RenaissanceRe (RNR) 10-Q 30 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 28, 2014
Document And Entity Information [Abstract]	'	'
Entity Registrant Name	'RENAISSANCERE HOLDINGS LTD.	'
Trading Symbol	'RNR	'
Entity Central Index Key	'0000913144	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	40,520,691

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Fixed maturity investments trading, at fair value (Amortized cost $4,754,480 and $4,781,712 at June 30, 2014 and December 31, 2013, respectively)	$4,841,609	$4,809,036
Fixed maturity investments available for sale, at fair value (Amortized cost $25,512 and $30,273 at June 30, 2014 and December 31, 2013, respectively)	29,219	34,241
Short term investments, at fair value	957,698	1,044,779
Equity investments trading, at fair value	254,408	254,776
Other investments, at fair value	513,614	573,264
Investments in other ventures, under equity method	110,354	105,616
Total investments	6,706,902	6,821,712
Cash and cash equivalents	294,457	408,032
Premiums receivable	837,116	474,087
Prepaid reinsurance premiums	267,963	66,132
Reinsurance recoverable	85,115	101,025
Accrued investment income	28,019	34,065
Deferred acquisition costs	140,765	81,684
Receivable for investments sold	58,205	75,845
Other assets	89,076	108,438
Goodwill and other intangible assets	8,007	8,111
Total assets	8,515,625	8,179,131
Liabilities	'	'
Reserve for claims and claim expenses	1,552,618	1,563,730
Unearned premiums	929,523	477,888
Debt	249,476	249,430
Reinsurance balances payable	558,185	293,022
Payable for investments purchased	201,340	193,221
Other liabilities	164,650	397,596
Total liabilities	3,655,792	3,174,887
Commitments and Contingencies	'	'
Redeemable noncontrolling interest	1,023,892	1,099,860
Shareholders’ Equity	'	'
Preference shares: $1.00 par value – 16,000,000 shares issued and outstanding at June 30, 2014 (December 31, 2013 – 16,000,000)	400,000	400,000
Common shares: $1.00 par value – 40,522,818 shares issued and outstanding at June 30, 2014 (December 31, 2013 – 43,646,436)	40,523	43,646
Accumulated other comprehensive income	3,918	4,131
Retained earnings	3,391,500	3,456,607
Total shareholders’ equity attributable to RenaissanceRe	3,835,941	3,904,384
Total liabilities, noncontrolling interests and shareholders’ equity	$8,515,625	$8,179,131

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Fixed maturity investments trading, amortized cost	$4,754,480	$4,781,712
Fixed maturity investments available for sale, amortized cost	$25,512	$30,273
Preference Shares, Par Value (In dollars per share)	$1	$1
Preference Shares, Shares issued (In shares)	16,000,000	16,000,000
Preference Shares, Shares outstanding (In shares)	16,000,000	16,000,000
Common Shares, Par Value (In dollars per share)	$1	$1
Common Shares, Shares issued (In shares)	40,522,818	43,646,436
Common Shares, Shares outstanding (In shares)	40,522,818	43,646,436

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues	'	'	'	'
Gross premiums written	$511,540	$703,223	$1,216,800	$1,338,641
Net premiums written	346,407	559,109	796,754	995,922
Increase in unearned premiums	-85,991	-267,220	-249,804	-432,778
Net premiums earned	260,416	291,889	546,950	563,144
Net investment income	34,541	26,163	73,489	69,365
Net foreign exchange gains (losses)	2,392	-932	1,331	-318
Equity in earnings of other ventures	7,232	3,772	11,431	9,607
Other loss	-535	-1,128	-473	-2,837
Net realized and unrealized gains (losses) on investments	27,128	-69,529	42,055	-55,260
Total revenues	331,174	250,235	674,783	583,701
Expenses	'	'	'	'
Net claims and claim expenses incurred	81,388	103,962	140,303	131,213
Acquisition expenses	33,477	31,767	67,177	56,776
Operational expenses	45,841	42,789	88,465	88,775
Corporate expenses	3,954	21,529	8,499	26,011
Interest expense	4,292	4,300	8,585	9,334
Total expenses	168,952	204,347	313,029	312,109
Income from continuing operations before taxes	162,222	45,888	361,754	271,592
Income tax benefit (expense)	204	-11	38	-133
Income from continuing operations	162,426	45,877	361,792	271,459
Income from discontinued operations	'	2,427	0	12,201
Net income	162,426	48,304	361,792	283,660
Net income attributable to noncontrolling interests	-36,078	-14,015	-78,846	-52,622
Net income attributable to RenaissanceRe	126,348	34,289	282,946	231,038
Dividends on preference shares	-5,596	-7,483	-11,191	-13,758
Net income available to RenaissanceRe common shareholders	$120,752	$26,806	$271,755	$217,280
Income from continuing operations available to RenaissanceRe common shareholders per common share – basic, in dollars per share	$3	$0.55	$6.62	$4.65
Income from discontinued operations available to RenaissanceRe common shareholders per common share – basic, in dollars per share	$0	$0.06	$0	$0.28
Net income available to RenaissanceRe common shareholders per common share – basic, in dollars per share	$3	$0.61	$6.62	$4.93
Income from continuing operations available to RenaissanceRe common shareholders per common share – diluted, in dollars per share	$2.95	$0.55	$6.52	$4.55
Income from discontinued operations available to RenaissanceRe common shareholders per common share – diluted, in dollars per share	$0	$0.05	$0	$0.28
Net income available to RenaissanceRe common shareholders per common share – diluted, in dollars per share	$2.95	$0.60	$6.52	$4.83
Dividends per common share, in dollars per share	'	$0.28	$0.58	$0.56

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Comprehensive income (loss)	'	'	'	'
Net income	$162,426	$48,304	$361,792	$283,660
Change in net unrealized gains on investments	-45	-1,141	-213	-8,713
Comprehensive income	162,381	47,163	361,579	274,947
Net income attributable to noncontrolling interests	-36,078	-14,015	-78,846	-52,622
Comprehensive income attributable to noncontrolling interests	-36,078	-14,015	-78,846	-52,622
Comprehensive income attributable to RenaissanceRe	126,303	33,148	282,733	222,325
Disclosure regarding net unrealized gains	'	'	'	'
Total realized and net unrealized holding (gains) losses on investments and net other-than-temporary impairments	-45	178	-213	-1,533
Net realized gains on fixed maturity investments available for sale	0	-1,319	0	-7,180
Change in net unrealized gains on investments	($45)	($1,141)	($213)	($8,713)

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Shareholders' Equity (USD $)	Total	Preference Shares	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Noncontrolling Interest
In Thousands, unless otherwise specified
Beginning of period at Dec. 31, 2012	'	$400,000	$45,542	$0	$13,622	$3,043,901	'
Statement of Changes in Stockholders' Equity	'	'	'	'	'	'	'
Issuance of shares	'	275,000	'	'	'	'	'
Repurchase of shares	'	-275,000	-1,498	-2,978	'	-117,520	'
Offering expenses	'	'	'	-9,345	'	'	'
Change in noncontrolling interests	'	'	'	499	'	'	'
Exercise of options and issuance of restricted stock awards	'	'	341	11,824	'	'	'
Change in net unrealized gains on investments	-8,713	'	'	'	-8,713	'	'
Net income	283,660	'	'	'	'	283,660	'
Net income attributable to noncontrolling interests	-52,622	'	'	'	'	-52,622	'
Dividends on common shares	'	'	'	'	'	-24,658	'
Dividends on preference shares	-13,758	'	'	'	'	-13,758	'
Noncontrolling interest	'	'	'	'	'	'	3,693
Total shareholders’ equity	3,571,990	'	'	'	'	'	'
End of period at Jun. 30, 2013	'	400,000	44,385	0	4,909	3,119,003	'
Beginning of period at Dec. 31, 2013	3,904,384	400,000	43,646	0	4,131	3,456,607	'
Statement of Changes in Stockholders' Equity	'	'	'	'	'	'	'
Issuance of shares	'	0	'	'	'	'	'
Repurchase of shares	'	0	-3,363	2,139	'	-313,312	'
Offering expenses	'	'	'	0	'	'	'
Change in noncontrolling interests	'	'	'	43	'	'	'
Exercise of options and issuance of restricted stock awards	'	'	240	-2,182	'	'	'
Change in net unrealized gains on investments	-213	'	'	'	-213	'	'
Net income	361,792	'	'	'	'	361,792	'
Net income attributable to noncontrolling interests	-78,846	'	'	'	'	-78,846	'
Dividends on common shares	'	'	'	'	'	-23,550	'
Dividends on preference shares	-11,191	'	'	'	'	-11,191	'
Noncontrolling interest	'	'	'	'	'	'	0
Total shareholders’ equity	3,835,941	'	'	'	'	'	'
End of period at Jun. 30, 2014	$3,835,941	$400,000	$40,523	$0	$3,918	$3,391,500	'

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows provided by operating activities	'	'
Net income	$361,792,000	$283,660,000
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Amortization, accretion and depreciation	15,419,000	26,721,000
Equity in undistributed earnings of other ventures	-7,960,000	-6,468,000
Net realized and unrealized gains on investments	-42,055,000	55,273,000
Net unrealized gains included in net investment income	-8,879,000	-10,959,000
Net unrealized (gains) losses included in other loss	-2,220,000	11,206,000
Change in:	'	'
Premiums receivable	-363,029,000	-462,777,000
Prepaid reinsurance premiums	-201,831,000	-137,722,000
Reinsurance recoverable	15,910,000	17,409,000
Deferred acquisition costs	-59,081,000	-73,060,000
Reserve for claims and claim expenses	-11,112,000	-168,969,000
Unearned premiums	451,635,000	570,500,000
Reinsurance balances payable	265,163,000	97,006,000
Other	-240,366,000	-24,401,000
Net cash provided by operating activities	173,386,000	177,419,000
Cash flows provided by investing activities	'	'
Proceeds from sales and maturities of fixed maturity investments trading	4,020,174,000	4,448,449,000
Purchases of fixed maturity investments trading	-3,970,317,000	-4,225,188,000
Proceeds from sales and maturities of fixed maturity investments available for sale	5,114,000	41,338,000
Net purchases of equity investments trading	-11,146,000	-35,958,000
Net sales (purchases) of short term investments	89,549,000	-110,562,000
Net sales of other investments	68,684,000	42,935,000
Net sales (purchases) of investments in other ventures	1,030,000	-2,500,000
Net sales of other assets	6,000,000	598,000
Net cash provided by investing activities	209,088,000	159,112,000
Cash flows used in financing activities	'	'
Dividends paid – RenaissanceRe common shares	-23,550,000	-24,658,000
Dividends paid – preference shares	-11,191,000	-13,758,000
RenaissanceRe common share repurchases	-314,536,000	-121,996,000
Net repayment of debt	0	-101,410,000
Net third party redeemable noncontrolling interest share transactions	-144,096,000	-105,633,000
Net cash used in financing activities	-493,373,000	-376,800,000
Effect of exchange rate changes on foreign currency cash	-2,676,000	505,000
Net (decrease) increase in cash and cash equivalents	-113,575,000	-39,764,000
Net increase in cash and cash equivalents of discontinued operations	0	-29,475,000
Cash and cash equivalents, beginning of period	408,032,000	304,145,000
Cash and cash equivalents, end of period	$294,457,000	$234,906,000

Organization

Organization	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization	'
	ORGANIZATION
	This report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K (“Form 10-K”) for the fiscal year ended December 31, 2013.
	RenaissanceRe Holdings Ltd. (“RenaissanceRe”) was formed under the laws of Bermuda on June 7, 1993. Together with its wholly owned and majority-owned subsidiaries and DaVinciRe (as defined below), which are collectively referred to herein as the “Company”, RenaissanceRe provides reinsurance and insurance coverages and related services to a broad range of customers.
	•	Renaissance Reinsurance Ltd. (“Renaissance Reinsurance”), the Company’s principal reinsurance subsidiary, provides property catastrophe and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis.
	•	The Company also manages property catastrophe and specialty reinsurance business written on behalf of joint ventures, which principally include Top Layer Reinsurance Ltd. (“Top Layer Re”), recorded under the equity method of accounting, and DaVinci Reinsurance Ltd. (“DaVinci”). Because the Company owns a noncontrolling equity interest in, but controls a majority of the outstanding voting power of DaVinci’s parent, DaVinciRe Holdings Ltd. (“DaVinciRe”), the results of DaVinci and DaVinciRe are consolidated in the Company’s financial statements. Redeemable noncontrolling interest - DaVinciRe represents the interests of external parties with respect to the net income and shareholders’ equity of DaVinciRe. Renaissance Underwriting Managers, Ltd. (“RUM”), a wholly owned subsidiary, acts as exclusive underwriting manager for these joint ventures in return for fee-based income and profit participation.
	•	RenaissanceRe Syndicate 1458 (“Syndicate 1458”) is the Company’s Lloyd’s syndicate. RenaissanceRe Corporate Capital (UK) Limited (“RenaissanceRe CCL”), a wholly owned subsidiary of RenaissanceRe, is Syndicate 1458’s sole corporate member and RenaissanceRe Syndicate Management Ltd. (“RSML”), a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458.
	•	RenaissanceRe Specialty Risks Ltd. (“RenaissanceRe Specialty Risks”), is a Bermuda-domiciled reinsurance and excess and surplus lines insurance company that is listed on the National Association of Insurance Commissioners’ International Insurance Department’s Quarterly List of Alien Insurers as an eligible surplus lines insurer. RenaissanceRe Underwriting Managers U.S. LLC (“RenaissanceRe Underwriting Managers U.S.”), a specialty reinsurance agency domiciled in Connecticut, provides specialty treaty reinsurance solutions on both a quota share and excess of loss basis; and writes business on behalf of RenaissanceRe Specialty U.S. Ltd. (“RenaissanceRe Specialty U.S.”), a Bermuda-domiciled reinsurer launched in June 2013 which operates subject to U.S. federal income tax, and Syndicate 1458.
	•	Effective January 1, 2013, the Company formed and launched a managed joint venture, Upsilon Reinsurance II Ltd. (“Upsilon Re II”), a Bermuda domiciled special purpose insurer (“SPI”), to provide additional capacity to the worldwide aggregate and per-occurrence primary and retrocessional property catastrophe excess of loss market. Effective December 11, 2013, Upsilon Re II was renamed Upsilon Reinsurance Fund Opportunities Ltd. (“Upsilon RFO”). Upsilon RFO is considered a variable interest entity (“VIE”) and the Company is considered the primary beneficiary. As a result, Upsilon RFO is consolidated by the Company and all significant inter-company transactions have been eliminated.
	•	RenaissanceRe Medici Fund Ltd. (“Medici”) is an exempted fund, incorporated under the laws of Bermuda. Medici’s objective is to seek to invest substantially all of its assets in various insurance-based investment instruments that have returns primarily tied to property catastrophe risk. During 2013, third-party investors subscribed for a portion of the participating, non-voting common shares of Medici. Because the Company owns a noncontrolling equity interest in, but controls all of the outstanding voting power of Medici, the results of Medici are consolidated in the Company’s financial statements. Redeemable noncontrolling interest - Medici represents the interests of external parties with respect to the net income and shareholders’ equity of Medici.
	•	On August 30, 2013, RenaissanceRe entered into a purchase agreement with a subsidiary of Munich-American Holding Corporation (together with applicable affiliates, “Munich”) to sell the Company’s U.S.-based weather and weather-related energy risk management unit, which principally included RenRe Commodity Advisors LLC (“RRCA”), Renaissance Trading Ltd. (“Renaissance Trading”) and RenRe Energy Advisors Ltd. (collectively referred to as “REAL”). REAL offered certain derivative-based risk management products primarily to address weather and energy risk and engaged in hedging and trading activities related to those transactions. On October 1, 2013, RenaissanceRe closed the sale of REAL to Munich. In the third quarter of 2013, the Company classified the assets and liabilities associated with this transaction as held for sale. The financial results for these operations have been presented in the Company’s consolidated financial statements as “discontinued operations” for all periods presented. Refer to “Note 3. Discontinued Operations”, for more information.

Significant_Accounting_Policie

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	SIGNIFICANT ACCOUNTING POLICIES
	There have been no material changes to the Company’s significant accounting policies as described in its Form 10-K for the year ended December 31, 2013, except as noted below.
	BASIS OF PRESENTATION
	The consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, these unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position and results of operations as at the end of and for the periods presented. All significant intercompany accounts and transactions have been eliminated from these statements. Except as discussed in “Note 3. Discontinued Operations,” and unless otherwise noted, the notes to the consolidated financial statements reflect the Company’s continuing operations.
	Certain comparative information has been reclassified to conform to the current presentation. Because of the seasonality of the Company’s business, the results of operations and cash flows for any interim period will not necessarily be indicative of the results of operations and cash flows for the full fiscal year or subsequent quarters.
	USE OF ESTIMATES IN FINANCIAL STATEMENTS
	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the reserve for claims and claim expenses; reinsurance recoverables, including allowances for reinsurance recoverables deemed uncollectible; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges and the Company’s deferred tax valuation allowance.
	DISCONTINUED OPERATIONS
	The results of operations of REAL, which has been sold to an unaffiliated third party, is classified as held for sale and reported as discontinued operations in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic Discontinued Operations. The consolidated financial statements and notes thereto are presented excluding the operations and cash flows of the discontinued operations from the continuing operations of the Company since the Company will not have any significant continuing involvement in the operations after the sale. The financial position and results of operations of discontinued operations are presented as single line items on the consolidated balance sheets and statements of operations, respectively. Certain prior year comparatives have been reclassified to conform to the current year presentation.
	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The objective of ASU 2013-11 is to improve the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 seeks to reduce the diversity in practice by providing guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 became effective for annual and interim reporting periods beginning after December 15, 2013. The Company prospectively adopted ASU 2013-11 effective January 1, 2014 and the adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position.
	Financial Services - Investment Companies (Topic 946) Amendments to the Scope, Measurement, and Disclosure Requirements
	In June 2013, the FASB issued ASU No. 2013-08, Amendments to the Scope, Measurement, and Disclosure Requirements (“ASU 2013-08”). The objective of ASU 2013-08 is to change the approach to the investment company assessment, clarify the characteristics of an investment company and provide comprehensive guidance for assessing whether an entity is an investment company. In addition, ASU 2013-08 will require an investment company to measure noncontrolling ownership interests in other investment companies at fair value rather than using the equity method of accounting and require the following additional disclosures: (a) the fact that the entity is an investment company and is applying the guidance, (b) information about changes, if any, in an entity’s status as an investment company, and (c) information about financial support provided or contractually required to be provided by an investment company to any of its investees. ASU 2013-08 became effective for annual and interim reporting periods beginning after December 15, 2013. The Company prospectively adopted ASU 2013-08 effective January 1, 2014 and the adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position.
	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED
	Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). The objective of ASU 2014-08 is to improve the definition of discontinued operations by limiting discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results. ASU 2014-08 will also require expanded disclosures for discontinued operations and require an entity to disclose the pretax profit or loss of an individually significant component of an entity that does not qualify for discontinued operations reporting. ASU 2014-08 is prospectively effective for public business entities in annual periods beginning on or after December 15, 2014, and interim periods beginning on or after December 15, 2015. Entities may early adopt ASU 2014-08 for new disposals that have not been reported in the consolidated financial statements previously issued or available for issuance. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Discontinued_Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations	'
	DISCONTINUED OPERATIONS
	REAL
	On August 30, 2013, RenaissanceRe entered into a purchase agreement with Munich to sell REAL and, on October 1, 2013, RenaissanceRe closed the sale of REAL to Munich. In the third quarter of 2013, the Company classified the assets and liabilities associated with this transaction as held for sale and the financial results are reflected in the Company’s consolidated financial statements as “discontinued operations.”  Consideration for the transaction was $60.0 million, paid in cash at closing, subject to post-closing adjustments for certain tax and other items. The Company recorded a loss on sale of $8.8 million in the third quarter of 2013 in conjunction with the sale, including related direct expenses.
	Except as explicitly described as held for sale or as discontinued operations, and unless otherwise noted, all discussions and amounts presented herein relate to the Company’s continuing operations. All prior periods presented have been reclassified to conform to this form of presentation.
	The Company did not have any assets, liabilities or shareholder’s equity of discontinued operations held for sale related to REAL at June 30, 2014 or December 31, 2013.
	Details of the income from discontinued operations for the three and six months ended June 30, 2014 and 2013 are as follows and relate entirely to REAL:
			Three months ended June 30,					Six months ended June 30,
			2014		2013			2014		2013
		Revenues
		Net investment income	$	—	$	1,161		$	—	$	1,153
		Net foreign exchange (losses) gains	—		(153		)	—		989
		Other income	—		1,759			—		10,472
		Net realized and unrealized losses on investments	—		(15		)	—		(13		)
		Total revenues	—		2,752			—		12,601
		Expenses
		Operational expenses	—		31			—		59
		Corporate expenses	—		59			—		106
		Total expenses	—		90			—		165
		Income before taxes	—		2,662			—		12,436
		Income tax expense	—		(236		)	—		(236		)
		Income from discontinued operations	$	—	$	2,426		$	—	$	12,200

Investments

Investments	6 Months Ended
	Jun. 30, 2014
Investments [Abstract]	'
Investments	'
	INVESTMENTS
	Fixed Maturity Investments Trading
	The following table summarizes the fair value of fixed maturity investments trading:
			June 30,			December 31,
			2014			2013
		U.S. treasuries	$	1,706,929		$	1,352,413
		Agencies	121,650			186,050
		Non-U.S. government (Sovereign debt)	271,495			334,580
		Non-U.S. government-backed corporate	163,911			237,479
		Corporate	1,580,038			1,803,415
		Agency mortgage-backed	321,629			336,661
		Non-agency mortgage-backed	252,530			243,795
		Commercial mortgage-backed	392,085			303,214
		Asset-backed	31,342			11,429
		Total fixed maturity investments trading	$	4,841,609		$	4,809,036
	Fixed Maturity Investments Available For Sale
	The following table summarizes the amortized cost, fair value and related unrealized gains and losses and non-credit other-than-temporary impairments of fixed maturity investments available for sale:
						Included in Accumulated
						Other Comprehensive Income
		30-Jun-14	Amortized			Gross			Gross			Fair Value			Non-Credit
			Cost			Unrealized Gains			Unrealized Losses						Other-Than-
															Temporary
															Impairments
															(1)
		Agency mortgage-backed	$	4,279		$	396		$	—		$	4,675		$	—
		Non-agency mortgage-backed	10,509			2,304			(3		)	12,810			(698		)
		Commercial mortgage-backed	7,373			830			—			8,203			—
		Asset-backed	3,351			180			—			3,531			—
		Total fixed maturity investments available for sale	$	25,512		$	3,710		$	(3	)	$	29,219		$	(698	)
						Included in Accumulated
						Other Comprehensive Income
		31-Dec-13	Amortized Cost			Gross			Gross			Fair Value			Non-Credit
						Unrealized Gains			Unrealized Losses						Other-Than-
															Temporary
															Impairments
															(1)
		Agency mortgage-backed	$	4,880		$	378		$	(11	)	$	5,247		$	—
		Non-agency mortgage-backed	11,735			2,414			(6		)	14,143			(742		)
		Commercial mortgage-backed	10,052			970			—			11,022			—
		Asset-backed	3,606			223			—			3,829			—
		Total fixed maturity investments available for sale	$	30,273		$	3,985		$	(17	)	$	34,241		$	(742	)
	-1	Represents the non-credit component of other-than-temporary impairments recognized in accumulated other comprehensive income adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.
	Contractual maturities of fixed maturity investments are as follows. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
			Trading						Available for Sale						Total Fixed Maturity Investments
		30-Jun-14	Amortized			Fair Value			Amortized Cost			Fair Value			Amortized Cost			Fair Value
			Cost
		Due in less than one year	$	100,250		$	100,765		$	—		$	—		$	100,250		$	100,765
		Due after one through five years	3,057,740			3,080,879			—			—			3,057,740			3,080,879
		Due after five through ten years	520,699			529,811			—			—			520,699			529,811
		Due after ten years	102,944			132,568			—			—			102,944			132,568
		Mortgage-backed	943,257			966,244			22,161			25,688			965,418			991,932
		Asset-backed	29,590			31,342			3,351			3,531			32,941			34,873
		Total	$	4,754,480		$	4,841,609		$	25,512		$	29,219		$	4,779,992		$	4,870,828
	Equity Investments Trading
	The following table summarizes the fair value of equity investments trading:
			June 30,			December 31,
			2014			2013
		Financials	$	153,099		$	152,905
		Industrial, utilities and energy	32,127			25,350
		Communications and technology	31,245			4,300
		Consumer	18,302			44,115
		Healthcare	15,609			15,340
		Basic materials	4,026			12,766
	Total	$	254,408		$	254,776
Pledged Investments
At June 30, 2014, $2,036.3 million of cash and investments at fair value were on deposit with, or in trust accounts for the benefit of various counterparties, including with respect to the Company’s syndicated letter of credit facility and bilateral letter of credit facility (December 31, 2013 - $2,081.1 million). Of this amount, $673.9 million is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities (December 31, 2013 - $652.8 million).
Reverse Repurchase Agreements
At June 30, 2014, the Company held $35.9 million (December 31, 2013 - $37.3 million) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of short term investments on the Company’s consolidated balance sheets. The required collateral for these loans typically include high-quality, readily marketable instruments at a minimum rate of 102% of the loan principal. Upon maturity, the Company receives principal and interest income.
Net Investment Income, Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments
The components of net investment income are as follows:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
	Fixed maturity investments	$	26,372		$	22,839		$	50,232		$	46,725
	Short term investments	286			426			476			755
	Equity investments	779			344			1,575			344
	Other investments
	Hedge funds and private equity investments	8,340			2,237			20,657			17,117
	Other	1,483			3,144			6,011			10,139
	Cash and cash equivalents	93			9			184			61
		37,353			28,999			79,135			75,141
	Investment expenses	(2,812		)	(2,836		)	(5,646		)	(5,776		)
	Net investment income	$	34,541		$	26,163		$	73,489		$	69,365
The following table provides an analysis of the components of net realized and unrealized gains on investments.
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
	Gross realized gains	$	12,166		$	17,548		$	25,633		$	51,624
	Gross realized losses	(2,587		)	(14,601		)	(8,151		)	(19,155		)
	Net realized gains on fixed maturity investments	9,579			2,947			17,482			32,469
	Net unrealized gains (losses) on fixed maturity investments trading	29,918			(95,680		)	57,800			(118,743		)
	Net realized and unrealized (losses) gains on investments-related derivatives	(6,884		)	20,510			(17,783		)	20,931
	Net realized gains on equity investments trading	5,134			74			5,055			17,635
	Net unrealized (losses) gains on equity investments trading	(10,619		)	2,620			(20,499		)	(7,552		)
	Net realized and unrealized gains on investments	$	27,128		$	(69,529	)	$	42,055		$	(55,260	)
The following tables provide an analysis of the components of other comprehensive income and reclassifications out of accumulated other comprehensive income.
		Three months ended June 30, 2014
		Investments in other ventures			Fixed maturity investments available for sale			Total
	Beginning balance	$	160		$	3,803		$	3,963
	Other comprehensive income (loss) before reclassifications	51			(96		)	(45		)
	Ending balance	$	211		$	3,707		$	3,918
		Six months ended June 30, 2014
		Investments in other ventures			Fixed maturity investments available for sale			Total
	Beginning balance	$	163		$	3,968		$	4,131
	Other comprehensive income (loss) before reclassifications	48			(261		)	(213		)
	Ending balance	$	211		$	3,707		$	3,918
		Three months ended June 30, 2013
		Investments in other ventures			Fixed maturity investments available for sale			Total
	Beginning balance	$	120		$	5,930		$	6,050
	Other comprehensive income before reclassifications	98			80			178
	Amounts reclassified from accumulated other comprehensive income by statement of operations line item:
	Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	—			(1,319		)	(1,319		)
	Net current-period other comprehensive loss	98			(1,239		)	(1,141		)
	Ending balance	$	218		$	4,691		$	4,909
		Six months ended June 30, 2013
		Investments in other ventures			Fixed maturity investments available for sale			Total
	Beginning balance	$	1,625		$	11,997		$	13,622
	Other comprehensive loss before reclassifications	(1,407		)	(126		)	(1,533		)
	Amounts reclassified from accumulated other comprehensive income by statement of operations line item:
	Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	—			(7,180		)	(7,180		)
	Net current-period other comprehensive loss	(1,407		)	(7,306		)	(8,713		)
	Ending balance	$	218		$	4,691		$	4,909
The following tables provide an analysis of the length of time the Company’s fixed maturity investments available for sale in an unrealized loss have been in a continual unrealized loss position.
		Less than 12 Months						12 Months or Greater						Total
	At June 30, 2014	Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
					Losses						Losses						Losses
	Non-agency mortgage-backed	$	—		$	—		$	76		$	(3	)	$	76		$	(3	)
	Total	$	—		$	—		$	76		$	(3	)	$	76		$	(3	)
		Less than 12 Months						12 Months or Greater						Total
	31-Dec-13	Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
					Losses						Losses						Losses
	Agency mortgage-backed	$	726		$	(11	)	$	—		$	—		$	726		$	(11	)
	Non-agency mortgage-backed	—			—			89			(6		)	89			(6		)
	Commercial mortgage-backed	39			—			—			—			39			—
	Total	$	765		$	(11	)	$	89		$	(6	)	$	854		$	(17	)
At June 30, 2014, the Company held two fixed maturity investments available for sale securities that were in an unrealized loss position (December 31, 2013 - four), including two fixed maturity investments available for sale securities that were in an unrealized loss position for twelve months or greater (December 31, 2013 - two). The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell these securities before the anticipated recovery of the remaining amortized cost basis. The Company performed reviews of its fixed maturity investments available for sale for the six months ended June 30, 2014 and 2013, respectively, in order to determine whether declines in the fair value below the amortized cost basis were considered other-than-temporary in accordance with the applicable guidance, as discussed below.
Other-Than-Temporary Impairment Process
The Company’s process for assessing whether declines in the fair value of its fixed maturity investments available for sale represent impairments that are other-than-temporary includes reviewing each fixed maturity investment available for sale that is impaired and determining: (i) if the Company has the intent to sell the debt security or (ii) if it is more likely than not that the Company will be required to sell the debt security before its anticipated recovery; and (iii) whether a credit loss exists, that is, where the Company expects that the present value of the cash flows expected to be collected from the security is less than the amortized cost basis of the security.
For the six months ended June 30, 2014, the Company recognized $Nil of other-than-temporary impairments which were recognized in earnings and $Nil related to other factors which were recognized in other comprehensive income (2013 – $Nil and $Nil, respectively).
The following table provides a rollforward of the amount of other-than-temporary impairments related to credit losses recognized in earnings for which a portion of an other-than-temporary impairment was recognized in accumulated other comprehensive income:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
	Beginning balance	$	545		$	811		$	561		$	838
	Reductions:
	Securities sold during the period	(16		)	(20		)	(32		)	(47		)
	Ending balance	$	529		$	791		$	529		$	791

