RenaissanceRe (RNR) 10-Q 26 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 21, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	RENAISSANCERE HOLDINGS LTD.
Trading Symbol	RNR
Entity Central Index Key	913,144
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		40,265,190

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Fixed maturity investments trading, at fair value – amortized cost $7,257,020 at June 30, 2017 (December 31, 2016 – $6,920,690)	$ 7,282,264	$ 6,891,244
Short term investments, at fair value	1,070,950	1,368,379
Equity investments trading, at fair value	393,405	383,313
Other investments, at fair value	561,212	549,805
Investments in other ventures, under equity method	101,077	124,227
Total investments	9,408,908	9,316,968
Cash and cash equivalents	623,150	421,157
Premiums receivable	1,533,833	987,323
Prepaid reinsurance premiums	705,322	441,260
Reinsurance recoverable	370,586	279,564
Accrued investment income	40,118	38,076
Deferred acquisition costs	430,106	335,325
Receivable for investments sold	170,411	105,841
Other assets	176,816	175,382
Goodwill and other intangible assets	246,430	251,186
Total assets	13,705,680	12,352,082
Liabilities
Reserve for claims and claim expenses	2,989,806	2,848,294
Unearned premiums	1,847,206	1,231,573
Debt	988,866	948,663
Reinsurance balances payable	1,052,494	673,983
Payable for investments purchased	407,312	305,714
Other liabilities	222,658	301,684
Total liabilities	7,508,342	6,309,911
Commitments and Contingencies
Redeemable noncontrolling interests	1,242,083	1,175,594
Shareholders’ Equity
Preference shares: $1.00 par value – 16,000,000 shares issued and outstanding at June 30, 2017 (December 31, 2016 – 16,000,000)	400,000	400,000
Common shares: $1.00 par value – 40,282,418 shares issued and outstanding at June 30, 2017 (December 31, 2016 – 41,187,413)	40,282	41,187
Additional paid-in capital	67,583	216,558
Accumulated other comprehensive (loss) income	(139)	1,133
Retained earnings	4,447,529	4,207,699
Total shareholders’ equity attributable to RenaissanceRe	4,955,255	4,866,577
Total liabilities, noncontrolling interests and shareholders’ equity	$ 13,705,680	$ 12,352,082

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 7,257,020	$ 6,920,690
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)	40,282,418	41,187,413
Common shares, Shares outstanding (In shares)	40,282,418	41,187,413

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Gross premiums written	$ 827,415	$ 759,128	$ 1,749,505	$ 1,621,261
Net premiums written	555,745	519,916	1,099,881	1,031,591
Increase in unearned premiums	(173,480)	(168,514)	(351,571)	(326,583)
Net premiums earned	382,265	351,402	748,310	705,008
Net investment income	54,163	54,124	108,488	82,987
Net foreign exchange gains (losses)	3,109	(690)	11,274	(2,382)
Equity in earnings of other ventures	5,543	6,022	4,036	7,633
Other income	2,392	2,654	4,057	6,733
Net realized and unrealized gains on investments	58,113	69,772	101,486	131,425
Total revenues	505,585	483,284	977,651	931,404
Expenses
Net claims and claim expenses incurred	142,587	167,750	335,668	294,355
Acquisition expenses	88,251	69,005	171,533	134,597
Operational expenses	41,766	51,073	89,049	107,308
Corporate expenses	4,636	5,752	9,922	13,977
Interest expense	10,091	10,536	20,617	21,074
Total expenses	287,331	304,116	626,789	571,311
Income before taxes	218,254	179,168	350,862	360,093
Income tax expense	(3,904)	(6,612)	(4,238)	(9,356)
Net income	214,350	172,556	346,624	350,737
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Net income attributable to RenaissanceRe	176,738	141,921	274,685	275,511
Dividends on preference shares	(5,596)	(5,596)	(11,191)	(11,191)
Net income available to RenaissanceRe common shareholders	$ 171,142	$ 136,325	$ 263,494	$ 264,320
Net income available to RenaissanceRe common shareholders per common share – basic	$ 4.25	$ 3.23	$ 6.50	$ 6.20
Net income available to RenaissanceRe common shareholders per common share – diluted	4.24	3.22	6.47	6.16
Dividends per common share (in dollars per share)	$ 0.32	$ 0.31	$ 0.64	$ 0.62

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income
Net income	$ 214,350	$ 172,556	$ 346,624	$ 350,737
Change in net unrealized gains on investments	219	672	(1,272)	229
Comprehensive income	214,569	173,228	345,352	350,966
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to RenaissanceRe	$ 176,957	$ 142,593	$ 273,413	$ 275,740

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Preference Shares	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Beginning of period at Dec. 31, 2015		$ 400,000	$ 43,701	$ 507,674	$ 2,108	$ 3,778,701
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares			(2,420)	(269,847)
Exercise of options and issuance of restricted stock awards			215	5,465
Change in redeemable noncontrolling interests				(731)
Change in net unrealized gains on investments					229
Net income	$ 350,737					350,737
Net income attributable to redeemable noncontrolling interests	(75,226)					(75,226)
Dividends on common shares						(26,198)
Dividends on preference shares	(11,191)					(11,191)
End of period at Jun. 30, 2016	4,703,217	400,000	41,496	242,561	2,337	4,016,823
Beginning of period at Dec. 31, 2016	4,866,577	400,000	41,187	216,558	1,133	4,207,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares			(1,052)	(148,608)
Exercise of options and issuance of restricted stock awards			147	(61)
Change in redeemable noncontrolling interests				(306)
Change in net unrealized gains on investments					(1,272)
Net income	346,624					346,624
Net income attributable to redeemable noncontrolling interests	(71,939)					(71,939)
Dividends on common shares						(25,877)
Dividends on preference shares	(11,191)					(11,191)
End of period at Jun. 30, 2017	$ 4,955,255	$ 400,000	$ 40,282	$ 67,583	$ (139)	$ 4,447,529

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows provided by operating activities
Net income	$ 346,624	$ 350,737
Adjustments to reconcile net income to net cash provided by operating activities
Amortization, accretion and depreciation	11,499	11,036
Equity in undistributed losses (earnings) of other ventures	20,304	(2,308)
Net realized and unrealized gains on investments	(101,486)	(131,425)
Net unrealized (gains) losses included in net investment income	(12,491)	20,360
Change in:
Premiums receivable	(546,510)	(554,658)
Prepaid reinsurance premiums	(264,062)	(302,421)
Reinsurance recoverable	(91,022)	(87,480)
Deferred acquisition costs	(94,781)	(131,772)
Reserve for claims and claim expenses	141,512	77,198
Unearned premiums	615,633	629,004
Reinsurance balances payable	378,511	229,725
Other	(62,708)	17,245
Net cash provided by operating activities	341,023	125,241
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	5,163,972	4,780,406
Purchases of fixed maturity investments trading	(5,451,362)	(4,984,820)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	5,216
Net sales of equity investments trading	46,305	181,634
Net sales of short term investments	276,075	245,899
Net sales (purchases) of other investments	2,551	(52,778)
Net cash provided by investing activities	37,541	175,557
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(25,877)	(26,198)
Dividends paid – preference shares	(11,191)	(11,191)
RenaissanceRe common share repurchases	(145,940)	(265,003)
Issuance of debt, net of expenses	295,866	0
Repayment of debt	(250,000)	0
Net third party redeemable noncontrolling interest share transactions	(33,655)	(43,909)
Taxes paid on withholding shares	(11,251)	(8,069)
Net cash used in financing activities	(182,048)	(354,370)
Effect of exchange rate changes on foreign currency cash	5,477	2,208
Net increase (decrease) in cash and cash equivalents	201,993	(51,364)
Cash and cash equivalents, beginning of period	421,157	506,885
Cash and cash equivalents, end of period	$ 623,150	$ 455,521

Organization

Organization	6 Months Ended
	Jun. 30, 2017
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, 2016 . 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, a Bermuda-domiciled reinsurance company, is the Company’s principal reinsurance subsidiary and provides property, casualty and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis. Effective October 1, 2016, each of Renaissance Reinsurance Specialty Risks Ltd. and Platinum Underwriters Bermuda, Ltd. merged into Renaissance Reinsurance, with Renaissance Reinsurance being the sole surviving entity. • Renaissance Reinsurance U.S. Inc. (“Renaissance Reinsurance U.S.”) is a reinsurance company domiciled in the state of Maryland that provides property, casualty and specialty reinsurance coverages to insurers and reinsurers, primarily in the Americas. • RenaissanceRe Underwriting Managers U.S. LLC, a specialty reinsurance agency domiciled in the state of 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, which operates subject to U.S. federal income tax, and RenaissanceRe Syndicate 1458 (“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. • The Company also manages property, casualty 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 and all significant intercompany transactions have been eliminated. 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 of RenaissanceRe, acts as exclusive underwriting manager for these joint ventures in return for fee-based income and profit participation. • 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. Third party investors have subscribed for a portion of the participating, non-voting common shares of Medici. Because the Company owns a noncontrolling equity interest in, but controls a majority of the outstanding voting power of, Medici’s parent, RenaissanceRe Fund Holdings Ltd. (“Fund Holdings”), the results of Medici and Fund Holdings are consolidated in the Company’s financial statements and all significant inter-company transactions have been eliminated. Redeemable noncontrolling interest - Medici represents the interests of external parties with respect to the net income and shareholders’ equity of Medici. • Effective January 1, 2013, the Company formed and launched a managed joint venture, Upsilon RFO Re Ltd., formerly known as Upsilon Reinsurance II Ltd. (“Upsilon RFO”), 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. 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. • Effective November 13, 2014, the Company incorporated RenaissanceRe Upsilon Fund Ltd. (“Upsilon Fund”), an exempted Bermuda segregated accounts company. Upsilon Fund was formed to provide a fund structure through which third party investors can invest in reinsurance risk managed by the Company. As a segregated accounts company, Upsilon Fund is permitted to establish segregated accounts to invest in and hold identified pools of assets and liabilities. Each pool of assets and liabilities in each segregated account is structured to be ring-fenced from any claims from the creditors of Upsilon Fund’s general account and from the creditors of other segregated accounts within Upsilon Fund. Third party investors purchase redeemable, non-voting preference shares linked to specific segregated accounts of Upsilon Fund and own 100% of these shares. Upsilon Fund is an investment company and is considered a VIE. The Company is not considered the primary beneficiary of Upsilon Fund and, as a result, the Company does not consolidate the financial position and results of operations of Upsilon Fund. • Effective November 7, 2016, Fibonacci Reinsurance Ltd. ("Fibonacci Re"), a Bermuda-domiciled SPI, was formed to provide collateralized capacity to Renaissance Reinsurance and its affiliates. Fibonacci Re raised capital from third party investors and the Company, via private placements of participating notes which are listed on the Bermuda Stock Exchange. Fibonacci Re is considered a VIE. The Company is not considered the primary beneficiary of Fibonacci Re and, as a result, the Company does not consolidate the financial position and results of operations of Fibonacci Re.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
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, 2016 , except as noted below. BASIS OF PRESENTATION These 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. 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. RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 was issued to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and the classification of taxes paid on the statements of cash flows. ASU 2016-09 became effective for the Company in annual and interim periods beginning after December 15, 2016. The cumulative effect of the adoption of ASU 2016-09 was a $2.2 million increase to opening retained earnings as of January 1, 2017. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED Revenue from Contracts with Customers In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 provides comprehensive guidance on the recognition of revenue from customers arising from the transfer of goods and services. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also provides guidance on accounting for certain contract costs and will also require new disclosures. ASU 2014-09 was to be effective for public business entities in annual and interim periods beginning after December 15, 2016, however in July 2015, the FASB decided to defer by one year the effective dates of ASU 2014-09, and as a result, ASU 2014-09 will be effective for public business entities in annual and interim periods beginning after December 15, 2017. Early adoption is permitted. 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. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous guidance. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early application is permitted. 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. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option, requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets. ASU 2016-01 is effective for public business entities in annual and interim periods beginning after December 15, 2017. Earlier adoption is generally not permitted, except for certain specific provisions of ASU 2016-01. 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. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 modifies the recognition of credit losses by replacing the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is applicable to financial assets such as loans, debt securities, trade receivables, off-balance sheet credit exposures, reinsurance receivables, and other financial assets that have the contractual right to receive cash. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. The Company's invested assets are measured at fair value through net income, and therefore those invested assets would not be impacted by the adoption of ASU 2016-13. The Company has other financial assets, such as reinsurance recoverables, that could be impacted by the adoption of ASU 2016-13. ASU 2016-13 is effective for public business entities that are SEC filers for annual and interim periods beginning after December 15, 2019. 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. Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 clarifies the classification of receipts and payments in the statement of cash flows. ASU 2016-15 provides guidance related to (1) settlement and payment of zero coupon debt instruments, (2) contingent consideration, (3) proceeds from settlement of insurance claims, (4) proceeds from settlement of corporate and bank owned life insurance policies, (5) distributions from equity method investees, (6) cash receipts from beneficial interests obtained by a transferor, and (7) general guidelines for cash receipts and payments that have more than one aspect of classification. ASU 2016-15 is effective for public business entities for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. 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 cash flows. Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). ASU 2016-16 requires entities to recognize the income tax consequences of intra-entity transfers of assets other than inventory when the transfers occur; this is a change from current guidance which prohibits the recognition of current and deferred income taxes until the underlying assets have been sold to outside entities. ASU 2016-16 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. 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. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). Among other things, ASU 2017-04 requires the following: (1) the elimination of step 2 of the goodwill impairment test; entities will no longer utilize the implied fair value of their assets and liabilities for purposes of testing goodwill for impairment, (2) the quantitative portion of the goodwill impairment test will be performed by comparing the fair value of a reporting unit with its carrying amount; an impairment charge is to be recognized for the excess of carrying amount over fair value, but only to the extent of the amount of goodwill allocated to that reporting unit, and (3) foreign currency translation adjustments are not to be allocated to a reporting unit from an entity’s accumulated other comprehensive income; the reporting unit’s carrying amount should include only the currently translated balances of the assets and liabilities assigned to the reporting unit. ASU 2017-04 is effective for public business entities that are SEC filers for annual periods, or any interim goodwill impairment tests in annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. 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.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments [Abstract]
Investments	INVESTMENTS Fixed Maturity Investments Trading The following table summarizes the fair value of fixed maturity investments trading: June 30, December 31, U.S. treasuries $ 2,826,681 $ 2,617,894 Agencies 83,343 90,972 Municipal 518,912 519,069 Non-U.S. government (Sovereign debt) 173,667 333,224 Non-U.S. government-backed corporate 74,620 133,300 Corporate 2,186,040 1,877,243 Agency mortgage-backed 567,560 462,493 Non-agency mortgage-backed 275,268 258,944 Commercial mortgage-backed 384,610 409,747 Asset-backed 191,563 188,358 Total fixed maturity investments trading $ 7,282,264 $ 6,891,244 Contractual maturities of fixed maturity investments trading are described in the following table. 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. June 30, 2017 Amortized Cost Fair Value Due in less than one year $ 428,307 $ 427,683 Due after one through five years 4,112,662 4,111,191 Due after five through ten years 1,137,632 1,153,811 Due after ten years 168,920 170,578 Mortgage-backed 1,218,486 1,227,438 Asset-backed 191,013 191,563 Total $ 7,257,020 $ 7,282,264 Equity Investments Trading The following table summarizes the fair value of equity investments trading: June 30, December 31, Financials $ 272,982 $ 275,065 Communications and technology 42,316 36,770 Industrial, utilities and energy 31,852 30,303 Consumer 22,078 20,501 Healthcare 20,087 17,245 Basic materials 4,090 3,429 Total $ 393,405 $ 383,313 Pledged Investments At June 30, 2017 , $2.8 billion 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 letter of credit facilities ( December 31, 2016 - $2.7 billion ). Of this amount, $888.2 million is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities ( December 31, 2016 - $842.6 million ). Reverse Repurchase Agreements At June 30, 2017 , the Company held $33.8 million ( December 31, 2016 - $78.7 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 includes high-quality, readily marketable instruments at a minimum amount of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. Net Investment Income The components of net investment income are as follows: Three months ended Six months ended June 30, June 30, June 30, June 30, Fixed maturity investments $ 44,356 $ 46,091 $ 87,775 $ 82,097 Short term investments 2,981 1,227 4,705 2,227 Equity investments 889 865 1,700 2,528 Other investments Private equity investments 6,611 4,356 14,413 (5,002 ) Other 2,899 5,035 6,971 8,344 Cash and cash equivalents 295 209 484 338 58,031 57,783 116,048 90,532 Investment expenses (3,868 ) (3,659 ) (7,560 ) (7,545 ) Net investment income $ 54,163 $ 54,124 $ 108,488 $ 82,987 Net Realized and Unrealized Gains on Investments Net realized and unrealized gains on investments are as follows: Three months ended Six months ended June 30, June 30, June 30, June 30, Gross realized gains $ 15,249 $ 22,661 $ 26,710 $ 40,411 Gross realized losses (7,243 ) (7,804 ) (23,776 ) (22,469 ) Net realized gains on fixed maturity investments 8,006 14,857 2,934 17,942 Net unrealized gains on fixed maturity investments trading 18,760 44,271 43,395 129,736 Net realized and unrealized losses on investments-related derivatives (268 ) (9,151 ) (324 ) (28,600 ) Net realized gains on equity investments trading 15,146 14,729 36,061 13,911 Net unrealized gains (losses) on equity investments trading 16,469 5,066 19,420 (1,564 ) Net realized and unrealized gains on investments $ 58,113 $ 69,772 $ 101,486 $ 131,425

