coverage exposure:

Year ended December 31,	2018		2017			2016
Property
U.S. and Caribbean	$	978,063	$	954,269		$	743,226
Worldwide	464,311		305,915			210,168
Europe	144,857		49,486			37,611
Japan	71,601		49,821			44,536
Worldwide (excluding U.S.) (1)	66,872		48,182			55,043
Australia and New Zealand	19,273		14,151			13,729
Other	15,949		18,613			6,950
Total Property	1,760,926		1,440,437			1,111,263
Casualty and Specialty
Worldwide	776,976		686,253			581,972
U.S. and Caribbean	667,125		622,757			646,381
Worldwide (excluding U.S.) (1)	31,734		10,104			13,840
Europe	15,296		9,752			5,541
Australia and New Zealand	3,667		4,141			5,073
Other	54,703		24,103			10,506
Total Casualty and Specialty	1,549,501		1,357,110			1,263,313
Other category	—		(7		)	—
Total gross premiums written	$	3,310,427	$	2,797,540		$	2,374,576

(1) The category “Worldwide (excluding U.S.)” consists of contracts that cover more than one geographic region (other than the U.S.).