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	The use of fair value to measure certain assets and liabilities with resulting unrealized gains or losses is pervasive within the Company’s consolidated financial statements. Fair value is defined under accounting guidance currently applicable to the Company to be the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between open market participants at the measurement date. The Company recognizes the change in unrealized gains and losses arising from changes in fair value in its consolidated statements of operations, with the exception of changes in unrealized gains and losses on its fixed maturity investments available for sale, which are recognized as a component of accumulated other comprehensive income in shareholders’ equity.
	FASB ASC Topic Fair Value Measurements and Disclosures prescribes a fair value hierarchy that prioritizes the inputs to the respective valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to valuation techniques that use at least one significant input that is unobservable (Level 3). The three levels of the fair value hierarchy are described below:
	•	Fair values determined by Level 1 inputs utilize unadjusted quoted prices obtained from active markets for identical assets or liabilities for which the Company has access. The fair value is determined by multiplying the quoted price by the quantity held by the Company;
	•	Fair values determined by Level 2 inputs utilize inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals, broker quotes and certain pricing indices; and
	•	Level 3 inputs are based all or in part on significant unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. In these cases, significant management assumptions can be used to establish management’s best estimate of the assumptions used by other market participants in determining the fair value of the asset or liability.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement of the asset or liability. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and the Company considers factors specific to the asset or liability.
	In order to determine if a market is active or inactive for a security, the Company considers a number of factors, including, but not limited to, the spread between what a seller is asking for a security and what a buyer is bidding for the same security, the volume of trading activity for the security in question, the price of the security compared to its par value (for fixed maturity investments), and other factors that may be indicative of market activity.
	There have been no material changes in the Company’s valuation techniques, nor have there been any transfers between Level 1 and Level 2, and transfers into or out of Level 3, respectively, during the period represented by these consolidated financial statements.
	Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets:
		At June 30, 2014	Total			Quoted			Significant				Significant
						Prices in Active			Other				Unobservable
						Markets for			Observable				Inputs
						Identical			Inputs				(Level 3)
						Assets			(Level 2)
						(Level 1)
		Fixed maturity investments
		U.S. treasuries	$	1,706,929		$	1,706,929		$	—			$	—
		Agencies	121,650			—			121,650				—
		Non-U.S. government (Sovereign debt)	271,495			—			271,495				—
		Non-U.S. government-backed corporate	163,911			—			163,911				—
		Corporate	1,580,038			—			1,533,862				46,176
		Agency mortgage-backed	326,304			—			326,304				—
		Non-agency mortgage-backed	265,340			—			265,340				—
		Commercial mortgage-backed	400,288			—			400,288				—
		Asset-backed	34,873			—			34,873				—
		Total fixed maturity investments	4,870,828			1,706,929			3,117,723				46,176
		Short term investments	957,698			—			957,698				—
		Equity investments trading	254,408			254,408			—				—
		Other investments
		Private equity partnerships	314,983			—			—				314,983
		Catastrophe bonds	179,465			—			179,465				—
		Senior secured bank loan funds	15,976			—			—				15,976
		Hedge funds	3,190			—			—				3,190
		Total other investments	513,614			—			179,465				334,149
		Other assets and (liabilities)
		Derivatives (1)	6,491			(340		)	5,760				1,071
		Other	(5,214		)	—			(5,214		)		—
		Total other assets and (liabilities)	1,277			(340		)	546				1,071
			$	6,597,825		$	1,960,997		$	4,255,432			$	381,396
	(1) See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
		December 31, 2013	Total			Quoted			Significant				Significant
						Prices in Active			Other				Unobservable
						Markets for			Observable				Inputs
						Identical			Inputs				(Level 3)
						Assets			(Level 2)
						(Level 1)
		Fixed maturity investments
		U.S. treasuries	$	1,352,413		$	1,352,413		$	—			$	—
		Agencies	186,050			—			186,050				—
		Non-U.S. government (Sovereign debt)	334,580			—			334,580				—
		Non-U.S. government-backed corporate	237,479			—			237,479				—
		Corporate	1,803,415			—			1,775,835				27,580
		Agency mortgage-backed	341,908			—			341,908				—
		Non-agency mortgage-backed	257,938			—			257,938				—
		Commercial mortgage-backed	314,236			—			314,236				—
		Asset-backed	15,258			—			15,258				—
		Total fixed maturity investments	4,843,277			1,352,413			3,463,284				27,580
		Short term investments	1,044,779			—			1,044,779				—
		Equity investments trading	254,776			254,776			—				—
		Other investments
		Private equity partnerships	322,391			—			—				322,391
		Catastrophe bonds	229,016			—			229,016				—
	Senior secured bank loan funds	18,048			—			—				18,048
	Hedge funds	3,809			—			—				3,809
	Total other investments	573,264			—			229,016				344,248
	Other assets and (liabilities)
	Derivatives (1)	4,758			823			6,425				(2,490		)
	Other	(12,991		)	—			(12,991		)		—
	Total other assets and (liabilities)	(8,233		)	823			(6,566		)		(2,490		)
		$	6,707,863		$	1,608,012		$	4,730,513			$	369,338
(1) See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
Level 1 and Level 2 Assets and Liabilities Measured at Fair Value
Fixed Maturity Investments
Fixed maturity investments included in Level 1 consist of the Company’s investments in U.S. treasuries. Fixed maturity investments included in Level 2 are agencies, non-U.S. government, non-U.S. government-backed corporate, corporate, agency mortgage-backed, non-agency mortgage-backed, commercial mortgage-backed and asset-backed.
The Company’s fixed maturity investments are primarily priced using pricing services, such as index providers and pricing vendors, as well as broker quotations. In general, the pricing vendors provide pricing for a high volume of liquid securities that are actively traded. For securities that do not trade on an exchange, the pricing services generally utilize market data and other observable inputs in matrix pricing models to determine month end prices. Observable inputs include benchmark yields, reported trades, broker-dealer quotes, issuer spreads, bids, offers, reference data and industry and economic events. Index pricing generally relies on market traders as the primary source for pricing, however models are also utilized to provide prices for all index eligible securities. The models use a variety of observable inputs such as benchmark yields, transactional data, dealer runs, broker-dealer quotes and corporate actions. Prices are generally verified using third party data. Securities which are priced by an index provider are generally included in the index.
In general, broker-dealers value securities through their trading desks based on observable inputs. The methodologies include mapping securities based on trade data, bids or offers, observed spreads, and performance on newly issued securities. Broker-dealers also determine valuations by observing secondary trading of similar securities. Prices obtained from broker quotations are considered non-binding, however they are based on observable inputs and by observing secondary trading of similar securities obtained from active, non-distressed markets.
The Company considers these Level 2 inputs as they are corroborated with other market observable inputs. The techniques generally used to determine the fair value of the Company’s fixed maturity investments are detailed below by asset class.
U.S. treasuries
Level 1 - At June 30, 2014, the Company’s U.S. treasuries fixed maturity investments are primarily priced by pricing services and had a weighted average effective yield of 0.9% and a weighted average credit quality of AA (December 31, 2013 - 0.8% and AA, respectively). When pricing these securities, the pricing services utilize daily data from many real time market sources, including active broker dealers. Certain data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source is used for each issue and maturity date.
Agencies
Level 2 - At June 30, 2014, the Company’s agency fixed maturity investments had a weighted average effective yield of 1.4% and a weighted average credit quality of AA (December 31, 2013 - 1.3% and AA, respectively). The issuers of the Company’s agency fixed maturity investments primarily consist of the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and other agencies. Fixed maturity investments included in agencies are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources and integrate other observations from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The fair value of each security is individually computed using analytical models which incorporate option adjusted spreads and other daily interest rate data.
Non-U.S. government (Sovereign debt)
Level 2 - Non-U.S. government fixed maturity investments held by the Company at June 30, 2014 had a weighted average effective yield of 1.2% and a weighted average credit quality of AA (December 31, 2013 - 1.3% and AA, respectively). The issuers of securities in this sector are non-U.S. governments and their respective agencies as well as supranational organizations. Securities held in these sectors are primarily priced by pricing services who employ proprietary discounted cash flow models to value the securities. Key quantitative inputs for these models are daily observed benchmark curves for treasury, swap and high issuance credits. The pricing services then apply a credit spread for each security which is developed by in-depth and real time market analysis. For securities in which trade volume is low, the pricing services utilize data from more frequently traded securities with similar attributes. These models may also be supplemented by daily market and credit research for international markets.
Non-U.S. government-backed corporate
Level 2 - Non-U.S. government-backed corporate fixed maturity investments had a weighted average effective yield of 1.3% and a weighted average credit quality of AAA at June 30, 2014 (December 31, 2013 - 1.1% and AAA, respectively). Non-U.S. government-backed fixed maturity investments are primarily priced by pricing services who employ proprietary discounted cash flow models to value the securities. Key quantitative inputs for these models are daily observed benchmark curves for treasury, swap and high issuance credits. The pricing services then apply a credit spread to the respective curve for each security which is developed by in-depth and real time market analysis. For securities in which trade volume is low, the pricing services utilize data from more frequently traded securities with similar attributes. These models may also be supplemented by daily market and credit research for international markets.
Corporate
Level 2 - At June 30, 2014, the Company’s corporate fixed maturity investments principally consist of U.S. and international corporations and had a weighted average effective yield of 2.7% and a weighted average credit quality of BBB (December 31, 2013 - 2.7% and BBB, respectively). The Company’s corporate fixed maturity investments are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources regarding the issuer of the security and obtain credit data, as well as other observations, from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The pricing services also consider the specific terms and conditions of the securities, including any specific features which may influence risk. In certain instances, securities are individually evaluated using a spread which is added to the U.S. treasury curve or a security specific swap curve as appropriate.
Agency mortgage-backed
Level 2 - At June 30, 2014, the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average effective yield of 2.2%, a weighted average credit quality of AA and a weighted average life of 5.2 years (December 31, 2013 - 2.9%, AA and 6.2 years, respectively). The Company’s agency mortgage-backed fixed maturity investments are primarily priced by pricing services using a mortgage pool specific model which utilizes daily inputs from the active to be announced market which is very liquid, as well as the U.S. treasury market. The model also utilizes additional information, such as the weighted average maturity, weighted average coupon and other available pool level data which is provided by the sponsoring agency. Valuations are also corroborated with daily active market quotes.
Non-agency mortgage-backed
Level 2 - The Company’s non-agency mortgage-backed fixed maturity investments include non-agency prime residential mortgage-backed and non-agency Alt-A fixed maturity investments. The Company has no fixed maturity investments classified as sub-prime held in its fixed maturity investments portfolio. At June 30, 2014, the Company’s non-agency prime residential mortgage-backed fixed maturity investments have a weighted average effective yield of 3.2%, a weighted average credit quality of non-investment grade, and a weighted average life of 4.3 years (December 31, 2013 - 3.7%, BBB and 4.4 years, respectively). The Company’s non-agency Alt-A fixed maturity investments held at June 30, 2014 have a weighted average effective yield of 4.0%, a weighted average credit quality of non-investment grade and a weighted average life of 4.5 years (December 31, 2013 - 4.7%, non-investment grade and 4.0 years, respectively). Securities held in these sectors are primarily priced by pricing services using an option adjusted spread model or other relevant models, which principally utilize inputs including benchmark yields, available trade information or broker quotes, and issuer spreads. The pricing services also review collateral prepayment speeds, loss severity and delinquencies among other collateral performance indicators for the securities valuation, when applicable.
Commercial mortgage-backed
Level 2 - The Company’s commercial mortgage-backed fixed maturity investments held at June 30, 2014 have a weighted average effective yield of 2.0%, a weighted average credit quality of AA, and a weighted average life of 3.9 years (December 31, 2013 - 2.1%, AA and 3.3 years, respectively). Securities held in these sectors are primarily priced by pricing services. The pricing services apply dealer quotes and other available trade information such as bid and offers, prepayment speeds which may be adjusted for the underlying collateral or current price data, the U.S. treasury curve and swap curve as well as cash settlement. The pricing services discount the expected cash flows for each security held in this sector using a spread adjusted benchmark yield based on the characteristics of the security.
Asset-backed
Level 2 - At June 30, 2014, the Company’s asset-backed fixed maturity investments had a weighted average effective yield of 1.3%, a weighted average credit quality of AAA and a weighted average life of 2.4 years (December 31, 2013 - 2.0%, AAA and 3.5 years, respectively). The underlying collateral for the Company’s asset-backed fixed maturity investments primarily consists of student loans, credit card receivables, auto loans and other receivables. Securities held in these sectors are primarily priced by pricing services. The pricing services apply dealer quotes and other available trade information such as bids and offers, prepayment speeds which may be adjusted for the underlying collateral or current price data, the U.S. treasury curve and swap curve as well as cash settlement. The pricing services determine the expected cash flows for each security held in this sector using historical prepayment and default projections for the underlying collateral and current market data. In addition, a spread is applied to the relevant benchmark and used to discount the cash flows noted above to determine the fair value of the securities held in this sector.
Short Term Investments
Level 2 - The fair value of the Company’s portfolio of short term investments is generally determined using amortized cost which approximates fair value and, in certain cases, in a manner similar to the Company’s fixed maturity investments noted above.
Equity Investments, Classified as Trading
Level 1 - The fair value of the Company’s portfolio of equity investments, classified as trading is primarily priced by pricing services, reflecting the closing price quoted for the final trading day of the period. When pricing these securities, the pricing services utilize daily data from many real time market sources, including applicable securities exchanges. All data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source was used for each security.
Other investments
Catastrophe bonds
Level 2 - The Company’s other investments include investments in catastrophe bonds which are recorded at fair value based on broker or underwriter bid indications.
Other assets and liabilities
Derivatives
Level 1 and Level 2 - Other assets and liabilities include certain derivatives entered into by the Company. The fair value of these transactions includes certain exchange traded foreign currency forward contracts which are considered Level 1, and certain credit derivatives, determined using standard industry valuation models and considered Level 2, as the inputs to the valuation model are based on observable market inputs, including credit spreads, credit ratings of the underlying referenced security, the risk free rate and the contract term.
Other
Level 2 - The liabilities measured at fair value and included in Level 2 at June 30, 2014 of $5.2 million are comprised of cash settled restricted stock units (“CSRSU”) that form part of the Company’s compensation program. The fair value of the Company’s CSRSUs is determined using observable exchange traded prices for the Company’s common shares.
Level 3 Assets and Liabilities Measured at Fair Value
Below is a summary of quantitative information regarding the significant observable and unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis:
	At June 30, 2014	Fair Value			Valuation Technique		Unobservable (U)	Low			High			Weighted Average or Actual
		(Level 3)					and Observable (O)
							Inputs
	Fixed maturity investments
	Corporate	$	15,938		Discounted cash flow (“DCF”)		Credit spread (U)	n/a			n/a			1.1	%
							Liquidity discount (U)	n/a			n/a			1	%
							Risk-free rate (O)	n/a			n/a			0.3	%
							Dividend rate (O)	n/a			n/a			6.2	%
	Corporate	30,238			Internal valuation model		Private transaction (U)	n/a			n/a			See below
	Total fixed maturity investments	46,176
	Other investments
	Private equity partnerships	314,983			Net asset valuation		Estimated performance (U)	(3.0	)%		18.9	%		4	%
	Senior secured bank loan funds	15,976			Net asset valuation		Estimated performance (U)	n/a			n/a			0.7	%
	Hedge funds	3,190			Net asset valuation		Estimated performance (U)	0	%		0	%		0	%
	Total other investments	334,149
	Other assets and (liabilities)
	Weather contract	(1,149		)	Internal valuation model		See below	n/a			n/a			See below
	Call rights	2,220			Internal valuation model		See below	n/a			n/a			See below
	Total other assets and (liabilities)	1,071
		$	381,396
Fixed Maturity Investments
Corporate
Level 3 - Included in the Company’s corporate fixed maturity investments is an investment in the preferred equity of an insurance holding company with a fair value of $15.9 million at June 30, 2014. The Company measures the fair value of this investment using a DCF model and seeks to incorporate all relevant information reasonably available. The Company considers the contractual agreement which stipulates the methodology for calculating a dividend rate to be paid upon liquidation, conversion or redemption. At June 30, 2014, the dividend rate was 6.2%. In addition, the Company has estimated a liquidity discount of 1.0%, a risk-free rate of 0.3% and a credit spread of 1.1%. To ensure the estimate for fair value determined using the DCF model is reasonable, the Company reviews private market comparables of similar investments, if available, and in particular, credit ratings of other private market comparables for similar investments to determine the appropriateness of its estimate of fair value using a DCF model. The fair value of the Company’s investment in this corporate fixed maturity investment determined by a DCF model is positively correlated to the dividend rate, and inversely correlated to the credit spread, liquidity discount and the risk-free rate.
In addition, the Company’s corporate fixed maturity investments include an investment in the convertible preferred equity of Trupanion, Inc., a company that provides insurance for a variety of veterinarian costs (“Trupanion”), which investment had a fair value of $30.2 million at June 30, 2014. The Company measured the fair value of this investment using a third party valuation, which included, but was not limited to, discounted cash flow analysis, financial statement analysis, budgets and forecasts and capital transactions. In circumstances where a private market transaction has recently occurred, the Company will evaluate the comparability of the private market transactions to the fair value of its investment and determine if the third party valuation is still appropriate. The fair value of this investment was positively correlated to the estimated fair value of the aggregate equity of the investee as provided in the third party valuation report.
On July 18, 2014, Trupanion’s common stock began publicly trading on the New York Stock Exchange ("NYSE"). Effective immediately prior to the closing of the initial public offering, the Company’s investment in the convertible preferred equity of Trupanion was converted into 2.5 million common shares of Trupanion. Using the closing share price of Trupanion’s common stock on July 28, 2014, the value of the Company's 2.5 million common shares of Trupanion was $25.1 million.  Following the initial public offering, the Company expects its investment in Trupanion will be included in its portfolio of equity investments trading on its consolidated balance sheet and any realized and unrealized gains or losses related to Trupanion from the initial public offering price will be included in net realized and unrealized gains (losses) on investments on the Company's consolidated statements of operations in the period in which they occur.  The Company has agreed, subject to certain exceptions, not to dispose of or hedge any of the shares of Trupanion it holds prior to January 14, 2015.
Other investments
Private equity partnerships
Level 3 - Included in the Company’s $315.0 million of investments in private equity partnerships at June 30, 2014 are alternative asset limited partnerships (or similar corporate structures) that invest in certain private equity asset classes including U.S. and global leveraged buyouts; mezzanine investments; distressed securities; real estate; and oil, gas and power. The fair value of private equity partnership investments is based on current estimated net asset values established in accordance with the governing documents of such investments and is obtained from the investment manager or general partner of the respective entity. The type of underlying investments held by the investee which form the basis of the net asset valuation include assets such as private business ventures, for which the Company does not have access to financial information. As a result, the Company is unable to corroborate the fair value measurement of the underlying investments of the private equity partnership and therefore requires significant management judgment to determine the fair value of the private equity partnership. In circumstances where there is a reporting lag between the current period end reporting date and the reporting date of the latest fund valuation, the Company estimates the fair value of these funds by starting with the prior quarter-end fund valuations, adjusting these valuations for actual capital calls, redemptions or distributions, as well as the impact of changes in foreign currency exchange rates, and then estimating the return for the current period. In circumstances in which the Company estimates the return for the current period, all relevant information reasonably available to the Company is utilized. This principally includes preliminary estimates reported to the Company by its fund managers, obtaining the valuation of underlying portfolio investments where such underlying investments are publicly traded and therefore have a readily observable price, using information that is available to the Company with respect to the underlying investments, reviewing various indices for similar investments or asset classes, as well as estimating returns based on the results of similar types of investments for which the Company has obtained reported results, or other valuation methods, where possible. The range of such current estimated periodic returns for the three months ended June 30, 2014 was negative 3.0% to positive 18.9% with a weighted average of positive 4.0%. The fair value of the Company’s investment in private equity partnerships is positively correlated to the estimated periodic rate of return. The Company also considers factors such as recent financial information, the value of capital transactions with the partnership and management’s judgment regarding whether any adjustments should be made to the net asset value. For each respective private equity partnership, the Company obtains and reviews the valuation methodology used by the investment manager or general partner and the latest audited annual financial statements to attempt to ensure that the investment partnership is following fair value principles consistent with GAAP in determining the net asset value of each limited partner’s interest.
Senior secured bank loan funds
Level 3 - The Company has $16.0 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. The Company’s investments in these funds are valued using estimated monthly net asset valuations received from the investment manager. The lock up provisions in these funds result in a lack of current observable market transactions between the fund participants and the funds, and therefore the Company considers the fair value of its investment in these funds to be determined using Level 3 inputs. The Company obtains and reviews the latest audited annual financial statements to attempt to ensure that these funds are following fair value principles consistent with GAAP in determining the net asset value. The fair value of the Company’s investment in senior secured bank loan funds is positively correlated to the estimated monthly net asset valuations received from the investment manager.
Hedge funds
Level 3 - The Company has $3.2 million of hedge fund investments that are invested in so called “side pockets” or illiquid investments. In these instances, the Company generally does not have the right to redeem its interest, and as such, the Company classifies this portion of its investment as Level 3. The fair value of these illiquid investments is determined by adjusting the previous periods’ reported net asset value (generally one month in arrears) for an estimated periodic rate of return obtained from the respective investment manager.
For each respective hedge fund investment, the Company obtains and reviews the valuation methodology used by the investment manager and the latest audited annual financial statements to attempt to ensure that the hedge fund investment is following fair value principles consistent with GAAP in determining the net asset value.
Other assets and liabilities
Weather Contract
Level 3 - The Company has a $1.1 million liability related to a weather contract entered into with an insurance company, with the fair value determined through the use of an internal valuation model. Inputs to the internal valuation model are based on proprietary data as observable market inputs are not available.  The most significant unobservable input is the potential payment that would become due to a counterparty following the occurrence of a triggering event as reported by an external agency.  Generally, an increase (decrease) in the potential payment would result in an increase (decrease) to the fair value of the Company’s weather contract liability.
Call Rights
Level 3 - The Company has an agreement with a counterparty that gives the counterparty the right to purchase shares the Company has in certain of its equity method investees at a price above the Company’s current carrying value for those investments. The agreement is considered a derivative for accounting purposes and the Company’s estimated fair value of the agreement is $2.2 million at June 30, 2014. The fair value is based on an internal valuation model which incorporates the estimated intrinsic value of the agreement, the time value of money, and the likelihood of the agreement being exercised and ultimately settled. The fair value of the agreement is positively correlated to the tangible GAAP book value of the underlying equity method investees as well as the likelihood of the agreement being exercised and ultimately settled.
Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation.
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Fixed maturity			Other			Other assets				Total
		investments			investments			and
		trading						(liabilities)
	Balance - April 1, 2014	$	37,138		$	342,778		$	(1,307	)		$	378,609
	Total unrealized gains (losses)
	Included in net investment income	9,038			1,579			179				10,796
	Included in other loss	—			—			2,220				2,220
	Total foreign exchange gains	—			(205		)	(21		)		(226		)
	Purchases	—			10,391			—				10,391
	Settlements	—			(20,394		)	—				(20,394		)
	Balance - June 30, 2014	$	46,176		$	334,149		$	1,071			$	381,396
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	9,038		$	1,579		$	179			$	10,796
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in other loss	$	—		$	—		$	2,220			$	2,220
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Fixed maturity			Other			Other assets				Total
		investments			investments			and
		trading						(liabilities)
	Balance - January 1, 2014	$	27,580		$	344,248		$	(2,490	)		$	369,338
	Total unrealized gains (losses)
	Included in net investment income	18,596			9,455			1,395				29,446
	Included in other loss	—			—			2,220				2,220
	Total foreign exchange gains	—			(199		)	(54		)		(253		)
	Purchases	—			25,392			—				25,392
	Settlements	—			(44,747		)	—				(44,747		)
	Balance - June 30, 2014	$	46,176		$	334,149		$	1,071			$	381,396
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	18,596		$	9,455		$	1,395			$	29,446
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in other loss	$	—		$	—		$	2,220			$	2,220
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Fixed maturity			Other			Other assets  and (liabilities)				Total
		investments			investments
		trading
	Balance - April 1, 2013	$	28,067		$	402,206		$	1,301			$	431,574
	Total unrealized gains (losses)
	Included in net investment income	114			(2,373		)	—				(2,259		)
	Total realized losses
	Included in other income (loss)	—			—			(676		)		(676		)
	Total foreign exchange gains	—			364			—				364
	Purchases	—			18,411			—				18,411
	Sales	—			424			—				424
	Settlements	(2,500		)	(25,328		)	—				(27,828		)
	Balance - June 30, 2013	$	25,681		$	393,704		$	625			$	420,010
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	114		$	(2,373	)	$	—			$	(2,259	)
		Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Fixed maturity			Other			Other assets  and (liabilities)				Total
		investments			investments
		trading
	Balance - January 1, 2013	$	27,792		$	381,067		$	21,513			$	430,372
	Total unrealized gains (losses)
	Included in net investment income	389			10,643			—				11,032
	Total realized losses
	Included in other income (loss)	—			—			(2,646		)		(2,646		)
	Total foreign exchange gains	—			(417		)	—				(417		)
	Purchases	—			29,196			—				29,196
	Settlements	(2,500		)	(45,027		)	—				(47,527		)
	Reclassified from other assets to other investments	—			18,242			(18,242		)		—
	Balance - June 30, 2013	$	25,681		$	393,704		$	625			$	420,010
	Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	389		$	10,643		$	—			$	11,032
Financial Instruments Disclosed, But Not Carried, at Fair Value
The Company uses various financial instruments in the normal course of its business. The Company’s insurance contracts are excluded from the fair value of financial instruments accounting guidance, unless the Company elects the fair value option, and therefore, are not included in the amounts discussed herein. The carrying values of cash, accrued interest, receivables for investments sold, certain other assets, payables for investments purchased, certain other liabilities, and other financial instruments not included herein approximated their fair values.
Senior Notes
In March 2010, RenRe North America Holdings Inc. (“RRNAH”) issued $250.0 million of 5.75% Senior Notes due March 15, 2020, with interest on the notes payable on March 15 and September 15 of each year. At June 30, 2014, the fair value of the 5.75% Senior Notes was $269.7 million (December 31, 2013 – $273.9 million).
The fair value of RRNAH’s 5.75% Senior Notes is determined using indicative market pricing obtained from third-party service providers, which the Company considers Level 2 in the fair value hierarchy. There have been no changes during the period in the Company’s valuation technique used to determine the fair value of the Senior Notes.
The Fair Value Option for Financial Assets and Financial Liabilities
The Company has elected to account for certain financial assets and financial liabilities at fair value using the guidance under FASB ASC Topic Financial Instruments as the Company believes it represents the most meaningful measurement basis for these assets and liabilities. Below is a summary of the balances the Company has elected to account for at fair value:
		June 30,			December 31,
		2014			2013
	Other investments	$	513,614		$	573,264
Included in net investment income for the three and six months ended June 30, 2014 was net unrealized gains of $3.9 million and gains of $8.9 million, respectively, related to the changes in fair value of other investments (2013 – losses of $5.3 million and gains of $9.8 million, respectively).
Measuring the Fair Value of Other Investments Using Net Asset Valuations
The table below shows the Company’s portfolio of other investments measured using net asset valuations:
	At June 30, 2014	Fair Value			Unfunded			Redemption Frequency		Redemption		Redemption
					Commitments					Notice Period (Minimum Days)		Notice Period (Maximum Days)
	Private equity partnerships	$	314,983		$	84,529		See below		See below		See below
	Senior secured bank loan funds	15,976			9,272			See below		See below		See below
	Hedge funds	3,190			—			See below		See below		See below
	Total other investments measured using net asset valuations	$	334,149		$	93,801
Private equity partnerships – Included in the Company’s investments in private equity partnerships are alternative asset limited partnerships (or similar corporate structures) that invest in certain private equity asset classes including U.S. and global leveraged buyouts; mezzanine investments; distressed securities; real estate; and oil, gas and power. The fair values of the investments in this category have been estimated in respect of the net asset value of the investments, as discussed in detail above. The Company generally has no right to redeem its interest in any of these private equity partnerships in advance of dissolution of the applicable private equity partnership. Instead, the nature of these investments is that distributions are received by the Company in connection with the liquidation of the underlying assets of the respective private equity partnership. It is estimated that the majority of the underlying assets of the limited partnerships would liquidate over 7 to 10 years from inception of the respective limited partnership.
Senior secured bank loan funds – The Company has $16.0 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. The Company’s investments in these funds are valued using estimated monthly net asset valuations received from the investment manager, as discussed in detail above. It is estimated that the majority of the underlying assets in the closed end funds would liquidate over 4 to 5 years from inception of the respective fund.
Hedge funds – The Company invests in hedge funds that pursue multiple strategies. The fair values of the investments in this category are estimated using the net asset value per share of the funds, as discussed in detail above. The Company’s investments in hedge funds at June 30, 2014 are $3.2 million of so called “side pocket” investments which are not redeemable at the option of the shareholder. The Company will retain its interest in the side pocket investments referred to above, until the underlying investments attributable to such side pockets are liquidated, realized or deemed realized at the discretion of the fund manager.

Reinsurance

Reinsurance	6 Months Ended
	Jun. 30, 2014
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]	'
Reinsurance	'
	REINSURANCE
	The Company purchases reinsurance and other protection to manage its risk portfolio and to reduce its exposure to large losses. The Company currently has in place contracts that provide for recovery of a portion of certain claims and claim expenses, generally in excess of various retentions or on a proportional basis. In addition to loss recoveries, certain of the Company’s ceded reinsurance contracts provide for recoveries of additional premiums, for reinstatement premiums and for lost no-claims bonuses, which are incurred when losses are ceded to other reinsurance contracts. The Company remains liable to the extent that any reinsurance company fails to meet its obligations.
	The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Premiums written
		Direct	$	19,707		$	16,333		$	33,562		$	26,650
		Assumed	491,833			686,890			1,183,238			1,311,991
		Ceded	(165,133		)	(144,114		)	(420,046		)	(342,719		)
		Net premiums written	$	346,407		$	559,109		$	796,754		$	995,922
		Premiums earned
		Direct	$	14,949		$	10,789		$	29,178		$	20,662
		Assumed	350,389			380,626			735,987			747,479
		Ceded	(104,922		)	(99,526		)	(218,215		)	(204,997		)
		Net premiums earned	$	260,416		$	291,889		$	546,950		$	563,144
		Claims and claim expenses
		Gross claims and claim expenses incurred	$	97,064		$	116,995		$	165,214		$	150,993
		Claims and claim expenses recovered	(15,676		)	(13,033		)	(24,911		)	(19,780		)
		Net claims and claim expenses incurred	$	81,388		$	103,962		$	140,303		$	131,213