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
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. 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, or Level 2 and 3 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, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,826,681 $ 2,826,681 $ — $ — Agencies 83,343 — 83,343 — Municipal 518,912 — 518,912 — Non-U.S. government (Sovereign debt) 173,667 — 173,667 — Non-U.S. government-backed corporate 74,620 — 74,620 — Corporate 2,186,040 — 2,186,040 — Agency mortgage-backed 567,560 — 567,560 — Non-agency mortgage-backed 275,268 — 275,268 — Commercial mortgage-backed 384,610 — 384,610 — Asset-backed 191,563 — 191,563 — Total fixed maturity investments 7,282,264 2,826,681 4,455,583 — Short term investments 1,070,950 — 1,070,950 — Equity investments trading 393,405 393,405 — — Other investments Catastrophe bonds 348,353 — 348,353 — Private equity partnerships (1) 194,331 — — — Senior secured bank loan funds (1) 17,321 — — — Hedge funds (1) 1,207 — — — Total other investments 561,212 — 348,353 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (9,502 ) — — (9,502 ) Derivatives (3) 6,391 210 6,181 — Other (5,355 ) — (5,355 ) — Total other assets and (liabilities) (8,466 ) 210 826 (9,502 ) $ 9,299,365 $ 3,220,296 $ 5,875,712 $ (9,502 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at June 30, 2017 was $5.8 million and $15.3 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,617,894 $ 2,617,894 $ — $ — Agencies 90,972 — 90,972 — Municipal 519,069 — 519,069 — Non-U.S. government (Sovereign debt) 333,224 — 333,224 — Non-U.S. government-backed corporate 133,300 — 133,300 — Corporate 1,877,243 — 1,877,243 — Agency mortgage-backed 462,493 — 462,493 — Non-agency mortgage-backed 258,944 — 258,944 — Commercial mortgage-backed 409,747 — 409,747 — Asset-backed 188,358 — 188,358 — Total fixed maturity investments 6,891,244 2,617,894 4,273,350 — Short term investments 1,368,379 — 1,368,379 — Equity investments trading 383,313 383,313 — — Other investments Catastrophe bonds 335,209 — 335,209 — Private equity partnerships (1) 191,061 — — — Senior secured bank loan funds (1) 22,040 — — — Hedge funds (1) 1,495 — — — Total other investments 549,805 — 335,209 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (13,004 ) — — (13,004 ) Derivatives (3) (8,922 ) (646 ) (8,276 ) — Other (13,105 ) — (13,105 ) — Total other assets and (liabilities) (35,031 ) (646 ) (21,381 ) (13,004 ) $ 9,157,710 $ 3,000,561 $ 5,955,557 $ (13,004 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at December 31, 2016 was $4.4 million and $17.4 million of other assets and other liabilities, respectively. (3) See “Note 13 . 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, municipal, 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, 2017 , the Company’s U.S. treasuries fixed maturity investments were primarily priced by pricing services and had a weighted average effective yield of 1.5% and a weighted average credit quality of AA ( December 31, 2016 - 1.4% 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, 2017 , the Company’s agency fixed maturity investments had a weighted average effective yield of 2.0% and a weighted average credit quality of AA ( December 31, 2016 - 2.0% 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. Municipal Level 2 - At June 30, 2017 , the Company’s municipal fixed maturity investments had a weighted average effective yield of 1.9% and a weighted average credit quality of AA ( December 31, 2016 - 2.4% and AA, respectively). The Company’s municipal fixed maturity investments are primarily priced by pricing services. When evaluating these securities, the pricing services gather information regarding the security from third party sources such as trustees, paying agents or issuers. 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 over widely accepted market benchmarks. Non-U.S. government (Sovereign debt) Level 2 - At June 30, 2017 , the Company’s non-U.S. government fixed maturity investments had a weighted average effective yield of 1.7% and a weighted average credit quality of AAA ( December 31, 2016 - 1.6% and AAA, 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 that 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 - At June 30, 2017 , the Company’s non-U.S. government-backed corporate fixed maturity investments had a weighted average effective yield of 1.8% and a weighted average credit quality of AA ( December 31, 2016 - 1.5% and AAA, respectively). Non-U.S. government-backed fixed maturity investments are primarily priced by pricing services that 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, 2017 , the Company’s corporate fixed maturity investments principally consisted of U.S. and international corporations and had a weighted average effective yield of 3.6% and a weighted average credit quality of BBB ( December 31, 2016 - 3.7% 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, 2017 , the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average effective yield of 3.0% , a weighted average credit quality of AA and a weighted average life of 6.6 years ( December 31, 2016 - 2.9% , AA and 6.9 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 that were classified as sub-prime at the time of purchase held in its fixed maturity investments portfolio. At June 30, 2017 , the Company’s non-agency prime residential mortgage-backed fixed maturity investments had a weighted average effective yield of 4.0% , a weighted average credit quality of non-investment grade, and a weighted average life of 5.1 years ( December 31, 2016 - 4.3% , BBB and 5.1 years, respectively). The Company’s non-agency Alt-A fixed maturity investments held at June 30, 2017 had a weighted average effective yield of 4.4% , a weighted average credit quality of non-investment grade and a weighted average life of 6.1 years ( December 31, 2016 - 5.2% , non-investment grade and 6.0 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 - At June 30, 2017 , the Company’s commercial mortgage-backed fixed maturity investments had a weighted average effective yield of 2.8% , a weighted average credit quality of AAA, and a weighted average life of 4.8 years ( December 31, 2016 - 2.6% , AAA and 3.9 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 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 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, 2017 , the Company’s asset-backed fixed maturity investments had a weighted average effective yield of 2.5% , a weighted average credit quality of AAA and a weighted average life of 2.7 years ( December 31, 2016 - 2.3% , AAA and 2.6 years, respectively). The underlying collateral for the Company’s asset-backed fixed maturity investments primarily consists of bank loans, 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 - At June 30, 2017 , the Company’s short term investments had a weighted average effective yield of 1.1% and a weighted average credit quality of AAA ( December 31, 2016 - 0.7% and AAA, respectively). 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 futures contracts which are considered Level 1, and foreign currency contracts 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. For credit derivatives, these inputs include credit spreads, credit ratings of the underlying referenced security, the risk free rate and the contract term. For foreign currency contracts, these inputs include spot rates and interest rate curves. Other Level 2 - The liabilities measured at fair value and included in Level 2 at June 30, 2017 of $5.4 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, 2017 Fair Value (Level 3) Valuation Technique Unobservable (U) and Observable (O) Inputs Low High Weighted Average or Actual Other assets and (liabilities) Assumed and ceded (re)insurance contracts $ 809 Internal valuation model Bond price (U) $ 101.59 $ 111.15 $ 106.94 Liquidity discount (U) n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (10,311 ) Internal valuation model Net undiscounted cash flows (U) n/a n/a $ (12,715 ) Expected loss ratio (U) n/a n/a 30.6 % Net acquisition expense ratio (O) n/a n/a (17.4 )% Contract period (O) 2.0 years 4.7 years 4.5 years Discount rate (U) n/a n/a 1.9 % Total other assets and (liabilities) $ (9,502 ) Fixed Maturity Investments Corporate Level 3 - Previously, the Company’s corporate fixed maturity investments included an investment in the preferred equity of an insurance holding company. The Company measured the fair value of this investment using a discounted cash flow model and ultimately sold this investment during the year ended December 31, 2016. Other assets and liabilities Assumed and ceded (re)insurance contracts Level 3 - At June 30, 2017 , the Company had a $0.8 million net asset related to an assumed reinsurance contract accounted for at fair value, with the fair value obtained through the use of an internal valuation model. The inputs to the internal valuation model are principally based on indicative pricing obtained from independent brokers and pricing vendors for similarly structured marketable securities. The most significant unobservable inputs include prices for similar marketable securities and a liquidity premium. The Company considers the prices for similar securities to be unobservable, as there is little, if any market activity for these similar assets. In addition, the Company has estimated a liquidity premium that would be required if the Company attempted to effectively exit its position by executing a short sale of these securities. Generally, an increase in the prices for similar marketable securities or a decrease in the liquidity premium would result in an increase in the expected profit and ultimate fair value of this assumed reinsurance contract. Level 3 - At June 30, 2017 , the Company had a $10.3 million net liability related to assumed and ceded (re)insurance contracts accounted for at fair value, with the fair value obtained through the use of an internal valuation model. The inputs to the internal valuation model are principally based on proprietary data as observable market inputs are generally not available. The most significant unobservable inputs include the assumed and ceded expected net cash flows related to the contracts, including the expected premium, acquisition expenses and losses; the expected loss ratio and the relevant discount rate used to present value the net cash flows. The contract period and acquisition expense ratio are considered observable input as each is defined in the contract. The negative acquisition expense ratio used to determine the fair value of the contracts at June 30, 2017 is the result of override commissions on the contracts being higher than the gross acquisition expenses. Generally, an increase in the net expected cash flows and expected term of the contract and a decrease in the discount rate, expected loss ratio or acquisition expense ratio, would result in an increase in the expected profit and ultimate fair value of these assumed and ceded (re)insurance contracts. 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. Other assets and (liabilities) Balance - April 1, 2017 $ (12,135 ) Total realized and unrealized gains Included in other income 2,319 Purchases 314 Balance - June 30, 2017 $ (9,502 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,390 Purchases 112 Balance - June 30, 2017 $ (9,502 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - April 1, 2016 $ 7,500 $ (4,724 ) $ 2,776 Total realized and unrealized gains Included in other income — 2,092 2,092 Purchases — (48 ) (48 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 3,792 3,792 Purchases — (573 ) (573 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 ) 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 and cash equivalents, accrued investment income, 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. Debt Included on the Company’s consolidated balance sheet at June 30, 2017 were debt obligations of $988.9 million ( December 31, 2016 - $948.7 million ). At June 30, 2017 , the fair value of the Company’s debt obligations was $1,021.3 million ( December 31, 2016 – $964.8 million ). The fair value of the Company’s debt obligations 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 Company’s debt obligations. 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, Other investments $ 561,212 $ 549,805 Other assets $ 5,756 $ 4,379 Other liabilities $ 15,258 $ 17,383 Included in net investment income for the three and six months ended June 30, 2017 were net unrealized gains of $5.6 million and $12.5 million related to the changes in fair value of other investments ( 2016 – losses of $5.8 million and $3.2 million ). Included in other income for the three and six months ended June 30, 2017 were net unrealized gains of $Nil and $Nil related to the changes in the fair value of other assets and liabilities ( 2016 - $Nil and $Nil ). 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 as a practical expedient: At June 30, 2017 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity partnerships $ 194,331 $ 310,367 See below See below See below Senior secured bank loan funds 17,321 26,102 See below See below See below Hedge funds 1,207 — See below See below See below Total other investments measured using net asset valuations $ 212,859 $ 336,469 Private equity partnerships – The Company’s investments in private equity partnerships included 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 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 – At June 30, 2017 , the Company had $17.3 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. It is estimated that the majority of the underlying assets in these closed end funds would liquidate over 4 to 5 years from inception of the applicable fund. Hedge funds – The Company invests in hedge funds that pursue multiple strategies. The Company’s investments in hedge funds at June 30, 2017 were $1.2 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 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, 2017
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 payments of additional premiums, for reinstatement premiums and for lost no-claims bonuses, which are incurred when losses are ceded to the respective 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 Six months ended June 30, June 30, June 30, June 30, Premiums written Direct $ 67,805 $ 57,541 $ 141,213 $ 100,717 Assumed 759,610 701,587 1,608,292 1,520,544 Ceded (271,670 ) (239,212 ) (649,624 ) (589,670 ) Net premiums written $ 555,745 $ 519,916 $ 1,099,881 $ 1,031,591 Premiums earned Direct $ 56,357 $ 37,936 $ 114,525 $ 71,076 Assumed 520,347 464,540 1,019,346 921,181 Ceded (194,439 ) (151,074 ) (385,561 ) (287,249 ) Net premiums earned $ 382,265 $ 351,402 $ 748,310 $ 705,008 Claims and claim expenses Gross claims and claim expenses incurred $ 189,903 $ 224,852 $ 441,707 $ 386,850 Claims and claim expenses recovered (47,316 ) (57,102 ) (106,039 ) (92,495 ) Net claims and claim expenses incurred $ 142,587 $ 167,750 $ 335,668 $ 294,355

Reserve for Claims and Claim Ex

Reserve for Claims and Claim Expenses	6 Months Ended
	Jun. 30, 2017
Insurance Loss Reserves [Abstract]
Reserve for Claims and Claim Expenses	RESERVE FOR CLAIMS AND CLAIM EXPENSES The Company believes the most significant accounting judgment made by management is its estimate of claims and claim expense reserves. Claims and claim expense reserves represent estimates, including actuarial and statistical projections at a given point in time, of the ultimate settlement and administration costs for unpaid claims and claim expenses arising from the insurance and reinsurance contracts the Company sells. The Company establishes its claims and claim expense reserves by taking claims reported to the Company by insureds and ceding companies, but which have not yet been paid (“case reserves”), adding estimates for the anticipated cost of claims incurred but not yet reported to the Company, or incurred but not enough reported to the Company (collectively referred to as “IBNR”) and, if deemed necessary, adding costs for additional case reserves which represent the Company’s estimates for claims related to specific contracts previously reported to the Company which it believes may not be adequately estimated by the client as of that date, or adequately covered in the application of IBNR. The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR: At June 30, 2017 Case Reserves Additional Case Reserves IBNR Total Property $ 221,898 $ 167,510 $ 216,163 $ 605,571 Casualty and Specialty 635,834 111,021 1,619,915 2,366,770 Other 2,532 — 14,933 17,465 Total $ 860,264 $ 278,531 $ 1,851,011 $ 2,989,806 At December 31, 2016 Property $ 214,954 $ 186,308 $ 226,512 $ 627,774 Casualty and Specialty 591,705 105,419 1,498,002 2,195,126 Other 6,935 — 18,459 25,394 Total $ 813,594 $ 291,727 $ 1,742,973 $ 2,848,294 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Six months ended June 30, 2017 2016 Net reserves as of January 1 $ 2,568,730 $ 2,632,519 Net incurred related to: Current year 351,766 325,214 Prior years (16,098 ) (30,859 ) Total net incurred 335,668 294,355 Net paid related to: Current year 19,885 11,070 Prior years 285,046 297,716 Total net paid 304,931 308,786 Foreign exchange 19,753 4,149 Net reserves as of June 30 2,619,220 2,622,237 Reinsurance recoverable as of June 30 370,586 222,006 Gross reserves as of June 30 $ 2,989,806 $ 2,844,243 Prior Year Development of the Reserve for Net Claims and Claim Expenses The Company’s estimates of claims and claim expense reserves are not precise in that, among other things, they are based on predictions of future developments and estimates of future trends and other variable factors. Some, but not all, of the Company’s reserves are further subject to the uncertainty inherent in actuarial methodologies and estimates. Because a reserve estimate is simply an insurer’s estimate at a point in time of its ultimate liability, and because there are numerous factors that affect reserves and claims payments that cannot be determined with certainty in advance, the Company’s ultimate payments will vary, perhaps materially, from its estimates of reserves. If the Company determines in a subsequent period that adjustments to its previously established reserves are appropriate, such adjustments are recorded in the period in which they are identified. On a net basis, the Company’s cumulative favorable or unfavorable development is generally reduced by offsetting changes in its reinsurance recoverables, as well as changes to loss related premiums such as reinstatement premiums and redeemable noncontrolling interest for changes in claims and claim expenses that impact DaVinciRe, all of which generally move in the opposite direction to changes in the Company’s ultimate claims and claim expenses. The following table details the Company’s prior year development by segment of its liability for unpaid claims and claim expenses: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Property $ (24,800 ) $ (18,989 ) Casualty and Specialty 9,257 (11,873 ) Other (555 ) 3 Total favorable development of prior accident years net claims and claim expenses $ (16,098 ) $ (30,859 ) Changes to prior year estimated claims reserves increased the Company’s net income by $16.1 million during the six months ended June 30, 2017 , ( 2016 - increased the Company’s net income by $30.9 million ), excluding the consideration of changes in reinstatement, adjustment or other premium changes, profit commissions, redeemable noncontrolling interest - DaVinciRe and income tax. Property Segment The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events New Zealand Earthquake (2011) $ 5,807 $ — New Zealand Earthquake (2010) 4,061 2,962 April and May U.S. Tornadoes (2011) (4,153 ) (1,408 ) Other (3,864 ) (500 ) Total large catastrophe events 1,851 1,054 Small catastrophe events Fort McMurray Wildfire (2016) (5,848 ) — Tianjin Explosion (2015) (4,896 ) — U.S. PCS 13/14 Wind and Thunderstorm (2013) (3,906 ) (6,260 ) Other (12,844 ) (13,783 ) Total small catastrophe events (27,494 ) (20,043 ) Total catastrophe net claims and claim expenses (25,643 ) (18,989 ) Actuarial assumption changes 843 — Total net favorable development of prior accident years net claims and claim expenses $ (24,800 ) $ (18,989 ) The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the six months ended June 30, 2017 of $24.8 million was comprised of net adverse development of $1.9 million related to large catastrophe events, net favorable development of $27.5 million related to small catastrophe events and $0.8 million of adverse development associated with actuarial assumption changes. Included in net adverse development of prior accident years net claims and claim expenses from large events was adverse development of $5.8 million related to the 2011 New Zealand Earthquake and $4.1 million related to the 2010 New Zealand Earthquake due to increases in the estimated expected losses associated with these events. Partially offsetting these events was favorable development of $4.2 million and $3.9 million related to the 2011 April and May U.S. Tornadoes and a number of other events, respectively, due to reductions in the estimated ultimate losses associated with these events. Included in net favorable development of prior accident years net claims and claims expenses from small events was a reduction in the estimated ultimate losses associated with the 2016 Fort McMurray Wildfire of $5.8 million , the 2015 Tianjin Explosion of $4.9 million and certain 2013 U.S. wind and thunderstorm events of $3.9 million . In addition, the Company’s Property segment experienced net favorable development of $12.8 million associated with a number of other small catastrophe events related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods. The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the six months ended June 30, 2016 of $19.0 million was comprised of net adverse development of $1.1 million from large catastrophe events due principally to an increase in the estimated ultimate loss for the 2010 New Zealand Earthquake, and net favorable development of $20.0 million related to small catastrophe events related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods. Casualty and Specialty Segment The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Actuarial methods - actual reported claims lower than expected claims $ (21,762 ) $ (5,755 ) Ogden Rate change 33,481 — Actuarial assumption changes (2,462 ) (6,118 ) Total adverse (favorable) development of prior accident years net claims and claim expenses $ 9,257 $ (11,873 ) The net adverse development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment in the six months ended June 30, 2017 of $9.3 million was driven by $33.5 million of adverse development associated with the change in the discount rate used to calculate lump sum awards in U.K. bodily injury cases (the “Ogden Rate”), from 2.5% , to minus 0.75% . Notwithstanding the impact of the Ogden Rate change, we experienced $21.8 million of net favorable development in the six months ended June 30, 2017 related to actual reported losses coming in lower than expected on attritional net claims and claim expenses across a number of lines of business and $2.5 million of net favorable development associated with actuarial assumption changes. The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment in the six months ended June 30, 2016 of $11.9 million was driven by $5.8 million of favorable development related to actual reported net claims and claim expenses coming in lower than expected on prior accident years events and $6.1 million of favorable development associated with actuarial assumption changes.

Debt and Credit Facilities

Debt and Credit Facilities	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES Except as noted below, there have been no material changes to the Company’s debt and credit facilities as described in its Form 10-K for the year ended December 31, 2016 . Debt Obligations A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below: June 30, 2017 December 31, 2016 Fair Value Carrying Value Fair Value Carrying Value 3.450% Senior Notes due 2027 $ 296,400 $ 295,053 $ — $ — 3.700% Senior Notes due 2025 300,327 297,132 291,750 296,948 5.75% Senior Notes due 2020 268,228 249,106 270,875 248,941 Series B 7.50% Senior Notes due 2017 — — 257,500 255,352 4.750% Senior Notes due 2025 (DaVinciRe) (1) 156,386 147,575 144,675 147,422 $ 1,021,341 $ 988,866 $ 964,800 $ 948,663 (1) RenaissanceRe owns a noncontrolling economic interest in its joint venture DaVinciRe. 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 RenaissanceRe. However, RenaissanceRe does not guarantee or provide credit support for DaVinciRe and RenaissanceRe’s financial exposure to DaVinciRe is limited to its investment in DaVinciRe’s shares and counterparty credit risk arising from reinsurance transactions. 3.450% Senior Notes due 2027 of RenaissanceRe Finance On June 29, 2017 , RenaissanceRe Finance issued $300.0 million of its 3.450% Senior Notes due July 1, 2027 , with interest on the notes payable on July 1 and January 1 of each year. The notes are fully and unconditionally guaranteed by RenaissanceRe and may be redeemed by RenaissanceRe Finance prior to maturity, subject to the payment of a “make-whole” premium if the notes are redeemed prior to April 1, 2027 . The notes contain various covenants, including limitations on mergers and consolidations, and restrictions as to the disposition of, and the placing of liens on, stock of designated subsidiaries. The net proceeds from the offering of the notes are to be used for general corporate purposes. Series B 7.50% Senior Notes due 2017 of Platinum Underwriters Finance, Inc. On June 1, 2017, the Company repaid in full at maturity an aggregate principal amount of $250.0 million , plus applicable accrued interest, of its Series B 7.50% Senior Notes due 2017 assumed in connection with the acquisition of Platinum and originally issued by Platinum Underwriters Finance, Inc. Credit Facilities The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below: At June 30, 2017 Issued or Drawn RenaissanceRe Revolving Credit Facility $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 105,892 Uncommitted Standby Letter of Credit Facility with NAB 4,525 Bilateral Letter of Credit Facility with Citibank Europe 206,383 Funds at Lloyd’s Letter of Credit Facilities Renaissance Reinsurance FAL Facility 180,000 Total credit facilities in U.S. dollars $ 496,800 Funds at Lloyd’s Letter of Credit Facilities Specialty Risks FAL Facility £ 10,000 Total credit facilities in British Pounds £ 10,000 Funds at Lloyd’s Letter of Credit Facilities Effective as of May 25, 2017, Renaissance Reinsurance entered into an amendment to its letter of credit facility with Bank of Montreal (“BMO”), Citibank Europe plc, (“CEP”), and ING Bank N.V. (“ING”) as lenders (the “Renaissance Reinsurance FAL Facility”), which provided for the issuance by the lenders of two letters of credit to support business written by Syndicate 1458 with stated amounts of $380.0 million and £90.0 million , respectively. Pursuant to the amendment, the stated amount of the $380.0 million letter of credit was reduced to $180.0 million and the £90.0 million letter of credit was cancelled. In addition, pursuant to the amendment, Renaissance Reinsurance may request that the Renaissance Reinsurance FAL Facility be amended to increase the stated amount of the letter of credit, or issue a new letter or credit denominated in Pounds, in an aggregate amount for all such increases or issuances not to exceed $75.0 million or the equivalent thereof. All other terms and conditions of the Renaissance Reinsurance FAL Facility remained the same.

Noncontrolling Interests

Noncontrolling Interests	6 Months Ended
	Jun. 30, 2017
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Noncontrolling Interests	NONCONTROLLING INTERESTS A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below: June 30, December 31, 2016 Redeemable noncontrolling interest - DaVinciRe $ 1,019,918 $ 994,458 Redeemable noncontrolling interest - Medici 222,165 181,136 Redeemable noncontrolling interests $ 1,242,083 $ 1,175,594 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations set forth below: Three months ended Six months ended June 30, June 30, June 30, June 30, Redeemable noncontrolling interest - DaVinciRe $ 36,432 $ 28,288 $ 68,341 $ 71,252 Redeemable noncontrolling interest - Medici 1,180 2,347 3,598 3,974 Net income attributable to redeemable noncontrolling interests $ 37,612 $ 30,635 $ 71,939 $ 75,226 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 redeemable noncontrolling interests. The Company’s noncontrolling economic ownership in DaVinciRe was 22.6% at June 30, 2017 ( December 31, 2016 - 24.0% ). DaVinciRe shareholders are party to a 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 January 1 of the following year. The repurchase price is generally subject to a true-up for potential development on outstanding loss reserves after settlement of all claims relating to the applicable years. 2016 During January 2016, DaVinciRe redeemed a portion of its outstanding shares from certain existing DaVinciRe shareholders, including RenaissanceRe, while new DaVinciRe shareholders purchased shares in DaVinciRe from RenaissanceRe. The net redemption as a result of these transactions was $100.0 million . In connection with the redemption, DaVinciRe retained a $10.0 million holdback. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 24.0% , effective January 1, 2016. 2017 During January 2017, DaVinciRe redeemed $75.0 million of its outstanding shares from certain existing DaVinciRe shareholders, including RenaissanceRe. In connection with the redemption, DaVinciRe retained a $7.5 million holdback. In addition, RenaissanceRe sold an aggregate of $24.0 million of its shares in DaVinciRe to an existing shareholder and a new shareholder. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 22.6% , effective January 1, 2017. The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time. See “Note 16 . Subsequent Events” for additional information related to DaVinciRe share transactions subsequent to June 30, 2017 . The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below: Three months ended Six months ended June 30, June 30, June 30, June 30, Beginning balance $ 986,646 $ 926,141 $ 994,458 $ 930,955 Redemption of shares from redeemable noncontrolling interest (3,160 ) (986 ) (66,802 ) (91,804 ) Sale of shares to redeemable noncontrolling interests — — 23,921 43,040 Net income attributable to redeemable noncontrolling interest 36,432 28,288 68,341 71,252 Ending balance $ 1,019,918 $ 953,443 $ 1,019,918 $ 953,443 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 redeemable 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. 2016 During 2016, third-party investors subscribed for $79.5 million and redeemed $21.7 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 36.5% , effective December 31, 2016 . 2017 During the six months ended June 30, 2017 , third-party investors subscribed for $63.3 million and redeemed $25.9 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 32.3% at June 30, 2017 . The Company expects its noncontrolling economic ownership in Medici to fluctuate over time. The activity in redeemable noncontrolling interest – Medici is detailed in the table below: Three months ended Six months ended June 30, June 30, June 30, June 30, Beginning balance $ 201,345 $ 155,196 $ 181,136 $ 115,009 Redemption of shares from redeemable noncontrolling interest (15,285 ) (6,400 ) (25,910 ) (7,340 ) Sale of shares to redeemable noncontrolling interests 34,925 17,817 63,341 57,317 Net income attributable to redeemable noncontrolling interest 1,180 2,347 3,598 3,974 Ending balance $ 222,165 $ 168,960 $ 222,165 $ 168,960

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2017
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 . 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 has the power over the activities that most significantly impact the economic performance of Upsilon RFO and has the obligation to absorb expected losses and the right to receive expected benefits that could be significant to Upsilon RFO, in accordance with the accounting guidance. As a result, the Company consolidates Upsilon RFO and all significant inter-company transactions have been eliminated. Other than its equity investment in Upsilon RFO, the Company has not provided financial or other support to Upsilon RFO that it was not contractually required to provide. 2016 During 2016, Upsilon RFO returned $242.5 million of capital to its investors, including $59.8 million to the Company. In addition, during 2016, $166.6 million of Upsilon RFO non-voting preference shares were issued to existing investors therein, including $55.2 million to the Company. At December 31, 2016, the Company’s participation in the risks assumed by Upsilon RFO was 28.8% . 2017 During the six months ended June 30, 2017 , Upsilon RFO returned $41.8 million of capital to its investors, including $9.5 million to the Company. In addition, during the six months ended June 30, 2017 , $134.1 million of Upsilon RFO non-voting preference shares were issued to existing investors therein, including $9.5 million to the Company, and an existing third party investor purchased $7.5 million of Upsilon RFO non-voting preference shares from the Company. At June 30, 2017 , the Company’s participation in the risks assumed by Upsilon RFO was 16.6% . At June 30, 2017 , the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $339.1 million and $339.1 million , respectively ( December 31, 2016 - $193.0 million and $193.0 million , respectively). Mona Lisa Re Ltd. (“Mona Lisa Re”) On March 14, 2013, Mona Lisa Re was licensed as a Bermuda domiciled special purpose insurer 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 to third-party investors. Upon issuance of a series of notes by Mona Lisa Re, all of the proceeds from the issuance were 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 such 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. 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. The Company has not provided financial or other support to Mona Lisa Re that it was not contractually required to provide. At June 30, 2017 , the total assets and total liabilities of Mona Lisa Re were $181.2 million and $181.2 million , respectively ( December 31, 2016 - $184.2 million and $184.2 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 $0.1 million and $37 thousand , respectively, during the six months ended June 30, 2017 ( 2016 - $0.1 million and $0.1 million , respectively). In addition, Renaissance Reinsurance and DaVinci recognized ceded premiums earned related to the ceded reinsurance contracts with Mona Lisa Re of $3.6 million and $2.5 million , respectively, during the six months ended June 30, 2017 ( 2016 - $3.6 million and $2.5 million , respectively). Fibonacci Re Effective November 7, 2016 , Fibonacci Re, a Bermuda-domiciled SPI, was formed to provide collateralized capacity to Renaissance Reinsurance and its affiliates. Upon issuance of a series of notes by Fibonacci Re, all of the proceeds from the issuance are deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance 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 such notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of notes. RUM receives an origination and structuring fee in connection with the formation and operation of Fibonacci Re. The Company concluded that Fibonacci Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. The Company evaluated its relationship with Fibonacci Re and concluded it is not the primary beneficiary of Fibonacci Re as it does not have power over the activities that most significantly impact the economic performance of Fibonacci Re. As a result, the Company does not consolidate the financial position or results of operations of Fibonacci Re. The only transactions related to Fibonacci Re that will be recorded in the Company’s consolidated financial statements will be the ceded reinsurance agreements entered into by Renaissance Reinsurance that are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance, and the fair value of the participating notes owned by the Company. Other than its investment in the participating notes of Fibonacci Re, the Company has not provided financial or other support to Fibonacci Re that it was not contractually required to provide. Effective with the risk periods incepting on January 1, 2017 and June 1, 2017, Fibonacci Re raised $140.0 million and $45.0 million , respectively, of capital from third party investors and the Company, via private placements of participating notes which are listed on the Bermuda Stock Exchange. The fair value of the Company’s investment in the participating notes of Fibonacci Re is included in other investments and was $55.5 million at June 30, 2017 . Renaissance Reinsurance entered into ceded reinsurance contracts with Fibonacci Re with premiums ceded of $9.4 million during the six months ended June 30, 2017 . In addition, Renaissance Reinsurance recognized ceded premiums earned related to the ceded reinsurance contracts with Fibonacci Re of $3.8 million during the six months ended June 30, 2017 .

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Dividends The Board of Directors of RenaissanceRe declared dividends of $0.32 per common share to common shareholders of record on March 15, 2017 and June 15, 2017, respectively, and RenaissanceRe paid dividends of $0.32 per common share to common shareholders on March 31, 2017 and June 30, 2017, respectively. During the six months ended June 30, 2017 , the Company declared and paid $11.2 million in preference share dividends ( 2016 - $11.2 million ) and $25.9 million in common share dividends ( 2016 - $26.2 million ). Share Repurchases 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. On May 17, 2017 , RenaissanceRe’s Board of Directors approved a renewal of its authorized share repurchase program for an aggregate amount of up to $500.0 million . Unless terminated earlier by RenaissanceRe’s Board of Directors, the program will expire when the Company has repurchased the full value of the common 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, 2017 , the Company repurchased an aggregate of 1.1 million common shares in open market transactions at an aggregate cost of $149.7 million and an average price of $142.33 per common share. At June 30, 2017 , $485.1 million remained available for repurchase under the share repurchase program. See “Note 16 . Subsequent Events” for additional information related to share repurchases subsequent to June 30, 2017 .