Noncontrolling_Interests

Noncontrolling Interests	6 Months Ended
	Jun. 30, 2014
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]	'
Noncontrolling Interests	'
	NONCONTROLLING INTERESTS
	A summary of the Company’s noncontrolling interests on its consolidated balance sheets is set forth below:
			June 30,			December 31, 2013
			2014
		Redeemable noncontrolling interest - DaVinciRe	$	930,231		$	1,063,368
		Redeemable noncontrolling interest - Medici	93,661			36,492
		Redeemable noncontrolling interest	$	1,023,892		$	1,099,860
	A summary of the Company’s noncontrolling interests on its consolidated statements of operations set forth below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Redeemable noncontrolling interest - DaVinciRe	$	35,706		$	14,009		$	76,886		$	52,824
		Redeemable noncontrolling interest - Medici	372			7			1,960			7
		Noncontrolling interest - Angus Fund	—			(1		)	—			(209		)
		Net income attributable to noncontrolling interests	$	36,078		$	14,015		$	78,846		$	52,622
	Redeemable Noncontrolling Interest – DaVinciRe
	In October 2001, the Company formed DaVinciRe and DaVinci with other equity investors. RenaissanceRe owns a noncontrolling economic interest in DaVinciRe; however, because RenaissanceRe controls a majority of DaVinciRe’s outstanding voting rights, the consolidated financial statements of DaVinciRe are included in the consolidated financial statements of the Company. The portion of DaVinciRe’s earnings owned by third parties is recorded in the consolidated statements of operations as net income attributable to noncontrolling interests. The Company’s noncontrolling economic ownership in DaVinciRe was 26.5% at June 30, 2014 (December 31, 2013 - 27.3%).
	DaVinciRe shareholders are party to a shareholders agreement (the “Shareholders Agreement”) which provides DaVinciRe shareholders, excluding RenaissanceRe, with certain redemption rights that enable each shareholder to notify DaVinciRe of such shareholder’s desire for DaVinciRe to repurchase up to half of such shareholder’s initial aggregate number of shares held, subject to certain limitations, such as limiting the aggregate of all share repurchase requests to 25% of DaVinciRe’s capital in any given year and satisfying all applicable regulatory requirements. If total shareholder requests exceed 25% of DaVinciRe’s capital, the number of shares repurchased will be reduced among the requesting shareholders pro-rata, based on the amounts desired to be repurchased. Shareholders desiring to have DaVinci repurchase their shares must notify DaVinciRe before March 1 of each year. The repurchase price will be based on GAAP book value as of the end of the year in which the shareholder notice is given, and the repurchase will be effective as of such date. Payment will be made by April 1 of the following year, following delivery of the audited financial statements for the year in which the repurchase was effective. The repurchase price is subject to a true-up for development on outstanding loss reserves after settlement of all claims relating to the applicable years.
	2013
	During January 2013, DaVinciRe redeemed shares from certain DaVinciRe shareholders (including those who submitted redemption notices in advance of the March 1, 2012 annual redemption notice date, as discussed above) while certain other DaVinciRe shareholders purchased additional shares in DaVinciRe. The net redemption as a result of these transactions was $150.0 million. In connection with the redemptions, DaVinciRe retained a $20.5 million holdback. The Company’s noncontrolling economic ownership in DaVinciRe was 30.8% at December 31, 2012 and subsequent to the above transactions, the Company’s noncontrolling economic ownership in DaVinciRe increased to 32.9% effective January 1, 2013.
	Effective October 1, 2013, an existing third party shareholder sold a portion of its shares in DaVinciRe to a new third party shareholder.  In addition, effective October 1, 2013, the Company sold a portion of its shares of DaVinciRe to the same new third party shareholder.  The Company sold these shares for $77.4 million and subsequent to the above transactions, its noncontrolling economic ownership interest in DaVinciRe decreased, and was 27.3% at December 31, 2013.
	2014
	During January 2014, DaVinciRe redeemed a portion of its outstanding shares from all existing DaVinciRe shareholders, including the Company, while a new DaVinciRe shareholder purchased shares in DaVinciRe. The net redemption as a result of these transactions was $300.0 million. In connection with the redemption, DaVinciRe retained a $60.0 million holdback. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions is 26.5%, effective January 1, 2014. During February 2014, DaVinciRe paid $30.0 million of the $60.0 million holdback. There were no additional payments of the holdback during the second quarter of 2014.
	See “Note 15. Subsequent Events” for additional information related to DaVinciRe transactions which occurred subsequent to June 30, 2014.
	The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time.
	The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	895,391		$	875,770		$	1,063,368		$	968,259
		Redemption of shares from redeemable noncontrolling interest	(866		)	(663		)	(219,745		)	(186,894		)
		Sale of shares to redeemable noncontrolling interests	—			—			9,722			54,927
		Net income attributable to redeemable noncontrolling interest	35,706			14,009			76,886			52,824
		Ending balance	$	930,231		$	889,116		$	930,231		$	889,116
	Redeemable Noncontrolling Interest - RenaissanceRe Medici Fund Ltd. (“Medici”)
	Medici is an exempted company incorporated under the laws of Bermuda and its objective is to seek to invest substantially all of its assets in various insurance-based investment instruments that have returns primarily tied to property catastrophe risk. RenaissanceRe owns a noncontrolling economic interest in Medici; however, because RenaissanceRe controls all of Medici’s outstanding voting rights, the financial statements of Medici are included in the consolidated financial statements of the Company. The portion of Medici’s earnings owned by third parties is recorded in the consolidated statements of operations as net income attributable to noncontrolling interests. Any shareholder may redeem all or any portion of its shares as of the last day of any calendar month, upon at least 30 calendar days’ prior irrevocable written notice to Medici. As the participating, non-voting common shares of Medici have redemption features which are outside the control of the issuer, the portion related to the redeemable noncontrolling interest in Medici is recorded in the mezzanine section of the consolidated balance sheets of the Company.
	2013
	Prior to June 1, 2013, Medici was a wholly owned subsidiary of RenaissanceRe Fund Holdings Ltd., which in turn is a wholly owned subsidiary of RenaissanceRe. Subsequent to June 1, 2013, third-party investors subscribed for, and redeemed, an aggregate of $37.2 million and $1.3 million, respectively, of the participating, non-voting common shares of Medici. As a result of the third-party investments during the period from June 1, 2013 through December 31, 2013, the Company’s economic ownership in Medici was 73.9% at December 31, 2013.
	2014
	During the six months ended June 30, 2014, third-party investors subscribed for and redeemed an aggregate of $57.1 million and $1.9 million, respectively, of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s economic ownership in Medici decreased to 49.3%, effective June 30, 2014.
	The Company expects its ownership in Medici to fluctuate over time.
	The activity in redeemable noncontrolling interest – Medici is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	91,590		$	—		$	36,492		$	—
		Redemption of shares from redeemable noncontrolling interest	—			—			(1,875		)	—
		Sale of shares to redeemable noncontrolling interests	1,699			8,000			57,084			8,000
		Net income attributable to redeemable noncontrolling interest	372			7			1,960			7
		Ending balance	$	93,661		$	8,007		$	93,661		$	8,007
	Noncontrolling Interest - Angus Fund L.P. (the “Angus Fund”)
	In December 2010, REAL and RRCA, both formerly wholly owned subsidiaries of RenaissanceRe, formed the Angus Fund with other equity investors. The Angus Fund was formed to provide capital to and make investments in companies primarily in the heating oil and propane distribution industries and Angus Partners LLC (“Angus”) was formed to provide commodity related risk management products to third party customers.
	As part of the agreement to sell REAL to Munich (see “Note 3. Discontinued Operations” for additional information), the former general partner of the Angus Fund, REAL, transferred its general partner ownership interest to RRV U.S. Holdings LLC, a wholly owned subsidiary of RenaissanceRe, representing a $55 thousand investment in the Angus Fund, or a 1.1% ownership interest, and RRCA, a former limited partner, transferred its limited partner ownership interest to RenTech U.S. Holdings LLC (“RenTech”), a wholly owned subsidiary of RenaissanceRe, representing a $2.0 million investment in the Angus Fund, or a 35.0% ownership interest. There was no gain or loss recognized on the above transactions.
	Effective December 1, 2013, both RRV U.S. and RenTech contributed their ownership interests in the Angus Fund to Angus for $2.3 million, in return for equity interests in Angus. The Company previously had an equity interest of 38.8% in Angus, and as a result of these transactions, its equity interest in Angus increased to 42.5%. In addition, these transactions resulted in $1.7 million of additional goodwill related to the Company’s additional investment in Angus. During the first quarter of 2014, Angus raised additional capital from its existing third party investors. The Company did not participate in this capital raise and, as a result, the Company’s ownership interest in Angus is 40.4% at June 30, 2014. The Company records its equity investment in Angus one quarter in arrears.
	Prior to December 1, 2013, the Angus Fund met the definition of a VIE; therefore the Company evaluated its ownership in the Angus Fund to determine if it was the primary beneficiary. The Company had concluded it was the primary beneficiary of the Angus Fund as it had the power to direct, and had more than insignificant economic interest in, the activities of the Angus Fund and as such, the financial position and results of operations of the Angus Fund were consolidated. The portion of the Angus Fund’s earnings owned by third parties was recorded in the consolidated statements of operations as net income attributable to noncontrolling interest. Effective December 1, 2013, the Company concluded that it no longer had the power to direct the activities, nor was it the primary beneficiary, of the Angus Fund and as a result, it was deconsolidated. At June 30, 2014 and December 31, 2013, the Company’s equity investment in Angus is recorded under investments in other ventures, under equity method on the Company’s consolidated balance sheets.
	The activity in noncontrolling interest – Angus Fund is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	—		$	3,747		$	—		$	3,991
		Adjustment of ownership interest	—			—			—			139
		Net loss attributable to noncontrolling interest	—			(1		)	—			(209		)
		Dividends on common shares	—			(53		)	—			(228		)
		Ending balance	$	—		$	3,693		$	—		$	3,693

Variable_Interest_Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Variable Interest Entities	'
	VARIABLE INTEREST ENTITIES
	Upsilon RFO
	Effective January 1, 2013, the Company formed and launched Upsilon RFO, a managed joint venture, and a Bermuda domiciled SPI, to provide additional capacity to the worldwide aggregate and per-occurrence retrocessional property catastrophe excess of loss market.
	The shareholders (other than the Class A shareholder) participate in substantially all of the profits or losses of Upsilon RFO while their shares remain outstanding. The shareholders (other than the Class A shareholder) indemnify Upsilon RFO against losses relating to insurance risk and therefore these shares have been accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance. Both Upsilon RFO and the insurance participation are managed by RUM in return for an expense override and profit commission.
	Upsilon RFO is considered a VIE as it has insufficient equity capital to finance its activities without additional financial support. The Company is the primary beneficiary of Upsilon RFO as it: (i) has the power over the activities that most significantly impact the economic performance of Upsilon RFO and (ii) has the obligation to absorb the losses, and right to receive the benefits, in accordance with the accounting guidance, that could be significant to Upsilon RFO. As a result, the Company consolidates Upsilon RFO and all significant inter-company transactions have been eliminated. The Company has not provided financial or other support to Upsilon RFO that was not contractually required to be provided.
	2013
	Original business was written directly by Upsilon RFO and included $53.5 million of gross premiums written incepting January 1, 2013 under fully-collateralized reinsurance contracts. In conjunction with the formation and launch of Upsilon RFO, $61.0 million of Upsilon RFO non-voting Class B shares were sold to unaffiliated third party investors. Additionally, $76.4 million of the non-voting Class B shares were acquired by the Company, representing a 55.6% participation in the original risks assumed by Upsilon RFO effective January 1, 2013. In addition, another third party investor supplied $17.5 million of capital through an insurance contract with the Company related to Upsilon RFO’s reinsurance portfolio. Inclusive of the insurance contract, the Company had a 42.9% participation in the original risks assumed by Upsilon RFO effective January 1, 2013.
	On July 1, 2013, the Company sold a portion of its shares of Upsilon RFO to a new third party shareholder for $25.0 million. The Company’s participation in the original risks assumed by Upsilon RFO prior to January 1, 2014 was 25.8%, inclusive of the related insurance contract, effective December 31, 2013.
	Original business written directly by Upsilon RFO and incepting during 2013 has expired, and the associated non-voting Class B share capital contributed by unaffiliated third party investors and the Company has been settled in full. No additional business or non-voting Class B share capital remains outstanding related to original business incepted during 2013.
	2014
	In conjunction with risks incepting during the first quarter of 2014, $172.4 million of Upsilon RFO non-voting preference shares were sold to unaffiliated third-party investors.  Additionally, $109.7 million of the non-voting preference shares were acquired by the Company, representing a 38.9% participation in the risks assumed by Upsilon RFO incepting during the first quarter of 2014.  In addition, another third party investor supplied $15.0 million of capital through an insurance contract with the Company related to Upsilon RFO’s reinsurance portfolio.  Inclusive of the insurance contract, the Company has a 33.6% participation in the original risks assumed by Upsilon RFO in conjunction with risks incepting during the first quarter of 2014.
	In conjunction with risks incepting during the second quarter of 2014, $43.1 million of Upsilon RFO non-voting preference shares were sold to unaffiliated third-party investors.  Additionally, $13.5 million of the non-voting preference shares were acquired by the Company, representing a 23.9% participation in the risks assumed by Upsilon RFO incepting during the second quarter of 2014.  In addition, another third party investor supplied $5.0 million of capital through an insurance contract with the Company related to Upsilon RFO’s reinsurance portfolio.  Inclusive of the insurance contract, the Company has a 15.0% participation in the original risks assumed by Upsilon RFO in conjunction with risks incepting during the second quarter of 2014.
	At June 30, 2014, the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $487.0 million and $487.0 million, respectively (December 31, 2013 - $474.2 million and $474.2 million, respectively, including $156.3 million of capital raised from third party investors and received by Upsilon RFO prior to December 31, 2013 for risks incepted during the first quarter of 2014).
	Inclusive of all capital raised for risks incepting during the first six months of 2014, the Company has a 30.5% participation in the original risks assumed by Upsilon RFO for the period from January 1, 2014 through June 30, 2014.
	Mona Lisa Re Ltd. (“Mona Lisa Re”)
	On March 14, 2013, Mona Lisa Re was licensed as a Bermuda domiciled SPI to provide reinsurance capacity to subsidiaries of RenaissanceRe, namely Renaissance Reinsurance and DaVinci, through reinsurance agreements which will be collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes (“Notes”) to third-party investors.
	Upon issuance of a series of Notes by Mona Lisa Re, all of the proceeds from the issuance are expected to be deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance and/or DaVinci underlying such series of Notes. The outstanding principal amount of each series of Notes generally will be returned to holders of such Notes upon the expiration of the risk period underlying such Notes, unless an event occurs which causes a loss under the applicable series of Notes, in which case the amount returned will be reduced by such noteholder’s pro rata share of such loss, as specified in the applicable governing documents of such Notes. In addition, holders of Notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of Notes.
	The Company concluded that Mona Lisa Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. Therefore, the Company evaluated its relationship with Mona Lisa Re and concluded it does not have a variable interest in Mona Lisa Re. As a result, the financial position and results of operations of Mona Lisa Re are not consolidated by the Company. At June 30, 2014, the total assets and total liabilities of Mona Lisa Re were $179.1 million and $179.1 million, respectively (December 31, 2013 - $209.6 million and $209.6 million, respectively).
	The only transactions related to Mona Lisa Re that are recorded in the Company’s consolidated financial statements are the ceded reinsurance agreements entered into by Renaissance Reinsurance and DaVinci which are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance. Renaissance Reinsurance and DaVinci have together entered into ceded reinsurance contracts with Mona Lisa Re with gross premiums ceded of $2.0 million and $1.9 million, respectively, during the six months ended June 30, 2014 (2013 - $1.2 million and $1.2 million, respectively). In addition, Renaissance Reinsurance and DaVinci recognized ceded premiums earned related to the ceded reinsurance contracts with Mona Lisa Re of $5.0 million and $3.6 million, respectively, during the six months ended June 30, 2014 (2013 - $0.3 million and $0.3 million, respectively).

Shareholders_Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	SHAREHOLDERS’ EQUITY
	The Board of Directors of RenaissanceRe declared, and RenaissanceRe paid, a dividend of $0.29 per common share to shareholders of record on March 14, 2014 and June 13, 2014. During the six months ended June 30, 2014, the Company declared and paid $11.2 million in preference share dividends (2013 - $13.8 million) and $23.6 million in common share dividends (2013 - $24.7 million).
	The Company’s share repurchase program may be effected from time to time, depending on market conditions and other factors, through open market purchases and privately negotiated transactions. Unless terminated earlier by resolution of RenaissanceRe’s Board of Directors, the program will expire when the Company has repurchased the full value of the shares authorized. The Company’s decision to repurchase common shares will depend on, among other matters, the market price of the common shares and the capital requirements of the Company. During the six months ended June 30, 2014, the Company repurchased an aggregate of 3.4 million shares in open market transactions, at an aggregate cost of $314.5 million, and at an average share price of $93.53. On May 20, 2014, RenaissanceRe’s Board of Directors approved a renewal of the Company’s authorized share repurchase program for an aggregate amount of $500.0 million. At June 30, 2014, $500.0 million remained available for repurchase under the Board authorized share repurchase program. See “Part II, Item 2 - Unregistered Sales of Equity Securities and use of Proceeds” for additional information.
	In March 2004, RenaissanceRe raised $250.0 million through the issuance of 10 million Series C Preference Shares at $25 per share; in December 2006, RenaissanceRe raised $300.0 million through the issuance of 12 million Series D Preference Shares at $25 per share; and in May 2013, RenaissanceRe raised $275.0 million through the issuance of 11 million Series E Preference Shares at $25 per share. On December 27, 2012, the Company redeemed 6 million Series D Preference Shares for $150.0 million plus accrued and unpaid dividends thereon. Following the redemption, 6 million Series D Preference Shares remained outstanding. In May 2013, RenaissanceRe announced a mandatory redemption of the remaining 6 million of its outstanding Series D Preference Shares, using the proceeds from the issuance of the Series E Preference Shares, and on June 27, 2013 RenaissanceRe redeemed the remaining 6 million Series D Preference Shares called for redemption for $150.0 million million plus accrued and unpaid dividends thereon. Following the redemption, no Series D Preference Shares remain outstanding. In addition, in May 2013, RenaissanceRe announced a mandatory partial redemption of 5 million of its outstanding Series C Preference Shares, using the proceeds from the issuance of the Series E Preference Shares. The partial redemption was allocated by random lottery in accordance with the Depository Trust Company’s rules and procedures and on June 27, 2013 RenaissanceRe redeemed the 5 million Series C Preference Shares called for redemption for $125.0 million plus accrued and unpaid dividends thereon. Following the redemption, 5 million Series C Preference Shares remain outstanding.
	The Series E Preference Shares and the remaining Series C Preference Shares may be redeemed at $25 per share plus certain dividends at RenaissanceRe’s option on or after June 1, 2018 and March 23, 2009, respectively. Dividends on the Series C Preference Shares are cumulative from the date of original issuance and are payable quarterly in arrears at 6.08% per annum, when, if, and as declared by the Board of Directors. Dividends on the Series E Preference Shares will be payable from the date of original issuance on a non-cumulative basis, only when, as and if declared by the Board of Directors, quarterly in arrears at 5.375% per annum. Unless certain dividend payments are made on the preference shares, RenaissanceRe will be restricted from paying any dividends on its common shares. The preference shares have no stated maturity and are not convertible into any other securities of RenaissanceRe. Generally, the preference shares have no voting rights. Whenever dividends payable on the preference shares are in arrears (whether or not such dividends have been earned or declared) in an amount equivalent to dividends for six full dividend periods (whether or not consecutive), the holders of the preference shares, voting as a single class regardless of class or series, will have the right to elect two directors to the Board of Directors of RenaissanceRe.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	EARNINGS PER SHARE
	The following table sets forth the computation of basic and diluted earnings per common share:
			Three months ended June 30,						Six months ended June 30,
		(thousands of shares)	2014			2013			2014			2013
		Numerator:
		Net income available to RenaissanceRe common shareholders	$	120,752		$	26,806		$	271,755		$	217,280
		Amount allocated to participating common shareholders (1)	(1,557		)	(376		)	(3,577		)	(3,174		)
		Net income allocated to RenaissanceRe common shareholders	$	119,195		$	26,430		$	268,178		$	214,106
		Denominator:
		Denominator for basic income per RenaissanceRe common share - weighted average common shares	39,736			43,372			40,487			43,453
		Per common share equivalents of employee stock options and restricted shares	659			871			662			850
		Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	40,395			44,243			41,149			44,303
		Net income available to RenaissanceRe common shareholders per common share – basic	$	3		$	0.61		$	6.62		$	4.93
		Net income available to RenaissanceRe common shareholders per common share – diluted	$	2.95		$	0.6		$	6.52		$	4.83
	-1	Represents earnings attributable to holders of unvested restricted shares issued under the Company’s 2001 Stock Incentive Plan and Non-Employee Director Stock Incentive Plan.

Segment_Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2014
Segment Reporting, Measurement Disclosures [Abstract]	'
Segment Reporting	'
	SEGMENT REPORTING
	The Company has the following reportable segments: (1) Catastrophe Reinsurance, which includes catastrophe reinsurance and certain property catastrophe joint ventures managed by the Company’s ventures unit; (2) Specialty Reinsurance, which includes specialty reinsurance and certain specialty joint ventures managed by the Company’s ventures unit; and (3) Lloyd’s, which includes reinsurance and insurance business written through Syndicate 1458. RenaissanceRe CCL, an indirect wholly owned subsidiary of RenaissanceRe, is the sole corporate member of Syndicate 1458. All prior periods presented have been reclassified to conform to this presentation.
	The financial results of the Company’s strategic investments, former Insurance segment, discontinued operations related to REAL and current noncontrolling interests are included in the Other category of the Company’s segment results. Also included in the Other category of the Company’s segment results are the Company’s investments in other ventures, investments unit, corporate expenses and capital servicing costs.
	The Company does not manage its assets by segment; accordingly, net investment income and total assets are not allocated to the segments.
	A summary of the significant components of the Company’s revenues and expenses is as follows:
		Three months ended June 30, 2014	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written	$	388,083		$	51,554		$	71,903		$	—		$	511,540
		Net premiums written	$	233,698		$	46,254		$	66,452		$	3		$	346,407
		Net premiums earned	$	159,152		$	53,588		$	47,672		$	4		$	260,416
		Net claims and claim expenses incurred	36,730			20,075			25,111			(528		)	81,388
		Acquisition expenses	17,806			11,699			10,122			(6,150		)	33,477
		Operational expenses	22,200			10,514			13,058			69			45,841
		Underwriting income (loss)	$	82,416		$	11,300		$	(619	)	$	6,613		99,710
		Net investment income										34,541			34,541
		Net foreign exchange gains										2,392			2,392
		Equity in earnings of other ventures										7,232			7,232
		Other loss										(535		)	(535		)
		Net realized and unrealized gains on investments										27,128			27,128
		Corporate expenses										(3,954		)	(3,954		)
		Interest expense										(4,292		)	(4,292		)
		Income before taxes and noncontrolling interests													162,222
		Income tax benefit										204			204
		Net income attributable to noncontrolling interests										(36,078		)	(36,078		)
		Dividends on preference shares										(5,596		)	(5,596		)
		Net income available to RenaissanceRe common shareholders													$	120,752
		Net claims and claim expenses incurred – current accident year	$	38,473		$	25,443		$	34,555		$	—		$	98,471
		Net claims and claim expenses incurred – prior accident years	(1,743		)	(5,368		)	(9,444		)	(528		)	(17,083		)
		Net claims and claim expenses incurred – total	$	36,730		$	20,075		$	25,111		$	(528	)	$	81,388
		Net claims and claim expense ratio – current accident year	24.2		%	47.5		%	72.5		%	—		%	37.8		%
		Net claims and claim expense ratio – prior accident years	(1.1		)%	(10.0		)%	(19.8		)%	(13,200.0		)%	(6.5		)%
		Net claims and claim expense ratio – calendar year	23.1		%	37.5		%	52.7		%	(13,200.0		)%	31.3		%
		Underwriting expense ratio	25.1		%	41.4		%	48.6		%	(152,025.0		)%	30.4		%
		Combined ratio	48.2		%	78.9		%	101.3		%	(165,225.0		)%	61.7		%
		Six months ended June 30, 2014	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written	$	855,794		$	205,844		$	155,162		$	—		$	1,216,800
		Net premiums written	$	493,187		$	171,743		$	131,821		$	3		$	796,754
		Net premiums earned	$	323,736		$	123,218		$	99,969		$	27		$	546,950
		Net claims and claim expenses incurred	43,185			46,156			51,392			(430		)	140,303
		Acquisition expenses	24,932			28,246			20,689			(6,690		)	67,177
		Operational expenses	42,619			20,620			25,091			135			88,465
		Underwriting income	$	213,000		$	28,196		$	2,797		$	7,012		251,005
		Net investment income										73,489			73,489
		Net foreign exchange gains										1,331			1,331
		Equity in earnings of other ventures										11,431			11,431
		Other loss										(473		)	(473		)
		Net realized and unrealized gains on investments										42,055			42,055
		Corporate expenses										(8,499		)	(8,499		)
		Interest expense										(8,585		)	(8,585		)
		Income before taxes and noncontrolling interests													361,754
		Income tax benefit										38			38
		Net income attributable to noncontrolling interests										(78,846		)	(78,846		)
		Dividends on preference shares										(11,191		)	(11,191		)
		Net income available to RenaissanceRe common shareholders													$	271,755
		Net claims and claim expenses incurred – current accident year	$	51,002		$	67,365		$	55,712		$	—		$	174,079
		Net claims and claim expenses incurred – prior accident years	(7,817		)	(21,209		)	(4,320		)	(430		)	(33,776		)
		Net claims and claim expenses incurred – total	$	43,185		$	46,156		$	51,392		$	(430	)	$	140,303
		Net claims and claim expense ratio – current accident year	15.8		%	54.7		%	55.7		%	—		%	31.8		%
		Net claims and claim expense ratio – prior accident years	(2.5		)%	(17.2		)%	(4.3		)%	(1,592.6		)%	(6.1		)%
		Net claims and claim expense ratio – calendar year	13.3		%	37.5		%	51.4		%	(1,592.6		)%	25.7		%
		Underwriting expense ratio	20.9		%	39.6		%	45.8		%	(24,277.8		)%	28.4		%
		Combined ratio	34.2		%	77.1		%	97.2		%	(25,870.4		)%	54.1		%
		Three months ended June 30, 2013	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written (1)	$	576,903		$	58,539		$	68,769		$	(988	)	$	703,223
	Net premiums written	$	436,852		$	57,348		$	64,643		$	266		$	559,109
	Net premiums earned	$	200,483		$	49,206		$	41,933		$	267		$	291,889
	Net claims and claim expenses incurred	52,915			25,511			25,536			—			103,962
	Acquisition expenses	14,197			9,009			8,484			77			31,767
	Operational expenses	23,599			7,595			11,456			139			42,789
	Underwriting income (loss)	$	109,772		$	7,091		$	(3,543	)	$	51		113,371
	Net investment income										26,163			26,163
	Net foreign exchange losses										(932		)	(932		)
	Equity in earnings of other ventures										3,772			3,772
	Other loss										(1,128		)	(1,128		)
	Net realized and unrealized losses on investments										(69,529		)	(69,529		)
	Corporate expenses										(21,529		)	(21,529		)
	Interest expense										(4,300		)	(4,300		)
	Income from continuing operations before taxes													45,888
	Income tax expense										(11		)	(11		)
	Income from discontinued operations										2,427			2,427
	Net income attributable to noncontrolling interests										(14,015		)	(14,015		)
	Dividends on preference shares										(7,483		)	(7,483		)
	Net income attributable to RenaissanceRe common shareholders													$	26,806
	Net claims and claim expenses incurred – current accident year	$	71,369		$	30,903		$	28,517		$	—		$	130,789
	Net claims and claim expenses incurred – prior accident years	(18,454		)	(5,392		)	(2,981		)	—			(26,827		)
	Net claims and claim expenses incurred – total	$	52,915		$	25,511		$	25,536		$	—		$	103,962
	Net claims and claim expense ratio – current accident year	35.6		%	62.8		%	68		%	—		%	44.8		%
	Net claims and claim expense ratio – prior accident years	(9.2		)%	(11.0		)%	(7.1		)%	—		%	(9.2		)%
	Net claims and claim expense ratio – calendar year	26.4		%	51.8		%	60.9		%	—		%	35.6		%
	Underwriting expense ratio	18.8		%	33.8		%	47.5		%	80.9		%	25.6		%
	Combined ratio	45.2		%	85.6		%	108.4		%	80.9		%	61.2		%
(1) Included in gross premiums written in the Other category is the elimination of inter-segment gross premiums written of $1.0 million.
	Six months ended June 30, 2013	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
	Gross premiums written (1)	$	1,055,699		$	140,869		$	143,061		$	(988	)	$	1,338,641
	Net premiums written	$	742,205		$	132,867		$	120,567		$	283		$	995,922
	Net premiums earned	$	387,134		$	96,015		$	79,712		$	283		$	563,144
	Net claims and claim expenses incurred	55,623			36,203			40,064			(677		)	131,213
	Acquisition expenses	23,817			17,448			15,400			111			56,776
	Operational expenses	49,714			15,155			23,634			272			88,775
	Underwriting income	$	257,980		$	27,209		$	614		$	577		286,380
	Net investment income										69,365			69,365
	Net foreign exchange losses										(318		)	(318		)
	Equity in earnings of other ventures										9,607			9,607
	Other loss										(2,837		)	(2,837		)
	Net realized and unrealized losses on investments										(55,260		)	(55,260		)
	Corporate expenses										(26,011		)	(26,011		)
	Interest expense										(9,334		)	(9,334		)
	Income from continuing operations before taxes													271,592
	Income tax expense										(133		)	(133		)
	Income from discontinued operations										12,201			12,201
	Net income attributable to noncontrolling interests										(52,622		)	(52,622		)
	Dividends on preference shares										(13,758		)	(13,758		)
	Net income attributable to RenaissanceRe common shareholders													$	217,280
	Net claims and claim expenses incurred – current accident year	$	92,545		$	56,756		$	46,388		$	—		$	195,689
	Net claims and claim expenses incurred – prior accident years	(36,922		)	(20,553		)	(6,324		)	(677		)	(64,476		)
	Net claims and claim expenses incurred – total	$	55,623		$	36,203		$	40,064		$	(677	)	$	131,213
	Net claims and claim expense ratio – current accident year	23.9		%	59.1		%	58.2		%	—		%	34.7		%
	Net claims and claim expense ratio – prior accident years	(9.5		)%	(21.4		)%	(7.9		)%	(239.2		)%	(11.4		)%
	Net claims and claim expense ratio – calendar year	14.4		%	37.7		%	50.3		%	(239.2		)%	23.3		%
	Underwriting expense ratio	19		%	34		%	48.9		%	135.3		%	25.9		%
	Combined ratio	33.4		%	71.7		%	99.2		%	(103.9		)%	49.2		%
(1) Included in gross premiums written in the Other category is the elimination of inter-segment gross premiums written of $1.0 million.

Derivative_Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2014
Summary of Derivative Instruments [Abstract]	'
Derivative Instruments	'
	DERIVATIVE INSTRUMENTS
	The Company enters into derivative instruments such as futures, options, swaps, forward contracts and other derivative contracts primarily to manage its foreign currency exposure, obtain exposure to a particular financial market, for yield enhancement, or for trading and speculation. The Company accounts for its derivatives in accordance with FASB ASC Topic Derivatives and Hedging, which requires all derivatives to be recorded at fair value on the Company’s balance sheet as either assets or liabilities, depending on the rights or obligations of the derivatives, with changes in fair value reflected in current earnings. The Company does not currently apply hedge accounting in respect of any positions reflected in its consolidated financial statements. The Company’s derivative instruments are generally traded under International Swaps and Derivatives Association master agreements, which establish the terms of the transactions entered into with the Company’s derivative counterparties. In the event one party becomes insolvent or otherwise defaults on its obligations, a master agreement generally permits the non-defaulting party to accelerate and terminate all outstanding transactions and net the transactions’ marked-to-market values so that a single sum in a single currency will be owed by, or owed to, the non-defaulting party. Effectively, this contractual close-out netting reduces credit exposure from gross to net exposure. Where the Company has entered into master netting agreements with counterparties, or the Company has the legal and contractual right to offset positions, the derivative positions are generally netted by counterparty and are reported accordingly in other assets and other liabilities.
	The tables below show the gross and net amounts of recognized derivative assets and liabilities, including the location on the consolidated balance sheets and fair value of the Company’s principal derivative instruments:
			Derivative Assets
		At June 30, 2014	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Balance Sheet				Net Amounts of Assets Presented in the Balance Sheet		Balance Sheet Location	Collateral		Net Amount
		Interest rate futures	$	190			189				$	1	Other assets	$	—	$	1
		Foreign currency forward contracts (1)	10,764				3,747				7,017		Other assets	—		7,017
		Foreign currency forward contracts (2)	249				238				11		Other assets	—		11
		Credit default swaps	730				33				697		Other assets	570		127
		Call rights	2,220				—				2,220		Other assets	—		2,220
		Total	$	14,153			$	4,207			$	9,946		$	570	$	9,376
			Derivative Liabilities
		At June 30, 2014	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Balance Sheet				Net Amounts of Liabilities Presented in the Balance Sheet		Balance Sheet Location	Collateral Pledged		Net Amount
		Interest rate futures	$	530			189				$	341	Other liabilities	$	331	$	10
		Foreign currency forward contracts (1)	1,042				—				1,042		Other liabilities	—		1,042
		Foreign currency forward contracts (2)	1,151				238				913		Other liabilities	—		913
		Credit default swaps	43				33				10		Other liabilities	—		10
		Weather contract	1,149				—				1,149		Other liabilities	—		1,149
		Total	$	3,915			$	460			$	3,455		$	331	$	3,124
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.
			Derivative Assets
		At December 31, 2013	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Balance Sheet				Net Amounts of Assets Presented in the Balance Sheet		Balance Sheet Location	Collateral		Net Amount
		Interest rate futures	$	897			62				$	835	Other assets	$	—	$	835
		Foreign currency forward contracts (1)	9,612				1,179				8,433		Other assets	—		8,433
		Foreign currency forward contracts (2)	1,013				338				675		Other assets	—		675
		Credit default swaps	806				82				724		Other assets	310		414
		Total	$	12,328			$	1,661			$	10,667		$	310	$	10,357
			Derivative Liabilities
		At December 31, 2013	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Balance Sheet				Net Amounts of Liabilities Presented in the Balance Sheet		Balance Sheet Location	Collateral Pledged		Net Amount
		Interest rate futures	$	74			62				$	12	Other liabilities	$	12	$	—
		Foreign currency forward contracts (1)	2,204				28				2,176		Other liabilities	—		2,176
		Foreign currency forward contracts (2)	1,557				338				1,219		Other liabilities	—		1,219
		Credit default swaps	94				82				12		Other liabilities	—		12
		Weather contract	2,490				—				2,490		Other liabilities	—		2,490
		Total	$	6,419			$	510			$	5,909		$	12	$	5,897
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.
	Refer to “Note 4. Investments” for information on reverse repurchase agreements.
	The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its principal derivative instruments are shown in the following table:
			Location of gain (loss)		Amount of gain (loss) recognized on
			recognized on derivatives		derivatives
		Three months ended June 30,			2014				2013
		Interest rate futures	Net realized and unrealized gains (losses) on investments		$	(7,362	)		$	20,203
		Foreign currency forward contracts (1)	Net foreign exchange gains (losses)		(1,990		)		(13,264		)
		Foreign currency forward contracts (2)	Net foreign exchange gains (losses)		58				(332		)
		Credit default swaps	Net realized and unrealized gains (losses) on investments		299				292
		Weather contract	Net realized and unrealized gains (losses) on investments		179				—
		Call rights	Other loss		2,220				—
		Total			$	(6,596	)		$	6,899
			Location of gain (loss)		Amount of gain (loss) recognized on
			recognized on derivatives		derivatives
		Six months ended June 30,			2014				2013
		Interest rate futures	Net realized and unrealized gains (losses) on investments		$	(19,636	)		$	20,205
		Foreign currency forward contracts (1)	Net foreign exchange gains (losses)		2,109				(10,876		)
		Foreign currency forward contracts (2)	Net foreign exchange gains (losses)		(1,341		)		1,346
		Credit default swaps	Net realized and unrealized gains (losses) on investments		458				726
		Weather contract	Net realized and unrealized gains (losses) on investments		1,395				—
		Call rights	Other loss		2,220				—
		Total			$	(14,795	)		$	11,401
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.
	The Company is not aware of the existence of any credit-risk related contingent features that it believes would be triggered in its derivative instruments that are in a net liability position at June 30, 2014.
Interest Rate Futures
The Company uses interest rate futures within its portfolio of fixed maturity investments to manage its exposure to interest rate risk, which can include increasing or decreasing its exposure to this risk. At June 30, 2014, the Company had $523.5 million of notional long positions and $667.4 million of notional short positions of primarily Eurodollar, U.S. treasury and non-U.S. dollar futures contracts (December 31, 2013 - $1,169.3 million and $356.6 million, respectively). The fair value of these derivatives is determined using exchange traded prices.
Foreign Currency Derivatives
The Company’s functional currency is the U.S. dollar. The Company writes a portion of its business in currencies other than U.S. dollars and may, from time to time, experience foreign exchange gains and losses in the Company’s consolidated financial statements. All changes in exchange rates, with the exception of non-monetary assets and liabilities, are recognized currently in the Company’s consolidated statements of operations.
Underwriting Operations Related Foreign Currency Contracts
The Company’s foreign currency policy with regard to its underwriting operations is generally to hold foreign currency assets, including cash, investments and receivables that approximate the foreign currency liabilities, including claims and claim expense reserves and reinsurance balances payable. When necessary, the Company may use foreign currency forward and option contracts to minimize the effect of fluctuating foreign currencies on the value of non-U.S. dollar denominated assets and liabilities associated with its underwriting operations. The fair value of the Company’s underwriting operations related foreign currency contracts is determined using indicative pricing obtained from counterparties or broker quotes. At June 30, 2014, the Company had outstanding underwriting related foreign currency contracts of $163.6 million in notional long positions and $235.5 million in notional short positions, denominated in U.S. dollars (December 31, 2013 - $263.6 million and $139.8 million, respectively).
Investment Portfolio Related Foreign Currency Forward Contracts
The Company’s investment operations are exposed to currency fluctuations through its investments in non-U.S. dollar fixed maturity investments, short term investments and other investments. To economically hedge its exposure to currency fluctuations from these investments, the Company has entered into foreign currency forward contracts. Foreign exchange (losses) gains associated with the Company’s hedging of these non-U.S. dollar investments are recorded in net foreign exchange (losses) gains in its consolidated statements of operations. The fair value of the Company’s investment portfolio related foreign currency forward contracts is determined using an interpolated rate based on closing forward market rates. At June 30, 2014, the Company had outstanding investment portfolio related foreign currency contracts of $41.6 million in notional long positions and $153.1 million in notional short positions, denominated in U.S. dollars (December 31, 2013 - $39.6 million and $159.1 million, respectively).
Credit Derivatives
The Company’s exposure to credit risk is primarily due to its fixed maturity investments, short term investments, premiums receivable and reinsurance recoverable.  From time to time, the Company purchases credit derivatives to hedge its exposures in the insurance industry, and to assist in managing the credit risk associated with ceded reinsurance.  The Company also employs credit derivatives in its investment portfolio to either assume credit risk or hedge its credit exposure. The fair value of the credit derivatives is determined using industry valuation models, broker bid indications or internal pricing valuation techniques.  The fair value of these credit derivatives can change based on a variety of factors including changes in credit spreads, default rates and recovery rates, the correlation of credit risk between the referenced credit and the counterparty, and market rate inputs such as interest rates. At June 30, 2014, the Company had outstanding credit derivatives of $5.0 million in notional long positions and $25.1 million in notional short positions, denominated in U.S. dollars (December 31, 2013 - $7.1 million and $18.4 million, respectively).
Weather Contract
The Company, from time to time, transacts in certain derivative-based risk management products that address weather-related risks. The fair value of these contracts is determined through the use of an internal valuation model with the inputs to the internal valuation model based on proprietary data as observable market inputs are not available.  The most significant unobservable input is the potential payment that would become due to a counterparty following the occurrence of a triggering event as reported by an external agency.  Generally, the Company’s portfolio of such derivatives is relatively small and such derivatives are frequently seasonal in nature. At June 30, 2014, the Company had an outstanding weather contract with an insurance company of $6.7 million in a notional short position (December 31, 2013 - $6.4 million).
Call Rights
The Company has an agreement with a counterparty that gives the counterparty the right to purchase shares the Company has in certain of its equity method investees at a price above the Company’s current carrying value for those investments. The agreement is considered a derivative for accounting purposes and the Company’s estimated fair value of the agreement is $2.2 million at June 30, 2014. The fair value is based on an internal valuation model which incorporates the estimated intrinsic value of the agreement, the time value of money, and the likelihood of the agreement being exercised and ultimately settled.

Commitments_Contingencies_and_

Commitments, Contingencies and Other Items	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments, Contingencies and Other Items	'
	COMMITMENTS, CONTINGENCIES AND OTHER ITEMS
	There are no material changes from the commitments and contingencies previously disclosed in the Company’s Form 10-K for the year ended December 31, 2013, other than those discussed below.
	Syndicated Letter of Credit Facility
	Effective as of March 31, 2014, RenaissanceRe reduced the commitments under its syndicated letter of credit facility from $250.0 million to $180.0 million, and effective June 30, 2014, RenaissanceRe further reduced the commitments under its syndicated letter of credit facility from $180.0 million to $100.0 million. The reductions were implemented in connection with a reassessment of the future collateral needs of RenaissanceRe, taking into account, among other things, its access to alternative sources of credit enhancement. Prior to the expiration date of May 17, 2015 and after giving effect to the reduction noted above, the commitments may, subject to the satisfaction of certain conditions, be increased from time to time up to an aggregate amount not to exceed $450.0 million.
	Legal Proceedings
	The Company and its subsidiaries are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on reinsurance treaties or contracts or direct surplus lines insurance policies.  This category of business litigation may involve allegations of underwriting or claims-handling errors or misconduct, employment claims, regulatory actions or disputes arising from the Company’s business ventures.  The Company’s operating subsidiaries are subject to claims litigation involving, among other things, disputed interpretations of policy coverages.  Generally, the Company’s direct surplus lines insurance operations are subject to greater frequency and diversity of claims and claims-related litigation than its reinsurance operations and, in some jurisdictions, may be subject to direct actions by allegedly injured persons or entities seeking damages from policyholders.  These lawsuits, involving claims on policies issued by the Company’s subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in its loss and loss expense reserves.  In addition, the Company may from time to time engage in litigation or arbitration related to its claims for payment in respect of ceded reinsurance, including disputes that challenge the Company’s ability to enforce its underwriting intent. Such matters could result, directly or indirectly, in providers of protection not meeting their obligations to the Company or not doing so on a timely basis. The Company may also be subject to other disputes from time to time, relating to operational or other matters distinct from insurance or reinsurance claims. Any litigation or arbitration, or regulatory process, contains an element of uncertainty, and the value of an exposure or a gain contingency related to a dispute is difficult to estimate accordingly. Currently, the Company believes that no individual litigation or arbitration to which it is presently a party is likely to have a material adverse effect on its financial condition, business or operations.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries	6 Months Ended
	Jun. 30, 2014
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]	'
Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries	'
	CONDENSED CONSOLIDATING FINANCIAL INFORMATION PROVIDED IN CONNECTION WITH OUTSTANDING DEBT OF SUBSIDIARIES
	The following tables present condensed consolidating balance sheets at June 30, 2014 and December 31, 2013, condensed consolidating statements of operations and condensed consolidating statements of comprehensive income for the three and six months ended June 30, 2014, and condensed consolidating statements of cash flow for the six months ended June 30, 2014 and 2013, respectively, for RenaissanceRe, RRNAH and RenaissanceRe’s other subsidiaries. RRNAH is a 100% owned subsidiary of RenaissanceRe.
	On March 17, 2010, RRNAH issued, and RenaissanceRe guaranteed, $250.0 million of 5.75% Senior Notes due March 15, 2020, with interest on the notes payable on March 15 and September 15. The notes can be redeemed by RRNAH prior to maturity, subject to payment of a “make-whole” premium. The notes, which are senior obligations, contain various covenants, including limitations on mergers and consolidations, restrictions as to the disposition of the stock of designated subsidiaries and limitations on liens of the stock of designated subsidiaries.
	Condensed Consolidating Balance Sheet at June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
		Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Assets
	Total investments	$	168,982		$	98,580		$	6,439,340		$	—		$	6,706,902
	Cash and cash equivalents	3,194			3,211			288,052			—			294,457
	Investments in subsidiaries	3,473,208			72,077			—			(3,545,285		)	—
	Due from subsidiaries and affiliates	141,812			24			—			(141,836		)	—
	Premiums receivable	—			—			837,116			—			837,116
	Prepaid reinsurance premiums	—			—			267,963			—			267,963
	Reinsurance recoverable	—			—			85,115			—			85,115
	Accrued investment income	179			124			27,716			—			28,019
	Deferred acquisition costs	—			—			140,765			—			140,765
	Receivable for investments sold	8			4			58,193			—			58,205
	Other assets	113,130			1,362			84,049			(101,458		)	97,083
	Total assets	$	3,900,513		$	175,382		$	8,228,309		$	(3,788,579	)	$	8,515,625
	Liabilities, Noncontrolling Interests and Shareholders’ Equity
	Liabilities
	Reserve for claims and claim expenses	$	—		$	—		$	1,552,618		$	—		$	1,552,618
	Unearned premiums	—			—			929,523			—			929,523
	Debt	—			249,476			—			—			249,476
	Amounts due to subsidiaries and affiliates	53,698			2,420			—			(56,118		)	—
	Reinsurance balances payable	—			—			558,185			—			558,185
	Payable for investments purchased	—			73			201,267			—			201,340
	Other liabilities	10,874			7,495			147,739			(1,458		)	164,650
	Total liabilities	64,572			259,464			3,389,332			(57,576		)	3,655,792
	Redeemable noncontrolling interest – DaVinciRe	—			—			1,023,892			—			1,023,892
	Shareholders’ Equity
	Total shareholders’ equity	3,835,941			(84,082		)	3,815,085			(3,731,003		)	3,835,941
	Total liabilities, noncontrolling interests and shareholders’ equity	$	3,900,513		$	175,382		$	8,228,309		$	(3,788,579	)	$	8,515,625
	-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
	-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
	Condensed Consolidating Balance Sheet at December 31, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
		Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Assets
	Total investments	$	210,719		$	98,784		$	6,512,209		$	—		$	6,821,712
	Cash and cash equivalents	8,796			4,027			395,209			—			408,032
	Investments in subsidiaries	3,294,729			74,718			—			(3,369,447		)	—
	Due from subsidiaries and affiliates	296,752			—			—			(296,752		)	—
	Premiums receivable	—			—			474,087			—			474,087
	Prepaid reinsurance premiums	—			—			66,132			—			66,132
	Reinsurance recoverable	—			—			101,025			—			101,025
	Accrued investment income	—			110			33,955			—			34,065
	Deferred acquisition costs	—			—			81,684			—			81,684
	Receivable for investments sold	14			—			75,831			—			75,845
	Other assets	112,234			1,481			102,834			(100,000		)	116,549
	Total assets	$	3,923,244		$	179,120		$	7,842,966		$	(3,766,199	)	$	8,179,131
	Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity
	Liabilities
Reserve for claims and claim expenses	$	—		$	—		$	1,563,730		$	—		$	1,563,730
Unearned premiums	—			—			477,888			—			477,888
Debt	—			249,430			—			—			249,430
Amounts due to subsidiaries and affiliates	—			3,173			—			(3,173		)	—
Reinsurance balances payable	—			—			293,022			—			293,022
Payable for investments purchased	—			—			193,221			—			193,221
Other liabilities	18,860			6,953			371,783			—			397,596
Total liabilities	18,860			259,556			2,899,644			(3,173		)	3,174,887
Redeemable noncontrolling interest	—			—			1,099,860			—			1,099,860
Shareholders’ Equity
Total shareholders’ equity	3,904,384			(80,436		)	3,843,462			(3,763,026		)	3,904,384
Total liabilities, redeemable noncontrolling interest and shareholders’ equity	$	3,923,244		$	179,120		$	7,842,966		$	(3,766,199	)	$	8,179,131
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations for	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
the three months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries and
				Issuer)			Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	260,416		$	—		$	260,416
Net investment income	736			445			34,293			(933		)	34,541
Net foreign exchange gains	6			—			2,386			—			2,392
Equity in earnings of other ventures	—			—			7,232			—			7,232
Other loss	—			—			(535		)	—			(535		)
Net realized and unrealized gains on investments	190			4,340			22,598			—			27,128
Total revenues	932			4,785			326,390			(933		)	331,174
Expenses
Net claims and claim expenses incurred	—			—			81,388			—			81,388
Acquisition expenses	—			—			33,477			—			33,477
Operational expenses	(1,236		)	1,684			45,483			(90		)	45,841
Corporate expenses	3,468			59			427			—			3,954
Interest expense	—			3,616			676			—			4,292
Total expenses	2,232			5,359			161,451			(90		)	168,952
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(1,300		)	(574		)	164,939			(843		)	162,222
Equity in net income (loss) of subsidiaries	127,648			(38		)	—			(127,610		)	—
Income (loss) before taxes	126,348			(612		)	164,939			(128,453		)	162,222
Income tax (expense) benefit	—			(38		)	242			—			204
Net income (loss)	126,348			(650		)	165,181			(128,453		)	162,426
Net income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
Net income (loss) attributable to RenaissanceRe	126,348			(650		)	129,103			(128,453		)	126,348
Dividends on preference shares	(5,596		)	—			—			—			(5,596		)
Net income (loss) attributable to RenaissanceRe common shareholders	$	120,752		$	(650	)	$	129,103		$	(128,453	)	$	120,752
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	126,348		$	(650	)	$	165,181		$	(128,453	)	$	162,426
Change in net unrealized gains on investments	—			—			(45		)	—			(45		)
Comprehensive income (loss)	126,348			(650		)	165,136			(128,453		)	162,381
Net income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
Comprehensive income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
Comprehensive income (loss) attributable to RenaissanceRe	$	126,348		$	(650	)	$	129,058		$	(128,453	)	$	126,303
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations for	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
the six months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries and
				Issuer)			Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	546,950		$	—		$	546,950
Net investment income	1,361			919			73,079			(1,870		)	73,489
Net foreign exchange gains	7			—			1,324			—			1,331
Equity in earnings of other ventures	—			—			11,431			—			11,431
Other loss	—			(8		)	(465		)	—			(473		)
Net realized and unrealized (losses) gains on investments	84			4,717			37,254			—			42,055
Total revenues	1,452			5,628			669,573			(1,870		)	674,783
Expenses
Net claims and claim expenses incurred	—			—			140,303			—			140,303
Acquisition expenses	—			—			67,177			—			67,177
Operational expenses	(2,116		)	3,578			87,171			(168		)	88,465
Corporate expenses	7,470			118			911			—			8,499
Interest expense	—			7,233			1,352			—			8,585
Total expenses	5,354			10,929			296,914			(168		)	313,029
(Loss) income before equity in net income of subsidiaries and taxes	(3,902		)	(5,301		)	372,659			(1,702		)	361,754
Equity in net income of subsidiaries	286,848			815			—			(287,663		)	—
Income (loss) before taxes	282,946			(4,486		)	372,659			(289,365		)	361,754
Income tax benefit (expense)	—			646			(608		)	—			38
Net income (loss)	282,946			(3,840		)	372,051			(289,365		)	361,792
Net income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Net income (loss) attributable to RenaissanceRe	282,946			(3,840		)	293,205			(289,365		)	282,946
Dividends on preference shares	(11,191		)	—			—			—			(11,191		)
Net income (loss) attributable to RenaissanceRe common shareholders	$	271,755		$	(3,840	)	$	293,205		$	(289,365	)	$	271,755
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the six months ended June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	282,946		$	(3,840	)	$	372,051		$	(289,365	)	$	361,792
Change in net unrealized gains on investments	—			—			(213		)	—			(213		)
Comprehensive income (loss)	282,946			(3,840		)	371,838			(289,365		)	361,579
Net income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Comprehensive income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Comprehensive income (loss) attributable to RenaissanceRe	$	282,946		$	(3,840	)	$	292,992		$	(289,365	)	$	282,733
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
for the three months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	291,889		$	—		$	291,889
Net investment income	668			37			26,403			(945		)	26,163
Net foreign exchange losses	—			(2		)	(930		)	—			(932		)
Equity in earnings of other ventures	—			—			3,772			—			3,772
Other loss	—			—			(1,128		)	—			(1,128		)
Net realized and unrealized losses on investments	(158		)	(145		)	(69,226		)	—			(69,529		)
Total revenues	510			(110		)	250,780			(945		)	250,235
Expenses
Net claims and claim expenses incurred	—			—			103,962			—			103,962
Acquisition expenses	—			—			31,767			—			31,767
Operational expenses	(1,241		)	1,568			42,314			148			42,789
Corporate expenses	21,007			59			463			—			21,529
Interest expense	—			3,616			684			—			4,300
Total expenses	19,766			5,243			179,190			148			204,347
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(19,256		)	(5,353		)	71,590			(1,093		)	45,888
Equity in net income (loss) of subsidiaries	53,545			(4,197		)	—			(49,348		)	—
Income (loss) from continuing operations before taxes	34,289			(9,550		)	71,590			(50,441		)	45,888
Income tax (expense) benefit	—			(313		)	302			—			(11		)
Income (loss) from continuing operations	34,289			(9,863		)	71,892			(50,441		)	45,877
Income from discontinued operations	—			2,427			—			—			2,427
Net income (loss)	34,289			(7,436		)	71,892			(50,441		)	48,304
Net income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Net income (loss) attributable to RenaissanceRe	34,289			(7,436		)	57,877			(50,441		)	34,289
Dividends on preference shares	(7,483		)	—			—			—			(7,483		)
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$	26,806		$	(7,436	)	$	57,877		$	(50,441	)	$	26,806
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended June 30, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	34,289		$	(7,436	)	$	71,892		$	(50,441	)	$	48,304
Change in net unrealized gains on investments	—			—			(1,141		)	—			(1,141		)
Comprehensive income (loss)	34,289			(7,436		)	70,751			(50,441		)	47,163
Net income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Comprehensive income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Comprehensive income (loss) attributable to RenaissanceRe	$	34,289		$	(7,436	)	$	56,736		$	(50,441	)	$	33,148
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
for the six months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	563,144		$	—		$	563,144
Net investment income	2,218			236			68,808			(1,897		)	69,365
Net foreign exchange losses	(50		)	(2		)	(266		)	—			(318		)
Equity in earnings of other ventures	—			—			9,607			—			9,607
Other income (loss)	106			—			(2,943		)	—			(2,837		)
Net realized and unrealized losses on investments	(1,444		)	(114		)	(53,702		)	—			(55,260		)
Total revenues	830			120			584,648			(1,897		)	583,701
Expenses
Net claims and claim expenses incurred	—			—			131,213			—			131,213
Acquisition expenses	—			—			56,776			—			56,776
Operational expenses	(2,463		)	4,017			87,221			—			88,775
Corporate expenses	24,909			118			984			—			26,011
Interest expense	734			7,233			1,367			—			9,334
Total expenses	23,180			11,368			277,561			—			312,109
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(22,350		)	(11,248		)	307,087			(1,897		)	271,592
Equity in net income of subsidiaries	253,388			(3,838		)	—			(249,550		)	—
Income (loss) from continuing operations before taxes	231,038			(15,086		)	307,087			(251,447		)	271,592
Income tax expense	—			(5		)	(128		)	—			(133		)
Income (loss) from continuing operations	231,038			(15,091		)	306,959			(251,447		)	271,459
Income from discontinued operations	—			12,201			—			—			12,201
Net income (loss)	231,038			(2,890		)	306,960			(251,448		)	283,660
Net income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Net income (loss) attributable to RenaissanceRe	231,038			(2,890		)	254,338			(251,448		)	231,038
Dividends on preference shares	(13,758		)	—			—			—			(13,758		)
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$	217,280		$	(2,890	)	$	254,338		$	(251,448	)	$	217,280
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the six months ended June 30, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	231,038		$	(2,890	)	$	306,960		$	(251,448	)	$	283,660
Change in net unrealized gains on investments	—			—			(8,713		)	—			(8,713		)
Comprehensive income (loss)	231,038			(2,890		)	298,247			(251,448		)	274,947
Net income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Comprehensive income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Comprehensive income (loss) attributable to RenaissanceRe	$	231,038		$	(2,890	)	$	245,625		$	(251,448	)	$	222,325
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Cash Flows	RenaissanceRe			RenRe North			Other			RenaissanceRe
for the six months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$	(14,828	)	$	(8,410	)	$	196,624		$	173,386
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	4,912			5,353			4,009,909			4,020,174
Purchases of fixed maturity investments trading	(79,714		)	—			(3,890,603		)	(3,970,317		)
Proceeds from sales and maturities of fixed maturity investments available for sale	—			—			5,114			5,114
Net sales of equity investments trading	—			(370		)	(10,776		)	(11,146		)
Net sales (purchases) of short term investments	116,511			(68		)	(26,894		)	89,549
Net sales of other investments	—			—			68,684			68,684
Net sales of investments in other ventures	—			—			1,030			1,030
Net purchases of other assets	—			—			6,000			6,000
Dividends and return of capital from subsidiaries	359,891			5,406			(365,297		)	—
Contributions to subsidiaries	(47,220		)	(1,950		)	49,170			—
Due to (from) subsidiary	4,123			(777		)	(3,346		)	—
Net cash provided by (used in) investing activities	358,503			7,594			(157,009		)	209,088
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(23,550		)	—			—			(23,550		)
Dividends paid – preference shares	(11,191		)	—			—			(11,191		)
RenaissanceRe common share repurchases	(314,536		)	—			—			(314,536		)
Net third party redeemable noncontrolling interest share transactions	—			—			(144,096		)	(144,096		)
Net cash used in financing activities	(349,277		)	—			(144,096		)	(493,373		)
Effect of exchange rate changes on foreign currency cash	—			—			(2,676		)	(2,676		)
Net decrease in cash and cash equivalents	(5,602		)	(816		)	(107,157		)	(113,575		)
Cash and cash equivalents, beginning of period	8,796			4,027			395,209			408,032
Cash and cash equivalents, end of period	$	3,194		$	3,211		$	288,052		$	294,457
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
Condensed Consolidating Statement of Cash Flows	RenaissanceRe			RenRe North			Other			RenaissanceRe
for the six months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$	(42,805	)	$	(20,926	)	$	241,150		$	177,419
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	409,514			64,535			3,974,400			4,448,449
Purchases of fixed maturity investments trading	(20,604		)	(43,799		)	(4,160,785		)	(4,225,188		)
Proceeds from sales and maturities of fixed maturity investments available for sale	—			—			41,338			41,338
Net purchases of equity investments trading	—			—			(35,958		)	(35,958		)
Net sales (purchases) of short term investments	98,000			10,396			(218,958		)	(110,562		)
Net sales of other investments	—			—			42,935			42,935
Net purchases of investments in other ventures	—			—			(2,500		)	(2,500		)
Net sales of other assets	—			—			598			598
Dividends and return of capital from subsidiaries	128,922			4,806			(133,728		)	—
Contributions to subsidiaries	(296,179		)	(12,625		)	308,804			—
Due to (from) subsidiaries	(11,753		)	339			11,414			—
Net cash provided by (used in) investing activities	307,900			23,652			(172,440		)	159,112
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(24,658		)	—			—			(24,658		)
Dividends paid – preference shares	(13,758		)	—			—			(13,758		)
RenaissanceRe common share repurchases	(121,996		)	—			—			(121,996		)
Net repayment of debt	(100,000		)	—			(1,410		)	(101,410		)
Redemption 6.08% Series C preference shares	(125,000		)	—			—			(125,000		)
Redemption 6.60% Series D preference shares	(150,000		)	—			—			(150,000		)
Issuance of 5.375% Series E preference shares, net of expenses	265,655			—			—			265,655
Net third party redeemable noncontrolling interest share transactions	—			—			(105,633		)	(105,633		)
Net cash used in financing activities	(269,757		)	—			(107,043		)	(376,800		)
Effect of exchange rate changes on foreign currency cash	—			—			505			505
Net (decrease) increase in cash and cash equivalents	(4,662		)	2,726			(37,828		)	(39,764		)
Net increase in cash and cash equivalents of discontinued operations	—			—			(29,475		)	(29,475		)
Cash and cash equivalents, beginning of period	6,298			1,528			296,319			304,145
Cash and cash equivalents, end of period	$	1,636		$	4,254		$	229,016		$	234,906
(1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	SUBSEQUENT EVENTS
	Effective July 1, 2014, the Company sold a portion of its shares of DaVinciRe to an existing third party shareholder. The Company sold these shares for $38.9 million. The Company's ownership in DaVinciRe was 26.5% at June 30, 2014 and subsequent to the above transaction, its ownership interest in DaVinciRe decreased to 23.4% effective July 1, 2014.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	BASIS OF PRESENTATION
	The consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, these unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position and results of operations as at the end of and for the periods presented. All significant intercompany accounts and transactions have been eliminated from these statements. Except as discussed in “Note 3. Discontinued Operations,” and unless otherwise noted, the notes to the consolidated financial statements reflect the Company’s continuing operations.
	Certain comparative information has been reclassified to conform to the current presentation. Because of the seasonality of the Company’s business, the results of operations and cash flows for any interim period will not necessarily be indicative of the results of operations and cash flows for the full fiscal year or subsequent quarters.
Use of Estimates in Financial Statements	'
	USE OF ESTIMATES IN FINANCIAL STATEMENTS
	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the reserve for claims and claim expenses; reinsurance recoverables, including allowances for reinsurance recoverables deemed uncollectible; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges and the Company’s deferred tax valuation allowance.
Discontinued Operations	'
	DISCONTINUED OPERATIONS
	The results of operations of REAL, which has been sold to an unaffiliated third party, is classified as held for sale and reported as discontinued operations in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic Discontinued Operations. The consolidated financial statements and notes thereto are presented excluding the operations and cash flows of the discontinued operations from the continuing operations of the Company since the Company will not have any significant continuing involvement in the operations after the sale. The financial position and results of operations of discontinued operations are presented as single line items on the consolidated balance sheets and statements of operations, respectively. Certain prior year comparatives have been reclassified to conform to the current year presentation.
Recently Issued Accounting Pronouncements Not Yet Adopted	'
	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The objective of ASU 2013-11 is to improve the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 seeks to reduce the diversity in practice by providing guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 became effective for annual and interim reporting periods beginning after December 15, 2013. The Company prospectively adopted ASU 2013-11 effective January 1, 2014 and the adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position.
	Financial Services - Investment Companies (Topic 946) Amendments to the Scope, Measurement, and Disclosure Requirements
	In June 2013, the FASB issued ASU No. 2013-08, Amendments to the Scope, Measurement, and Disclosure Requirements (“ASU 2013-08”). The objective of ASU 2013-08 is to change the approach to the investment company assessment, clarify the characteristics of an investment company and provide comprehensive guidance for assessing whether an entity is an investment company. In addition, ASU 2013-08 will require an investment company to measure noncontrolling ownership interests in other investment companies at fair value rather than using the equity method of accounting and require the following additional disclosures: (a) the fact that the entity is an investment company and is applying the guidance, (b) information about changes, if any, in an entity’s status as an investment company, and (c) information about financial support provided or contractually required to be provided by an investment company to any of its investees. ASU 2013-08 became effective for annual and interim reporting periods beginning after December 15, 2013. The Company prospectively adopted ASU 2013-08 effective January 1, 2014 and the adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position.
	RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED
	Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity (“ASU 2014-08”). The objective of ASU 2014-08 is to improve the definition of discontinued operations by limiting discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results. ASU 2014-08 will also require expanded disclosures for discontinued operations and require an entity to disclose the pretax profit or loss of an individually significant component of an entity that does not qualify for discontinued operations reporting. ASU 2014-08 is prospectively effective for public business entities in annual periods beginning on or after December 15, 2014, and interim periods beginning on or after December 15, 2015. Entities may early adopt ASU 2014-08 for new disposals that have not been reported in the consolidated financial statements previously issued or available for issuance. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	'
	Details of the income from discontinued operations for the three and six months ended June 30, 2014 and 2013 are as follows and relate entirely to REAL:
			Three months ended June 30,					Six months ended June 30,
			2014		2013			2014		2013
		Revenues
		Net investment income	$	—	$	1,161		$	—	$	1,153
		Net foreign exchange (losses) gains	—		(153		)	—		989
		Other income	—		1,759			—		10,472
		Net realized and unrealized losses on investments	—		(15		)	—		(13		)
		Total revenues	—		2,752			—		12,601
		Expenses
		Operational expenses	—		31			—		59
		Corporate expenses	—		59			—		106
		Total expenses	—		90			—		165
		Income before taxes	—		2,662			—		12,436
		Income tax expense	—		(236		)	—		(236		)
		Income from discontinued operations	$	—	$	2,426		$	—	$	12,200