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
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 Six months ended (common shares in thousands) June 30, June 30, June 30, June 30, Numerator: Net income available to RenaissanceRe common shareholders $ 171,142 $ 136,325 $ 263,494 $ 264,320 Amount allocated to participating common shareholders (1) (1,585 ) (1,561 ) (2,526 ) (3,166 ) Net income allocated to RenaissanceRe common shareholders $ 169,557 $ 134,764 $ 260,968 $ 261,154 Denominator: Denominator for basic income per RenaissanceRe common share - weighted average common shares 39,937 41,693 40,172 42,135 Per common share equivalents of employee stock options and restricted shares 87 192 152 263 Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 40,024 41,885 40,324 42,398 Net income available to RenaissanceRe common shareholders per common share – basic $ 4.25 $ 3.23 $ 6.50 $ 6.20 Net income available to RenaissanceRe common shareholders per common share – diluted $ 4.24 $ 3.22 $ 6.47 $ 6.16 (1) Represents earnings attributable to holders of unvested restricted shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2010 Performance-Based Equity Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2017
Segment Reporting, Measurement Disclosures [Abstract]
Segment Reporting	SEGMENT REPORTING The Company’s reportable segments are defined as follows: (1) Property, which is comprised of catastrophe and other property reinsurance and insurance written on behalf of the Company’s operating subsidiaries and certain joint ventures managed by the Company’s ventures unit, and (2) Casualty and Specialty, which is comprised of casualty and specialty reinsurance and insurance written on behalf of the Company’s operating subsidiaries and certain joint ventures managed by the Company’s ventures unit. In addition to its reportable segments, the Company has an Other category, which primarily includes its strategic investments, investments unit, corporate expenses, capital servicing costs, noncontrolling interests, certain expenses related to the acquisition of Platinum, and the remnants of its former Bermuda-based insurance operations. The Company’s Property segment is managed by the Chief Underwriting Officer - Property and the Casualty and Specialty segment is managed by the Chief Underwriting Officer - Casualty and Specialty. Each of the Chief Underwriting Officer - Property and Chief Underwriting Officer - Casualty and Specialty operate under the direction of the Company’s Group Chief Underwriting Officer, who in turn reports to the Company’s President and Chief Executive Officer. 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, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 499,347 $ 328,068 $ — $ 827,415 Net premiums written $ 336,464 $ 219,281 $ — $ 555,745 Net premiums earned $ 192,198 $ 190,065 $ 2 $ 382,265 Net claims and claim expenses incurred 33,017 109,797 (227 ) 142,587 Acquisition expenses 28,500 59,752 (1 ) 88,251 Operational expenses 24,053 17,712 1 41,766 Underwriting income $ 106,628 $ 2,804 $ 229 109,661 Net investment income 54,163 54,163 Net foreign exchange gains 3,109 3,109 Equity in earnings of other ventures 5,543 5,543 Other income 2,392 2,392 Net realized and unrealized gains on investments 58,113 58,113 Corporate expenses (4,636 ) (4,636 ) Interest expense (10,091 ) (10,091 ) Income before taxes and redeemable noncontrolling interests 218,254 Income tax expense (3,904 ) (3,904 ) Net income attributable to redeemable noncontrolling interests (37,612 ) (37,612 ) Dividends on preference shares (5,596 ) (5,596 ) Net income available to RenaissanceRe common shareholders $ 171,142 Net claims and claim expenses incurred – current accident year $ 56,889 $ 130,802 $ — $ 187,691 Net claims and claim expenses incurred – prior accident years (23,872 ) (21,005 ) (227 ) (45,104 ) Net claims and claim expenses incurred – total $ 33,017 $ 109,797 $ (227 ) $ 142,587 Net claims and claim expense ratio – current accident year 29.6 % 68.8 % 49.1 % Net claims and claim expense ratio – prior accident years (12.4 )% (11.0 )% (11.8 )% Net claims and claim expense ratio – calendar year 17.2 % 57.8 % 37.3 % Underwriting expense ratio 27.3 % 40.7 % 34.0 % Combined ratio 44.5 % 98.5 % 71.3 % Six months ended June 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 1,019,876 $ 729,629 $ — $ 1,749,505 Net premiums written $ 626,335 $ 473,546 $ — $ 1,099,881 Net premiums earned $ 379,186 $ 369,124 $ — $ 748,310 Net claims and claim expenses incurred 71,855 264,368 (555 ) 335,668 Acquisition expenses 57,603 113,931 (1 ) 171,533 Operational expenses 51,718 37,319 12 89,049 Underwriting income (loss) $ 198,010 $ (46,494 ) $ 544 152,060 Net investment income 108,488 108,488 Net foreign exchange gains 11,274 11,274 Equity in earnings of other ventures 4,036 4,036 Other income 4,057 4,057 Net realized and unrealized gains on investments 101,486 101,486 Corporate expenses (9,922 ) (9,922 ) Interest expense (20,617 ) (20,617 ) Income before taxes and redeemable noncontrolling interests 350,862 Income tax expense (4,238 ) (4,238 ) Net income attributable to redeemable noncontrolling interests (71,939 ) (71,939 ) Dividends on preference shares (11,191 ) (11,191 ) Net income available to RenaissanceRe common shareholders $ 263,494 Net claims and claim expenses incurred – current accident year $ 96,655 $ 255,111 $ — $ 351,766 Net claims and claim expenses incurred – prior accident years (24,800 ) 9,257 (555 ) (16,098 ) Net claims and claim expenses incurred – total $ 71,855 $ 264,368 $ (555 ) $ 335,668 Net claims and claim expense ratio – current accident year 25.5 % 69.1 % 47.0 % Net claims and claim expense ratio – prior accident years (6.6 )% 2.5 % (2.1 )% Net claims and claim expense ratio – calendar year 18.9 % 71.6 % 44.9 % Underwriting expense ratio 28.9 % 41.0 % 34.8 % Combined ratio 47.8 % 112.6 % 79.7 % Three months ended June 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 493,953 $ 265,175 $ — $ 759,128 Net premiums written $ 350,593 $ 169,323 $ — $ 519,916 Net premiums earned $ 191,060 $ 160,342 $ — $ 351,402 Net claims and claim expenses incurred 80,275 87,390 85 167,750 Acquisition expenses 29,389 39,616 — 69,005 Operational expenses 26,526 24,526 21 51,073 Underwriting income (loss) $ 54,870 $ 8,810 $ (106 ) 63,574 Net investment income 54,124 54,124 Net foreign exchange losses (690 ) (690 ) Equity in earnings of other ventures 6,022 6,022 Other income 2,654 2,654 Net realized and unrealized gains on investments 69,772 69,772 Corporate expenses (5,752 ) (5,752 ) Interest expense (10,536 ) (10,536 ) Income before taxes and noncontrolling interests 179,168 Income tax expense (6,612 ) (6,612 ) Net income attributable to noncontrolling interests (30,635 ) (30,635 ) Dividends on preference shares (5,596 ) (5,596 ) Net income available to RenaissanceRe common shareholders $ 136,325 Net claims and claim expenses incurred – current accident year $ 93,336 $ 103,669 $ — $ 197,005 Net claims and claim expenses incurred – prior accident years (13,061 ) (16,279 ) 85 (29,255 ) Net claims and claim expenses incurred – total $ 80,275 $ 87,390 $ 85 $ 167,750 Net claims and claim expense ratio – current accident year 48.9 % 64.7 % 56.1 % Net claims and claim expense ratio – prior accident years (6.9 )% (10.2 )% (8.4 )% Net claims and claim expense ratio – calendar year 42.0 % 54.5 % 47.7 % Underwriting expense ratio 29.3 % 40.0 % 34.2 % Combined ratio 71.3 % 94.5 % 81.9 % Six months ended June 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 938,912 $ 682,349 $ — $ 1,621,261 Net premiums written $ 583,452 $ 448,139 $ — $ 1,031,591 Net premiums earned $ 366,292 $ 338,716 $ — $ 705,008 Net claims and claim expenses incurred 102,079 192,273 3 294,355 Acquisition expenses 49,513 85,084 — 134,597 Operational expenses 55,183 52,044 81 107,308 Underwriting income (loss) $ 159,517 $ 9,315 $ (84 ) 168,748 Net investment income 82,987 82,987 Net foreign exchange losses (2,382 ) (2,382 ) Equity in earnings of other ventures 7,633 7,633 Other income 6,733 6,733 Net realized and unrealized gains on investments 131,425 131,425 Corporate expenses (13,977 ) (13,977 ) Interest expense (21,074 ) (21,074 ) Income before taxes and noncontrolling interests 360,093 Income tax expense (9,356 ) (9,356 ) Net income attributable to noncontrolling interests (75,226 ) (75,226 ) Dividends on preference shares (11,191 ) (11,191 ) Net income available to RenaissanceRe common shareholders $ 264,320 Net claims and claim expenses incurred – current accident year $ 121,068 $ 204,146 $ — $ 325,214 Net claims and claim expenses incurred – prior accident years (18,989 ) (11,873 ) 3 (30,859 ) Net claims and claim expenses incurred – total $ 102,079 $ 192,273 $ 3 $ 294,355 Net claims and claim expense ratio – current accident year 33.1 % 60.3 % 46.1 % Net claims and claim expense ratio – prior accident years (5.2 )% (3.5 )% (4.3 )% Net claims and claim expense ratio – calendar year 27.9 % 56.8 % 41.8 % Underwriting expense ratio 28.6 % 40.4 % 34.3 % Combined ratio 56.5 % 97.2 % 76.1 %

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Summary of Derivative Instruments [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS From time to time, the Company may enter 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’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 a 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 at fair value, including the location on the consolidated balance sheets of the Company’s principal derivative instruments: Derivative Assets At June 30, 2017 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 $ 1,277 973 $ 304 Other assets $ — $ 304 Foreign currency forward contracts (1) 7,245 617 6,628 Other assets — 6,628 Foreign currency forward contracts (2) 57 18 39 Other assets — 39 Credit default swaps 2,502 19 2,483 Other assets — 2,483 Total $ 11,081 $ 1,627 $ 9,454 $ — $ 9,454 Derivative Liabilities At June 30, 2017 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 $ 1,067 973 $ 94 Other liabilities $ 94 $ — Foreign currency forward contracts (1) 2,273 — 2,273 Other liabilities — 2,273 Foreign currency forward contracts (2) 97 18 79 Other liabilities — 79 Credit default swaps 636 19 617 Other liabilities — 617 Total $ 4,073 $ 1,010 $ 3,063 $ 94 $ 2,969 (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, 2016 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 $ 1,384 1,235 $ 149 Other assets $ — $ 149 Foreign currency forward contracts (1) 774 — 774 Other assets — 774 Foreign currency forward contracts (2) 621 447 174 Other assets — 174 Credit default swaps 1,429 23 1,406 Other assets — 1,406 Total $ 4,208 $ 1,705 $ 2,503 $ — $ 2,503 Derivative Liabilities At December 31, 2016 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 $ 2,030 1,235 $ 795 Other liabilities $ 789 $ 6 Foreign currency forward contracts (1) 10,550 397 10,153 Other liabilities — 10,153 Foreign currency forward contracts (2) 766 447 319 Other liabilities — 319 Credit default swaps 181 23 158 Other liabilities — 158 Total $ 13,527 $ 2,102 $ 11,425 $ 789 $ 10,636 (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 3 . 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) recognized on derivatives Amount of gain (loss) recognized on derivatives Three months ended June 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (890 ) $ (9,456 ) Foreign currency forward contracts (1) Net foreign exchange gains (losses) 5,223 (3,815 ) Foreign currency forward contracts (2) Net foreign exchange gains (losses) (267 ) 2,641 Credit default swaps Net realized and unrealized gains on investments 622 305 Total $ 4,688 $ (10,325 ) Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Six months ended June 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (1,048 ) $ (28,815 ) Foreign currency forward contracts (1) Net foreign exchange gains (losses) 6,283 (5,189 ) Foreign currency forward contracts (2) Net foreign exchange gains (losses) (900 ) (3,217 ) Credit default swaps Net realized and unrealized gains on investments 724 215 Total $ 5,059 $ (37,006 ) (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, 2017 . 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 may result in increasing or decreasing its exposure to this risk. At June 30, 2017 , the Company had $1.1 billion of notional long positions and $714.0 million of notional short positions of primarily Eurodollar, U.S. treasury and non-U.S. dollar futures contracts ( December 31, 2016 - $1.2 billion and $727.9 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 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, 2017 , the Company had outstanding underwriting related foreign currency contracts of $218.1 million in notional long positions and $104.1 million in notional short positions, denominated in U.S. dollars ( December 31, 2016 - $184.2 million and $91.4 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. From time to time, the Company may employ foreign currency forward contracts in its investment portfolio to either assume foreign currency risk or to economically hedge its exposure to currency fluctuations from these investments. 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, 2017 , the Company had outstanding investment portfolio related foreign currency contracts of $20.1 million in notional long positions and $5.1 million in notional short positions, denominated in U.S. dollars ( December 31, 2016 - $26.9 million and $57.3 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 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, 2017 , the Company had outstanding credit derivatives of $30.0 million in notional positions to hedge credit risk and $36.4 million in notional positions to assume credit risk, denominated in U.S. dollars ( December 31, 2016 - $Nil and $75.2 million , respectively).

Commitments, Contingencies and

Commitments, Contingencies and Other Items	6 Months Ended
	Jun. 30, 2017
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, 2016 . 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. In the Company’s industry, business litigation may involve allegations of underwriting or claims-handling errors or misconduct, disputes relating to the scope of, or compliance with, the terms of delegated underwriting agreements, 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 or arising out of 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 Financi

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries	6 Months Ended
	Jun. 30, 2017
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, 2017 and December 31, 2016 , condensed consolidating statements of operations and condensed consolidating statements of comprehensive income for the three and six months ended June 30, 2017 and 2016 , and condensed consolidating statements of cash flow for the six months ended June 30, 2017 . Each of RenRe North America Holdings Inc., Platinum Underwriters Finance, Inc. and RenaissanceRe Finance is a 100% owned subsidiary of RenaissanceRe. For additional information related to the terms of the Company’s outstanding debt securities, see “Note 9. Debt and Credit Facilities” in the “Notes to Consolidated Financial Statements” in the Company’s Form 10-K for the year ended December 31, 2016 and “Note 7 . Debt and Credit Facilities” in the “Notes to Consolidated Financial Statements” included herein. Condensed Consolidating Balance Sheet at June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 140,492 $ 123,517 $ — $ 323,094 $ 8,821,805 $ — $ 9,408,908 Cash and cash equivalents 2,417 276 23,986 8,356 588,115 — 623,150 Investments in subsidiaries 4,388,394 36,924 871,117 1,195,266 — (6,491,701 ) — Due from subsidiaries and affiliates 5,489 91,892 — — — (97,381 ) — Premiums receivable — — — — 1,533,833 — 1,533,833 Prepaid reinsurance premiums — — — — 705,322 — 705,322 Reinsurance recoverable — — — — 370,586 — 370,586 Accrued investment income 291 288 — 921 38,618 — 40,118 Deferred acquisition costs — — — — 430,106 — 430,106 Receivable for investments sold 52 5 — — 170,354 — 170,411 Other assets 423,601 37,547 (29 ) 130,139 115,352 (529,794 ) 176,816 Goodwill and other intangible assets 127,532 — — — 118,898 — 246,430 Total assets $ 5,088,268 $ 290,449 $ 895,074 $ 1,657,776 $ 12,892,989 $ (7,118,876 ) $ 13,705,680 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,989,806 $ — $ 2,989,806 Unearned premiums — — — — 1,847,206 — 1,847,206 Debt 117,000 — — 841,290 147,576 (117,000 ) 988,866 Amounts due to subsidiaries and affiliates 243 51 82 97,339 — (97,715 ) — Reinsurance balances payable — — — — 1,052,494 — 1,052,494 Payable for investments purchased — 24 — — 407,288 — 407,312 Other liabilities 15,770 780 (2,757 ) 9,887 206,139 (7,161 ) 222,658 Total liabilities 133,013 855 (2,675 ) 948,516 6,650,509 (221,876 ) 7,508,342 Redeemable noncontrolling interests — — — — 1,242,083 — 1,242,083 Shareholders’ Equity Total shareholders’ equity 4,955,255 289,594 897,749 709,260 5,000,397 (6,897,000 ) 4,955,255 Total liabilities, noncontrolling interests and shareholders’ equity $ 5,088,268 $ 290,449 $ 895,074 $ 1,657,776 $ 12,892,989 $ (7,118,876 ) $ 13,705,680 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Balance Sheet at December 31, 2016 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 387,274 $ 119,163 $ 267,556 $ 45,027 $ 8,497,948 $ — $ 9,316,968 Cash and cash equivalents 7,067 162 6,671 9,397 397,860 — 421,157 Investments in subsidiaries 4,074,769 34,761 843,089 1,165,413 — (6,118,032 ) — Due from subsidiaries and affiliates 7,413 91,892 — — — (99,305 ) — Premiums receivable — — — — 987,323 — 987,323 Prepaid reinsurance premiums — — — — 441,260 — 441,260 Reinsurance recoverable — — — — 279,564 — 279,564 Accrued investment income 105 289 551 106 37,025 — 38,076 Deferred acquisition costs — — — — 335,325 — 335,325 Receivable for investments sold 136 2 99 45 105,559 — 105,841 Other assets 410,757 37,204 4,689 127,572 118,098 (522,938 ) 175,382 Goodwill and other intangible assets 130,407 — — — 120,779 — 251,186 Total assets $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,848,294 $ — $ 2,848,294 Unearned premiums — — — — 1,231,573 — 1,231,573 Debt 117,000 — 255,352 545,889 147,422 (117,000 ) 948,663 Amounts due to subsidiaries and affiliates 14,644 42 123 96,061 — (110,870 ) — Reinsurance balances payable — — — — 673,983 — 673,983 Payable for investments purchased — — — — 305,714 — 305,714 Other liabilities 19,707 10,544 — 13,350 270,610 (12,527 ) 301,684 Total liabilities 151,351 10,586 255,475 655,300 5,477,596 (240,397 ) 6,309,911 Redeemable noncontrolling interests — — — — 1,175,594 — 1,175,594 Shareholders’ Equity Total shareholders’ equity 4,866,577 272,887 867,180 692,260 4,667,551 (6,499,878 ) 4,866,577 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 (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 Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 382,265 $ — $ 382,265 Net investment income 5,284 466 535 239 53,891 (6,252 ) 54,163 Net foreign exchange (losses) gains (1 ) — — — 3,110 — 3,109 Equity in earnings of other ventures — — — 302 5,241 — 5,543 Other income — — — — 2,392 — 2,392 Net realized and unrealized (losses) gains on investments (8 ) 1,421 191 (242 ) 56,751 — 58,113 Total revenues 5,275 1,887 726 299 503,650 (6,252 ) 505,585 Expenses Net claims and claim expenses incurred — — — — 142,587 — 142,587 Acquisition expenses — — — — 88,251 — 88,251 Operational expenses 3,190 16 35 6,647 36,402 (4,524 ) 41,766 Corporate expenses 4,798 — — — (162 ) — 4,636 Interest expense 141 — 985 6,601 2,505 (141 ) 10,091 Total expenses 8,129 16 1,020 13,248 269,583 (4,665 ) 287,331 (Loss) income before equity in net income of subsidiaries and taxes (2,854 ) 1,871 (294 ) (12,949 ) 234,067 (1,587 ) 218,254 Equity in net income of subsidiaries 178,746 1,220 18,185 20,438 — (218,589 ) — Income before taxes 175,892 3,091 17,891 7,489 234,067 (220,176 ) 218,254 Income tax benefit (expense) 846 (584 ) 104 2,902 (7,172 ) — (3,904 ) Net income 176,738 2,507 17,995 10,391 226,895 (220,176 ) 214,350 Net income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Net income attributable to RenaissanceRe 176,738 2,507 17,995 10,391 189,283 (220,176 ) 176,738 Dividends on preference shares (5,596 ) — — — — — (5,596 ) Net income available attributable to RenaissanceRe common shareholders $ 171,142 $ 2,507 $ 17,995 $ 10,391 $ 189,283 $ (220,176 ) $ 171,142 (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 for the three months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 176,738 $ 2,507 $ 17,995 $ 10,391 $ 226,895 $ (220,176 ) $ 214,350 Change in net unrealized gains on investments — — — — 219 — 219 Comprehensive income 176,738 2,507 17,995 10,391 227,114 (220,176 ) 214,569 Net income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Comprehensive income available to RenaissanceRe $ 176,738 $ 2,507 $ 17,995 $ 10,391 $ 189,502 $ (220,176 ) $ 176,957 (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 Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 748,310 $ — $ 748,310 Net investment income 10,741 892 1,376 508 107,474 (12,503 ) 108,488 Net foreign exchange (losses) gains (1 ) — — — 11,275 — 11,274 Equity in (losses) earnings of other ventures — — — (450 ) 4,486 — 4,036 Other (loss) income (1 ) — — — 4,058 — 4,057 Net realized and unrealized gains (losses) on investments 45 4,342 4,916 (268 ) 92,451 — 101,486 Total revenues 10,784 5,234 6,292 (210 ) 968,054 (12,503 ) 977,651 Expenses Net claims and claim expenses incurred — — — — 335,668 — 335,668 Acquisition expenses — — — — 171,533 — 171,533 Operational expenses 6,488 40 85 14,626 78,460 (10,650 ) 89,049 Corporate expenses 10,006 — — — (84 ) — 9,922 Interest expense 281 — 2,461 13,143 5,013 (281 ) 20,617 Total expenses 16,775 40 2,546 27,769 590,590 (10,931 ) 626,789 (Loss) income before equity in net income of subsidiaries and taxes (5,991 ) 5,194 3,746 (27,979 ) 377,464 (1,572 ) 350,862 Equity in net income of subsidiaries 280,099 2,306 28,028 36,936 — (347,369 ) — Income before taxes 274,108 7,500 31,774 8,957 377,464 (348,941 ) 350,862 Income tax benefit (expense) 577 (1,682 ) (1,204 ) 5,974 (7,903 ) — (4,238 ) Net income 274,685 5,818 30,570 14,931 369,561 (348,941 ) 346,624 Net income attributable to redeemable noncontrolling interests — — — — (71,939 ) — (71,939 ) Net income attributable to RenaissanceRe 274,685 5,818 30,570 14,931 297,622 (348,941 ) 274,685 Dividends on preference shares (11,191 ) — — — — — (11,191 ) Net income available to RenaissanceRe common shareholders $ 263,494 $ 5,818 $ 30,570 $ 14,931 $ 297,622 $ (348,941 ) $ 263,494 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income for the six months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 274,685 $ 5,818 $ 30,570 $ 14,931 $ 369,561 $ (348,941 ) $ 346,624 Change in net unrealized gains on investments — — — — (1,272 ) — (1,272 ) Comprehensive income 274,685 5,818 30,570 14,931 368,289 (348,941 ) 345,352 Net income attributable to redeemable noncontrolling interests — — — — (71,939 ) — (71,939 ) Comprehensive income attributable to noncontrolling interests — — — — (71,939 ) — (71,939 ) Comprehensive income available to RenaissanceRe $ 274,685 $ 5,818 $ 30,570 $ 14,931 $ 296,350 $ (348,941 ) $ 273,413 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 351,402 $ — $ 351,402 Net investment income 5,749 445 846 141 52,826 (5,883 ) 54,124 Net foreign exchange losses (1 ) — — — (689 ) — (690 ) Equity in earnings of other ventures — — — — 6,022 — 6,022 Other (loss) income (791 ) — — — 3,445 — 2,654 Net realized and unrealized gains on investments 799 1,139 3,414 — 64,420 — 69,772 Total revenues 5,756 1,584 4,260 141 477,426 (5,883 ) 483,284 Expenses — — Net claims and claim expenses incurred — — — — 167,750 — 167,750 Acquisition expenses — — — — 69,005 — 69,005 Operational expenses (1,104 ) 44 64 4,573 50,352 (2,856 ) 51,073 Corporate expenses 5,181 203 — 7 361 — 5,752 Interest expense 141 — 1,477 6,544 2,515 (141 ) 10,536 Total expenses 4,218 247 1,541 11,124 289,983 (2,997 ) 304,116 Income (loss) before equity in net income of subsidiaries and taxes 1,538 1,337 2,719 (10,983 ) 187,443 (2,886 ) 179,168 Equity in net income of subsidiaries 141,677 1,666 12,086 17,165 — (172,594 ) — Income before taxes 143,215 3,003 14,805 6,182 187,443 (175,480 ) 179,168 Income tax (expense) benefit (1,294 ) (906 ) (838 ) 2,792 (6,366 ) — (6,612 ) Net income 141,921 2,097 13,967 8,974 181,077 (175,480 ) 172,556 Net income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Net income attributable to RenaissanceRe 141,921 2,097 13,967 8,974 150,442 (175,480 ) 141,921 Dividends on preference shares (5,596 ) — — — — — (5,596 ) Net income available to RenaissanceRe common shareholders $ 136,325 $ 2,097 $ 13,967 $ 8,974 $ 150,442 $ (175,480 ) $ 136,325 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income for the three months ended June 30, 2016 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 141,921 $ 2,097 $ 13,967 $ 8,974 $ 181,077 $ (175,480 ) $ 172,556 Change in net unrealized gains on investments — — — — 672 — 672 Comprehensive income 141,921 2,097 13,967 8,974 181,749 (175,480 ) 173,228 Net income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Comprehensive income attributable to RenaissanceRe $ 141,921 $ 2,097 $ 13,967 $ 8,974 $ 151,114 $ (175,480 ) $ 142,593 (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 the six months ended June 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 705,008 $ — $ 705,008 Net investment income 12,607 954 2,279 281 78,632 (11,766 ) 82,987 Net foreign exchange losses (2 ) — — — (2,380 ) — (2,382 ) Equity in earnings of other ventures — — — — 7,633 — 7,633 Other (loss) income (791 ) — — — 7,524 — 6,733 Net realized and unrealized gains on investments 5,287 2,254 5,378 — 118,506 — 131,425 Total revenues 17,101 3,208 7,657 281 914,923 (11,766 ) 931,404 Expenses Net claims and claim expenses incurred — — — — 294,355 — 294,355 Acquisition expenses — — — — 134,597 — 134,597 Operational expenses (1,805 ) (97 ) 116 11,582 105,448 (7,936 ) 107,308 Corporate expenses 10,794 203 — 7 2,973 — 13,977 Interest expense 281 — 2,953 13,087 5,034 (281 ) 21,074 Total expenses 9,270 106 3,069 24,676 542,407 (8,217 ) 571,311 Income (loss) before equity in net income of subsidiaries and taxes 7,831 3,102 4,588 (24,395 ) 372,516 (3,549 ) 360,093 Equity in net income of subsidiaries 265,215 1,533 34,421 41,644 — (342,813 ) — Income before taxes 273,046 4,635 39,009 17,249 372,516 (346,362 ) 360,093 Income tax benefit (expense) 2,465 (1,467 ) (1,182 ) 5,671 (14,843 ) — (9,356 ) Net income 275,511 3,168 37,827 22,920 357,673 (346,362 ) 350,737 Net income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Net income attributable to RenaissanceRe 275,511 3,168 37,827 22,920 282,447 (346,362 ) 275,511 Dividends on preference shares (11,191 ) — — — — — (11,191 ) Net income available to RenaissanceRe common shareholders $ 264,320 $ 3,168 $ 37,827 $ 22,920 $ 282,447 $ (346,362 ) $ 264,320 (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 for the six months ended June 20, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 275,511 $ 3,168 $ 37,827 $ 22,920 $ 357,673 $ (346,362 ) $ 350,737 Change in net unrealized gains on investments — — — — 229 — 229 Comprehensive income 275,511 3,168 37,827 22,920 357,902 (346,362 ) 350,966 Net income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Comprehensive income available to RenaissanceRe $ 275,511 $ 3,168 $ 37,827 $ 22,920 $ 282,676 $ (346,362 ) $ 275,740 (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 for the six months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (11,924 ) $ (8,931 ) $ (5,017 ) $ (27,713 ) $ 394,608 $ 341,023 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 53,654 46,475 289,741 15,449 4,758,653 5,163,972 Purchases of fixed maturity investments trading (105,523 ) (45,174 ) (143,991 ) (265,787 ) (4,890,887 ) (5,451,362 ) Net (purchases) sales of equity investments trading — (89 ) 85,324 — (38,930 ) 46,305 Net sales (purchases) of short term investments 298,768 (1,351 ) 41,299 (28,934 ) (33,707 ) 276,075 Net sales of other investments — — — — 2,551 2,551 Dividends and return of capital from subsidiaries 167,111 9,175 — 17,975 (194,261 ) — Contributions to subsidiaries (200,000 ) — — (9,175 ) 209,175 — Due (from) to subsidiary (12,477 ) 9 (41 ) 1,278 11,231 — Net cash provided by (used in) investing activities 201,533 9,045 272,332 (269,194 ) (176,175 ) 37,541 Cash flows (used in) provided by financing activities Dividends paid – RenaissanceRe common shares (25,877 ) — — — — (25,877 ) Dividends paid – preference shares (11,191 ) — — — — (11,191 ) RenaissanceRe common share repurchases (145,940 ) — — — — (145,940 ) Issuance of debt, net of expenses — — — 295,866 — 295,866 Repayment of debt — — (250,000 ) — — (250,000 ) Net third party redeemable noncontrolling interest share transactions — — — — (33,655 ) (33,655 ) Taxes paid on withholding shares (11,251 ) — — — — (11,251 ) Net cash (used in) provided by financing activities (194,259 ) — (250,000 ) 295,866 (33,655 ) (182,048 ) Effect of exchange rate changes on foreign currency cash — — — — 5,477 5,477 Net (decrease) increase in cash and cash equivalents (4,650 ) 114 17,315 (1,041 ) 190,255 201,993 Cash and cash equivalents, beginning of period 7,067 162 6,671 9,397 397,860 421,157 Cash and cash equivalents, end of period $ 2,417 $ 276 $ 23,986 $ 8,356 $ 588,115 $ 623,150 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) RenaissanceRe Consolidated Cash flows provided by (used in)operating activities Net cash provided by (used in) operating activities $ (11,131 ) $ 297 $ (3,914 ) $ (24,197 ) $ 164,186 $ 125,241 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 210,933 50,890 67,839 — 4,450,744 4,780,406 Purchases of fixed maturity investments trading (324,462 ) (105,772 ) (203,883 ) — (4,350,703 ) (4,984,820 ) Proceeds from sales and maturities of fixed maturity investments available for sale — — — — 5,216 5,216 Net (purchases) sales of equity investments trading — (2,195 ) 193,207 — (9,378 ) 181,634 Net sales (purchases) of short term investments 195,915 62,403 (58,367 ) — 45,948 245,899 Net purchases of other investments — — — — (52,778 ) (52,778 ) Dividends and return of capital from subsidiaries 341,011 2,900 — — (343,911 ) — Contributions to subsidiaries (95,001 ) — — — 95,001 — Due to (from) subsidiaries (22,676 ) (14,396 ) (92 ) 24,134 13,030 — Net cash provided by (used in) investing activities 305,720 (6,170 ) (1,296 ) 24,134 (146,831 ) 175,557 Cash flows used in financing activities Dividends paid – RenaissanceRe common shares (26,198 ) — — — — (26,198 ) Dividends paid – preference shares (11,191 ) — — — — (11,191 ) RenaissanceRe common share repurchases (265,003 ) — — — — (265,003 ) Net third party redeemable noncontrolling interest share transactions — — — — (43,909 ) (43,909 ) Taxes paid on withholding shares — — — — (8,069 ) (8,069 ) Net cash used in financing activities (302,392 ) — — — (51,978 ) (354,370 ) Effect of exchange rate changes on foreign currency cash — — — — 2,208 2,208 Net decrease in cash and cash equivalents (7,803 ) (5,873 ) (5,210 ) (63 ) (32,415 ) (51,364 ) Cash and cash equivalents, beginning of period 10,185 5,908 7,103 677 483,012 506,885 Cash and cash equivalents, end of period $ 2,382 $ 35 $ 1,893 $ 614 $ 450,597 $ 455,521 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Subsequent to June 30, 2017 and through the period ended July 21, 2017 , the Company repurchased 15 thousand common shares in open market transactions at an aggregate cost of $2.1 million and at an average share price of $139.93 . During July 2017, RenaissanceRe purchased $12.0 million of DaVinciRe’s outstanding shares from an existing third party shareholder. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 23.5% , effective July 1, 2017.

Significant Accounting Polici24

Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	BASIS OF PRESENTATION These 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. 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.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 was issued to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and the classification of taxes paid on the statements of cash flows. ASU 2016-09 became effective for the Company in annual and interim periods beginning after December 15, 2016. The cumulative effect of the adoption of ASU 2016-09 was a $2.2 million increase to opening retained earnings as of January 1, 2017. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED Revenue from Contracts with Customers In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 provides comprehensive guidance on the recognition of revenue from customers arising from the transfer of goods and services. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also provides guidance on accounting for certain contract costs and will also require new disclosures. ASU 2014-09 was to be effective for public business entities in annual and interim periods beginning after December 15, 2016, however in July 2015, the FASB decided to defer by one year the effective dates of ASU 2014-09, and as a result, ASU 2014-09 will be effective for public business entities in annual and interim periods beginning after December 15, 2017. Early adoption is permitted. 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. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous guidance. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early application is permitted. 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. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option, requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets. ASU 2016-01 is effective for public business entities in annual and interim periods beginning after December 15, 2017. Earlier adoption is generally not permitted, except for certain specific provisions of ASU 2016-01. 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. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 modifies the recognition of credit losses by replacing the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is applicable to financial assets such as loans, debt securities, trade receivables, off-balance sheet credit exposures, reinsurance receivables, and other financial assets that have the contractual right to receive cash. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. The Company's invested assets are measured at fair value through net income, and therefore those invested assets would not be impacted by the adoption of ASU 2016-13. The Company has other financial assets, such as reinsurance recoverables, that could be impacted by the adoption of ASU 2016-13. ASU 2016-13 is effective for public business entities that are SEC filers for annual and interim periods beginning after December 15, 2019. 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. Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 clarifies the classification of receipts and payments in the statement of cash flows. ASU 2016-15 provides guidance related to (1) settlement and payment of zero coupon debt instruments, (2) contingent consideration, (3) proceeds from settlement of insurance claims, (4) proceeds from settlement of corporate and bank owned life insurance policies, (5) distributions from equity method investees, (6) cash receipts from beneficial interests obtained by a transferor, and (7) general guidelines for cash receipts and payments that have more than one aspect of classification. ASU 2016-15 is effective for public business entities for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. 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 cash flows. Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). ASU 2016-16 requires entities to recognize the income tax consequences of intra-entity transfers of assets other than inventory when the transfers occur; this is a change from current guidance which prohibits the recognition of current and deferred income taxes until the underlying assets have been sold to outside entities. ASU 2016-16 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. 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. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). Among other things, ASU 2017-04 requires the following: (1) the elimination of step 2 of the goodwill impairment test; entities will no longer utilize the implied fair value of their assets and liabilities for purposes of testing goodwill for impairment, (2) the quantitative portion of the goodwill impairment test will be performed by comparing the fair value of a reporting unit with its carrying amount; an impairment charge is to be recognized for the excess of carrying amount over fair value, but only to the extent of the amount of goodwill allocated to that reporting unit, and (3) foreign currency translation adjustments are not to be allocated to a reporting unit from an entity’s accumulated other comprehensive income; the reporting unit’s carrying amount should include only the currently translated balances of the assets and liabilities assigned to the reporting unit. ASU 2017-04 is effective for public business entities that are SEC filers for annual periods, or any interim goodwill impairment tests in annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. 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.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
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, U.S. treasuries $ 2,826,681 $ 2,617,894 Agencies 83,343 90,972 Municipal 518,912 519,069 Non-U.S. government (Sovereign debt) 173,667 333,224 Non-U.S. government-backed corporate 74,620 133,300 Corporate 2,186,040 1,877,243 Agency mortgage-backed 567,560 462,493 Non-agency mortgage-backed 275,268 258,944 Commercial mortgage-backed 384,610 409,747 Asset-backed 191,563 188,358 Total fixed maturity investments trading $ 7,282,264 $ 6,891,244
Schedule of Contractual Maturities of Fixed Maturity Investments	Contractual maturities of fixed maturity investments trading are described in the following table. 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. June 30, 2017 Amortized Cost Fair Value Due in less than one year $ 428,307 $ 427,683 Due after one through five years 4,112,662 4,111,191 Due after five through ten years 1,137,632 1,153,811 Due after ten years 168,920 170,578 Mortgage-backed 1,218,486 1,227,438 Asset-backed 191,013 191,563 Total $ 7,257,020 $ 7,282,264
Schedule of Fair Value of Equity Investments Trading	The following table summarizes the fair value of equity investments trading: June 30, December 31, Financials $ 272,982 $ 275,065 Communications and technology 42,316 36,770 Industrial, utilities and energy 31,852 30,303 Consumer 22,078 20,501 Healthcare 20,087 17,245 Basic materials 4,090 3,429 Total $ 393,405 $ 383,313
Schedule of Net Investment Income	The components of net investment income are as follows: Three months ended Six months ended June 30, June 30, June 30, June 30, Fixed maturity investments $ 44,356 $ 46,091 $ 87,775 $ 82,097 Short term investments 2,981 1,227 4,705 2,227 Equity investments 889 865 1,700 2,528 Other investments Private equity investments 6,611 4,356 14,413 (5,002 ) Other 2,899 5,035 6,971 8,344 Cash and cash equivalents 295 209 484 338 58,031 57,783 116,048 90,532 Investment expenses (3,868 ) (3,659 ) (7,560 ) (7,545 ) Net investment income $ 54,163 $ 54,124 $ 108,488 $ 82,987
Schedule of Net Realized and Unrealized Gains On Investments	Net realized and unrealized gains on investments are as follows: Three months ended Six months ended June 30, June 30, June 30, June 30, Gross realized gains $ 15,249 $ 22,661 $ 26,710 $ 40,411 Gross realized losses (7,243 ) (7,804 ) (23,776 ) (22,469 ) Net realized gains on fixed maturity investments 8,006 14,857 2,934 17,942 Net unrealized gains on fixed maturity investments trading 18,760 44,271 43,395 129,736 Net realized and unrealized losses on investments-related derivatives (268 ) (9,151 ) (324 ) (28,600 ) Net realized gains on equity investments trading 15,146 14,729 36,061 13,911 Net unrealized gains (losses) on equity investments trading 16,469 5,066 19,420 (1,564 ) Net realized and unrealized gains on investments $ 58,113 $ 69,772 $ 101,486 $ 131,425