Investments_Tables

Investments (Tables)	6 Months Ended
	Jun. 30, 2014
Investments [Abstract]	'
Schedule of Fair Value of Fixed Maturity Investments Trading	'
	The following table summarizes the fair value of fixed maturity investments trading:
			June 30,			December 31,
			2014			2013
		U.S. treasuries	$	1,706,929		$	1,352,413
		Agencies	121,650			186,050
		Non-U.S. government (Sovereign debt)	271,495			334,580
		Non-U.S. government-backed corporate	163,911			237,479
		Corporate	1,580,038			1,803,415
		Agency mortgage-backed	321,629			336,661
		Non-agency mortgage-backed	252,530			243,795
		Commercial mortgage-backed	392,085			303,214
		Asset-backed	31,342			11,429
		Total fixed maturity investments trading	$	4,841,609		$	4,809,036
Schedule of Fair Value of Fixed Maturity Investments Available For Sale	'
	The following table summarizes the amortized cost, fair value and related unrealized gains and losses and non-credit other-than-temporary impairments of fixed maturity investments available for sale:
						Included in Accumulated
						Other Comprehensive Income
		30-Jun-14	Amortized			Gross			Gross			Fair Value			Non-Credit
			Cost			Unrealized Gains			Unrealized Losses						Other-Than-
															Temporary
															Impairments
															(1)
		Agency mortgage-backed	$	4,279		$	396		$	—		$	4,675		$	—
		Non-agency mortgage-backed	10,509			2,304			(3		)	12,810			(698		)
		Commercial mortgage-backed	7,373			830			—			8,203			—
		Asset-backed	3,351			180			—			3,531			—
		Total fixed maturity investments available for sale	$	25,512		$	3,710		$	(3	)	$	29,219		$	(698	)
						Included in Accumulated
						Other Comprehensive Income
		31-Dec-13	Amortized Cost			Gross			Gross			Fair Value			Non-Credit
						Unrealized Gains			Unrealized Losses						Other-Than-
															Temporary
															Impairments
															(1)
		Agency mortgage-backed	$	4,880		$	378		$	(11	)	$	5,247		$	—
		Non-agency mortgage-backed	11,735			2,414			(6		)	14,143			(742		)
		Commercial mortgage-backed	10,052			970			—			11,022			—
		Asset-backed	3,606			223			—			3,829			—
		Total fixed maturity investments available for sale	$	30,273		$	3,985		$	(17	)	$	34,241		$	(742	)
	-1	Represents the non-credit component of other-than-temporary impairments recognized in accumulated other comprehensive income adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.
Schedule of Contractual Maturities of Fixed Maturity Investments	'
	Contractual maturities of fixed maturity investments are as follows. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
			Trading						Available for Sale						Total Fixed Maturity Investments
		30-Jun-14	Amortized			Fair Value			Amortized Cost			Fair Value			Amortized Cost			Fair Value
			Cost
		Due in less than one year	$	100,250		$	100,765		$	—		$	—		$	100,250		$	100,765
		Due after one through five years	3,057,740			3,080,879			—			—			3,057,740			3,080,879
		Due after five through ten years	520,699			529,811			—			—			520,699			529,811
		Due after ten years	102,944			132,568			—			—			102,944			132,568
		Mortgage-backed	943,257			966,244			22,161			25,688			965,418			991,932
		Asset-backed	29,590			31,342			3,351			3,531			32,941			34,873
		Total	$	4,754,480		$	4,841,609		$	25,512		$	29,219		$	4,779,992		$	4,870,828
Schedule of Fair Value of Equity Investments Trading	'
	The following table summarizes the fair value of equity investments trading:
			June 30,			December 31,
			2014			2013
		Financials	$	153,099		$	152,905
		Industrial, utilities and energy	32,127			25,350
		Communications and technology	31,245			4,300
		Consumer	18,302			44,115
		Healthcare	15,609			15,340
		Basic materials	4,026			12,766
		Total	$	254,408		$	254,776
Schedule of Net Investment Income	'
	The components of net investment income are as follows:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Fixed maturity investments	$	26,372		$	22,839		$	50,232		$	46,725
		Short term investments	286			426			476			755
		Equity investments	779			344			1,575			344
		Other investments
		Hedge funds and private equity investments	8,340			2,237			20,657			17,117
		Other	1,483			3,144			6,011			10,139
		Cash and cash equivalents	93			9			184			61
			37,353			28,999			79,135			75,141
		Investment expenses	(2,812		)	(2,836		)	(5,646		)	(5,776		)
		Net investment income	$	34,541		$	26,163		$	73,489		$	69,365
Schedule of Net Realized and Unrealized Gains On Investments and Net Other-Than-Temporary Impairments	'
	The following table provides an analysis of the components of net realized and unrealized gains on investments.
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Gross realized gains	$	12,166		$	17,548		$	25,633		$	51,624
		Gross realized losses	(2,587		)	(14,601		)	(8,151		)	(19,155		)
		Net realized gains on fixed maturity investments	9,579			2,947			17,482			32,469
		Net unrealized gains (losses) on fixed maturity investments trading	29,918			(95,680		)	57,800			(118,743		)
		Net realized and unrealized (losses) gains on investments-related derivatives	(6,884		)	20,510			(17,783		)	20,931
		Net realized gains on equity investments trading	5,134			74			5,055			17,635
		Net unrealized (losses) gains on equity investments trading	(10,619		)	2,620			(20,499		)	(7,552		)
		Net realized and unrealized gains on investments	$	27,128		$	(69,529	)	$	42,055		$	(55,260	)
Schedule of Components of Other Comprehensive Income and Reclassification Out of Accumulated Other Comprehensive Income	'
	The following tables provide an analysis of the components of other comprehensive income and reclassifications out of accumulated other comprehensive income.
			Three months ended June 30, 2014
			Investments in other ventures			Fixed maturity investments available for sale			Total
		Beginning balance	$	160		$	3,803		$	3,963
		Other comprehensive income (loss) before reclassifications	51			(96		)	(45		)
		Ending balance	$	211		$	3,707		$	3,918
			Six months ended June 30, 2014
			Investments in other ventures			Fixed maturity investments available for sale			Total
		Beginning balance	$	163		$	3,968		$	4,131
		Other comprehensive income (loss) before reclassifications	48			(261		)	(213		)
		Ending balance	$	211		$	3,707		$	3,918
			Three months ended June 30, 2013
			Investments in other ventures			Fixed maturity investments available for sale			Total
		Beginning balance	$	120		$	5,930		$	6,050
		Other comprehensive income before reclassifications	98			80			178
		Amounts reclassified from accumulated other comprehensive income by statement of operations line item:
		Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	—			(1,319		)	(1,319		)
		Net current-period other comprehensive loss	98			(1,239		)	(1,141		)
		Ending balance	$	218		$	4,691		$	4,909
			Six months ended June 30, 2013
			Investments in other ventures			Fixed maturity investments available for sale			Total
		Beginning balance	$	1,625		$	11,997		$	13,622
		Other comprehensive loss before reclassifications	(1,407		)	(126		)	(1,533		)
		Amounts reclassified from accumulated other comprehensive income by statement of operations line item:
		Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	—			(7,180		)	(7,180		)
		Net current-period other comprehensive loss	(1,407		)	(7,306		)	(8,713		)
		Ending balance	$	218		$	4,691		$	4,909
Schedule of Fixed Maturity Investments Available For Sale In Continual Unrealized Loss Position	'
	The following tables provide an analysis of the length of time the Company’s fixed maturity investments available for sale in an unrealized loss have been in a continual unrealized loss position.
			Less than 12 Months						12 Months or Greater						Total
		At June 30, 2014	Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
						Losses						Losses						Losses
		Non-agency mortgage-backed	$	—		$	—		$	76		$	(3	)	$	76		$	(3	)
		Total	$	—		$	—		$	76		$	(3	)	$	76		$	(3	)
			Less than 12 Months						12 Months or Greater						Total
		31-Dec-13	Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
						Losses						Losses						Losses
		Agency mortgage-backed	$	726		$	(11	)	$	—		$	—		$	726		$	(11	)
		Non-agency mortgage-backed	—			—			89			(6		)	89			(6		)
		Commercial mortgage-backed	39			—			—			—			39			—
		Total	$	765		$	(11	)	$	89		$	(6	)	$	854		$	(17	)
Rollforward of the Amount of Other-Than-Temporary Impairments Related To Credit Losses Recognized in Earnings For Which A Portion Of An Other-Than-Temporary Impairment Was Recognized In Accumulated Other Comprehensive Income	'
	The following table provides a rollforward of the amount of other-than-temporary impairments related to credit losses recognized in earnings for which a portion of an other-than-temporary impairment was recognized in accumulated other comprehensive income:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	545		$	811		$	561		$	838
		Reductions:
		Securities sold during the period	(16		)	(20		)	(32		)	(47		)
		Ending balance	$	529		$	791		$	529		$	791

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	'
	Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets:
		At June 30, 2014	Total			Quoted			Significant				Significant
						Prices in Active			Other				Unobservable
						Markets for			Observable				Inputs
						Identical			Inputs				(Level 3)
						Assets			(Level 2)
						(Level 1)
		Fixed maturity investments
		U.S. treasuries	$	1,706,929		$	1,706,929		$	—			$	—
		Agencies	121,650			—			121,650				—
		Non-U.S. government (Sovereign debt)	271,495			—			271,495				—
		Non-U.S. government-backed corporate	163,911			—			163,911				—
		Corporate	1,580,038			—			1,533,862				46,176
		Agency mortgage-backed	326,304			—			326,304				—
		Non-agency mortgage-backed	265,340			—			265,340				—
		Commercial mortgage-backed	400,288			—			400,288				—
		Asset-backed	34,873			—			34,873				—
		Total fixed maturity investments	4,870,828			1,706,929			3,117,723				46,176
		Short term investments	957,698			—			957,698				—
		Equity investments trading	254,408			254,408			—				—
		Other investments
		Private equity partnerships	314,983			—			—				314,983
		Catastrophe bonds	179,465			—			179,465				—
		Senior secured bank loan funds	15,976			—			—				15,976
		Hedge funds	3,190			—			—				3,190
		Total other investments	513,614			—			179,465				334,149
		Other assets and (liabilities)
		Derivatives (1)	6,491			(340		)	5,760				1,071
		Other	(5,214		)	—			(5,214		)		—
		Total other assets and (liabilities)	1,277			(340		)	546				1,071
			$	6,597,825		$	1,960,997		$	4,255,432			$	381,396
	(1) See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
		December 31, 2013	Total			Quoted			Significant				Significant
						Prices in Active			Other				Unobservable
						Markets for			Observable				Inputs
						Identical			Inputs				(Level 3)
						Assets			(Level 2)
						(Level 1)
		Fixed maturity investments
		U.S. treasuries	$	1,352,413		$	1,352,413		$	—			$	—
		Agencies	186,050			—			186,050				—
		Non-U.S. government (Sovereign debt)	334,580			—			334,580				—
		Non-U.S. government-backed corporate	237,479			—			237,479				—
		Corporate	1,803,415			—			1,775,835				27,580
		Agency mortgage-backed	341,908			—			341,908				—
		Non-agency mortgage-backed	257,938			—			257,938				—
		Commercial mortgage-backed	314,236			—			314,236				—
		Asset-backed	15,258			—			15,258				—
		Total fixed maturity investments	4,843,277			1,352,413			3,463,284				27,580
		Short term investments	1,044,779			—			1,044,779				—
		Equity investments trading	254,776			254,776			—				—
		Other investments
		Private equity partnerships	322,391			—			—				322,391
		Catastrophe bonds	229,016			—			229,016				—
		Senior secured bank loan funds	18,048			—			—				18,048
		Hedge funds	3,809			—			—				3,809
		Total other investments	573,264			—			229,016				344,248
		Other assets and (liabilities)
		Derivatives (1)	4,758			823			6,425				(2,490		)
		Other	(12,991		)	—			(12,991		)		—
		Total other assets and (liabilities)	(8,233		)	823			(6,566		)		(2,490		)
			$	6,707,863		$	1,608,012		$	4,730,513			$	369,338
	(1) See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
Schedule Of Quantitative Information Used As Level 3 Inputs	'
	Below is a summary of quantitative information regarding the significant observable and unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis:
		At June 30, 2014	Fair Value			Valuation Technique		Unobservable (U)	Low			High			Weighted Average or Actual
			(Level 3)					and Observable (O)
								Inputs
		Fixed maturity investments
		Corporate	$	15,938		Discounted cash flow (“DCF”)		Credit spread (U)	n/a			n/a			1.1	%
								Liquidity discount (U)	n/a			n/a			1	%
								Risk-free rate (O)	n/a			n/a			0.3	%
								Dividend rate (O)	n/a			n/a			6.2	%
		Corporate	30,238			Internal valuation model		Private transaction (U)	n/a			n/a			See below
		Total fixed maturity investments	46,176
		Other investments
		Private equity partnerships	314,983			Net asset valuation		Estimated performance (U)	(3.0	)%		18.9	%		4	%
		Senior secured bank loan funds	15,976			Net asset valuation		Estimated performance (U)	n/a			n/a			0.7	%
		Hedge funds	3,190			Net asset valuation		Estimated performance (U)	0	%		0	%		0	%
		Total other investments	334,149
		Other assets and (liabilities)
		Weather contract	(1,149		)	Internal valuation model		See below	n/a			n/a			See below
		Call rights	2,220			Internal valuation model		See below	n/a			n/a			See below
		Total other assets and (liabilities)	1,071
			$	381,396
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs	'
	Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation.
			Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Fixed maturity			Other			Other assets				Total
			investments			investments			and
			trading						(liabilities)
		Balance - April 1, 2014	$	37,138		$	342,778		$	(1,307	)		$	378,609
		Total unrealized gains (losses)
		Included in net investment income	9,038			1,579			179				10,796
		Included in other loss	—			—			2,220				2,220
		Total foreign exchange gains	—			(205		)	(21		)		(226		)
		Purchases	—			10,391			—				10,391
		Settlements	—			(20,394		)	—				(20,394		)
		Balance - June 30, 2014	$	46,176		$	334,149		$	1,071			$	381,396
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	9,038		$	1,579		$	179			$	10,796
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in other loss	$	—		$	—		$	2,220			$	2,220
			Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Fixed maturity			Other			Other assets				Total
			investments			investments			and
			trading						(liabilities)
		Balance - January 1, 2014	$	27,580		$	344,248		$	(2,490	)		$	369,338
		Total unrealized gains (losses)
		Included in net investment income	18,596			9,455			1,395				29,446
		Included in other loss	—			—			2,220				2,220
		Total foreign exchange gains	—			(199		)	(54		)		(253		)
		Purchases	—			25,392			—				25,392
		Settlements	—			(44,747		)	—				(44,747		)
		Balance - June 30, 2014	$	46,176		$	334,149		$	1,071			$	381,396
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	18,596		$	9,455		$	1,395			$	29,446
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in other loss	$	—		$	—		$	2,220			$	2,220
			Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Fixed maturity			Other			Other assets  and (liabilities)				Total
			investments			investments
			trading
		Balance - April 1, 2013	$	28,067		$	402,206		$	1,301			$	431,574
		Total unrealized gains (losses)
		Included in net investment income	114			(2,373		)	—				(2,259		)
		Total realized losses
		Included in other income (loss)	—			—			(676		)		(676		)
		Total foreign exchange gains	—			364			—				364
		Purchases	—			18,411			—				18,411
		Sales	—			424			—				424
		Settlements	(2,500		)	(25,328		)	—				(27,828		)
		Balance - June 30, 2013	$	25,681		$	393,704		$	625			$	420,010
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	114		$	(2,373	)	$	—			$	(2,259	)
			Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Fixed maturity			Other			Other assets  and (liabilities)				Total
			investments			investments
			trading
		Balance - January 1, 2013	$	27,792		$	381,067		$	21,513			$	430,372
		Total unrealized gains (losses)
		Included in net investment income	389			10,643			—				11,032
		Total realized losses
		Included in other income (loss)	—			—			(2,646		)		(2,646		)
		Total foreign exchange gains	—			(417		)	—				(417		)
		Purchases	—			29,196			—				29,196
		Settlements	(2,500		)	(45,027		)	—				(47,527		)
		Reclassified from other assets to other investments	—			18,242			(18,242		)		—
		Balance - June 30, 2013	$	25,681		$	393,704		$	625			$	420,010
		Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income	$	389		$	10,643		$	—			$	11,032
Schedule Of The Balances The Company Has Elected To Account For At Fair Value	'
	Below is a summary of the balances the Company has elected to account for at fair value:
			June 30,			December 31,
			2014			2013
		Other investments	$	513,614		$	573,264
Schedule Of Other Investments Measured Using Net Asset Valuations	'
	The table below shows the Company’s portfolio of other investments measured using net asset valuations:
		At June 30, 2014	Fair Value			Unfunded			Redemption Frequency		Redemption		Redemption
						Commitments					Notice Period (Minimum Days)		Notice Period (Maximum Days)
		Private equity partnerships	$	314,983		$	84,529		See below		See below		See below
		Senior secured bank loan funds	15,976			9,272			See below		See below		See below
		Hedge funds	3,190			—			See below		See below		See below
		Total other investments measured using net asset valuations	$	334,149		$	93,801

Reinsurance_Tables

Reinsurance (Tables)	6 Months Ended
	Jun. 30, 2014
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]	'
Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses Incurred	'
	The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Premiums written
		Direct	$	19,707		$	16,333		$	33,562		$	26,650
		Assumed	491,833			686,890			1,183,238			1,311,991
		Ceded	(165,133		)	(144,114		)	(420,046		)	(342,719		)
		Net premiums written	$	346,407		$	559,109		$	796,754		$	995,922
		Premiums earned
		Direct	$	14,949		$	10,789		$	29,178		$	20,662
		Assumed	350,389			380,626			735,987			747,479
		Ceded	(104,922		)	(99,526		)	(218,215		)	(204,997		)
		Net premiums earned	$	260,416		$	291,889		$	546,950		$	563,144
		Claims and claim expenses
		Gross claims and claim expenses incurred	$	97,064		$	116,995		$	165,214		$	150,993
		Claims and claim expenses recovered	(15,676		)	(13,033		)	(24,911		)	(19,780		)
		Net claims and claim expenses incurred	$	81,388		$	103,962		$	140,303		$	131,213

Noncontrolling_Interests_Table

Noncontrolling Interests (Tables)	6 Months Ended
	Jun. 30, 2014
Noncontrolling Interest [Line Items]	'
Schedule of Activity in Noncontrolling Interest	'
	A summary of the Company’s noncontrolling interests on its consolidated balance sheets is set forth below:
			June 30,			December 31, 2013
			2014
		Redeemable noncontrolling interest - DaVinciRe	$	930,231		$	1,063,368
		Redeemable noncontrolling interest - Medici	93,661			36,492
		Redeemable noncontrolling interest	$	1,023,892		$	1,099,860
	A summary of the Company’s noncontrolling interests on its consolidated statements of operations set forth below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Redeemable noncontrolling interest - DaVinciRe	$	35,706		$	14,009		$	76,886		$	52,824
		Redeemable noncontrolling interest - Medici	372			7			1,960			7
		Noncontrolling interest - Angus Fund	—			(1		)	—			(209		)
		Net income attributable to noncontrolling interests	$	36,078		$	14,015		$	78,846		$	52,622
Schedule Of Redeemable Noncontrolling Interest	'
	The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	895,391		$	875,770		$	1,063,368		$	968,259
		Redemption of shares from redeemable noncontrolling interest	(866		)	(663		)	(219,745		)	(186,894		)
		Sale of shares to redeemable noncontrolling interests	—			—			9,722			54,927
		Net income attributable to redeemable noncontrolling interest	35,706			14,009			76,886			52,824
		Ending balance	$	930,231		$	889,116		$	930,231		$	889,116
Medici	'
Noncontrolling Interest [Line Items]	'
Schedule Of Noncontrolling Interest	'
	The activity in redeemable noncontrolling interest – Medici is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	91,590		$	—		$	36,492		$	—
		Redemption of shares from redeemable noncontrolling interest	—			—			(1,875		)	—
		Sale of shares to redeemable noncontrolling interests	1,699			8,000			57,084			8,000
		Net income attributable to redeemable noncontrolling interest	372			7			1,960			7
		Ending balance	$	93,661		$	8,007		$	93,661		$	8,007
Angus Fund	'
Noncontrolling Interest [Line Items]	'
Schedule Of Noncontrolling Interest	'
	The activity in noncontrolling interest – Angus Fund is detailed in the table below:
			Three months ended June 30,						Six months ended June 30,
			2014			2013			2014			2013
		Beginning balance	$	—		$	3,747		$	—		$	3,991
		Adjustment of ownership interest	—			—			—			139
		Net loss attributable to noncontrolling interest	—			(1		)	—			(209		)
		Dividends on common shares	—			(53		)	—			(228		)
		Ending balance	$	—		$	3,693		$	—		$	3,693

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share	'
	The following table sets forth the computation of basic and diluted earnings per common share:
			Three months ended June 30,						Six months ended June 30,
		(thousands of shares)	2014			2013			2014			2013
		Numerator:
		Net income available to RenaissanceRe common shareholders	$	120,752		$	26,806		$	271,755		$	217,280
		Amount allocated to participating common shareholders (1)	(1,557		)	(376		)	(3,577		)	(3,174		)
		Net income allocated to RenaissanceRe common shareholders	$	119,195		$	26,430		$	268,178		$	214,106
		Denominator:
		Denominator for basic income per RenaissanceRe common share - weighted average common shares	39,736			43,372			40,487			43,453
		Per common share equivalents of employee stock options and restricted shares	659			871			662			850
		Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	40,395			44,243			41,149			44,303
		Net income available to RenaissanceRe common shareholders per common share – basic	$	3		$	0.61		$	6.62		$	4.93
		Net income available to RenaissanceRe common shareholders per common share – diluted	$	2.95		$	0.6		$	6.52		$	4.83
	-1	Represents earnings attributable to holders of unvested restricted shares issued under the Company’s 2001 Stock Incentive Plan and Non-Employee Director Stock Incentive Plan.

Segment_Reporting_Tables

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2014
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 is as follows:
		Three months ended June 30, 2014	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written	$	388,083		$	51,554		$	71,903		$	—		$	511,540
		Net premiums written	$	233,698		$	46,254		$	66,452		$	3		$	346,407
		Net premiums earned	$	159,152		$	53,588		$	47,672		$	4		$	260,416
		Net claims and claim expenses incurred	36,730			20,075			25,111			(528		)	81,388
		Acquisition expenses	17,806			11,699			10,122			(6,150		)	33,477
		Operational expenses	22,200			10,514			13,058			69			45,841
		Underwriting income (loss)	$	82,416		$	11,300		$	(619	)	$	6,613		99,710
		Net investment income										34,541			34,541
		Net foreign exchange gains										2,392			2,392
		Equity in earnings of other ventures										7,232			7,232
		Other loss										(535		)	(535		)
		Net realized and unrealized gains on investments										27,128			27,128
		Corporate expenses										(3,954		)	(3,954		)
		Interest expense										(4,292		)	(4,292		)
		Income before taxes and noncontrolling interests													162,222
		Income tax benefit										204			204
		Net income attributable to noncontrolling interests										(36,078		)	(36,078		)
		Dividends on preference shares										(5,596		)	(5,596		)
		Net income available to RenaissanceRe common shareholders													$	120,752
		Net claims and claim expenses incurred – current accident year	$	38,473		$	25,443		$	34,555		$	—		$	98,471
		Net claims and claim expenses incurred – prior accident years	(1,743		)	(5,368		)	(9,444		)	(528		)	(17,083		)
		Net claims and claim expenses incurred – total	$	36,730		$	20,075		$	25,111		$	(528	)	$	81,388
		Net claims and claim expense ratio – current accident year	24.2		%	47.5		%	72.5		%	—		%	37.8		%
		Net claims and claim expense ratio – prior accident years	(1.1		)%	(10.0		)%	(19.8		)%	(13,200.0		)%	(6.5		)%
		Net claims and claim expense ratio – calendar year	23.1		%	37.5		%	52.7		%	(13,200.0		)%	31.3		%
		Underwriting expense ratio	25.1		%	41.4		%	48.6		%	(152,025.0		)%	30.4		%
		Combined ratio	48.2		%	78.9		%	101.3		%	(165,225.0		)%	61.7		%
		Six months ended June 30, 2014	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written	$	855,794		$	205,844		$	155,162		$	—		$	1,216,800
		Net premiums written	$	493,187		$	171,743		$	131,821		$	3		$	796,754
		Net premiums earned	$	323,736		$	123,218		$	99,969		$	27		$	546,950
		Net claims and claim expenses incurred	43,185			46,156			51,392			(430		)	140,303
		Acquisition expenses	24,932			28,246			20,689			(6,690		)	67,177
		Operational expenses	42,619			20,620			25,091			135			88,465
		Underwriting income	$	213,000		$	28,196		$	2,797		$	7,012		251,005
		Net investment income										73,489			73,489
		Net foreign exchange gains										1,331			1,331
		Equity in earnings of other ventures										11,431			11,431
		Other loss										(473		)	(473		)
		Net realized and unrealized gains on investments										42,055			42,055
		Corporate expenses										(8,499		)	(8,499		)
		Interest expense										(8,585		)	(8,585		)
		Income before taxes and noncontrolling interests													361,754
		Income tax benefit										38			38
		Net income attributable to noncontrolling interests										(78,846		)	(78,846		)
		Dividends on preference shares										(11,191		)	(11,191		)
		Net income available to RenaissanceRe common shareholders													$	271,755
		Net claims and claim expenses incurred – current accident year	$	51,002		$	67,365		$	55,712		$	—		$	174,079
		Net claims and claim expenses incurred – prior accident years	(7,817		)	(21,209		)	(4,320		)	(430		)	(33,776		)
		Net claims and claim expenses incurred – total	$	43,185		$	46,156		$	51,392		$	(430	)	$	140,303
		Net claims and claim expense ratio – current accident year	15.8		%	54.7		%	55.7		%	—		%	31.8		%
		Net claims and claim expense ratio – prior accident years	(2.5		)%	(17.2		)%	(4.3		)%	(1,592.6		)%	(6.1		)%
		Net claims and claim expense ratio – calendar year	13.3		%	37.5		%	51.4		%	(1,592.6		)%	25.7		%
		Underwriting expense ratio	20.9		%	39.6		%	45.8		%	(24,277.8		)%	28.4		%
		Combined ratio	34.2		%	77.1		%	97.2		%	(25,870.4		)%	54.1		%
		Three months ended June 30, 2013	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
		Gross premiums written (1)	$	576,903		$	58,539		$	68,769		$	(988	)	$	703,223
		Net premiums written	$	436,852		$	57,348		$	64,643		$	266		$	559,109
		Net premiums earned	$	200,483		$	49,206		$	41,933		$	267		$	291,889
		Net claims and claim expenses incurred	52,915			25,511			25,536			—			103,962
		Acquisition expenses	14,197			9,009			8,484			77			31,767
	Operational expenses	23,599			7,595			11,456			139			42,789
	Underwriting income (loss)	$	109,772		$	7,091		$	(3,543	)	$	51		113,371
	Net investment income										26,163			26,163
	Net foreign exchange losses										(932		)	(932		)
	Equity in earnings of other ventures										3,772			3,772
	Other loss										(1,128		)	(1,128		)
	Net realized and unrealized losses on investments										(69,529		)	(69,529		)
	Corporate expenses										(21,529		)	(21,529		)
	Interest expense										(4,300		)	(4,300		)
	Income from continuing operations before taxes													45,888
	Income tax expense										(11		)	(11		)
	Income from discontinued operations										2,427			2,427
	Net income attributable to noncontrolling interests										(14,015		)	(14,015		)
	Dividends on preference shares										(7,483		)	(7,483		)
	Net income attributable to RenaissanceRe common shareholders													$	26,806
	Net claims and claim expenses incurred – current accident year	$	71,369		$	30,903		$	28,517		$	—		$	130,789
	Net claims and claim expenses incurred – prior accident years	(18,454		)	(5,392		)	(2,981		)	—			(26,827		)
	Net claims and claim expenses incurred – total	$	52,915		$	25,511		$	25,536		$	—		$	103,962
	Net claims and claim expense ratio – current accident year	35.6		%	62.8		%	68		%	—		%	44.8		%
	Net claims and claim expense ratio – prior accident years	(9.2		)%	(11.0		)%	(7.1		)%	—		%	(9.2		)%
	Net claims and claim expense ratio – calendar year	26.4		%	51.8		%	60.9		%	—		%	35.6		%
	Underwriting expense ratio	18.8		%	33.8		%	47.5		%	80.9		%	25.6		%
	Combined ratio	45.2		%	85.6		%	108.4		%	80.9		%	61.2		%
(1) Included in gross premiums written in the Other category is the elimination of inter-segment gross premiums written of $1.0 million.
	Six months ended June 30, 2013	Catastrophe Reinsurance			Specialty Reinsurance			Lloyd’s			Other			Total
	Gross premiums written (1)	$	1,055,699		$	140,869		$	143,061		$	(988	)	$	1,338,641
	Net premiums written	$	742,205		$	132,867		$	120,567		$	283		$	995,922
	Net premiums earned	$	387,134		$	96,015		$	79,712		$	283		$	563,144
	Net claims and claim expenses incurred	55,623			36,203			40,064			(677		)	131,213
	Acquisition expenses	23,817			17,448			15,400			111			56,776
	Operational expenses	49,714			15,155			23,634			272			88,775
	Underwriting income	$	257,980		$	27,209		$	614		$	577		286,380
	Net investment income										69,365			69,365
	Net foreign exchange losses										(318		)	(318		)
	Equity in earnings of other ventures										9,607			9,607
	Other loss										(2,837		)	(2,837		)
	Net realized and unrealized losses on investments										(55,260		)	(55,260		)
	Corporate expenses										(26,011		)	(26,011		)
	Interest expense										(9,334		)	(9,334		)
	Income from continuing operations before taxes													271,592
	Income tax expense										(133		)	(133		)
	Income from discontinued operations										12,201			12,201
	Net income attributable to noncontrolling interests										(52,622		)	(52,622		)
	Dividends on preference shares										(13,758		)	(13,758		)
	Net income attributable to RenaissanceRe common shareholders													$	217,280
	Net claims and claim expenses incurred – current accident year	$	92,545		$	56,756		$	46,388		$	—		$	195,689
	Net claims and claim expenses incurred – prior accident years	(36,922		)	(20,553		)	(6,324		)	(677		)	(64,476		)
	Net claims and claim expenses incurred – total	$	55,623		$	36,203		$	40,064		$	(677	)	$	131,213
	Net claims and claim expense ratio – current accident year	23.9		%	59.1		%	58.2		%	—		%	34.7		%
	Net claims and claim expense ratio – prior accident years	(9.5		)%	(21.4		)%	(7.9		)%	(239.2		)%	(11.4		)%
	Net claims and claim expense ratio – calendar year	14.4		%	37.7		%	50.3		%	(239.2		)%	23.3		%
	Underwriting expense ratio	19		%	34		%	48.9		%	135.3		%	25.9		%
	Combined ratio	33.4		%	71.7		%	99.2		%	(103.9		)%	49.2		%
(1) Included in gross premiums written in the Other category is the elimination of inter-segment gross premiums written of $1.0 million.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Summary of Derivative Instruments [Abstract]	'
Schedule of Location on Consolidated Balance Sheets and Fair Value Of Principal Derivative Instruments	'
	The tables below show the gross and net amounts of recognized derivative assets and liabilities, including the location on the consolidated balance sheets and fair value of the Company’s principal derivative instruments:
			Derivative Assets
		At June 30, 2014	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Balance Sheet				Net Amounts of Assets Presented in the Balance Sheet		Balance Sheet Location	Collateral		Net Amount
		Interest rate futures	$	190			189				$	1	Other assets	$	—	$	1
		Foreign currency forward contracts (1)	10,764				3,747				7,017		Other assets	—		7,017
		Foreign currency forward contracts (2)	249				238				11		Other assets	—		11
		Credit default swaps	730				33				697		Other assets	570		127
		Call rights	2,220				—				2,220		Other assets	—		2,220
		Total	$	14,153			$	4,207			$	9,946		$	570	$	9,376
			Derivative Liabilities
		At June 30, 2014	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Balance Sheet				Net Amounts of Liabilities Presented in the Balance Sheet		Balance Sheet Location	Collateral Pledged		Net Amount
		Interest rate futures	$	530			189				$	341	Other liabilities	$	331	$	10
		Foreign currency forward contracts (1)	1,042				—				1,042		Other liabilities	—		1,042
		Foreign currency forward contracts (2)	1,151				238				913		Other liabilities	—		913
		Credit default swaps	43				33				10		Other liabilities	—		10
		Weather contract	1,149				—				1,149		Other liabilities	—		1,149
		Total	$	3,915			$	460			$	3,455		$	331	$	3,124
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.
			Derivative Assets
		At December 31, 2013	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Balance Sheet				Net Amounts of Assets Presented in the Balance Sheet		Balance Sheet Location	Collateral		Net Amount
		Interest rate futures	$	897			62				$	835	Other assets	$	—	$	835
		Foreign currency forward contracts (1)	9,612				1,179				8,433		Other assets	—		8,433
		Foreign currency forward contracts (2)	1,013				338				675		Other assets	—		675
		Credit default swaps	806				82				724		Other assets	310		414
		Total	$	12,328			$	1,661			$	10,667		$	310	$	10,357
			Derivative Liabilities
		At December 31, 2013	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Balance Sheet				Net Amounts of Liabilities Presented in the Balance Sheet		Balance Sheet Location	Collateral Pledged		Net Amount
		Interest rate futures	$	74			62				$	12	Other liabilities	$	12	$	—
		Foreign currency forward contracts (1)	2,204				28				2,176		Other liabilities	—		2,176
		Foreign currency forward contracts (2)	1,557				338				1,219		Other liabilities	—		1,219
		Credit default swaps	94				82				12		Other liabilities	—		12
		Weather contract	2,490				—				2,490		Other liabilities	—		2,490
		Total	$	6,419			$	510			$	5,909		$	12	$	5,897
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.
Schedule of Gain (Loss) Recognized In Consolidated Statements Of Operations Related To Principal Derivative Instruments	'
	The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its principal derivative instruments are shown in the following table:
			Location of gain (loss)		Amount of gain (loss) recognized on
			recognized on derivatives		derivatives
		Three months ended June 30,			2014				2013
		Interest rate futures	Net realized and unrealized gains (losses) on investments		$	(7,362	)		$	20,203
		Foreign currency forward contracts (1)	Net foreign exchange gains (losses)		(1,990		)		(13,264		)
		Foreign currency forward contracts (2)	Net foreign exchange gains (losses)		58				(332		)
		Credit default swaps	Net realized and unrealized gains (losses) on investments		299				292
		Weather contract	Net realized and unrealized gains (losses) on investments		179				—
		Call rights	Other loss		2,220				—
		Total			$	(6,596	)		$	6,899
			Location of gain (loss)		Amount of gain (loss) recognized on
			recognized on derivatives		derivatives
		Six months ended June 30,			2014				2013
		Interest rate futures	Net realized and unrealized gains (losses) on investments		$	(19,636	)		$	20,205
		Foreign currency forward contracts (1)	Net foreign exchange gains (losses)		2,109				(10,876		)
		Foreign currency forward contracts (2)	Net foreign exchange gains (losses)		(1,341		)		1,346
		Credit default swaps	Net realized and unrealized gains (losses) on investments		458				726
		Weather contract	Net realized and unrealized gains (losses) on investments		1,395				—
		Call rights	Other loss		2,220				—
		Total			$	(14,795	)		$	11,401
	-1	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
	-2	Contracts used to manage foreign currency risks in investment operations.

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Tables)	6 Months Ended
	Jun. 30, 2014
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]	'
Condensed Consolidating Balance Sheets	'
	Condensed Consolidating Balance Sheet at June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
		Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Assets
	Total investments	$	168,982		$	98,580		$	6,439,340		$	—		$	6,706,902
	Cash and cash equivalents	3,194			3,211			288,052			—			294,457
	Investments in subsidiaries	3,473,208			72,077			—			(3,545,285		)	—
	Due from subsidiaries and affiliates	141,812			24			—			(141,836		)	—
	Premiums receivable	—			—			837,116			—			837,116
	Prepaid reinsurance premiums	—			—			267,963			—			267,963
	Reinsurance recoverable	—			—			85,115			—			85,115
	Accrued investment income	179			124			27,716			—			28,019
	Deferred acquisition costs	—			—			140,765			—			140,765
	Receivable for investments sold	8			4			58,193			—			58,205
	Other assets	113,130			1,362			84,049			(101,458		)	97,083
	Total assets	$	3,900,513		$	175,382		$	8,228,309		$	(3,788,579	)	$	8,515,625
	Liabilities, Noncontrolling Interests and Shareholders’ Equity
	Liabilities
	Reserve for claims and claim expenses	$	—		$	—		$	1,552,618		$	—		$	1,552,618
	Unearned premiums	—			—			929,523			—			929,523
	Debt	—			249,476			—			—			249,476
	Amounts due to subsidiaries and affiliates	53,698			2,420			—			(56,118		)	—
	Reinsurance balances payable	—			—			558,185			—			558,185
	Payable for investments purchased	—			73			201,267			—			201,340
	Other liabilities	10,874			7,495			147,739			(1,458		)	164,650
	Total liabilities	64,572			259,464			3,389,332			(57,576		)	3,655,792
	Redeemable noncontrolling interest – DaVinciRe	—			—			1,023,892			—			1,023,892
	Shareholders’ Equity
	Total shareholders’ equity	3,835,941			(84,082		)	3,815,085			(3,731,003		)	3,835,941
	Total liabilities, noncontrolling interests and shareholders’ equity	$	3,900,513		$	175,382		$	8,228,309		$	(3,788,579	)	$	8,515,625
	-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
	-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
	Condensed Consolidating Balance Sheet at December 31, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
		Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Assets
	Total investments	$	210,719		$	98,784		$	6,512,209		$	—		$	6,821,712
	Cash and cash equivalents	8,796			4,027			395,209			—			408,032
	Investments in subsidiaries	3,294,729			74,718			—			(3,369,447		)	—
	Due from subsidiaries and affiliates	296,752			—			—			(296,752		)	—
	Premiums receivable	—			—			474,087			—			474,087
	Prepaid reinsurance premiums	—			—			66,132			—			66,132
	Reinsurance recoverable	—			—			101,025			—			101,025
	Accrued investment income	—			110			33,955			—			34,065
	Deferred acquisition costs	—			—			81,684			—			81,684
	Receivable for investments sold	14			—			75,831			—			75,845
	Other assets	112,234			1,481			102,834			(100,000		)	116,549
	Total assets	$	3,923,244		$	179,120		$	7,842,966		$	(3,766,199	)	$	8,179,131
	Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity
	Liabilities
	Reserve for claims and claim expenses	$	—		$	—		$	1,563,730		$	—		$	1,563,730
	Unearned premiums	—			—			477,888			—			477,888
	Debt	—			249,430			—			—			249,430
Amounts due to subsidiaries and affiliates	—			3,173			—			(3,173		)	—
Reinsurance balances payable	—			—			293,022			—			293,022
Payable for investments purchased	—			—			193,221			—			193,221
Other liabilities	18,860			6,953			371,783			—			397,596
Total liabilities	18,860			259,556			2,899,644			(3,173		)	3,174,887
Redeemable noncontrolling interest	—			—			1,099,860			—			1,099,860
Shareholders’ Equity
Total shareholders’ equity	3,904,384			(80,436		)	3,843,462			(3,763,026		)	3,904,384
Total liabilities, redeemable noncontrolling interest and shareholders’ equity	$	3,923,244		$	179,120		$	7,842,966		$	(3,766,199	)	$	8,179,131
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)	'
	Condensed Consolidating Statement of Operations for	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	the three months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Revenues
	Net premiums earned	$	—		$	—		$	260,416		$	—		$	260,416
	Net investment income	736			445			34,293			(933		)	34,541
	Net foreign exchange gains	6			—			2,386			—			2,392
	Equity in earnings of other ventures	—			—			7,232			—			7,232
	Other loss	—			—			(535		)	—			(535		)
	Net realized and unrealized gains on investments	190			4,340			22,598			—			27,128
	Total revenues	932			4,785			326,390			(933		)	331,174
	Expenses
	Net claims and claim expenses incurred	—			—			81,388			—			81,388
	Acquisition expenses	—			—			33,477			—			33,477
	Operational expenses	(1,236		)	1,684			45,483			(90		)	45,841
	Corporate expenses	3,468			59			427			—			3,954
	Interest expense	—			3,616			676			—			4,292
	Total expenses	2,232			5,359			161,451			(90		)	168,952
	(Loss) income before equity in net income (loss) of subsidiaries and taxes	(1,300		)	(574		)	164,939			(843		)	162,222
	Equity in net income (loss) of subsidiaries	127,648			(38		)	—			(127,610		)	—
	Income (loss) before taxes	126,348			(612		)	164,939			(128,453		)	162,222
	Income tax (expense) benefit	—			(38		)	242			—			204
	Net income (loss)	126,348			(650		)	165,181			(128,453		)	162,426
	Net income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
	Net income (loss) attributable to RenaissanceRe	126,348			(650		)	129,103			(128,453		)	126,348
	Dividends on preference shares	(5,596		)	—			—			—			(5,596		)
	Net income (loss) attributable to RenaissanceRe common shareholders	$	120,752		$	(650	)	$	129,103		$	(128,453	)	$	120,752
	-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
	-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
	Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
		Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries
					Issuer)			and
								Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Comprehensive income (loss)
	Net income (loss)	$	126,348		$	(650	)	$	165,181		$	(128,453	)	$	162,426
	Change in net unrealized gains on investments	—			—			(45		)	—			(45		)
	Comprehensive income (loss)	126,348			(650		)	165,136			(128,453		)	162,381
	Net income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
	Comprehensive income attributable to noncontrolling interests	—			—			(36,078		)	—			(36,078		)
	Comprehensive income (loss) attributable to RenaissanceRe	$	126,348		$	(650	)	$	129,058		$	(128,453	)	$	126,303
	-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
	-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
	Condensed Consolidating Statement of Operations for	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	the six months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.			-2
		Guarantor)			(Subsidiary			Subsidiaries and
					Issuer)			Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Revenues
	Net premiums earned	$	—		$	—		$	546,950		$	—		$	546,950
	Net investment income	1,361			919			73,079			(1,870		)	73,489
Net foreign exchange gains	7			—			1,324			—			1,331
Equity in earnings of other ventures	—			—			11,431			—			11,431
Other loss	—			(8		)	(465		)	—			(473		)
Net realized and unrealized (losses) gains on investments	84			4,717			37,254			—			42,055
Total revenues	1,452			5,628			669,573			(1,870		)	674,783
Expenses
Net claims and claim expenses incurred	—			—			140,303			—			140,303
Acquisition expenses	—			—			67,177			—			67,177
Operational expenses	(2,116		)	3,578			87,171			(168		)	88,465
Corporate expenses	7,470			118			911			—			8,499
Interest expense	—			7,233			1,352			—			8,585
Total expenses	5,354			10,929			296,914			(168		)	313,029
(Loss) income before equity in net income of subsidiaries and taxes	(3,902		)	(5,301		)	372,659			(1,702		)	361,754
Equity in net income of subsidiaries	286,848			815			—			(287,663		)	—
Income (loss) before taxes	282,946			(4,486		)	372,659			(289,365		)	361,754
Income tax benefit (expense)	—			646			(608		)	—			38
Net income (loss)	282,946			(3,840		)	372,051			(289,365		)	361,792
Net income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Net income (loss) attributable to RenaissanceRe	282,946			(3,840		)	293,205			(289,365		)	282,946
Dividends on preference shares	(11,191		)	—			—			—			(11,191		)
Net income (loss) attributable to RenaissanceRe common shareholders	$	271,755		$	(3,840	)	$	293,205		$	(289,365	)	$	271,755
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the six months ended June 30, 2014	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	282,946		$	(3,840	)	$	372,051		$	(289,365	)	$	361,792
Change in net unrealized gains on investments	—			—			(213		)	—			(213		)
Comprehensive income (loss)	282,946			(3,840		)	371,838			(289,365		)	361,579
Net income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Comprehensive income attributable to noncontrolling interests	—			—			(78,846		)	—			(78,846		)
Comprehensive income (loss) attributable to RenaissanceRe	$	282,946		$	(3,840	)	$	292,992		$	(289,365	)	$	282,733
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
for the three months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	291,889		$	—		$	291,889
Net investment income	668			37			26,403			(945		)	26,163
Net foreign exchange losses	—			(2		)	(930		)	—			(932		)
Equity in earnings of other ventures	—			—			3,772			—			3,772
Other loss	—			—			(1,128		)	—			(1,128		)
Net realized and unrealized losses on investments	(158		)	(145		)	(69,226		)	—			(69,529		)
Total revenues	510			(110		)	250,780			(945		)	250,235
Expenses
Net claims and claim expenses incurred	—			—			103,962			—			103,962
Acquisition expenses	—			—			31,767			—			31,767
Operational expenses	(1,241		)	1,568			42,314			148			42,789
Corporate expenses	21,007			59			463			—			21,529
Interest expense	—			3,616			684			—			4,300
Total expenses	19,766			5,243			179,190			148			204,347
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(19,256		)	(5,353		)	71,590			(1,093		)	45,888
Equity in net income (loss) of subsidiaries	53,545			(4,197		)	—			(49,348		)	—
Income (loss) from continuing operations before taxes	34,289			(9,550		)	71,590			(50,441		)	45,888
Income tax (expense) benefit	—			(313		)	302			—			(11		)
Income (loss) from continuing operations	34,289			(9,863		)	71,892			(50,441		)	45,877
Income from discontinued operations	—			2,427			—			—			2,427
Net income (loss)	34,289			(7,436		)	71,892			(50,441		)	48,304
Net income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Net income (loss) attributable to RenaissanceRe	34,289			(7,436		)	57,877			(50,441		)	34,289
Dividends on preference shares	(7,483		)	—			—			—			(7,483		)
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$	26,806		$	(7,436	)	$	57,877		$	(50,441	)	$	26,806
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended June 30, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	34,289		$	(7,436	)	$	71,892		$	(50,441	)	$	48,304
Change in net unrealized gains on investments	—			—			(1,141		)	—			(1,141		)
Comprehensive income (loss)	34,289			(7,436		)	70,751			(50,441		)	47,163
Net income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Comprehensive income attributable to noncontrolling interests	—			—			(14,015		)	—			(14,015		)
Comprehensive income (loss) attributable to RenaissanceRe	$	34,289		$	(7,436	)	$	56,736		$	(50,441	)	$	33,148
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Operations	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
for the six months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Revenues
Net premiums earned	$	—		$	—		$	563,144		$	—		$	563,144
Net investment income	2,218			236			68,808			(1,897		)	69,365
Net foreign exchange losses	(50		)	(2		)	(266		)	—			(318		)
Equity in earnings of other ventures	—			—			9,607			—			9,607
Other income (loss)	106			—			(2,943		)	—			(2,837		)
Net realized and unrealized losses on investments	(1,444		)	(114		)	(53,702		)	—			(55,260		)
Total revenues	830			120			584,648			(1,897		)	583,701
Expenses
Net claims and claim expenses incurred	—			—			131,213			—			131,213
Acquisition expenses	—			—			56,776			—			56,776
Operational expenses	(2,463		)	4,017			87,221			—			88,775
Corporate expenses	24,909			118			984			—			26,011
Interest expense	734			7,233			1,367			—			9,334
Total expenses	23,180			11,368			277,561			—			312,109
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(22,350		)	(11,248		)	307,087			(1,897		)	271,592
Equity in net income of subsidiaries	253,388			(3,838		)	—			(249,550		)	—
Income (loss) from continuing operations before taxes	231,038			(15,086		)	307,087			(251,447		)	271,592
Income tax expense	—			(5		)	(128		)	—			(133		)
Income (loss) from continuing operations	231,038			(15,091		)	306,959			(251,447		)	271,459
Income from discontinued operations	—			12,201			—			—			12,201
Net income (loss)	231,038			(2,890		)	306,960			(251,448		)	283,660
Net income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Net income (loss) attributable to RenaissanceRe	231,038			(2,890		)	254,338			(251,448		)	231,038
Dividends on preference shares	(13,758		)	—			—			—			(13,758		)
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$	217,280		$	(2,890	)	$	254,338		$	(251,448	)	$	217,280
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income (Loss) for the six months ended June 30, 2013	RenaissanceRe			RenRe North			Other			Consolidating			RenaissanceRe
	Holdings Ltd.			America			RenaissanceRe			Adjustments			Consolidated
	(Parent			Holdings Inc.			Holdings Ltd.			-2
	Guarantor)			(Subsidiary			Subsidiaries
				Issuer)			and
							Eliminations
							(Non-guarantor
							Subsidiaries)
							-1
Comprehensive income (loss)
Net income (loss)	$	231,038		$	(2,890	)	$	306,960		$	(251,448	)	$	283,660
Change in net unrealized gains on investments	—			—			(8,713		)	—			(8,713		)
Comprehensive income (loss)	231,038			(2,890		)	298,247			(251,448		)	274,947
Net income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Comprehensive income attributable to noncontrolling interests	—			—			(52,622		)	—			(52,622		)
Comprehensive income (loss) attributable to RenaissanceRe	$	231,038		$	(2,890	)	$	245,625		$	(251,448	)	$	222,325
-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
-2	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statements Of Cash Flows	'
	Condensed Consolidating Statement of Cash Flows	RenaissanceRe			RenRe North			Other			RenaissanceRe
	for the six months ended June 30, 2014	Holdings Ltd.			America			RenaissanceRe			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.
		Guarantor)			(Subsidiary			Subsidiaries
					Issuer)			and
								Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Cash flows (used in) provided by operating activities
	Net cash (used in) provided by operating activities	$	(14,828	)	$	(8,410	)	$	196,624		$	173,386
	Cash flows provided by (used in) investing activities
	Proceeds from sales and maturities of fixed maturity investments trading	4,912			5,353			4,009,909			4,020,174
	Purchases of fixed maturity investments trading	(79,714		)	—			(3,890,603		)	(3,970,317		)
	Proceeds from sales and maturities of fixed maturity investments available for sale	—			—			5,114			5,114
	Net sales of equity investments trading	—			(370		)	(10,776		)	(11,146		)
	Net sales (purchases) of short term investments	116,511			(68		)	(26,894		)	89,549
	Net sales of other investments	—			—			68,684			68,684
	Net sales of investments in other ventures	—			—			1,030			1,030
	Net purchases of other assets	—			—			6,000			6,000
	Dividends and return of capital from subsidiaries	359,891			5,406			(365,297		)	—
	Contributions to subsidiaries	(47,220		)	(1,950		)	49,170			—
	Due to (from) subsidiary	4,123			(777		)	(3,346		)	—
	Net cash provided by (used in) investing activities	358,503			7,594			(157,009		)	209,088
	Cash flows used in financing activities
	Dividends paid – RenaissanceRe common shares	(23,550		)	—			—			(23,550		)
	Dividends paid – preference shares	(11,191		)	—			—			(11,191		)
	RenaissanceRe common share repurchases	(314,536		)	—			—			(314,536		)
	Net third party redeemable noncontrolling interest share transactions	—			—			(144,096		)	(144,096		)
	Net cash used in financing activities	(349,277		)	—			(144,096		)	(493,373		)
	Effect of exchange rate changes on foreign currency cash	—			—			(2,676		)	(2,676		)
	Net decrease in cash and cash equivalents	(5,602		)	(816		)	(107,157		)	(113,575		)
	Cash and cash equivalents, beginning of period	8,796			4,027			395,209			408,032
	Cash and cash equivalents, end of period	$	3,194		$	3,211		$	288,052		$	294,457
	-1	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
	Condensed Consolidating Statement of Cash Flows	RenaissanceRe			RenRe North			Other			RenaissanceRe
	for the six months ended June 30, 2013	Holdings Ltd.			America			RenaissanceRe			Consolidated
		(Parent			Holdings Inc.			Holdings Ltd.
		Guarantor)			(Subsidiary			Subsidiaries
					Issuer)			and
								Eliminations
								(Non-guarantor
								Subsidiaries)
								-1
	Cash flows (used in) provided by operating activities
	Net cash (used in) provided by operating activities	$	(42,805	)	$	(20,926	)	$	241,150		$	177,419
	Cash flows provided by (used in) investing activities
	Proceeds from sales and maturities of fixed maturity investments trading	409,514			64,535			3,974,400			4,448,449
	Purchases of fixed maturity investments trading	(20,604		)	(43,799		)	(4,160,785		)	(4,225,188		)
	Proceeds from sales and maturities of fixed maturity investments available for sale	—			—			41,338			41,338
	Net purchases of equity investments trading	—			—			(35,958		)	(35,958		)
	Net sales (purchases) of short term investments	98,000			10,396			(218,958		)	(110,562		)
	Net sales of other investments	—			—			42,935			42,935
	Net purchases of investments in other ventures	—			—			(2,500		)	(2,500		)
	Net sales of other assets	—			—			598			598
	Dividends and return of capital from subsidiaries	128,922			4,806			(133,728		)	—
	Contributions to subsidiaries	(296,179		)	(12,625		)	308,804			—
	Due to (from) subsidiaries	(11,753		)	339			11,414			—
	Net cash provided by (used in) investing activities	307,900			23,652			(172,440		)	159,112
	Cash flows used in financing activities
	Dividends paid – RenaissanceRe common shares	(24,658		)	—			—			(24,658		)
	Dividends paid – preference shares	(13,758		)	—			—			(13,758		)
	RenaissanceRe common share repurchases	(121,996		)	—			—			(121,996		)
Net repayment of debt	(100,000		)	—			(1,410		)	(101,410		)
Redemption 6.08% Series C preference shares	(125,000		)	—			—			(125,000		)
Redemption 6.60% Series D preference shares	(150,000		)	—			—			(150,000		)
Issuance of 5.375% Series E preference shares, net of expenses	265,655			—			—			265,655
Net third party redeemable noncontrolling interest share transactions	—			—			(105,633		)	(105,633		)
Net cash used in financing activities	(269,757		)	—			(107,043		)	(376,800		)
Effect of exchange rate changes on foreign currency cash	—			—			505			505
Net (decrease) increase in cash and cash equivalents	(4,662		)	2,726			(37,828		)	(39,764		)
Net increase in cash and cash equivalents of discontinued operations	—			—			(29,475		)	(29,475		)
Cash and cash equivalents, beginning of period	6,298			1,528			296,319			304,145
Cash and cash equivalents, end of period	$	1,636		$	4,254		$	229,016		$	234,906
(1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Oct. 02, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Expenses	'	'	'	'	'
Income from discontinued operations	'	'	$2,427,000	$0	$12,201,000
REAL	'	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'
Cash paid at closing	60,000,000	'	'	'	'
Loss on sale	-8,800,000	'	'	'	'
Revenues	'	'	'	'	'
Net investment income	'	0	1,161,000	0	1,153,000
Net foreign exchange (losses) gains	'	0	-153,000	0	989,000
Other income	'	0	1,759,000	0	10,472,000
Net realized and unrealized losses on investments	'	0	-15,000	0	-13,000
Total revenues	'	0	2,752,000	0	12,601,000
Expenses	'	'	'	'	'
Operational expenses	'	0	31,000	0	59,000
Corporate expenses	'	0	59,000	0	106,000
Total expenses	'	0	90,000	0	165,000
Income before taxes	'	0	2,662,000	0	12,436,000
Income tax expense	'	0	-236,000	0	-236,000
Income from discontinued operations	'	$0	$2,426,000	$0	$12,200,000

Investments_Schedule_of_Fair_V

Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	$4,841,609	$4,809,036
U.S. treasuries	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	1,706,929	1,352,413
Agencies	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	121,650	186,050
Non-U.S. government (Sovereign Debt)	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	271,495	334,580
Non-U.S. government-backed corporate	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	163,911	237,479
Corporate	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	1,580,038	1,803,415
Agency mortgage-backed	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	321,629	336,661
Non-agency mortgage-backed	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	252,530	243,795
Commercial mortgage-backed	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	392,085	303,214
Asset-backed	'	'
Investment [Line Items]	'	'
Fixed maturity investments trading, at fair value	$31,342	$11,429

Investments_Schedule_of_Fair_V1

Investments (Schedule of Fair Value of Fixed Maturity Investments Available for Sale) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	$25,512		$30,273
Available for Sale, Fair Value	29,219		34,241
Fixed maturity investments	'		'
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	25,512		30,273
Gross Unrealized Gains	3,710		3,985
Gross Unrealized Losses	-3		-17
Available for Sale, Fair Value	29,219		34,241
Non-Credit Other-Than-Temporary Impairments	-698	[1]	-742	[1]
Agency mortgage-backed	'		'
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	4,279		4,880
Gross Unrealized Gains	396		378
Gross Unrealized Losses	0		-11
Available for Sale, Fair Value	4,675		5,247
Non-Credit Other-Than-Temporary Impairments	0	[1]	0	[1]
Non-agency mortgage-backed	'		'
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	10,509		11,735
Gross Unrealized Gains	2,304		2,414
Gross Unrealized Losses	-3		-6
Available for Sale, Fair Value	12,810		14,143
Non-Credit Other-Than-Temporary Impairments	-698	[1]	-742	[1]
Commercial mortgage-backed	'		'
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	7,373		10,052
Gross Unrealized Gains	830		970
Gross Unrealized Losses	0		0
Available for Sale, Fair Value	8,203		11,022
Non-Credit Other-Than-Temporary Impairments	0	[1]	0	[1]
Asset-backed	'		'
Investment [Line Items]	'		'
Available for Sale, Amortized Cost	3,351		3,606
Gross Unrealized Gains	180		223
Gross Unrealized Losses	0		0
Available for Sale, Fair Value	3,531		3,829
Non-Credit Other-Than-Temporary Impairments	$0	[1]	$0	[1]
[1]	Represents the non-credit component of other-than-temporary impairments recognized in accumulated other comprehensive income adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.

Investments_Schedule_of_Contra

Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Trading Securities [Abstract]	'	'
Trading Debt Securities, Amortized Cost, Due in less than one year	$100,250	'
Trading Debt Securities, Amortized Cost, Due after one through five years	3,057,740	'
Trading Debt Securities, Amortized Cost, Due after five through ten years	520,699	'
Trading Debt Securities, Amortized Cost, Due after ten years	102,944	'
Trading Debt Securities, Amortized Cost	4,754,480	'
Trading Debt Securities, Fair Value, Due in less than one year	100,765	'
Trading Debt Securities, Fair Value, Due after one through five years	3,080,879	'
Trading Debt Securities, Fair Value, Due after five through ten years	529,811	'
Trading Debt Securities, Fair Value, Due after ten years	132,568	'
Trading Debt Securities, Fair Value	4,841,609	'
Available-for-sale Securities [Abstract]	'	'
Available for Sale, Amortized Cost, Due in less than one year	0	'
Available for Sale, Amortized Cost, Due after one through five years	0	'
Available for Sale, Amortized Cost, Due after five through ten years	0	'
Available for Sale, Amortized Cost, Due after ten years	0	'
Available for Sale, Amortized Cost	25,512	30,273
Available for Sale, Fair Value, Due in less than one year	0	'
Available for Sale, Fair Value, Due after one through five years	0	'
Available for Sale, Fair Value, Due after five through ten years	0	'
Available for Sale, Fair Value, Due after ten years	0	'
Available for Sale, Fair Value	29,219	34,241
Fixed Maturity Investments [Abstract]	'	'
Debt Securities, Amortized Cost, Due in less than one year	100,250	'
Debt Securities, Amortized Cost, Due after one through five years	3,057,740	'
Debt Securities, Amortized Cost, Due after five through ten years	520,699	'
Debt Securities, Amortized Cost, Due after ten years	102,944	'
Debt Securities, Amortized Cost	4,779,992	'
Debt Securities, Fair Value, Due in less than one year	100,765	'
Debt Securities, Fair Value, Due after one through give years	3,080,879	'
Debt Securities, Fair Value, Due after five through ten years	529,811	'
Debt Securities, Fair Value, Due after ten years	132,568	'
Debt Securities, Fair Value	4,870,828	'
Mortgage-backed	'	'
Trading Securities [Abstract]	'	'
Trading Debt Securities, Amortized Cost	943,257	'
Trading Debt Securities, Fair Value	966,244	'
Available-for-sale Securities [Abstract]	'	'
Available for Sale, Amortized Cost	22,161	'
Available for Sale, Fair Value	25,688	'
Fixed Maturity Investments [Abstract]	'	'
Debt Securities, Amortized Cost	965,418	'
Debt Securities, Fair Value	991,932	'
Asset-backed	'	'
Trading Securities [Abstract]	'	'
Trading Debt Securities, Amortized Cost	29,590	'
Trading Debt Securities, Fair Value	31,342	'
Available-for-sale Securities [Abstract]	'	'
Available for Sale, Amortized Cost	3,351	'
Available for Sale, Fair Value	3,531	'
Fixed Maturity Investments [Abstract]	'	'
Debt Securities, Amortized Cost	32,941	'
Debt Securities, Fair Value	$34,873	'

Investments_Schedule_of_Fair_V2

Investments (Schedule of Fair Value of Equity Investments Trading) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	$254,408	$254,776
Financials	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	153,099	152,905
Consumer	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	18,302	44,115
Industrial, utilities and energy	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	32,127	25,350
Healthcare	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	15,609	15,340
Basic materials	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	4,026	12,766
Communications and technology	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Equity investments trading	$31,245	$4,300

Investments_Pledged_Investment

Investments (Pledged Investments) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments [Abstract]	'	'
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties	$2,036.30	$2,081.10
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities	$673.90	$652.80

Investments_Reverse_Purchase_A

Investments (Reverse Purchase Agreements) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Value of reverse repurchase agreements	$35.90	$37.30
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%	'

Investments_Schedule_of_Net_In

Investments (Schedule of Net Investment Income) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	$37,353	$28,999	$79,135	$75,141
Investment expenses	-2,812	-2,836	-5,646	-5,776
Net investment income	34,541	26,163	73,489	69,365
Fixed maturity investments	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	26,372	22,839	50,232	46,725
Short term investments	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	286	426	476	755
Equity investments	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	779	344	1,575	344
Other investments, Hedge funds and private equity investments	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	8,340	2,237	20,657	17,117
Other investments, Other	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	1,483	3,144	6,011	10,139
Cash and cash equivalents	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income before investment expenses	$93	$9	$184	$61

Investments_Schedule_of_Net_Re

Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Gain (Loss) on Investments [Line Items]	'	'	'	'
Net realized and unrealized gains on investments	$27,128	($69,529)	$42,055	($55,260)
Fixed maturity investments	'	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'	'
Gross realized gains	12,166	17,548	25,633	51,624
Gross realized losses	-2,587	-14,601	-8,151	-19,155
Net realized gains on fixed maturity investments	9,579	2,947	17,482	32,469
Net unrealized gains (losses) on investments trading	29,918	-95,680	57,800	-118,743
Derivatives	'	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'	'
Net realized and unrealized (losses) gains on investments-related derivatives	-6,884	20,510	-17,783	20,931
Equity investments	'	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'	'
Net unrealized gains (losses) on investments trading	-10,619	2,620	-20,499	-7,552
Net realized gains on equity investments trading	$5,134	$74	$5,055	$17,635

Investments_Schedule_of_Compon

Investments (Schedule of Components of Other Comprehensive Income and Reclassification Out of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) Rollforward	'	'	'	'
Beginning balance	$3,963	$6,050	$4,131	$13,622
Other comprehensive income (loss) before reclassifications	-45	178	-213	-1,533
Amounts reclassified from accumulated other comprehensive income by statement of operations line item:	'	'	'	'
Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	'	-1,319	'	-7,180
Net current-period other comprehensive loss	'	-1,141	'	-8,713
Ending balance	3,918	4,909	3,918	4,909
Investments in other ventures	'	'	'	'
Accumulated Other Comprehensive Income (Loss) Rollforward	'	'	'	'
Beginning balance	160	120	163	1,625
Other comprehensive income (loss) before reclassifications	51	98	48	-1,407
Amounts reclassified from accumulated other comprehensive income by statement of operations line item:	'	'	'	'
Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	'	0	'	0
Net current-period other comprehensive loss	'	98	'	-1,407
Ending balance	211	218	211	218
Fixed maturity investments available for sale	'	'	'	'
Accumulated Other Comprehensive Income (Loss) Rollforward	'	'	'	'
Beginning balance	3,803	5,930	3,968	11,997
Other comprehensive income (loss) before reclassifications	-96	80	-261	-126
Amounts reclassified from accumulated other comprehensive income by statement of operations line item:	'	'	'	'
Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments	'	-1,319	'	-7,180
Net current-period other comprehensive loss	'	-1,239	'	-7,306
Ending balance	$3,707	$4,691	$3,707	$4,691

Investments_Schedule_of_Fixed_

Investments (Schedule of Fixed Maturity Investments Available For Sale In Continual Unrealized Loss Position) (Details) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Fixed maturity investments available for sale in a unrealized loss position	2	4
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	2	2
Fixed maturity investments	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	$0	$765
Less than 12 Months, Unrealized Losses	0	-11
12 Months or Greater, Fair Value	76	89
12 Months or Greater, Unrealized Losses	-3	-6
Total, Fair Value	76	854
Total, Unrealized Losses	-3	-17
Agency mortgage-backed	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	'	726
Less than 12 Months, Unrealized Losses	'	-11
12 Months or Greater, Fair Value	'	0
12 Months or Greater, Unrealized Losses	'	0
Total, Fair Value	'	726
Total, Unrealized Losses	'	-11
Non-agency mortgage-backed	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Greater, Fair Value	76	89
12 Months or Greater, Unrealized Losses	-3	-6
Total, Fair Value	76	89
Total, Unrealized Losses	-3	-6
Commercial mortgage-backed	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Fair Value	'	39
Less than 12 Months, Unrealized Losses	'	0
12 Months or Greater, Fair Value	'	0
12 Months or Greater, Unrealized Losses	'	0
Total, Fair Value	'	39
Total, Unrealized Losses	'	$0

Investments_Rollforward_of_The

Investments (Rollforward of The Amount of Other-Than-Temporary Impairments Related to Credit Losses Recognized in Earnings for Which a Portion of an Other-Than-Temporary Impairment was Recognized in Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments [Abstract]	'	'	'	'
Net other-than-temporary impairments	'	'	$0	$0
Portion of other-than-temporary impairments recognized in other comprehensive income	'	'	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]	'	'	'	'
Beginning balance	545	811	561	838
Reductions:	'	'	'	'
Securities sold during the period	-16	-20	-32	-47
Ending balance	$529	$791	$529	$791

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	$4,870,828		$4,843,277
Short term investments	957,698		1,044,779
Equity investments trading	254,408		254,776
Other investments	513,614		573,264
Other assets and (liabilities)	1,277		-8,233
Total assets and liabilities measured on recurring basis	6,597,825		6,707,863
U.S. treasuries	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	1,706,929		1,352,413
Agencies	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	121,650		186,050
Non-U.S. government (Sovereign Debt)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	271,495		334,580
Non-U.S. government-backed corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	163,911		237,479
Corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	1,580,038		1,803,415
Agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	326,304		341,908
Non-agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	265,340		257,938
Commercial mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	400,288		314,236
Asset-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	34,873		15,258
Private equity partnerships	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	314,983		322,391
Catastrophe bonds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	179,465		229,016
Senior secured bank loan funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	15,976		18,048
Hedge funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	3,190		3,809
Derivatives	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	6,491	[1]	4,758	[1]
Other	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	-5,214		-12,991
Quoted Prices In Active Markets For Identical Assets (Level 1)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	1,706,929		1,352,413
Short term investments	0		0
Equity investments trading	254,408		254,776
Other investments	0		0
Other assets and (liabilities)	-340		823
Total assets and liabilities measured on recurring basis	1,960,997		1,608,012
Quoted Prices In Active Markets For Identical Assets (Level 1) | U.S. treasuries	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	1,706,929		1,352,413
Quoted Prices In Active Markets For Identical Assets (Level 1) | Agencies	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-U.S. government (Sovereign Debt)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-U.S. government-backed corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Non-agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Commercial mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Asset-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Private equity partnerships	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Catastrophe bonds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Senior secured bank loan funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Hedge funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Derivatives	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	-340	[1]	823	[1]
Quoted Prices In Active Markets For Identical Assets (Level 1) | Other	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	0		0
Significant Other Observable Inputs (Level 2)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	3,117,723		3,463,284
Short term investments	957,698		1,044,779
Equity investments trading	0		0
Other investments	179,465		229,016
Other assets and (liabilities)	546		-6,566
Total assets and liabilities measured on recurring basis	4,255,432		4,730,513
Significant Other Observable Inputs (Level 2) | U.S. treasuries	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Other Observable Inputs (Level 2) | Agencies	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	121,650		186,050
Significant Other Observable Inputs (Level 2) | Non-U.S. government (Sovereign Debt)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	271,495		334,580
Significant Other Observable Inputs (Level 2) | Non-U.S. government-backed corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	163,911		237,479
Significant Other Observable Inputs (Level 2) | Corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	1,533,862		1,775,835
Significant Other Observable Inputs (Level 2) | Agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	326,304		341,908
Significant Other Observable Inputs (Level 2) | Non-agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	265,340		257,938
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	400,288		314,236
Significant Other Observable Inputs (Level 2) | Asset-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	34,873		15,258
Significant Other Observable Inputs (Level 2) | Private equity partnerships	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Significant Other Observable Inputs (Level 2) | Catastrophe bonds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	179,465		229,016
Significant Other Observable Inputs (Level 2) | Senior secured bank loan funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Significant Other Observable Inputs (Level 2) | Hedge funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Significant Other Observable Inputs (Level 2) | Derivatives	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	5,760	[1]	6,425	[1]
Significant Other Observable Inputs (Level 2) | Other	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	-5,214		-12,991
Significant Unobservable Inputs (Level 3)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	46,176		27,580
Short term investments	0		0
Equity investments trading	0		0
Other investments	334,149		344,248
Other assets and (liabilities)	1,071		-2,490
Total assets and liabilities measured on recurring basis	381,396		369,338
Significant Unobservable Inputs (Level 3) | U.S. treasuries	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Agencies	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Non-U.S. government (Sovereign Debt)	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Non-U.S. government-backed corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Corporate	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	46,176		27,580
Significant Unobservable Inputs (Level 3) | Agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Non-agency mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Asset-backed	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Fixed maturity investments	0		0
Significant Unobservable Inputs (Level 3) | Private equity partnerships	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	314,983		322,391
Significant Unobservable Inputs (Level 3) | Catastrophe bonds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	0		0
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	15,976		18,048
Significant Unobservable Inputs (Level 3) | Hedge funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other investments	3,190		3,809
Significant Unobservable Inputs (Level 3) | Derivatives	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	1,071	[1]	-2,490	[1]
Significant Unobservable Inputs (Level 3) | Other	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Other assets and (liabilities)	$0		$0
[1]	See “Note 12. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

Share data in Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2010

Jun. 30, 2014

Dec. 31, 2013

Mar. 17, 2010

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 28, 2014

Jun. 30, 2014

Other Investments

Other Investments

Other Investments

Other Investments

5.75% Senior Notes Due March 15, 2020

5.75% Senior Notes Due March 15, 2020

5.75% Senior Notes Due March 15, 2020

5.75% Senior Notes Due March 15, 2020

Significant Other Observable Inputs (Level 2)

Significant Other Observable Inputs (Level 2)

Significant Other Observable Inputs (Level 2)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Quoted Prices In Active Markets For Identical Assets (Level 1)

Quoted Prices In Active Markets For Identical Assets (Level 1)

U.S. treasuries

U.S. treasuries

Agencies

Agencies

Non-U.S. government (Sovereign Debt)

Non-U.S. government (Sovereign Debt)

Non-U.S. government-backed corporate

Non-U.S. government-backed corporate

Corporate

Corporate

Agency mortgage-backed

Agency mortgage-backed

Non-agency prime residential mortgage-backed

Non-agency prime residential mortgage-backed

AltA non-agency mortgage-backed

AltA non-agency mortgage-backed

Commercial mortgage-backed

Commercial mortgage-backed

Asset-backed

Asset-backed

Senior secured bank loan funds

Private equity partnerships

Hedge funds

Common Shares

Call Rights

Net investment income

Net investment income

Net investment income

Net investment income

RenRe North America Holdings Inc.