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
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, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,826,681 $ 2,826,681 $ — $ — Agencies 83,343 — 83,343 — Municipal 518,912 — 518,912 — Non-U.S. government (Sovereign debt) 173,667 — 173,667 — Non-U.S. government-backed corporate 74,620 — 74,620 — Corporate 2,186,040 — 2,186,040 — Agency mortgage-backed 567,560 — 567,560 — Non-agency mortgage-backed 275,268 — 275,268 — Commercial mortgage-backed 384,610 — 384,610 — Asset-backed 191,563 — 191,563 — Total fixed maturity investments 7,282,264 2,826,681 4,455,583 — Short term investments 1,070,950 — 1,070,950 — Equity investments trading 393,405 393,405 — — Other investments Catastrophe bonds 348,353 — 348,353 — Private equity partnerships (1) 194,331 — — — Senior secured bank loan funds (1) 17,321 — — — Hedge funds (1) 1,207 — — — Total other investments 561,212 — 348,353 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (9,502 ) — — (9,502 ) Derivatives (3) 6,391 210 6,181 — Other (5,355 ) — (5,355 ) — Total other assets and (liabilities) (8,466 ) 210 826 (9,502 ) $ 9,299,365 $ 3,220,296 $ 5,875,712 $ (9,502 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at June 30, 2017 was $5.8 million and $15.3 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,617,894 $ 2,617,894 $ — $ — Agencies 90,972 — 90,972 — Municipal 519,069 — 519,069 — Non-U.S. government (Sovereign debt) 333,224 — 333,224 — Non-U.S. government-backed corporate 133,300 — 133,300 — Corporate 1,877,243 — 1,877,243 — Agency mortgage-backed 462,493 — 462,493 — Non-agency mortgage-backed 258,944 — 258,944 — Commercial mortgage-backed 409,747 — 409,747 — Asset-backed 188,358 — 188,358 — Total fixed maturity investments 6,891,244 2,617,894 4,273,350 — Short term investments 1,368,379 — 1,368,379 — Equity investments trading 383,313 383,313 — — Other investments Catastrophe bonds 335,209 — 335,209 — Private equity partnerships (1) 191,061 — — — Senior secured bank loan funds (1) 22,040 — — — Hedge funds (1) 1,495 — — — Total other investments 549,805 — 335,209 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (13,004 ) — — (13,004 ) Derivatives (3) (8,922 ) (646 ) (8,276 ) — Other (13,105 ) — (13,105 ) — Total other assets and (liabilities) (35,031 ) (646 ) (21,381 ) (13,004 ) $ 9,157,710 $ 3,000,561 $ 5,955,557 $ (13,004 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at December 31, 2016 was $4.4 million and $17.4 million of other assets and other liabilities, respectively. (3) See “Note 13 . 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, 2017 Fair Value (Level 3) Valuation Technique Unobservable (U) and Observable (O) Inputs Low High Weighted Average or Actual Other assets and (liabilities) Assumed and ceded (re)insurance contracts $ 809 Internal valuation model Bond price (U) $ 101.59 $ 111.15 $ 106.94 Liquidity discount (U) n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (10,311 ) Internal valuation model Net undiscounted cash flows (U) n/a n/a $ (12,715 ) Expected loss ratio (U) n/a n/a 30.6 % Net acquisition expense ratio (O) n/a n/a (17.4 )% Contract period (O) 2.0 years 4.7 years 4.5 years Discount rate (U) n/a n/a 1.9 % Total other assets and (liabilities) $ (9,502 )
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. Other assets and (liabilities) Balance - April 1, 2017 $ (12,135 ) Total realized and unrealized gains Included in other income 2,319 Purchases 314 Balance - June 30, 2017 $ (9,502 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,390 Purchases 112 Balance - June 30, 2017 $ (9,502 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - April 1, 2016 $ 7,500 $ (4,724 ) $ 2,776 Total realized and unrealized gains Included in other income — 2,092 2,092 Purchases — (48 ) (48 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 3,792 3,792 Purchases — (573 ) (573 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 )
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. Other assets and (liabilities) Balance - April 1, 2017 $ (12,135 ) Total realized and unrealized gains Included in other income 2,319 Purchases 314 Balance - June 30, 2017 $ (9,502 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,390 Purchases 112 Balance - June 30, 2017 $ (9,502 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - April 1, 2016 $ 7,500 $ (4,724 ) $ 2,776 Total realized and unrealized gains Included in other income — 2,092 2,092 Purchases — (48 ) (48 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 3,792 3,792 Purchases — (573 ) (573 ) Settlements (7,500 ) — (7,500 ) Balance - June 30, 2016 $ — $ (2,680 ) $ (2,680 )
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, Other investments $ 561,212 $ 549,805 Other assets $ 5,756 $ 4,379 Other liabilities $ 15,258 $ 17,383
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 as a practical expedient: At June 30, 2017 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity partnerships $ 194,331 $ 310,367 See below See below See below Senior secured bank loan funds 17,321 26,102 See below See below See below Hedge funds 1,207 — See below See below See below Total other investments measured using net asset valuations $ 212,859 $ 336,469

Reinsurance (Tables)

Reinsurance (Tables)	6 Months Ended
	Jun. 30, 2017
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 Six months ended June 30, June 30, June 30, June 30, Premiums written Direct $ 67,805 $ 57,541 $ 141,213 $ 100,717 Assumed 759,610 701,587 1,608,292 1,520,544 Ceded (271,670 ) (239,212 ) (649,624 ) (589,670 ) Net premiums written $ 555,745 $ 519,916 $ 1,099,881 $ 1,031,591 Premiums earned Direct $ 56,357 $ 37,936 $ 114,525 $ 71,076 Assumed 520,347 464,540 1,019,346 921,181 Ceded (194,439 ) (151,074 ) (385,561 ) (287,249 ) Net premiums earned $ 382,265 $ 351,402 $ 748,310 $ 705,008 Claims and claim expenses Gross claims and claim expenses incurred $ 189,903 $ 224,852 $ 441,707 $ 386,850 Claims and claim expenses recovered (47,316 ) (57,102 ) (106,039 ) (92,495 ) Net claims and claim expenses incurred $ 142,587 $ 167,750 $ 335,668 $ 294,355

Reserve for Claims and Claim 28

Reserve for Claims and Claim Expenses (Tables)	6 Months Ended
	Jun. 30, 2017
Insurance Loss Reserves [Abstract]
Schedule of Liability for Unpaid Claims and Claim Expenses	The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Actuarial methods - actual reported claims lower than expected claims $ (21,762 ) $ (5,755 ) Ogden Rate change 33,481 — Actuarial assumption changes (2,462 ) (6,118 ) Total adverse (favorable) development of prior accident years net claims and claim expenses $ 9,257 $ (11,873 ) The following table details the Company’s prior year development by segment of its liability for unpaid claims and claim expenses: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Property $ (24,800 ) $ (18,989 ) Casualty and Specialty 9,257 (11,873 ) Other (555 ) 3 Total favorable development of prior accident years net claims and claim expenses $ (16,098 ) $ (30,859 ) The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR: At June 30, 2017 Case Reserves Additional Case Reserves IBNR Total Property $ 221,898 $ 167,510 $ 216,163 $ 605,571 Casualty and Specialty 635,834 111,021 1,619,915 2,366,770 Other 2,532 — 14,933 17,465 Total $ 860,264 $ 278,531 $ 1,851,011 $ 2,989,806 At December 31, 2016 Property $ 214,954 $ 186,308 $ 226,512 $ 627,774 Casualty and Specialty 591,705 105,419 1,498,002 2,195,126 Other 6,935 — 18,459 25,394 Total $ 813,594 $ 291,727 $ 1,742,973 $ 2,848,294 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Six months ended June 30, 2017 2016 Net reserves as of January 1 $ 2,568,730 $ 2,632,519 Net incurred related to: Current year 351,766 325,214 Prior years (16,098 ) (30,859 ) Total net incurred 335,668 294,355 Net paid related to: Current year 19,885 11,070 Prior years 285,046 297,716 Total net paid 304,931 308,786 Foreign exchange 19,753 4,149 Net reserves as of June 30 2,619,220 2,622,237 Reinsurance recoverable as of June 30 370,586 222,006 Gross reserves as of June 30 $ 2,989,806 $ 2,844,243 The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item: Six months ended June 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events New Zealand Earthquake (2011) $ 5,807 $ — New Zealand Earthquake (2010) 4,061 2,962 April and May U.S. Tornadoes (2011) (4,153 ) (1,408 ) Other (3,864 ) (500 ) Total large catastrophe events 1,851 1,054 Small catastrophe events Fort McMurray Wildfire (2016) (5,848 ) — Tianjin Explosion (2015) (4,896 ) — U.S. PCS 13/14 Wind and Thunderstorm (2013) (3,906 ) (6,260 ) Other (12,844 ) (13,783 ) Total small catastrophe events (27,494 ) (20,043 ) Total catastrophe net claims and claim expenses (25,643 ) (18,989 ) Actuarial assumption changes 843 — Total net favorable development of prior accident years net claims and claim expenses $ (24,800 ) $ (18,989 )

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below: June 30, 2017 December 31, 2016 Fair Value Carrying Value Fair Value Carrying Value 3.450% Senior Notes due 2027 $ 296,400 $ 295,053 $ — $ — 3.700% Senior Notes due 2025 300,327 297,132 291,750 296,948 5.75% Senior Notes due 2020 268,228 249,106 270,875 248,941 Series B 7.50% Senior Notes due 2017 — — 257,500 255,352 4.750% Senior Notes due 2025 (DaVinciRe) (1) 156,386 147,575 144,675 147,422 $ 1,021,341 $ 988,866 $ 964,800 $ 948,663 (1) RenaissanceRe owns a noncontrolling economic interest in its joint venture DaVinciRe. 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 RenaissanceRe. However, RenaissanceRe does not guarantee or provide credit support for DaVinciRe and RenaissanceRe’s financial exposure to DaVinciRe is limited to its investment in DaVinciRe’s shares and counterparty credit risk arising from reinsurance transactions.
Schedule of Line of Credit Facilities	The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below: At June 30, 2017 Issued or Drawn RenaissanceRe Revolving Credit Facility $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 105,892 Uncommitted Standby Letter of Credit Facility with NAB 4,525 Bilateral Letter of Credit Facility with Citibank Europe 206,383 Funds at Lloyd’s Letter of Credit Facilities Renaissance Reinsurance FAL Facility 180,000 Total credit facilities in U.S. dollars $ 496,800 Funds at Lloyd’s Letter of Credit Facilities Specialty Risks FAL Facility £ 10,000 Total credit facilities in British Pounds £ 10,000

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Schedule Of Redeemable Noncontrolling Interest	The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below: Three months ended Six months ended June 30, June 30, June 30, June 30, Beginning balance $ 986,646 $ 926,141 $ 994,458 $ 930,955 Redemption of shares from redeemable noncontrolling interest (3,160 ) (986 ) (66,802 ) (91,804 ) Sale of shares to redeemable noncontrolling interests — — 23,921 43,040 Net income attributable to redeemable noncontrolling interest 36,432 28,288 68,341 71,252 Ending balance $ 1,019,918 $ 953,443 $ 1,019,918 $ 953,443 A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below: June 30, December 31, 2016 Redeemable noncontrolling interest - DaVinciRe $ 1,019,918 $ 994,458 Redeemable noncontrolling interest - Medici 222,165 181,136 Redeemable noncontrolling interests $ 1,242,083 $ 1,175,594 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations set forth below: Three months ended Six months ended June 30, June 30, June 30, June 30, Redeemable noncontrolling interest - DaVinciRe $ 36,432 $ 28,288 $ 68,341 $ 71,252 Redeemable noncontrolling interest - Medici 1,180 2,347 3,598 3,974 Net income attributable to redeemable noncontrolling interests $ 37,612 $ 30,635 $ 71,939 $ 75,226 The activity in redeemable noncontrolling interest – Medici is detailed in the table below: Three months ended Six months ended June 30, June 30, June 30, June 30, Beginning balance $ 201,345 $ 155,196 $ 181,136 $ 115,009 Redemption of shares from redeemable noncontrolling interest (15,285 ) (6,400 ) (25,910 ) (7,340 ) Sale of shares to redeemable noncontrolling interests 34,925 17,817 63,341 57,317 Net income attributable to redeemable noncontrolling interest 1,180 2,347 3,598 3,974 Ending balance $ 222,165 $ 168,960 $ 222,165 $ 168,960

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
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 Six months ended (common shares in thousands) June 30, June 30, June 30, June 30, Numerator: Net income available to RenaissanceRe common shareholders $ 171,142 $ 136,325 $ 263,494 $ 264,320 Amount allocated to participating common shareholders (1) (1,585 ) (1,561 ) (2,526 ) (3,166 ) Net income allocated to RenaissanceRe common shareholders $ 169,557 $ 134,764 $ 260,968 $ 261,154 Denominator: Denominator for basic income per RenaissanceRe common share - weighted average common shares 39,937 41,693 40,172 42,135 Per common share equivalents of employee stock options and restricted shares 87 192 152 263 Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 40,024 41,885 40,324 42,398 Net income available to RenaissanceRe common shareholders per common share – basic $ 4.25 $ 3.23 $ 6.50 $ 6.20 Net income available to RenaissanceRe common shareholders per common share – diluted $ 4.24 $ 3.22 $ 6.47 $ 6.16 (1) Represents earnings attributable to holders of unvested restricted shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2010 Performance-Based Equity Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2017
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, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 499,347 $ 328,068 $ — $ 827,415 Net premiums written $ 336,464 $ 219,281 $ — $ 555,745 Net premiums earned $ 192,198 $ 190,065 $ 2 $ 382,265 Net claims and claim expenses incurred 33,017 109,797 (227 ) 142,587 Acquisition expenses 28,500 59,752 (1 ) 88,251 Operational expenses 24,053 17,712 1 41,766 Underwriting income $ 106,628 $ 2,804 $ 229 109,661 Net investment income 54,163 54,163 Net foreign exchange gains 3,109 3,109 Equity in earnings of other ventures 5,543 5,543 Other income 2,392 2,392 Net realized and unrealized gains on investments 58,113 58,113 Corporate expenses (4,636 ) (4,636 ) Interest expense (10,091 ) (10,091 ) Income before taxes and redeemable noncontrolling interests 218,254 Income tax expense (3,904 ) (3,904 ) Net income attributable to redeemable noncontrolling interests (37,612 ) (37,612 ) Dividends on preference shares (5,596 ) (5,596 ) Net income available to RenaissanceRe common shareholders $ 171,142 Net claims and claim expenses incurred – current accident year $ 56,889 $ 130,802 $ — $ 187,691 Net claims and claim expenses incurred – prior accident years (23,872 ) (21,005 ) (227 ) (45,104 ) Net claims and claim expenses incurred – total $ 33,017 $ 109,797 $ (227 ) $ 142,587 Net claims and claim expense ratio – current accident year 29.6 % 68.8 % 49.1 % Net claims and claim expense ratio – prior accident years (12.4 )% (11.0 )% (11.8 )% Net claims and claim expense ratio – calendar year 17.2 % 57.8 % 37.3 % Underwriting expense ratio 27.3 % 40.7 % 34.0 % Combined ratio 44.5 % 98.5 % 71.3 % Six months ended June 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 1,019,876 $ 729,629 $ — $ 1,749,505 Net premiums written $ 626,335 $ 473,546 $ — $ 1,099,881 Net premiums earned $ 379,186 $ 369,124 $ — $ 748,310 Net claims and claim expenses incurred 71,855 264,368 (555 ) 335,668 Acquisition expenses 57,603 113,931 (1 ) 171,533 Operational expenses 51,718 37,319 12 89,049 Underwriting income (loss) $ 198,010 $ (46,494 ) $ 544 152,060 Net investment income 108,488 108,488 Net foreign exchange gains 11,274 11,274 Equity in earnings of other ventures 4,036 4,036 Other income 4,057 4,057 Net realized and unrealized gains on investments 101,486 101,486 Corporate expenses (9,922 ) (9,922 ) Interest expense (20,617 ) (20,617 ) Income before taxes and redeemable noncontrolling interests 350,862 Income tax expense (4,238 ) (4,238 ) Net income attributable to redeemable noncontrolling interests (71,939 ) (71,939 ) Dividends on preference shares (11,191 ) (11,191 ) Net income available to RenaissanceRe common shareholders $ 263,494 Net claims and claim expenses incurred – current accident year $ 96,655 $ 255,111 $ — $ 351,766 Net claims and claim expenses incurred – prior accident years (24,800 ) 9,257 (555 ) (16,098 ) Net claims and claim expenses incurred – total $ 71,855 $ 264,368 $ (555 ) $ 335,668 Net claims and claim expense ratio – current accident year 25.5 % 69.1 % 47.0 % Net claims and claim expense ratio – prior accident years (6.6 )% 2.5 % (2.1 )% Net claims and claim expense ratio – calendar year 18.9 % 71.6 % 44.9 % Underwriting expense ratio 28.9 % 41.0 % 34.8 % Combined ratio 47.8 % 112.6 % 79.7 % Three months ended June 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 493,953 $ 265,175 $ — $ 759,128 Net premiums written $ 350,593 $ 169,323 $ — $ 519,916 Net premiums earned $ 191,060 $ 160,342 $ — $ 351,402 Net claims and claim expenses incurred 80,275 87,390 85 167,750 Acquisition expenses 29,389 39,616 — 69,005 Operational expenses 26,526 24,526 21 51,073 Underwriting income (loss) $ 54,870 $ 8,810 $ (106 ) 63,574 Net investment income 54,124 54,124 Net foreign exchange losses (690 ) (690 ) Equity in earnings of other ventures 6,022 6,022 Other income 2,654 2,654 Net realized and unrealized gains on investments 69,772 69,772 Corporate expenses (5,752 ) (5,752 ) Interest expense (10,536 ) (10,536 ) Income before taxes and noncontrolling interests 179,168 Income tax expense (6,612 ) (6,612 ) Net income attributable to noncontrolling interests (30,635 ) (30,635 ) Dividends on preference shares (5,596 ) (5,596 ) Net income available to RenaissanceRe common shareholders $ 136,325 Net claims and claim expenses incurred – current accident year $ 93,336 $ 103,669 $ — $ 197,005 Net claims and claim expenses incurred – prior accident years (13,061 ) (16,279 ) 85 (29,255 ) Net claims and claim expenses incurred – total $ 80,275 $ 87,390 $ 85 $ 167,750 Net claims and claim expense ratio – current accident year 48.9 % 64.7 % 56.1 % Net claims and claim expense ratio – prior accident years (6.9 )% (10.2 )% (8.4 )% Net claims and claim expense ratio – calendar year 42.0 % 54.5 % 47.7 % Underwriting expense ratio 29.3 % 40.0 % 34.2 % Combined ratio 71.3 % 94.5 % 81.9 % Six months ended June 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 938,912 $ 682,349 $ — $ 1,621,261 Net premiums written $ 583,452 $ 448,139 $ — $ 1,031,591 Net premiums earned $ 366,292 $ 338,716 $ — $ 705,008 Net claims and claim expenses incurred 102,079 192,273 3 294,355 Acquisition expenses 49,513 85,084 — 134,597 Operational expenses 55,183 52,044 81 107,308 Underwriting income (loss) $ 159,517 $ 9,315 $ (84 ) 168,748 Net investment income 82,987 82,987 Net foreign exchange losses (2,382 ) (2,382 ) Equity in earnings of other ventures 7,633 7,633 Other income 6,733 6,733 Net realized and unrealized gains on investments 131,425 131,425 Corporate expenses (13,977 ) (13,977 ) Interest expense (21,074 ) (21,074 ) Income before taxes and noncontrolling interests 360,093 Income tax expense (9,356 ) (9,356 ) Net income attributable to noncontrolling interests (75,226 ) (75,226 ) Dividends on preference shares (11,191 ) (11,191 ) Net income available to RenaissanceRe common shareholders $ 264,320 Net claims and claim expenses incurred – current accident year $ 121,068 $ 204,146 $ — $ 325,214 Net claims and claim expenses incurred – prior accident years (18,989 ) (11,873 ) 3 (30,859 ) Net claims and claim expenses incurred – total $ 102,079 $ 192,273 $ 3 $ 294,355 Net claims and claim expense ratio – current accident year 33.1 % 60.3 % 46.1 % Net claims and claim expense ratio – prior accident years (5.2 )% (3.5 )% (4.3 )% Net claims and claim expense ratio – calendar year 27.9 % 56.8 % 41.8 % Underwriting expense ratio 28.6 % 40.4 % 34.3 % Combined ratio 56.5 % 97.2 % 76.1 %