RenRe North America Holdings Inc.

RenRe North America Holdings Inc.

RenRe North America Holdings Inc.

Cash Settled Restricted Stock Unit

Hedge funds

Hedge funds

Hedge funds

Hedge funds

Senior secured bank loan funds

Senior secured bank loan funds

Private equity partnerships

Private equity partnerships

Private equity partnerships

Private equity partnerships

Corporate

Corporate

Corporate

Private Equity Funds

Trupanion

Net Asset Valuation Technique

Minimum

Maximum

Weighted Average or Actual

Net Asset Valuation Technique

Weighted Average or Actual

Net Asset Valuation Technique

Minimum

Maximum

Weighted Average or Actual

Discounted Cash Flow Valuation Technique

Internal Valuation Model Valuation Technique

Weighted Average or Actual

Net Asset Valuation Technique

Subsequent Event

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Discounted Cash Flow Valuation Technique

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

'

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Liabilities, fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($1,071,000)

'

'

'

'

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'

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'

'

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'

'

'

'

'

'

'

Weighted average effective yield

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.90%

0.80%

1.40%

1.30%

1.20%

1.30%

1.30%

1.10%

2.70%

2.70%

2.20%

2.90%

3.20%

3.70%

4.00%

4.70%

2.00%

2.10%

1.30%

2.00%

'

'

'

'

'

Weighted average life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'5 years 2 months 12 days

'6 years 2 months 12 days

'4 years 3 months 18 days

'4 years 4 months 24 days

'4 years 6 months 0 days

'4 years

'3 years 10 months 24 days

'3 years 3 months 18 days

'2 years 4 months 24 days

'3 years 6 months

'

'

'

'

'

Other assets and (liabilities)

1,277,000

'

-8,233,000

'

'

'

'

'

'

'

'

546,000

-6,566,000

-5,200,000

1,071,000

-2,490,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-340,000

823,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets, fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

381,396,000

'

3,190,000

'

'

'

15,976,000

'

314,983,000

'

'

'

15,938,000

30,238,000

'

314,983,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investment Owned, Balance, Shares

'

'

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'

'

'

'

'

'

'

2.5

'

Investment Owned, at Fair Value

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,100,000

'

Dividend rate

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liquidity discount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

1.00%

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'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk-free rate

'

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'

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'

'

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'

'

'

'

'

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'

'

'

'

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'

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'

'

0.30%

'

'

'

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'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

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Credit spread

'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

Estimated performance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

0.00%

0.00%

'

0.70%

'

-3.00%

18.90%

4.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.75% Senior notes issued

'

'

'

'

'

'

'

'

'

'

250,000,000

'

'

'

'

'

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'

'

'

'

'

'

Senior notes interest rate

'

'

'

'

'

'

'

'

5.75%

'

'

'

'

'

'

'

'

'

'

'

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'

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

Debt instrument maturity date

'

'

'

'

'

'

'

'March 15, 2020

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes, Fair value

'

'

'

'

'

'

'

'

269,700,000

273,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net unrealized gains (losses) recognized in earnings

8,879,000

10,959,000

'

3,900,000

-5,300,000

8,900,000

9,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum estimated liquidation period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years

'7 years

'

'

'

Maximum estimated liquidation period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'10 years

'

'

'

Investment in closed end fund

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,000,000

'

'

'

'

Hedge fund side pocket investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,200,000

'

'

Derivative Asset

$9,946,000

'

$10,667,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,200,000

Fair_Value_Measurements_Quanti

Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

In Thousands, unless otherwise specified

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Significant Unobservable Inputs (Level 3)

Corporate

Corporate

Corporate

Fixed maturity investments

Private equity partnerships

Private equity partnerships

Private equity partnerships

Private equity partnerships

Senior secured bank loan funds

Senior secured bank loan funds

Hedge funds

Hedge funds

Hedge funds

Hedge funds

Other Investments

Weather Contract

Private equity partnerships

Senior secured bank loan funds

Hedge funds

Discounted Cash Flow Valuation Technique

Discounted Cash Flow Valuation Technique

Internal Valuation Model Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Internal Valuation Model Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Net Asset Valuation Technique

Weighted Average or Actual

Low

Maximum

Weighted Average or Actual

Weighted Average or Actual

Low

Maximum

Weighted Average or Actual

Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets, fair value

'

'

$381,396

$15,938

'

$30,238

$46,176

$314,983

'

'

'

$15,976

'

$3,190

'

'

'

$334,149

'

$314,983

$15,976

$3,190

Liabilities, fair value

'

'

1,071

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1,149

'

'

'

Derivative Asset

$9,946

$10,667

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit spread

'

'

'

'

1.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liquidity discount

'

'

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk-free rate

'

'

'

'

0.30%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividend rate

'

'

'

'

6.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated performance

'

'

'

'

'

'

'

'

-3.00%

18.90%

4.00%

'

0.70%

'

0.00%

0.00%

0.00%

'

'

'

'

'

Fair_Value_Measurements_Assets1

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Balance at beginning of the period	$378,609	$431,574	$369,338	$430,372
Total unrealized gains (losses)	'	'	'	'
Included in net investment income	10,796	-2,259	29,446	11,032
Included in other income (loss)	2,220	-676	2,220	-2,646
Total foreign exchange gains (losses)	-226	364	-253	-417
Purchases	10,391	18,411	25,392	29,196
Sales	'	-424	'	'
Settlements	-20,394	-27,828	-44,747	-47,527
Reclassified from other assets to other investments	'	'	'	0
Balance at end of the period	381,396	420,010	381,396	420,010
Net investment income	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	10,796	-2,259	29,446	11,032
Other loss	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	2,220	'	2,220	'
Fixed maturity investments	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Balance at beginning of the period	37,138	28,067	27,580	27,792
Total unrealized gains (losses)	'	'	'	'
Included in net investment income	9,038	114	18,596	389
Included in other income (loss)	0	0	0	0
Total foreign exchange gains (losses)	0	0	0	0
Purchases	0	0	0	0
Sales	'	0	'	'
Settlements	0	-2,500	0	-2,500
Reclassified from other assets to other investments	'	'	'	0
Balance at end of the period	46,176	25,681	46,176	25,681
Fixed maturity investments | Net investment income	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	9,038	114	18,596	389
Fixed maturity investments | Other loss	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	0	'	0	'
Other Investments	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Balance at beginning of the period	342,778	402,206	344,248	381,067
Total unrealized gains (losses)	'	'	'	'
Included in net investment income	1,579	-2,373	9,455	10,643
Included in other income (loss)	0	0	0	0
Total foreign exchange gains (losses)	-205	364	-199	-417
Purchases	10,391	18,411	25,392	29,196
Sales	'	-424	'	'
Settlements	-20,394	-25,328	-44,747	-45,027
Reclassified from other assets to other investments	'	'	'	18,242
Balance at end of the period	334,149	393,704	334,149	393,704
Other Investments | Net investment income	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	1,579	-2,373	9,455	10,643
Other Investments | Other loss	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	0	'	0	'
Other Assets and Liabilities	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Balance at beginning of the period	-1,307	1,301	-2,490	21,513
Total unrealized gains (losses)	'	'	'	'
Included in net investment income	179	0	1,395	0
Included in other income (loss)	2,220	-676	2,220	-2,646
Total foreign exchange gains (losses)	-21	0	-54	0
Purchases	0	0	0	0
Sales	'	0	'	'
Settlements	0	0	0	0
Reclassified from other assets to other investments	'	'	'	-18,242
Balance at end of the period	1,071	625	1,071	625
Other Assets and Liabilities | Net investment income	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	179	0	1,395	0
Other Assets and Liabilities | Other loss	'	'	'	'
Total unrealized gains (losses)	'	'	'	'
Change in unrealized gains for the period included in earnings for assets held at the end of the period	$2,220	'	$2,220	'

Fair_Value_Measurements_Summar

Fair Value Measurements (Summary Of The Balances Company Has Elected To Account For At Fair Value) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Other investments	$513,614	$573,264

Fair_Value_Measurements_Compan

Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'
Fair Value	$334,149
Unfunded Commitments	93,801
Private equity partnerships	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'
Fair Value	314,983
Unfunded Commitments	84,529
Senior secured bank loan funds	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'
Fair Value	15,976
Unfunded Commitments	9,272
Hedge funds	'
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]	'
Fair Value	3,190
Unfunded Commitments	$0

Reinsurance_Effect_Of_Reinsura

Reinsurance (Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Premiums written	'	'	'	'
Direct	$19,707	$16,333	$33,562	$26,650
Assumed	491,833	686,890	1,183,238	1,311,991
Ceded	-165,133	-144,114	-420,046	-342,719
Net premiums written	346,407	559,109	796,754	995,922
Premiums earned	'	'	'	'
Direct	14,949	10,789	29,178	20,662
Assumed	350,389	380,626	735,987	747,479
Ceded	-104,922	-99,526	-218,215	-204,997
Net premiums earned	260,416	291,889	546,950	563,144
Claims and claim expenses	'	'	'	'
Gross claims and claim expenses incurred	97,064	116,995	165,214	150,993
Claims and claim expenses recovered	-15,676	-13,033	-24,911	-19,780
Net claims and claim expenses incurred	$81,388	$103,962	$140,303	$131,213

Noncontrolling_Interests_Narra

Noncontrolling Interests (Narrative) (Details) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Dec. 01, 2013

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Feb. 28, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2014

Jan. 31, 2014

Jan. 03, 2014

Dec. 31, 2013

Mar. 31, 2013

Jan. 02, 2013

Dec. 31, 2012

Jan. 31, 2014

Jan. 31, 2013

Sep. 30, 2013

Jun. 30, 2014

Jun. 01, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Angus

Angus

Angus

Angus

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

DaVinciRe

Medici

Medici

Medici

Medici

Medici

Medici

Medici

Medici

Medici

Angus Fund

Angus Fund

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interest

RRV U.S. Holdings LLC

RenTech U.S. Holdings LLC

Maximum

Redeemable Noncontrolling Interest [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Redemption Provision, Notice Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'30 days

'

'

'

'

'

'

'

Noncontrolling Interest, Increase from Subsidiary Equity Issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$37,200,000

'

'

$57,100,000

'

'

'

'

'

'

'

Parent company ownership in redeemable noncontrolling interest

'

'

'

'

'

'

'

26.50%

'

26.50%

'

'

'

26.50%

27.30%

'

32.90%

30.80%

'

'

'

'

'

49.30%

'

49.30%

'

'

73.90%

'

'

1.10%

35.00%

Redeemable Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Reserve Holdback Payments

'

'

'

'

'

'

30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share repurchase requests, limit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

Redeemable noncontrolling interest, reserve holdback

'

'

'

'

'

'

'

'

'

'

'

'

60,000,000

'

'

'

'

'

'

20,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from sale of partial interest in consolidated subsidiary

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

77,400,000

'

'

'

'

'

'

'

'

'

'

'

'

Redeemable noncontrolling interests

1,023,892,000

1,099,860,000

'

'

'

'

'

930,231,000

889,116,000

930,231,000

889,116,000

895,391,000

'

'

1,063,368,000

875,770,000

'

968,259,000

'

'

'

'

'

93,661,000

8,007,000

93,661,000

8,007,000

91,590,000

36,492,000

0

0

'

'

Issuance of equity to third party investors

'

'

'

'

'

'

'

0

0

9,722,000

54,927,000

'

'

'

'

'

'

'

'

'

'

'

'

1,699,000

8,000,000

57,084,000

8,000,000

'

'

'

'

'

'

Redeemable noncontrolling interest, net redemptions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Investments in subsidiaries

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55,000

2,000,000

Redemption of shares from redeemable noncontrolling interest

'

'

'

'

'

'

'

866,000

663,000

219,745,000

186,894,000

'

'

'

'

'

'

'

'

'

'

'

1,325,000

0

0

1,875,000

0

'

'

'

'

'

'

Non Cash Transfer To Acquire Equity Method Investments

'

'

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Ownership Percentage

'

'

'

40.40%

42.50%

38.80%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill, Acquired During Period

'

'

$1,705,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling_Interests_Sched

Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 01, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Activity in redeemable noncontrolling interest	'	'	'	'	'
Beginning balance	'	'	'	$1,099,860	'
Net income attributable to redeemable noncontrolling interest	'	36,078	14,015	78,846	52,622
Ending balance	'	1,023,892	'	1,023,892	'
DaVinciRe	'	'	'	'	'
Activity in redeemable noncontrolling interest	'	'	'	'	'
Beginning balance	'	895,391	875,770	1,063,368	968,259
Redemption of shares from redeemable noncontrolling interest	'	-866	-663	-219,745	-186,894
Sale of shares to redeemable noncontrolling interests	'	0	0	9,722	54,927
Net income attributable to redeemable noncontrolling interest	'	35,706	14,009	76,886	52,824
Ending balance	'	930,231	889,116	930,231	889,116
Medici	'	'	'	'	'
Activity in redeemable noncontrolling interest	'	'	'	'	'
Beginning balance	'	91,590	0	36,492	0
Redemption of shares from redeemable noncontrolling interest	-1,325	0	0	-1,875	0
Sale of shares to redeemable noncontrolling interests	'	1,699	8,000	57,084	8,000
Net income attributable to redeemable noncontrolling interest	'	372	7	1,960	7
Ending balance	'	93,661	8,007	93,661	8,007
Angus Fund	'	'	'	'	'
Activity in redeemable noncontrolling interest	'	'	'	'	'
Net income attributable to redeemable noncontrolling interest	'	$0	($1)	$0	($209)

Noncontrolling_Interests_Activ

Noncontrolling Interests (Activity in noncontrolling interest) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Activity in noncontrolling interest	'	'	'	'
Net loss attributable to noncontrolling interest	$36,078	$14,015	$78,846	$52,622
Angus Fund	'	'	'	'
Activity in noncontrolling interest	'	'	'	'
Beginning balance	0	3,747	0	3,991
Adjustment of ownership interest	0	0	0	139
Net loss attributable to noncontrolling interest	0	-1	0	-209
Dividends on common shares	0	-53	0	-228
Ending balance	$0	$3,693	$0	$3,693

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Jan. 02, 2013

Jun. 30, 2014

Mar. 31, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jan. 02, 2013

Jun. 30, 2014

Mar. 31, 2014

Jul. 02, 2013

Upsilon RFO

Upsilon RFO

Upsilon RFO

Upsilon RFO

Upsilon RFO

Mona Lisa Re Ltd

Mona Lisa Re Ltd

Mona Lisa Re Ltd

Mona Lisa Re Ltd

Mona Lisa Re Ltd

Mona Lisa Re Ltd

Non-Voting Preference Shares

Non-Voting Preference Shares

Non-Voting Preference Shares

Non-Voting Preference Shares

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Renaissance Reinsurance

Renaissance Reinsurance

DaVinciRe

DaVinciRe

Variable Interest Entity, Not Primary Beneficiary

Variable Interest Entity, Not Primary Beneficiary

Upsilon RFO

Upsilon RFO

Upsilon RFO

Upsilon RFO

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity, Primary Beneficiary

Variable Interest Entity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross premiums written

$511,540,000

$703,223,000

$1,216,800,000

$1,338,641,000

'

'

$53,500,000

'

'

'

$2,000,000

$1,200,000

$1,900,000

$1,200,000

'

'

'

'

'

'

Ceded premiums earned

104,922,000

99,526,000

218,215,000

204,997,000

'

'

'

'

'

'

5,000,000

300,000

3,600,000

300,000

'

'

'

'

'

'

Issuance of equity to third party investors

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

61,000,000

43,100,000

172,400,000

'

Contributions to subsidiaries

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

76,400,000

13,500,000

109,700,000

'

Variable interest entity, ownership percentage

'

'

'

'

'

25.80%

55.60%

23.90%

38.90%

'

'

'

'

'

'

'

'

'

'

'

Increase (decrease) in funds held under insurance agreements

'

'

'

'

'

'

17,500,000

5,000,000

15,000,000

'

'

'

'

'

'

'

'

'

'

'

Risk participation percentage

'

'

'

'

'

'

42.90%

15.00%

33.60%

30.50%

'

'

'

'

'

'

'

'

'

'

Proceeds from sale of partial interest in consolidated subsidiary

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

Assets

8,515,625,000

'

8,515,625,000

'

8,179,131,000

474,200,000

'

487,000,000

'

487,000,000

'

'

'

'

179,115,000

209,615,000

'

'

'

'

Liabilities

3,655,792,000

'

3,655,792,000

'

3,174,887,000

474,200,000

'

487,000,000

'

487,000,000

'

'

'

'

179,115,000

209,615,000

'

'

'

'

Other liabilities

$164,650,000

'

$164,650,000

'

$397,596,000

$156,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

1 Months Ended

6 Months Ended

0 Months Ended

1 Months Ended

6 Months Ended

Jun. 13, 2014

Mar. 14, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

20-May-14

Jun. 30, 2014

Jun. 27, 2013

Mar. 31, 2004

Jun. 30, 2014

Jun. 27, 2013

Dec. 27, 2012

Dec. 31, 2006

31-May-13

Jun. 30, 2014

Jun. 30, 2013

director

director

Retained Earnings

Retained Earnings

Common Shares

Common Shares

Series C Preferred Stock

Series C Preferred Stock

Series C Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

period

period

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends declared, Per common share

$0.29

$0.29

'

$0.28

$0.58

$0.56

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends paid, Per common share

$0.29

$0.29

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends declared and paid, Preference shares

'

'

$5,596,000

$7,483,000

$11,191,000

$13,758,000

'

$11,191,000

$13,758,000

'

'

'

'

'

'

'

'

'

'

'

Dividends declared and paid, Common shares

'

'

'

'

'

'

'

23,550,000

24,658,000

'

'

'

'

'

'

'

'

'

'

'

Common shares repurchased during period, Number of shares

'

'

'

'

'

'

'

'

'

'

3,400,000

'

'

'

'

'

'

'

'

'

Common shares repurchased during period, Aggregate amount

'

'

'

'

'

'

'

313,312,000

117,520,000

'

314,500,000

'

'

'

'

'

'

'

'

'

Common shares repurchased during period, Average cost per share

'

'

'

'

'

'

'

'

'

'

$93.53

'

'

'

'

'

'

'

'

'

Share repurchase program, Authorized aggregate amount

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

'

'

'

'

'

'

'

Share repurchase program, Remaining authorized aggregate amount

'

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

'

'

'

'

'

'

Preferred shares, Proceeds from issuance

'

'

'

'

'

'

'

'

'

'

'

'

250,000,000

'

'

'

300,000,000

275,000,000

0

265,655,000

Preferred shares, Shares issued

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

'

'

'

12,000,000

11,000,000

'

'

Preferred shares, Issued value per share

'

'

$1

'

$1

'

$1

'

'

'

'

'

$25

'

'

'

$25

$25

'

'

Preferred shares, Number of shares redeemed or called

'

'

'

'

'

'

'

'

'

'

'

5,000,000

'

'

6,000,000

6,000,000

'

'

'

'

Preferred shares, Redemption price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

$25

'

'

'

'

$25

'

Preferred shares, Dividend rate

'

'

'

'

'

'

'

'

'

'

'

'

'

6.08%

'

'

'

5.38%

'

'

Preferred shares, Redemption amount, shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,000,000

'

'

'

'

'

Preferred shares, Amount of preferred dividends in arrears, equivalent number of periods, trigger

'

'

6

'

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred shares, Preferred stock dividends in arrears, triggered shareholder election right, number of directors

'

'

2

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred shares, Redemption amount

'

'

'

'

'

'

'

'

'

'

'

$125,000,000

'

'

$150,000,000

$150,000,000

'

'

'

'

Preferred shares, Shares outstanding

'

'

16,000,000

'

16,000,000

'

16,000,000

'

'

'

'

5,000,000

'

'

0

6,000,000

'

'

'

'

Earnings_Per_Share_Computation

Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Numerator:	'		'		'		'
Net income available to RenaissanceRe common shareholders	$120,752		$26,806		$271,755		$217,280
Amount allocated to participating common shareholders	-1,557	[1]	-376	[1]	-3,577	[1]	-3,174	[1]
Net income allocated to RenaissanceRe common shareholders	$119,195		$26,430		$268,178		$214,106
Denominator:	'		'		'		'
Denominator for basic income per RenaissanceRe common share - weighted average common shares	39,736		43,372		40,487		43,453
Per common share equivalents of employee stock options and restricted shares	659		871		662		850
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	40,395		44,243		41,149		44,303
Net income available to RenaissanceRe common shareholders per common share – basic, in dollars per share	$3		$0.61		$6.62		$4.93
Net income available to RenaissanceRe common shareholders per common share – diluted, in dollars per share	$2.95		$0.60		$6.52		$4.83
[1]	Represents earnings attributable to holders of unvested restricted shares issued under the Company’s 2001 Stock Incentive Plan and Non-Employee Director Stock Incentive Plan.

Segment_Reporting_Schedule_Of_

Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) (USD $)	3 Months Ended			6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	$511,540	$703,223		$1,216,800	$1,338,641
Net premiums written	346,407	559,109		796,754	995,922
Net premiums earned	260,416	291,889		546,950	563,144
Net claims and claim expenses incurred	81,388	103,962		140,303	131,213
Acquisition expenses	33,477	31,767		67,177	56,776
Operational expenses	45,841	42,789		88,465	88,775
Underwriting income	99,710	113,371		251,005	286,380
Net investment income	34,541	26,163		73,489	69,365
Net foreign exchange gains (losses)	2,392	-932		1,331	-318
Equity in earnings of other ventures	7,232	3,772		11,431	9,607
Other loss	-535	-1,128		-473	-2,837
Net realized and unrealized gains on investments	27,128	-69,529		42,055	-55,260
Corporate expenses	-3,954	-21,529		-8,499	-26,011
Interest expense	-4,292	-4,300		-8,585	-9,334
Income from continuing operations before taxes	162,222	45,888		361,754	271,592
Income tax benefit (expense)	204	-11		38	-133
Income from discontinued operations	'	2,427		0	12,201
Net income attributable to noncontrolling interests	-36,078	-14,015		-78,846	-52,622
Dividends on preference shares	-5,596	-7,483		-11,191	-13,758
Net income available to RenaissanceRe common shareholders	120,752	26,806		271,755	217,280
Net claims and claim expenses incurred - current accident year	98,471	130,789		174,079	195,689
Net claims and claim expenses incurred – prior accident years	-17,083	-26,827		-33,776	-64,476
Net claims and claim expenses incurred	81,388	103,962		140,303	131,213
Net claims and claim expense ratio - current accident year	37.80%	44.80%		31.80%	34.70%
Net claims and claim expense ratio - prior accident years	-6.50%	-9.20%		-6.10%	-11.40%
Net claims and claim expense ratio - calendar year	31.30%	35.60%		25.70%	23.30%
Underwriting expense ratio	30.40%	25.60%		28.40%	25.90%
Combined ratio	61.70%	61.20%		54.10%	49.20%
Intersegment Eliminations	'	'		'	'
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	'	-1,000		'	-1,000
Catastrophe Reinsurance	'	'		'	'
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	388,083	576,903		855,794	1,055,699
Net premiums written	233,698	436,852		493,187	742,205
Net premiums earned	159,152	200,483		323,736	387,134
Net claims and claim expenses incurred	36,730	52,915		43,185	55,623
Acquisition expenses	17,806	14,197		24,932	23,817
Operational expenses	22,200	23,599		42,619	49,714
Underwriting income	82,416	109,772		213,000	257,980
Net claims and claim expenses incurred - current accident year	38,473	71,369		51,002	92,545
Net claims and claim expenses incurred – prior accident years	-1,743	-18,454		-7,817	-36,922
Net claims and claim expenses incurred	36,730	52,915		43,185	55,623
Net claims and claim expense ratio - current accident year	24.20%	35.60%		15.80%	23.90%
Net claims and claim expense ratio - prior accident years	-1.10%	-9.20%		-2.50%	-9.50%
Net claims and claim expense ratio - calendar year	23.10%	26.40%		13.30%	14.40%
Underwriting expense ratio	25.10%	18.80%		20.90%	19.00%
Combined ratio	48.20%	45.20%		34.20%	33.40%
Specialty Reinsurance	'	'		'	'
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	51,554	58,539		205,844	140,869
Net premiums written	46,254	57,348		171,743	132,867
Net premiums earned	53,588	49,206		123,218	96,015
Net claims and claim expenses incurred	20,075	25,511		46,156	36,203
Acquisition expenses	11,699	9,009		28,246	17,448
Operational expenses	10,514	7,595		20,620	15,155
Underwriting income	11,300	7,091		28,196	27,209
Net claims and claim expenses incurred - current accident year	25,443	30,903		67,365	56,756
Net claims and claim expenses incurred – prior accident years	-5,368	-5,392		-21,209	-20,553
Net claims and claim expenses incurred	20,075	25,511		46,156	36,203
Net claims and claim expense ratio - current accident year	47.50%	62.80%		54.70%	59.10%
Net claims and claim expense ratio - prior accident years	-10.00%	-11.00%		-17.20%	-21.40%
Net claims and claim expense ratio - calendar year	37.50%	51.80%		37.50%	37.70%
Underwriting expense ratio	41.40%	33.80%		39.60%	34.00%
Combined ratio	78.90%	85.60%		77.10%	71.70%
Lloyd's	'	'		'	'
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	71,903	68,769		155,162	143,061
Net premiums written	66,452	64,643		131,821	120,567
Net premiums earned	47,672	41,933		99,969	79,712
Net claims and claim expenses incurred	25,111	25,536		51,392	40,064
Acquisition expenses	10,122	8,484		20,689	15,400
Operational expenses	13,058	11,456		25,091	23,634
Underwriting income	-619	-3,543		2,797	614
Net claims and claim expenses incurred - current accident year	34,555	28,517		55,712	46,388
Net claims and claim expenses incurred – prior accident years	-9,444	-2,981		-4,320	-6,324
Net claims and claim expenses incurred	25,111	25,536		51,392	40,064
Net claims and claim expense ratio - current accident year	72.50%	68.00%		55.70%	58.20%
Net claims and claim expense ratio - prior accident years	-19.80%	-7.10%		-4.30%	-7.90%
Net claims and claim expense ratio - calendar year	52.70%	60.90%		51.40%	50.30%
Underwriting expense ratio	48.60%	47.50%		45.80%	48.90%
Combined ratio	101.30%	108.40%		97.20%	99.20%
Other	'	'		'	'
Segment Reporting Information [Line Items]	'	'		'	'
Gross premiums written	0	-988	[1]	0	-988	[1]
Net premiums written	3	266		3	283
Net premiums earned	4	267		27	283
Net claims and claim expenses incurred	-528	0		-430	-677
Acquisition expenses	-6,150	77		-6,690	111
Operational expenses	69	139		135	272
Underwriting income	6,613	51		7,012	577
Net investment income	34,541	26,163		73,489	69,365
Net foreign exchange gains (losses)	2,392	-932		1,331	-318
Equity in earnings of other ventures	7,232	3,772		11,431	9,607
Other loss	-535	-1,128		-473	-2,837
Net realized and unrealized gains on investments	27,128	-69,529		42,055	-55,260
Corporate expenses	-3,954	-21,529		-8,499	-26,011
Interest expense	-4,292	-4,300		-8,585	-9,334
Income tax benefit (expense)	204	-11		38	-133
Income from discontinued operations	'	2,427		'	12,201
Net income attributable to noncontrolling interests	-36,078	-14,015		-78,846	-52,622
Dividends on preference shares	-5,596	-7,483		-11,191	-13,758
Net claims and claim expenses incurred - current accident year	0	0		0	0
Net claims and claim expenses incurred – prior accident years	-528	0		-430	-677
Net claims and claim expenses incurred	($528)	$0		($430)	($677)
Net claims and claim expense ratio - current accident year	0.00%	0.00%		0.00%	0.00%
Net claims and claim expense ratio - prior accident years	-13200.00%	0.00%		-1592.60%	-239.20%
Net claims and claim expense ratio - calendar year	-13200.00%	0.00%		-1592.60%	-239.20%
Underwriting expense ratio	-152025.00%	80.90%		-24277.80%	135.30%
Combined ratio	-165225.00%	80.90%		-25870.40%	-103.90%
[1]	Included in gross premiums written in the Other category is the elimination of inter-segment gross premiums written of $1.0 million.

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'
Derivative Asset	$9,946,000	$10,667,000
Interest Rate Contracts | Long	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	523,500,000	1,169,300,000
Interest Rate Contracts | Short	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	667,400,000	356,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	163,600,000	263,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	235,500,000	139,800,000
Foreign Currency Forward Contracts, Investment Operations | Long	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	41,600,000	39,600,000
Foreign Currency Forward Contracts, Investment Operations | Short	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	153,100,000	159,100,000
Credit Default Swaps | Long	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	5,000,000	7,100,000
Credit Default Swaps | Short	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	25,100,000	18,400,000
Weather Contract | Short	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	6,700,000	6,400,000
Call Rights	'	'
Derivative [Line Items]	'	'
Derivative Asset	$2,200,000	'

Derivative_Instruments_Consoli

Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Assets	'		'
Gross Amounts of Recognized Assets	$14,153		$12,328
Gross Amounts Offset in the Balance Sheet	4,207		1,661
Net Amounts of Assets Presented in the Balance Sheet	9,946		10,667
Collateral	570		310
Net Amount	9,376		10,357
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	3,915		6,419
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	460		510
Net Amounts of Liabilities Presented in the Balance Sheet	3,455		5,909
Collateral	331		12
Net Amount	3,124		5,897
Call Rights	'		'
Derivative Assets	'		'
Net Amounts of Assets Presented in the Balance Sheet	2,200		'
Other Assets | Interest Rate Contracts	'		'
Derivative Assets	'		'
Gross Amounts of Recognized Assets	190		897
Gross Amounts Offset in the Balance Sheet	189		62
Net Amounts of Assets Presented in the Balance Sheet	1		835
Collateral	0		0
Net Amount	1		835
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations	'		'
Derivative Assets	'		'
Gross Amounts of Recognized Assets	10,764	[1]	9,612	[1]
Gross Amounts Offset in the Balance Sheet	3,747	[1]	1,179	[1]
Net Amounts of Assets Presented in the Balance Sheet	7,017	[1]	8,433	[1]
Collateral	0	[1]	0	[1]
Net Amount	7,017	[1]	8,433	[1]
Other Assets | Foreign Currency Forward Contracts, Investment Operations	'		'
Derivative Assets	'		'
Gross Amounts of Recognized Assets	249	[2]	1,013	[2]
Gross Amounts Offset in the Balance Sheet	238	[2]	338	[2]
Net Amounts of Assets Presented in the Balance Sheet	11	[2]	675	[2]
Collateral	0	[2]	0	[2]
Net Amount	11	[2]	675	[2]
Other Assets | Credit Default Swaps	'		'
Derivative Assets	'		'
Gross Amounts of Recognized Assets	730		806
Gross Amounts Offset in the Balance Sheet	33		82
Net Amounts of Assets Presented in the Balance Sheet	697		724
Collateral	570		310
Net Amount	127		414
Other Assets | Call Rights	'		'
Derivative Assets	'		'
Gross Amounts of Recognized Assets	2,220		'
Gross Amounts Offset in the Balance Sheet	0		'
Net Amounts of Assets Presented in the Balance Sheet	2,220		'
Collateral	0		'
Net Amount	2,220		'
Other Liabilities | Interest Rate Contracts	'		'
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	530		74
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	189		62
Net Amounts of Liabilities Presented in the Balance Sheet	341		12
Collateral	331		12
Net Amount	10		0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations	'		'
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	1,042	[1]	2,204	[1]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	[1]	28	[1]
Net Amounts of Liabilities Presented in the Balance Sheet	1,042	[1]	2,176	[1]
Collateral	0	[1]	0	[1]
Net Amount	1,042	[1]	2,176	[1]
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations	'		'
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	1,151	[2]	1,557	[2]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	238	[2]	338	[2]
Net Amounts of Liabilities Presented in the Balance Sheet	913	[2]	1,219	[2]
Collateral	0	[2]	0	[2]
Net Amount	913	[2]	1,219	[2]
Other Liabilities | Credit Default Swaps	'		'
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	43		94
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	33		82
Net Amounts of Liabilities Presented in the Balance Sheet	10		12
Collateral	0		0
Net Amount	10		12
Other Liabilities | Weather Contract	'		'
Derivative Liabilities	'		'
Gross Amounts of Recognized Liabilities	1,149		2,490
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	1,149		2,490
Collateral	0		0
Net Amount	$1,149		$2,490
[1]	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
[2]	Contracts used to manage foreign currency risks in investment operations.

Derivative_Instruments_Gain_Lo

Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	($6,596)		$6,899		($14,795)		$11,401
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	-1,990	[1]	-13,264	[1]	2,109	[1]	-10,876	[1]
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Investment Operations	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	58	[2]	-332	[2]	-1,341	[2]	1,346	[2]
Net realized and unrealized gains (losses) on investments | Interest Rate Contracts	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	-7,362		20,203		-19,636		20,205
Net realized and unrealized gains (losses) on investments | Credit Default Swaps	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	299		292		458		726
Net realized and unrealized gains (losses) on investments | Weather Contract	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	179		0		1,395		0
Other loss | Call Rights	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amount of gain (loss) recognized on derivatives	$2,220		$0		$2,220		$0
[1]	Contracts used to manage foreign currency risks in underwriting and non-investment operations.
[2]	Contracts used to manage foreign currency risks in investment operations.

Commitments_Contingencies_and_1

Commitments, Contingencies and Other Items (Syndicated Letter of Credit Facility) (Details) (Letter of Credit, Reimbursement Agreement, USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Letter of Credit | Reimbursement Agreement	'	'	'
Line of Credit Facility [Line Items]	'	'	'
Line of Credit Facility, Current Borrowing Capacity	$100,000,000	$180,000,000	$250,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$450,000,000	'	'

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Narrative) (Details) (RenRe North America Holdings Inc., USD $)	0 Months Ended	3 Months Ended
	Mar. 17, 2010	Mar. 31, 2010	Jun. 30, 2014
Debt Instrument [Line Items]	'	'	'
Subsidiary, ownership percentage	'	'	100.00%
5.75% Senior Notes Due March 15, 2020	'	'	'
Debt Instrument [Line Items]	'	'	'
Senior notes issuance date	17-Mar-10	'	'
5.75% Senior notes issued	$250,000,000	'	'
Senior notes interest rate	'	'	5.75%
Senior notes maturity date	'	'March 15, 2020	'

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'		'		'		'
Total investments	$6,706,902		$6,821,712		'		'
Cash and cash equivalents	294,457		408,032		234,906		304,145
Investments in subsidiaries	0		0		'		'
Due from subsidiaries and affiliates	0		0		'		'
Premiums receivable	837,116		474,087		'		'
Prepaid reinsurance premiums	267,963		66,132		'		'
Reinsurance recoverable	85,115		101,025		'		'
Accrued investment income	28,019		34,065		'		'
Deferred acquisition costs	140,765		81,684		'		'
Receivable for investments sold	58,205		75,845		'		'
Other assets	97,083		116,549		'		'
Total assets	8,515,625		8,179,131		'		'
Liabilities	'		'		'		'
Reserve for claims and claim expenses	1,552,618		1,563,730		'		'
Unearned premiums	929,523		477,888		'		'
Debt	249,476		249,430		'		'
Amounts due to subsidiaries and affiliates	0		0		'		'
Reinsurance balances payable	558,185		293,022		'		'
Payable for investments purchased	201,340		193,221		'		'
Other liabilities	164,650		397,596		'		'
Total liabilities	3,655,792		3,174,887		'		'
Redeemable noncontrolling interests	1,023,892		1,099,860		'		'
Shareholders' Equity	'		'		'		'
Total shareholders’ equity	3,835,941		3,904,384		3,571,990		'
Total liabilities, noncontrolling interests and shareholders’ equity	8,515,625		8,179,131		'		'
RenaissanceRe Holdings Ltd. (Parent Guarantor)	'		'		'		'
Assets	'		'		'		'
Total investments	168,982		210,719		'		'
Cash and cash equivalents	3,194		8,796		1,636		6,298
Investments in subsidiaries	3,473,208		3,294,729		'		'
Due from subsidiaries and affiliates	141,812		296,752		'		'
Premiums receivable	0		0		'		'
Prepaid reinsurance premiums	0		0		'		'
Reinsurance recoverable	0		0		'		'
Accrued investment income	179		0		'		'
Deferred acquisition costs	0		0		'		'
Receivable for investments sold	8		14		'		'
Other assets	113,130		112,234		'		'
Total assets	3,900,513		3,923,244		'		'
Liabilities	'		'		'		'
Reserve for claims and claim expenses	0		0		'		'
Unearned premiums	0		0		'		'
Debt	0		0		'		'
Amounts due to subsidiaries and affiliates	53,698		0		'		'
Reinsurance balances payable	0		0		'		'
Payable for investments purchased	0		0		'		'
Other liabilities	10,874		18,860		'		'
Total liabilities	64,572		18,860		'		'
Redeemable noncontrolling interests	0		0		'		'
Shareholders' Equity	'		'		'		'
Total shareholders’ equity	3,835,941		3,904,384		'		'
Total liabilities, noncontrolling interests and shareholders’ equity	3,900,513		3,923,244		'		'
RenRe North America Holdings Inc.	'		'		'		'
Assets	'		'		'		'
Total investments	98,580		98,784		'		'
Cash and cash equivalents	3,211		4,027		4,254		1,528
Investments in subsidiaries	72,077		74,718		'		'
Due from subsidiaries and affiliates	24		0		'		'
Premiums receivable	0		0		'		'
Prepaid reinsurance premiums	0		0		'		'
Reinsurance recoverable	0		0		'		'
Accrued investment income	124		110		'		'
Deferred acquisition costs	0		0		'		'
Receivable for investments sold	4		0		'		'
Other assets	1,362		1,481		'		'
Total assets	175,382		179,120		'		'
Liabilities	'		'		'		'
Reserve for claims and claim expenses	0		0		'		'
Unearned premiums	0		0		'		'
Debt	249,476		249,430		'		'
Amounts due to subsidiaries and affiliates	2,420		3,173		'		'
Reinsurance balances payable	0		0		'		'
Payable for investments purchased	73		0		'		'
Other liabilities	7,495		6,953		'		'
Total liabilities	259,464		259,556		'		'
Redeemable noncontrolling interests	0		0		'		'
Shareholders' Equity	'		'		'		'
Total shareholders’ equity	-84,082		-80,436		'		'
Total liabilities, noncontrolling interests and shareholders’ equity	175,382		179,120		'		'
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)	'		'		'		'
Assets	'		'		'		'
Total investments	6,439,340	[1]	6,512,209	[1]	'		'
Cash and cash equivalents	288,052	[1]	395,209	[1]	229,016	[1]	296,319	[1]
Investments in subsidiaries	0	[1]	0	[1]	'		'
Due from subsidiaries and affiliates	0	[1]	0	[1]	'		'
Premiums receivable	837,116	[1]	474,087	[1]	'		'
Prepaid reinsurance premiums	267,963	[1]	66,132	[1]	'		'
Reinsurance recoverable	85,115	[1]	101,025	[1]	'		'
Accrued investment income	27,716	[1]	33,955	[1]	'		'
Deferred acquisition costs	140,765	[1]	81,684	[1]	'		'
Receivable for investments sold	58,193	[1]	75,831	[1]	'		'
Other assets	84,049	[1]	102,834	[1]	'		'
Total assets	8,228,309	[1]	7,842,966	[1]	'		'
Liabilities	'		'		'		'
Reserve for claims and claim expenses	1,552,618	[1]	1,563,730	[1]	'		'
Unearned premiums	929,523	[1]	477,888	[1]	'		'
Debt	0	[1]	0	[1]	'		'
Amounts due to subsidiaries and affiliates	0	[1]	0	[1]	'		'
Reinsurance balances payable	558,185	[1]	293,022	[1]	'		'
Payable for investments purchased	201,267	[1]	193,221	[1]	'		'
Other liabilities	147,739	[1]	371,783	[1]	'		'
Total liabilities	3,389,332	[1]	2,899,644	[1]	'		'
Redeemable noncontrolling interests	1,023,892	[1]	1,099,860	[1]	'		'
Shareholders' Equity	'		'		'		'
Total shareholders’ equity	3,815,085	[1]	3,843,462	[1]	'		'
Total liabilities, noncontrolling interests and shareholders’ equity	8,228,309	[1]	7,842,966	[1]	'		'
Consolidating Adjustments	'		'		'		'
Assets	'		'		'		'
Total investments	0	[2]	0	[2]	'		'
Cash and cash equivalents	0	[2]	0	[2]	'		'
Investments in subsidiaries	-3,545,285	[2]	-3,369,447	[2]	'		'
Due from subsidiaries and affiliates	-141,836	[2]	-296,752	[2]	'		'
Premiums receivable	0	[2]	0	[2]	'		'
Prepaid reinsurance premiums	0	[2]	0	[2]	'		'
Reinsurance recoverable	0	[2]	0	[2]	'		'
Accrued investment income	0	[2]	0	[2]	'		'
Deferred acquisition costs	0	[2]	0	[2]	'		'
Receivable for investments sold	0	[2]	0	[2]	'		'
Other assets	-101,458	[2]	-100,000	[2]	'		'
Total assets	-3,788,579	[2]	-3,766,199	[2]	'		'
Liabilities	'		'		'		'
Reserve for claims and claim expenses	0	[2]	0	[2]	'		'
Unearned premiums	0	[2]	0	[2]	'		'
Debt	0	[2]	0	[2]	'		'
Amounts due to subsidiaries and affiliates	-56,118	[2]	-3,173	[2]	'		'
Reinsurance balances payable	0	[2]	0	[2]	'		'
Payable for investments purchased	0	[2]	0	[2]	'		'
Other liabilities	-1,458	[2]	0	[2]	'		'
Total liabilities	-57,576	[2]	-3,173	[2]	'		'
Redeemable noncontrolling interests	0	[2]	0	[2]	'		'
Shareholders' Equity	'		'		'		'
Total shareholders’ equity	-3,731,003	[2]	-3,763,026	[2]	'		'
Total liabilities, noncontrolling interests and shareholders’ equity	($3,788,579)	[2]	($3,766,199)	[2]	'		'
[1]	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
[2]	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Revenues	'		'		'		'
Net premiums earned	$260,416		$291,889		$546,950		$563,144
Net investment income	34,541		26,163		73,489		69,365
Net foreign exchange gains (losses)	2,392		-932		1,331		-318
Equity in earnings of other ventures	7,232		3,772		11,431		9,607
Other loss	-535		-1,128		-473		-2,837
Net realized and unrealized gains on investments	27,128		-69,529		42,055		-55,260
Total revenues	331,174		250,235		674,783		583,701
Expenses	'		'		'		'
Net claims and claim expenses incurred	81,388		103,962		140,303		131,213
Acquisition expenses	33,477		31,767		67,177		56,776
Operational expenses	45,841		42,789		88,465		88,775
Corporate expenses	3,954		21,529		8,499		26,011
Interest expense	4,292		4,300		8,585		9,334
Total expenses	168,952		204,347		313,029		312,109
(Loss) income before equity in net income (loss) of subsidiaries and taxes	162,222		45,888		361,754		271,592
Equity in net income (loss) of subsidiaries	0		0		0		0
Income from continuing operations before taxes	162,222		45,888		361,754		271,592
Income tax benefit (expense)	204		-11		38		-133
Income from continuing operations	162,426		45,877		361,792		271,459
Income from discontinued operations	'		2,427		0		12,201
Net income	162,426		48,304		361,792		283,660
Net income attributable to noncontrolling interests	-36,078		-14,015		-78,846		-52,622
Net income (loss) attributable to RenaissanceRe	126,348		34,289		282,946		231,038
Dividends on preference shares	-5,596		-7,483		-11,191		-13,758
Net income available to RenaissanceRe common shareholders	120,752		26,806		271,755		217,280
RenaissanceRe Holdings Ltd. (Parent Guarantor)	'		'		'		'
Revenues	'		'		'		'
Net premiums earned	0		0		0		0
Net investment income	736		668		1,361		2,218
Net foreign exchange gains (losses)	6		0		7		-50
Equity in earnings of other ventures	0		0		0		0
Other loss	0		0		0		106
Net realized and unrealized gains on investments	190		-158		84		-1,444
Total revenues	932		510		1,452		830
Expenses	'		'		'		'
Net claims and claim expenses incurred	0		0		0		0
Acquisition expenses	0		0		0		0
Operational expenses	-1,236		-1,241		-2,116		-2,463
Corporate expenses	3,468		21,007		7,470		24,909
Interest expense	0		0		0		734
Total expenses	2,232		19,766		5,354		23,180
(Loss) income before equity in net income (loss) of subsidiaries and taxes	-1,300		-19,256		-3,902		-22,350
Equity in net income (loss) of subsidiaries	127,648		53,545		286,848		253,388
Income from continuing operations before taxes	126,348		34,289		282,946		231,038
Income tax benefit (expense)	0		0		0		0
Income from continuing operations	'		34,289		'		231,038
Income from discontinued operations	'		0		'		0
Net income	126,348		34,289		282,946		231,038
Net income attributable to noncontrolling interests	0		0		0		0
Net income (loss) attributable to RenaissanceRe	126,348		34,289		282,946		231,038
Dividends on preference shares	-5,596		-7,483		-11,191		-13,758
Net income available to RenaissanceRe common shareholders	120,752		26,806		271,755		217,280
RenRe North America Holdings Inc. (Subsidiary Issuer)	'		'		'		'
Revenues	'		'		'		'
Net premiums earned	0		0		0		0
Net investment income	445		37		919		236
Net foreign exchange gains (losses)	0		-2		0		-2
Equity in earnings of other ventures	0		0		0		0
Other loss	0		0		-8		0
Net realized and unrealized gains on investments	4,340		-145		4,717		-114
Total revenues	4,785		-110		5,628		120
Expenses	'		'		'		'
Net claims and claim expenses incurred	0		0		0		0
Acquisition expenses	0		0		0		0
Operational expenses	1,684		1,568		3,578		4,017
Corporate expenses	59		59		118		118
Interest expense	3,616		3,616		7,233		7,233
Total expenses	5,359		5,243		10,929		11,368
(Loss) income before equity in net income (loss) of subsidiaries and taxes	-574		-5,353		-5,301		-11,248
Equity in net income (loss) of subsidiaries	-38		-4,197		815		-3,838
Income from continuing operations before taxes	-612		-9,550		-4,486		-15,086
Income tax benefit (expense)	-38		-313		646		-5
Income from continuing operations	'		-9,863		'		-15,091
Income from discontinued operations	'		2,427		'		12,201
Net income	-650		-7,436		-3,840		-2,890
Net income attributable to noncontrolling interests	0		0		0		0
Net income (loss) attributable to RenaissanceRe	-650		-7,436		-3,840		-2,890
Dividends on preference shares	0		0		0		0
Net income available to RenaissanceRe common shareholders	-650		-7,436		-3,840		-2,890
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)	'		'		'		'
Revenues	'		'		'		'
Net premiums earned	260,416	[1]	291,889	[1]	546,950	[1]	563,144	[1]
Net investment income	34,293	[1]	26,403	[1]	73,079	[1]	68,808	[1]
Net foreign exchange gains (losses)	2,386	[1]	-930	[1]	1,324	[1]	-266	[1]
Equity in earnings of other ventures	7,232	[1]	3,772	[1]	11,431	[1]	9,607	[1]
Other loss	-535	[1]	-1,128	[1]	-465	[1]	-2,943	[1]
Net realized and unrealized gains on investments	22,598	[1]	-69,226	[1]	37,254	[1]	-53,702	[1]
Total revenues	326,390	[1]	250,780	[1]	669,573	[1]	584,648	[1]
Expenses	'		'		'		'
Net claims and claim expenses incurred	81,388	[1]	103,962	[1]	140,303	[1]	131,213	[1]
Acquisition expenses	33,477	[1]	31,767	[1]	67,177	[1]	56,776	[1]
Operational expenses	45,483	[1]	42,314	[1]	87,171	[1]	87,221	[1]
Corporate expenses	427	[1]	463	[1]	911	[1]	984	[1]
Interest expense	676	[1]	684	[1]	1,352	[1]	1,367	[1]
Total expenses	161,451	[1]	179,190	[1]	296,914	[1]	277,561	[1]
(Loss) income before equity in net income (loss) of subsidiaries and taxes	164,939	[1]	71,590	[1]	372,659	[1]	307,087	[1]
Equity in net income (loss) of subsidiaries	0	[1]	0	[1]	0	[1]	0	[1]
Income from continuing operations before taxes	164,939	[1]	71,590	[1]	372,659	[1]	307,087	[1]
Income tax benefit (expense)	242	[1]	302	[1]	-608	[1]	-128	[1]
Income from continuing operations	'		71,892	[1]	'		306,959	[1]
Income from discontinued operations	'		0	[1]	'		0	[1]
Net income	165,181	[1]	71,892	[1]	372,051	[1]	306,960	[1]
Net income attributable to noncontrolling interests	-36,078	[1]	-14,015	[1]	-78,846	[1]	-52,622	[1]
Net income (loss) attributable to RenaissanceRe	129,103	[1]	57,877	[1]	293,205	[1]	254,338	[1]
Dividends on preference shares	0	[1]	0	[1]	0	[1]	0	[1]
Net income available to RenaissanceRe common shareholders	129,103	[1]	57,877	[1]	293,205	[1]	254,338	[1]
Consolidating Adjustments	'		'		'		'
Revenues	'		'		'		'
Net premiums earned	0	[2]	0	[2]	0	[2]	0	[2]
Net investment income	-933	[2]	-945	[2]	-1,870	[2]	-1,897	[2]
Net foreign exchange gains (losses)	0	[2]	0	[2]	0	[2]	0	[2]
Equity in earnings of other ventures	0	[2]	0	[2]	0	[2]	0	[2]
Other loss	0	[2]	0	[2]	0	[2]	0	[2]
Net realized and unrealized gains on investments	0	[2]	0	[2]	0	[2]	0	[2]
Total revenues	-933	[2]	-945	[2]	-1,870	[2]	-1,897	[2]
Expenses	'		'		'		'
Net claims and claim expenses incurred	0	[2]	0	[2]	0	[2]	0	[2]
Acquisition expenses	0	[2]	0	[2]	0	[2]	0	[2]
Operational expenses	-90	[2]	148	[2]	-168	[2]	0	[2]
Corporate expenses	0	[2]	0	[2]	0	[2]	0	[2]
Interest expense	0	[2]	0	[2]	0	[2]	0	[2]
Total expenses	-90	[2]	148	[2]	-168	[2]	0	[2]
(Loss) income before equity in net income (loss) of subsidiaries and taxes	-843	[2]	-1,093	[2]	-1,702	[2]	-1,897	[2]
Equity in net income (loss) of subsidiaries	-127,610	[2]	-49,348	[2]	-287,663	[2]	-249,550	[2]
Income from continuing operations before taxes	-128,453	[2]	-50,441	[2]	-289,365	[2]	-251,447	[2]
Income tax benefit (expense)	0	[2]	0	[2]	0	[2]	0	[2]
Income from continuing operations	'		-50,441	[2]	'		-251,447	[2]
Income from discontinued operations	'		0	[2]	'		0	[2]
Net income	-128,453	[2]	-50,441	[2]	-289,365	[2]	-251,448	[2]
Net income attributable to noncontrolling interests	0	[2]	0	[2]	0	[2]	0	[2]
Net income (loss) attributable to RenaissanceRe	-128,453	[2]	-50,441	[2]	-289,365	[2]	-251,448	[2]
Dividends on preference shares	0	[2]	0	[2]	0	[2]	0	[2]
Net income available to RenaissanceRe common shareholders	($128,453)	[2]	($50,441)	[2]	($289,365)	[2]	($251,448)	[2]
[1]	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
[2]	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.

Condensed_Consolidating_Financ5

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]	'		'		'		'
Net income	$162,426		$48,304		$361,792		$283,660
Change in net unrealized gains on investments	-45		-1,141		-213		-8,713
Portion of other-than-temporary impairments recognized in other comprehensive income	'		'		0		0
Comprehensive income	162,381		47,163		361,579		274,947
Net income attributable to noncontrolling interests	-36,078		-14,015		-78,846		-52,622
Comprehensive income attributable to noncontrolling interests	-36,078		-14,015		-78,846		-52,622
Comprehensive income attributable to RenaissanceRe	126,303		33,148		282,733		222,325
RenaissanceRe Holdings Ltd. (Parent Guarantor)	'		'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'		'
Net income	126,348		34,289		282,946		231,038
Change in net unrealized gains on investments	0		0		0		0
Comprehensive income	126,348		34,289		282,946		231,038
Net income attributable to noncontrolling interests	0		0		0		0
Comprehensive income attributable to noncontrolling interests	0		0		0		0
Comprehensive income attributable to RenaissanceRe	126,348		34,289		282,946		231,038
RenRe North America Holdings Inc. (Subsidiary Issuer)	'		'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'		'
Net income	-650		-7,436		-3,840		-2,890
Change in net unrealized gains on investments	0		0		0		0
Comprehensive income	-650		-7,436		-3,840		-2,890
Net income attributable to noncontrolling interests	0		0		0		0
Comprehensive income attributable to noncontrolling interests	0		0		0		0
Comprehensive income attributable to RenaissanceRe	-650		-7,436		-3,840		-2,890
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)	'		'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'		'
Net income	165,181	[1]	71,892	[1]	372,051	[1]	306,960	[1]
Change in net unrealized gains on investments	-45	[1]	-1,141	[1]	-213	[1]	-8,713	[1]
Comprehensive income	165,136	[1]	70,751	[1]	371,838	[1]	298,247	[1]
Net income attributable to noncontrolling interests	-36,078	[1]	-14,015	[1]	-78,846	[1]	-52,622	[1]
Comprehensive income attributable to noncontrolling interests	-36,078	[1]	-14,015	[1]	-78,846	[1]	-52,622	[1]
Comprehensive income attributable to RenaissanceRe	129,058	[1]	56,736	[1]	292,992	[1]	245,625	[1]
Consolidating Adjustments	'		'		'		'
Condensed Financial Statements, Captions [Line Items]	'		'		'		'
Net income	-128,453	[2]	-50,441	[2]	-289,365	[2]	-251,448	[2]
Change in net unrealized gains on investments	0	[2]	0	[2]	0	[2]	0	[2]
Comprehensive income	-128,453	[2]	-50,441	[2]	-289,365	[2]	-251,448	[2]
Net income attributable to noncontrolling interests	0	[2]	0	[2]	0	[2]	0	[2]
Comprehensive income attributable to noncontrolling interests	0	[2]	0	[2]	0	[2]	0	[2]
Comprehensive income attributable to RenaissanceRe	($128,453)	[2]	($50,441)	[2]	($289,365)	[2]	($251,448)	[2]
[1]	Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.
[2]	Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.

Condensed_Consolidating_Financ6

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) (USD $)

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

RenaissanceRe Holdings Ltd. (Parent Guarantor)

RenaissanceRe Holdings Ltd. (Parent Guarantor)

RenRe North America Holdings Inc. (Subsidiary Issuer)

RenRe North America Holdings Inc. (Subsidiary Issuer)

Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)

Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)

Series C Preferred Stock

Series C Preferred Stock

Series C Preferred Stock

Series C Preferred Stock

Series C Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series D Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

Series E Preferred Stock

RenaissanceRe Holdings Ltd. (Parent Guarantor)

RenRe North America Holdings Inc. (Subsidiary Issuer)

Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)

RenaissanceRe Holdings Ltd. (Parent Guarantor)

RenRe North America Holdings Inc. (Subsidiary Issuer)

Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)

RenaissanceRe Holdings Ltd. (Parent Guarantor)

RenRe North America Holdings Inc. (Subsidiary Issuer)

Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)

Cash flows (used in) provided by operating activities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash (used in) provided by operating activities

$173,386,000

$177,419,000

($14,828,000)

($42,805,000)

($8,410,000)

($20,926,000)

$196,624,000

[1]

$241,150,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash flows provided by investing activities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from sales and maturities of fixed maturity investments trading

4,020,174,000

4,448,449,000

4,912,000

409,514,000

5,353,000

64,535,000

4,009,909,000

[1]

3,974,400,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchases of fixed maturity investments trading

-3,970,317,000

-4,225,188,000

-79,714,000

-20,604,000

0

-43,799,000

-3,890,603,000

[1]

-4,160,785,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from sales and maturities of fixed maturity investments available for sale

5,114,000

41,338,000

0

0

0

0

5,114,000

[1]

41,338,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net purchases of equity investments trading

-11,146,000

-35,958,000

0

0

-370,000

0

-10,776,000

[1]

-35,958,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales (purchases) of short term investments

89,549,000

-110,562,000

116,511,000

98,000,000

-68,000

10,396,000

-26,894,000

[1]

-218,958,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales of other investments

68,684,000

42,935,000

0

0

0

0

68,684,000

[1]

42,935,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales (purchases) of investments in other ventures

1,030,000

-2,500,000

0

0

0

0

1,030,000

[1]

-2,500,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net sales of other assets

6,000,000

598,000

0

0

0

0

6,000,000

598,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends and return of capital from subsidiaries

0

0

359,891,000

128,922,000

5,406,000

4,806,000

-365,297,000

[1]

-133,728,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contributions to subsidiaries

0

0

-47,220,000

-296,179,000

-1,950,000

-12,625,000

49,170,000

[1]

308,804,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Due to (from) subsidiary

0

0

4,123,000

-11,753,000

-777,000

339,000

-3,346,000

[1]

11,414,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash provided by investing activities

209,088,000

159,112,000

358,503,000

307,900,000

7,594,000

23,652,000

-157,009,000

[1]

-172,440,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash flows provided by (used in) financing activities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends paid – RenaissanceRe common shares

-23,550,000

-24,658,000

-23,550,000

-24,658,000

0

0

0

[1]

0

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends paid – preference shares

-11,191,000

-13,758,000

-11,191,000

-13,758,000

0

0

0

[1]

0

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

RenaissanceRe common share repurchases

-314,536,000

-121,996,000

-314,536,000

-121,996,000

0

0

0

[1]

0

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (repayment) drawdown of debt

0

-101,410,000

'

-100,000,000

'

0

'

-1,410,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption of preference stock

'

'

'

'

'

'

'

'

0

-125,000,000

-125,000,000

0

0

[1]

0

-150,000,000

-150,000,000

0

0

[1]

'

'

'

'

'

Issuance of 5.375% Series E preference shares, net of expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

265,655,000

265,655,000

0

0

[1]

Net third party redeemable noncontrolling interest share transactions

-144,096,000

-105,633,000

0

0

0

0

-144,096,000

[1]

-105,633,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net cash used in financing activities

-493,373,000

-376,800,000

-349,277,000

-269,757,000

0

0

-144,096,000

[1]

-107,043,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effect of exchange rate changes on foreign currency cash

-2,676,000

505,000

0

0

0

0

-2,676,000

[1]

505,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (decrease) increase in cash and cash equivalents

-113,575,000

-39,764,000

-5,602,000

-4,662,000

-816,000

2,726,000

-107,157,000

[1]

-37,828,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net increase in cash and cash equivalents of discontinued operations

0

-29,475,000

'

0

'

0

'

-29,475,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents, beginning of period

408,032,000

304,145,000

8,796,000

6,298,000

4,027,000

1,528,000

395,209,000

[1]

296,319,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents, end of period

$294,457,000

$234,906,000

$3,194,000

$1,636,000

$3,211,000

$4,254,000

$288,052,000

[1]

$229,016,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Subsequent_Events_Details

Subsequent Events (Details) (DaVinciRe, USD $)	Jun. 30, 2014	Jan. 03, 2014	Dec. 31, 2013	Jan. 02, 2013	Dec. 31, 2012	Sep. 30, 2013	Jul. 02, 2014	Jul. 02, 2014
In Millions, unless otherwise specified						Redeemable Noncontrolling Interest	Subsequent Event	Subsequent Event
								Redeemable Noncontrolling Interest
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'
Issuance of equity to third party investors	'	'	'	'	'	$77.40	'	$38.90
Parent company ownership in redeemable noncontrolling interest	26.50%	26.50%	27.30%	32.90%	30.80%	'	23.40%	'