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
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 at fair value, including the location on the consolidated balance sheets of the Company’s principal derivative instruments: Derivative Assets At June 30, 2017 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 $ 1,277 973 $ 304 Other assets $ — $ 304 Foreign currency forward contracts (1) 7,245 617 6,628 Other assets — 6,628 Foreign currency forward contracts (2) 57 18 39 Other assets — 39 Credit default swaps 2,502 19 2,483 Other assets — 2,483 Total $ 11,081 $ 1,627 $ 9,454 $ — $ 9,454 Derivative Liabilities At June 30, 2017 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 $ 1,067 973 $ 94 Other liabilities $ 94 $ — Foreign currency forward contracts (1) 2,273 — 2,273 Other liabilities — 2,273 Foreign currency forward contracts (2) 97 18 79 Other liabilities — 79 Credit default swaps 636 19 617 Other liabilities — 617 Total $ 4,073 $ 1,010 $ 3,063 $ 94 $ 2,969 (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, 2016 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 $ 1,384 1,235 $ 149 Other assets $ — $ 149 Foreign currency forward contracts (1) 774 — 774 Other assets — 774 Foreign currency forward contracts (2) 621 447 174 Other assets — 174 Credit default swaps 1,429 23 1,406 Other assets — 1,406 Total $ 4,208 $ 1,705 $ 2,503 $ — $ 2,503 Derivative Liabilities At December 31, 2016 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 $ 2,030 1,235 $ 795 Other liabilities $ 789 $ 6 Foreign currency forward contracts (1) 10,550 397 10,153 Other liabilities — 10,153 Foreign currency forward contracts (2) 766 447 319 Other liabilities — 319 Credit default swaps 181 23 158 Other liabilities — 158 Total $ 13,527 $ 2,102 $ 11,425 $ 789 $ 10,636 (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) recognized on derivatives Amount of gain (loss) recognized on derivatives Three months ended June 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (890 ) $ (9,456 ) Foreign currency forward contracts (1) Net foreign exchange gains (losses) 5,223 (3,815 ) Foreign currency forward contracts (2) Net foreign exchange gains (losses) (267 ) 2,641 Credit default swaps Net realized and unrealized gains on investments 622 305 Total $ 4,688 $ (10,325 ) Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Six months ended June 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (1,048 ) $ (28,815 ) Foreign currency forward contracts (1) Net foreign exchange gains (losses) 6,283 (5,189 ) Foreign currency forward contracts (2) Net foreign exchange gains (losses) (900 ) (3,217 ) Credit default swaps Net realized and unrealized gains on investments 724 215 Total $ 5,059 $ (37,006 ) (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 Finan34

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Tables)	6 Months Ended
	Jun. 30, 2017
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheet at June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 140,492 $ 123,517 $ — $ 323,094 $ 8,821,805 $ — $ 9,408,908 Cash and cash equivalents 2,417 276 23,986 8,356 588,115 — 623,150 Investments in subsidiaries 4,388,394 36,924 871,117 1,195,266 — (6,491,701 ) — Due from subsidiaries and affiliates 5,489 91,892 — — — (97,381 ) — Premiums receivable — — — — 1,533,833 — 1,533,833 Prepaid reinsurance premiums — — — — 705,322 — 705,322 Reinsurance recoverable — — — — 370,586 — 370,586 Accrued investment income 291 288 — 921 38,618 — 40,118 Deferred acquisition costs — — — — 430,106 — 430,106 Receivable for investments sold 52 5 — — 170,354 — 170,411 Other assets 423,601 37,547 (29 ) 130,139 115,352 (529,794 ) 176,816 Goodwill and other intangible assets 127,532 — — — 118,898 — 246,430 Total assets $ 5,088,268 $ 290,449 $ 895,074 $ 1,657,776 $ 12,892,989 $ (7,118,876 ) $ 13,705,680 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,989,806 $ — $ 2,989,806 Unearned premiums — — — — 1,847,206 — 1,847,206 Debt 117,000 — — 841,290 147,576 (117,000 ) 988,866 Amounts due to subsidiaries and affiliates 243 51 82 97,339 — (97,715 ) — Reinsurance balances payable — — — — 1,052,494 — 1,052,494 Payable for investments purchased — 24 — — 407,288 — 407,312 Other liabilities 15,770 780 (2,757 ) 9,887 206,139 (7,161 ) 222,658 Total liabilities 133,013 855 (2,675 ) 948,516 6,650,509 (221,876 ) 7,508,342 Redeemable noncontrolling interests — — — — 1,242,083 — 1,242,083 Shareholders’ Equity Total shareholders’ equity 4,955,255 289,594 897,749 709,260 5,000,397 (6,897,000 ) 4,955,255 Total liabilities, noncontrolling interests and shareholders’ equity $ 5,088,268 $ 290,449 $ 895,074 $ 1,657,776 $ 12,892,989 $ (7,118,876 ) $ 13,705,680 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Balance Sheet at December 31, 2016 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 387,274 $ 119,163 $ 267,556 $ 45,027 $ 8,497,948 $ — $ 9,316,968 Cash and cash equivalents 7,067 162 6,671 9,397 397,860 — 421,157 Investments in subsidiaries 4,074,769 34,761 843,089 1,165,413 — (6,118,032 ) — Due from subsidiaries and affiliates 7,413 91,892 — — — (99,305 ) — Premiums receivable — — — — 987,323 — 987,323 Prepaid reinsurance premiums — — — — 441,260 — 441,260 Reinsurance recoverable — — — — 279,564 — 279,564 Accrued investment income 105 289 551 106 37,025 — 38,076 Deferred acquisition costs — — — — 335,325 — 335,325 Receivable for investments sold 136 2 99 45 105,559 — 105,841 Other assets 410,757 37,204 4,689 127,572 118,098 (522,938 ) 175,382 Goodwill and other intangible assets 130,407 — — — 120,779 — 251,186 Total assets $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,848,294 $ — $ 2,848,294 Unearned premiums — — — — 1,231,573 — 1,231,573 Debt 117,000 — 255,352 545,889 147,422 (117,000 ) 948,663 Amounts due to subsidiaries and affiliates 14,644 42 123 96,061 — (110,870 ) — Reinsurance balances payable — — — — 673,983 — 673,983 Payable for investments purchased — — — — 305,714 — 305,714 Other liabilities 19,707 10,544 — 13,350 270,610 (12,527 ) 301,684 Total liabilities 151,351 10,586 255,475 655,300 5,477,596 (240,397 ) 6,309,911 Redeemable noncontrolling interests — — — — 1,175,594 — 1,175,594 Shareholders’ Equity Total shareholders’ equity 4,866,577 272,887 867,180 692,260 4,667,551 (6,499,878 ) 4,866,577 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 (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	Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 748,310 $ — $ 748,310 Net investment income 10,741 892 1,376 508 107,474 (12,503 ) 108,488 Net foreign exchange (losses) gains (1 ) — — — 11,275 — 11,274 Equity in (losses) earnings of other ventures — — — (450 ) 4,486 — 4,036 Other (loss) income (1 ) — — — 4,058 — 4,057 Net realized and unrealized gains (losses) on investments 45 4,342 4,916 (268 ) 92,451 — 101,486 Total revenues 10,784 5,234 6,292 (210 ) 968,054 (12,503 ) 977,651 Expenses Net claims and claim expenses incurred — — — — 335,668 — 335,668 Acquisition expenses — — — — 171,533 — 171,533 Operational expenses 6,488 40 85 14,626 78,460 (10,650 ) 89,049 Corporate expenses 10,006 — — — (84 ) — 9,922 Interest expense 281 — 2,461 13,143 5,013 (281 ) 20,617 Total expenses 16,775 40 2,546 27,769 590,590 (10,931 ) 626,789 (Loss) income before equity in net income of subsidiaries and taxes (5,991 ) 5,194 3,746 (27,979 ) 377,464 (1,572 ) 350,862 Equity in net income of subsidiaries 280,099 2,306 28,028 36,936 — (347,369 ) — Income before taxes 274,108 7,500 31,774 8,957 377,464 (348,941 ) 350,862 Income tax benefit (expense) 577 (1,682 ) (1,204 ) 5,974 (7,903 ) — (4,238 ) Net income 274,685 5,818 30,570 14,931 369,561 (348,941 ) 346,624 Net income attributable to redeemable noncontrolling interests — — — — (71,939 ) — (71,939 ) Net income attributable to RenaissanceRe 274,685 5,818 30,570 14,931 297,622 (348,941 ) 274,685 Dividends on preference shares (11,191 ) — — — — — (11,191 ) Net income available to RenaissanceRe common shareholders $ 263,494 $ 5,818 $ 30,570 $ 14,931 $ 297,622 $ (348,941 ) $ 263,494 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 382,265 $ — $ 382,265 Net investment income 5,284 466 535 239 53,891 (6,252 ) 54,163 Net foreign exchange (losses) gains (1 ) — — — 3,110 — 3,109 Equity in earnings of other ventures — — — 302 5,241 — 5,543 Other income — — — — 2,392 — 2,392 Net realized and unrealized (losses) gains on investments (8 ) 1,421 191 (242 ) 56,751 — 58,113 Total revenues 5,275 1,887 726 299 503,650 (6,252 ) 505,585 Expenses Net claims and claim expenses incurred — — — — 142,587 — 142,587 Acquisition expenses — — — — 88,251 — 88,251 Operational expenses 3,190 16 35 6,647 36,402 (4,524 ) 41,766 Corporate expenses 4,798 — — — (162 ) — 4,636 Interest expense 141 — 985 6,601 2,505 (141 ) 10,091 Total expenses 8,129 16 1,020 13,248 269,583 (4,665 ) 287,331 (Loss) income before equity in net income of subsidiaries and taxes (2,854 ) 1,871 (294 ) (12,949 ) 234,067 (1,587 ) 218,254 Equity in net income of subsidiaries 178,746 1,220 18,185 20,438 — (218,589 ) — Income before taxes 175,892 3,091 17,891 7,489 234,067 (220,176 ) 218,254 Income tax benefit (expense) 846 (584 ) 104 2,902 (7,172 ) — (3,904 ) Net income 176,738 2,507 17,995 10,391 226,895 (220,176 ) 214,350 Net income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Net income attributable to RenaissanceRe 176,738 2,507 17,995 10,391 189,283 (220,176 ) 176,738 Dividends on preference shares (5,596 ) — — — — — (5,596 ) Net income available attributable to RenaissanceRe common shareholders $ 171,142 $ 2,507 $ 17,995 $ 10,391 $ 189,283 $ (220,176 ) $ 171,142 (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 the six months ended June 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 705,008 $ — $ 705,008 Net investment income 12,607 954 2,279 281 78,632 (11,766 ) 82,987 Net foreign exchange losses (2 ) — — — (2,380 ) — (2,382 ) Equity in earnings of other ventures — — — — 7,633 — 7,633 Other (loss) income (791 ) — — — 7,524 — 6,733 Net realized and unrealized gains on investments 5,287 2,254 5,378 — 118,506 — 131,425 Total revenues 17,101 3,208 7,657 281 914,923 (11,766 ) 931,404 Expenses Net claims and claim expenses incurred — — — — 294,355 — 294,355 Acquisition expenses — — — — 134,597 — 134,597 Operational expenses (1,805 ) (97 ) 116 11,582 105,448 (7,936 ) 107,308 Corporate expenses 10,794 203 — 7 2,973 — 13,977 Interest expense 281 — 2,953 13,087 5,034 (281 ) 21,074 Total expenses 9,270 106 3,069 24,676 542,407 (8,217 ) 571,311 Income (loss) before equity in net income of subsidiaries and taxes 7,831 3,102 4,588 (24,395 ) 372,516 (3,549 ) 360,093 Equity in net income of subsidiaries 265,215 1,533 34,421 41,644 — (342,813 ) — Income before taxes 273,046 4,635 39,009 17,249 372,516 (346,362 ) 360,093 Income tax benefit (expense) 2,465 (1,467 ) (1,182 ) 5,671 (14,843 ) — (9,356 ) Net income 275,511 3,168 37,827 22,920 357,673 (346,362 ) 350,737 Net income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Net income attributable to RenaissanceRe 275,511 3,168 37,827 22,920 282,447 (346,362 ) 275,511 Dividends on preference shares (11,191 ) — — — — — (11,191 ) Net income available to RenaissanceRe common shareholders $ 264,320 $ 3,168 $ 37,827 $ 22,920 $ 282,447 $ (346,362 ) $ 264,320 (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 Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 351,402 $ — $ 351,402 Net investment income 5,749 445 846 141 52,826 (5,883 ) 54,124 Net foreign exchange losses (1 ) — — — (689 ) — (690 ) Equity in earnings of other ventures — — — — 6,022 — 6,022 Other (loss) income (791 ) — — — 3,445 — 2,654 Net realized and unrealized gains on investments 799 1,139 3,414 — 64,420 — 69,772 Total revenues 5,756 1,584 4,260 141 477,426 (5,883 ) 483,284 Expenses — — Net claims and claim expenses incurred — — — — 167,750 — 167,750 Acquisition expenses — — — — 69,005 — 69,005 Operational expenses (1,104 ) 44 64 4,573 50,352 (2,856 ) 51,073 Corporate expenses 5,181 203 — 7 361 — 5,752 Interest expense 141 — 1,477 6,544 2,515 (141 ) 10,536 Total expenses 4,218 247 1,541 11,124 289,983 (2,997 ) 304,116 Income (loss) before equity in net income of subsidiaries and taxes 1,538 1,337 2,719 (10,983 ) 187,443 (2,886 ) 179,168 Equity in net income of subsidiaries 141,677 1,666 12,086 17,165 — (172,594 ) — Income before taxes 143,215 3,003 14,805 6,182 187,443 (175,480 ) 179,168 Income tax (expense) benefit (1,294 ) (906 ) (838 ) 2,792 (6,366 ) — (6,612 ) Net income 141,921 2,097 13,967 8,974 181,077 (175,480 ) 172,556 Net income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Net income attributable to RenaissanceRe 141,921 2,097 13,967 8,974 150,442 (175,480 ) 141,921 Dividends on preference shares (5,596 ) — — — — — (5,596 ) Net income available to RenaissanceRe common shareholders $ 136,325 $ 2,097 $ 13,967 $ 8,974 $ 150,442 $ (175,480 ) $ 136,325 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive Income for the six months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 274,685 $ 5,818 $ 30,570 $ 14,931 $ 369,561 $ (348,941 ) $ 346,624 Change in net unrealized gains on investments — — — — (1,272 ) — (1,272 ) Comprehensive income 274,685 5,818 30,570 14,931 368,289 (348,941 ) 345,352 Net income attributable to redeemable noncontrolling interests — — — — (71,939 ) — (71,939 ) Comprehensive income attributable to noncontrolling interests — — — — (71,939 ) — (71,939 ) Comprehensive income available to RenaissanceRe $ 274,685 $ 5,818 $ 30,570 $ 14,931 $ 296,350 $ (348,941 ) $ 273,413 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income for the three months ended June 30, 2016 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 141,921 $ 2,097 $ 13,967 $ 8,974 $ 181,077 $ (175,480 ) $ 172,556 Change in net unrealized gains on investments — — — — 672 — 672 Comprehensive income 141,921 2,097 13,967 8,974 181,749 (175,480 ) 173,228 Net income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (30,635 ) — (30,635 ) Comprehensive income attributable to RenaissanceRe $ 141,921 $ 2,097 $ 13,967 $ 8,974 $ 151,114 $ (175,480 ) $ 142,593 (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 for the six months ended June 20, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 275,511 $ 3,168 $ 37,827 $ 22,920 $ 357,673 $ (346,362 ) $ 350,737 Change in net unrealized gains on investments — — — — 229 — 229 Comprehensive income 275,511 3,168 37,827 22,920 357,902 (346,362 ) 350,966 Net income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (75,226 ) — (75,226 ) Comprehensive income available to RenaissanceRe $ 275,511 $ 3,168 $ 37,827 $ 22,920 $ 282,676 $ (346,362 ) $ 275,740 (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 for the three months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 176,738 $ 2,507 $ 17,995 $ 10,391 $ 226,895 $ (220,176 ) $ 214,350 Change in net unrealized gains on investments — — — — 219 — 219 Comprehensive income 176,738 2,507 17,995 10,391 227,114 (220,176 ) 214,569 Net income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (37,612 ) — (37,612 ) Comprehensive income available to RenaissanceRe $ 176,738 $ 2,507 $ 17,995 $ 10,391 $ 189,502 $ (220,176 ) $ 176,957 (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 for the six months ended June 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (11,924 ) $ (8,931 ) $ (5,017 ) $ (27,713 ) $ 394,608 $ 341,023 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 53,654 46,475 289,741 15,449 4,758,653 5,163,972 Purchases of fixed maturity investments trading (105,523 ) (45,174 ) (143,991 ) (265,787 ) (4,890,887 ) (5,451,362 ) Net (purchases) sales of equity investments trading — (89 ) 85,324 — (38,930 ) 46,305 Net sales (purchases) of short term investments 298,768 (1,351 ) 41,299 (28,934 ) (33,707 ) 276,075 Net sales of other investments — — — — 2,551 2,551 Dividends and return of capital from subsidiaries 167,111 9,175 — 17,975 (194,261 ) — Contributions to subsidiaries (200,000 ) — — (9,175 ) 209,175 — Due (from) to subsidiary (12,477 ) 9 (41 ) 1,278 11,231 — Net cash provided by (used in) investing activities 201,533 9,045 272,332 (269,194 ) (176,175 ) 37,541 Cash flows (used in) provided by financing activities Dividends paid – RenaissanceRe common shares (25,877 ) — — — — (25,877 ) Dividends paid – preference shares (11,191 ) — — — — (11,191 ) RenaissanceRe common share repurchases (145,940 ) — — — — (145,940 ) Issuance of debt, net of expenses — — — 295,866 — 295,866 Repayment of debt — — (250,000 ) — — (250,000 ) Net third party redeemable noncontrolling interest share transactions — — — — (33,655 ) (33,655 ) Taxes paid on withholding shares (11,251 ) — — — — (11,251 ) Net cash (used in) provided by financing activities (194,259 ) — (250,000 ) 295,866 (33,655 ) (182,048 ) Effect of exchange rate changes on foreign currency cash — — — — 5,477 5,477 Net (decrease) increase in cash and cash equivalents (4,650 ) 114 17,315 (1,041 ) 190,255 201,993 Cash and cash equivalents, beginning of period 7,067 162 6,671 9,397 397,860 421,157 Cash and cash equivalents, end of period $ 2,417 $ 276 $ 23,986 $ 8,356 $ 588,115 $ 623,150 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) RenaissanceRe Consolidated Cash flows provided by (used in)operating activities Net cash provided by (used in) operating activities $ (11,131 ) $ 297 $ (3,914 ) $ (24,197 ) $ 164,186 $ 125,241 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 210,933 50,890 67,839 — 4,450,744 4,780,406 Purchases of fixed maturity investments trading (324,462 ) (105,772 ) (203,883 ) — (4,350,703 ) (4,984,820 ) Proceeds from sales and maturities of fixed maturity investments available for sale — — — — 5,216 5,216 Net (purchases) sales of equity investments trading — (2,195 ) 193,207 — (9,378 ) 181,634 Net sales (purchases) of short term investments 195,915 62,403 (58,367 ) — 45,948 245,899 Net purchases of other investments — — — — (52,778 ) (52,778 ) Dividends and return of capital from subsidiaries 341,011 2,900 — — (343,911 ) — Contributions to subsidiaries (95,001 ) — — — 95,001 — Due to (from) subsidiaries (22,676 ) (14,396 ) (92 ) 24,134 13,030 — Net cash provided by (used in) investing activities 305,720 (6,170 ) (1,296 ) 24,134 (146,831 ) 175,557 Cash flows used in financing activities Dividends paid – RenaissanceRe common shares (26,198 ) — — — — (26,198 ) Dividends paid – preference shares (11,191 ) — — — — (11,191 ) RenaissanceRe common share repurchases (265,003 ) — — — — (265,003 ) Net third party redeemable noncontrolling interest share transactions — — — — (43,909 ) (43,909 ) Taxes paid on withholding shares — — — — (8,069 ) (8,069 ) Net cash used in financing activities (302,392 ) — — — (51,978 ) (354,370 ) Effect of exchange rate changes on foreign currency cash — — — — 2,208 2,208 Net decrease in cash and cash equivalents (7,803 ) (5,873 ) (5,210 ) (63 ) (32,415 ) (51,364 ) Cash and cash equivalents, beginning of period 10,185 5,908 7,103 677 483,012 506,885 Cash and cash equivalents, end of period $ 2,382 $ 35 $ 1,893 $ 614 $ 450,597 $ 455,521 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Organization (Details)

Organization (Details)	Nov. 13, 2014
RenaissanceRe Upsilon Fund Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Percent of segregated funds owned by third party investors	100.00%

Significant Accounting Polici36

Significant Accounting Policies Significant Accounting Policies (Details) - Retained Earnings - USD ($) $ in Thousands	Jan. 01, 2017	Jan. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 2,213	$ 0
Cumulative effect of adoption of ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 2,200

Investments (Schedule of Fair V

Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Total fixed maturity investments trading	$ 7,282,264	$ 6,891,244
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	2,826,681	2,617,894
Agencies
Investment [Line Items]
Total fixed maturity investments trading	83,343	90,972
Municipal
Investment [Line Items]
Total fixed maturity investments trading	518,912	519,069
Non-U.S. government (Sovereign debt)
Investment [Line Items]
Total fixed maturity investments trading	173,667	333,224
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	74,620	133,300
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,186,040	1,877,243
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	567,560	462,493
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	275,268	258,944
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	384,610	409,747
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 191,563	$ 188,358

Investments (Schedule of Contra

Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Trading Securities [Abstract]
Amortized Cost, Due in less than one year	$ 428,307
Amortized Cost, Due after one through five years	4,112,662
Amortized Cost, Due after five through ten years	1,137,632
Amortized Cost, Due after ten years	168,920
Amortized Cost	7,257,020
Fair Value, Due in less than one year	427,683
Fair Value, Due after one through five years	4,111,191
Fair Value, Due after five through ten years	1,153,811
Fair Value, Due after ten years	170,578
Fair Value	7,282,264
Mortgage-backed
Trading Securities [Abstract]
Amortized Cost	1,218,486
Fair Value	1,227,438
Asset-backed
Trading Securities [Abstract]
Amortized Cost	191,013
Fair Value	$ 191,563

Investments (Schedule of Fair39

Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 393,405	$ 383,313
Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	272,982	275,065
Communications and technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	42,316	36,770
Industrial, utilities and energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	31,852	30,303
Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	22,078	20,501
Healthcare
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	20,087	17,245
Basic materials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 4,090	$ 3,429

Investments (Pledged Investment

Investments (Pledged Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties	$ 2,800	$ 2,700
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities	$ 888.2	$ 842.6

Investments (Reverse Purchase A

Investments (Reverse Purchase Agreements) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 33.8	$ 78.7
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 ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 58,031	$ 57,783	$ 116,048	$ 90,532
Investment expenses	(3,868)	(3,659)	(7,560)	(7,545)
Net investment income	54,163	54,124	108,488	82,987
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	44,356	46,091	87,775	82,097
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	2,981	1,227	4,705	2,227
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	889	865	1,700	2,528
Private equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	6,611	4,356	14,413	(5,002)
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	2,899	5,035	6,971	8,344
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 295	$ 209	$ 484	$ 338

Investments (Schedule of Net Re

Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains on investments	$ 58,113	$ 69,772	$ 101,486	$ 131,425
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains	15,249	22,661	26,710	40,411
Gross realized losses	(7,243)	(7,804)	(23,776)	(22,469)
Net realized gains	8,006	14,857	2,934	17,942
Net realized gains (losses) on investments trading	18,760	44,271	43,395	129,736
Derivatives
Gain (Loss) on Investments [Line Items]
Net realized and unrealized losses on investments-related derivatives	(268)	(9,151)	(324)	(28,600)
Equity investments
Gain (Loss) on Investments [Line Items]
Net realized gains	15,146	14,729	36,061	13,911
Net realized gains (losses) on investments trading	$ 16,469	$ 5,066	$ 19,420	$ (1,564)

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments trading	$ 393,405	$ 383,313
Other investments	561,212	549,805
Other assets and (liabilities)	(15,258)	(17,383)
Other assets	5,756	4,379
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	7,282,264	6,891,244
Short term investments	1,070,950	1,368,379
Equity investments trading		383,313
Other investments	561,212	549,805
Other assets and (liabilities)	(8,466)	(35,031)
Total assets and liabilities measured on recurring basis	9,299,365	9,157,710
Fair Value, Measurements, Recurring | 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	2,826,681	2,617,894
Short term investments	0	0
Equity investments trading	393,405	383,313
Other investments	0	0
Other assets and (liabilities)	210	(646)
Total assets and liabilities measured on recurring basis	3,220,296	3,000,561
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	4,455,583	4,273,350
Short term investments	1,070,950	1,368,379
Equity investments trading	0	0
Other investments	348,353	335,209
Other assets and (liabilities)	826	(21,381)
Total assets and liabilities measured on recurring basis	5,875,712	5,955,557
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Short term investments	0	0
Equity investments trading	0	0
Other investments	0	0
Other assets and (liabilities)	(9,502)	(13,004)
Total assets and liabilities measured on recurring basis	(9,502)	(13,004)
Fair Value, Measurements, Recurring | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,826,681	2,617,894
Fair Value, Measurements, Recurring | U.S. treasuries | 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	2,826,681	2,617,894
Fair Value, Measurements, Recurring | U.S. treasuries | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | U.S. treasuries | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	83,343	90,972
Fair Value, Measurements, Recurring | Agencies | 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	0	0
Fair Value, Measurements, Recurring | Agencies | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	83,343	90,972
Fair Value, Measurements, Recurring | Agencies | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	518,912	519,069
Fair Value, Measurements, Recurring | Municipal | 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	0	0
Fair Value, Measurements, Recurring | Municipal | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	518,912	519,069
Fair Value, Measurements, Recurring | Municipal | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	173,667	333,224
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | 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	0	0
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	173,667	333,224
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	74,620	133,300
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | 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	0	0
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	74,620	133,300
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,186,040	1,877,243
Fair Value, Measurements, Recurring | Corporate | 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	0	0
Fair Value, Measurements, Recurring | Corporate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,186,040	1,877,243
Fair Value, Measurements, Recurring | Corporate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	567,560	462,493
Fair Value, Measurements, Recurring | Agency mortgage-backed | 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	0	0
Fair Value, Measurements, Recurring | Agency mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	567,560	462,493
Fair Value, Measurements, Recurring | Agency mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	275,268	258,944
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | 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	0	0
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	275,268	258,944
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	384,610	409,747
Fair Value, Measurements, Recurring | Commercial mortgage-backed | 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	0	0
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	384,610	409,747
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	191,563	188,358
Fair Value, Measurements, Recurring | Asset-backed | 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	0	0
Fair Value, Measurements, Recurring | Asset-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	191,563	188,358
Fair Value, Measurements, Recurring | Asset-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Catastrophe bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	348,353	335,209
Fair Value, Measurements, Recurring | Catastrophe bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	348,353	335,209
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	194,331	191,061
Fair Value, Measurements, Recurring | Private equity partnerships | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	17,321	22,040
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	1,207	1,495
Fair Value, Measurements, Recurring | Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(9,502)	(13,004)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(9,502)	(13,004)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	5,800	4,400
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(15,300)	(17,400)
Fair Value, Measurements, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	6,391	(8,922)
Fair Value, Measurements, Recurring | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	210	(646)
Fair Value, Measurements, Recurring | Derivatives | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	6,181	(8,276)
Fair Value, Measurements, Recurring | Derivatives | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(5,355)	(13,105)
Fair Value, Measurements, Recurring | Other | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Other | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(5,355)	(13,105)
Fair Value, Measurements, Recurring | Other | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	$ 0	$ 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 ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Premiums written
Direct	$ 67,805	$ 57,541	$ 141,213	$ 100,717
Assumed	759,610	701,587	1,608,292	1,520,544
Ceded	(271,670)	(239,212)	(649,624)	(589,670)
Net premiums written	555,745	519,916	1,099,881	1,031,591
Premiums earned
Direct	56,357	37,936	114,525	71,076
Assumed	520,347	464,540	1,019,346	921,181
Ceded	(194,439)	(151,074)	(385,561)	(287,249)
Net premiums earned	382,265	351,402	748,310	705,008
Claims and claim expenses
Gross claims and claim expenses incurred	189,903	224,852	441,707	386,850
Claims and claim expenses recovered	(47,316)	(57,102)	(106,039)	(92,495)
Net claims and claim expenses incurred	$ 142,587	$ 167,750	$ 335,668	$ 294,355

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	$ 15,258		$ 15,258		$ 17,383
Debt	988,866		988,866		948,663
Debt, fair value	1,021,300		1,021,300		964,800
Net unrealized gains (losses) recognized in earnings			12,491	$ (20,360)
Net investment income | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	5,600	$ (5,800)	12,500	$ (3,200)
Other income (loss) | Other assets and (liabilities)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	0	$ 0	0		$ 0
Significant Unobservable Inputs (Level 3) | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	9,502		9,502
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	809		809
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contract | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 10,311		$ 10,311
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.50%		1.50%		1.40%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.00%		2.00%		2.00%
Municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.90%		1.90%		2.40%
Non-U.S. government (Sovereign debt)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.70%		1.60%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.80%		1.80%		1.50%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.60%		3.60%		3.70%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%		2.90%
Weighted average life			6 years 7 months 6 days		6 years 10 months 24 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.00%		4.00%		4.30%
Weighted average life			5 years 1 month 6 days		5 years 1 month 6 days
AltA non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.40%		4.40%		5.20%
Weighted average life			6 years 1 month 6 days		6 years
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.80%		2.80%		2.60%
Weighted average life			4 years 9 months 18 days		3 years 10 months 24 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.50%		2.50%		2.30%
Weighted average life			2 years 8 months 12 days		2 years 7 months 6 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.10%		1.10%		0.70%
Restricted stock units | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	$ 5,400		$ 5,400
Private equity partnerships | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			7 years
Private equity partnerships | High
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in closed end fund	17,300		$ 17,300
Senior secured bank loan funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			4 years
Senior secured bank loan funds | High
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Hedge fund side pocket investments	$ 1,200		$ 1,200

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - Internal Valuation Model - Significant Unobservable Inputs (Level 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets and (liabilities)		$ (9,502)
Assumed reinsurance contract
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value		$ 809
Assumed reinsurance contract | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share)	$ 101.59
Assumed reinsurance contract | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share)	111.15
Assumed reinsurance contract | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share)	$ 106.94
Liquidity discount		1.30%
Assumed and ceded (re)insurance contract
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets and (liabilities)		$ (10,311)
Assumed and ceded (re)insurance contract | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period		2 years
Assumed and ceded (re)insurance contract | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period		4 years 7 months 27 days
Assumed and ceded (re)insurance contract | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net undiscounted cash flows		$ (12,715)
Expected loss ratio		30.60%
Net acquisition expense ratio		(17.40%)
Contract period		4 years 6 months
Discount rate		1.90%

Fair Value Measurements (Asse48

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period		$ 2,776	$ 1,719		$ 1,719
Total realized and unrealized gains
Purchases		(48)			(573)
Settlements		(7,500)			(7,500)
Balance at end of the period		(2,680)	2,776		(2,680)
Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)			(118)
Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)		2,092	3,792
Other assets and (liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ (12,135)	(4,724)	(5,899)	$ (13,004)	(5,899)
Total realized and unrealized gains
Purchases	314	(48)		112	(573)
Settlements		0			0
Balance at end of the period	(9,502)	(2,680)	(4,724)	(9,502)	(2,680)
Other assets and (liabilities) | Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)			0
Other assets and (liabilities) | Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)	$ 2,319	2,092	3,792	$ 3,390
Fixed maturity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period		7,500	7,618		7,618
Total realized and unrealized gains
Purchases		0			0
Settlements		(7,500)			(7,500)
Balance at end of the period		0	7,500		$ 0
Fixed maturity investments | Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)			(118)
Fixed maturity investments | Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)		$ 0	$ 0

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of The Balances Company Has Elected To Account For At Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Other investments	$ 561,212	$ 549,805
Other assets	5,756	4,379
Other liabilities	$ 15,258	$ 17,383

Fair Value Measurements (Compan

Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 212,859
Unfunded Commitments	336,469
Private equity partnerships
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	194,331
Unfunded Commitments	310,367
Senior secured bank loan funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	17,321
Unfunded Commitments	26,102
Hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	1,207
Unfunded Commitments	$ 0

Reserve for Claims and Claim 51

Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 860,264	$ 813,594
Additional Case Reserves	278,531	291,727
IBNR	1,851,011	1,742,973
Net reserve for claims and claim expenses	2,989,806	2,848,294	$ 2,844,243
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	2,532	6,935
Additional Case Reserves	0	0
IBNR	14,933	18,459
Net reserve for claims and claim expenses	17,465	25,394
Property
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	221,898	214,954
Additional Case Reserves	167,510	186,308
IBNR	216,163	226,512
Net reserve for claims and claim expenses	605,571	627,774
Casualty and Specialty
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	635,834	591,705
Additional Case Reserves	111,021	105,419
IBNR	1,619,915	1,498,002
Net reserve for claims and claim expenses	$ 2,366,770	$ 2,195,126

Reserve for Claims and Claim 52

Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves as of January 1			$ 2,568,730	$ 2,632,519
Net incurred related to:
Current year	$ 187,691	$ 197,005	351,766	325,214
Prior years	(45,104)	(29,255)	(16,098)	(30,859)
Total net incurred	142,587	167,750	335,668	294,355
Net paid related to:
Current year			19,885	11,070
Prior years			285,046	297,716
Total net paid			304,931	308,786
Foreign exchange			19,753	4,149
Net reserves as of June 30	2,619,220	2,622,237	2,619,220	2,622,237
Reinsurance recoverable as of June 30	370,586	222,006	370,586	222,006
Gross reserves as of June 30	$ 2,989,806	$ 2,844,243	$ 2,989,806	$ 2,844,243

Reserve for Claims and Claim 53

Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (45,104)	$ (29,255)	$ (16,098)	$ (30,859)
Ogden Rate
Liability for Catastrophe Claims [Line Items]
Discount rate			(0.75%)		2.50%
Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (227)	$ 85	$ (555)	3
Property
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(24,800)	(18,989)
Property | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(843)	0
Property | Large and Small Catastrophe Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(25,643)	(18,989)
Property | Large catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			1,851	1,054
Property | New Zealand Earthquake (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			5,807	0
Property | New Zealand Earthquake (2010)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			4,061	2,962
Property | April and May U.S. Tornadoes (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,153)	(1,408)
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(3,864)	(500)
Property | Small catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(27,494)	(20,043)
Property | Fort McMurray Wildfire (2016)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(5,848)	0
Property | Tianjin Explosion (2015)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,896)	0
Property | U.S. PCS 13/14 Wind and Thunderstorm (2013)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(3,906)	(6,260)
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(12,844)	(13,783)
Casualty and Specialty
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			9,257	(11,873)
Casualty and Specialty | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(2,462)	(6,118)
Casualty and Specialty | Actuarial methods - actual reported claims lower than expected claims
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(21,762)	(5,755)
Casualty and Specialty | Ogden Rate change
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			$ 33,481	$ 0

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 29, 2017	Jun. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, fair value	$ 1,021,300			$ 964,800
Debt	$ 988,866			$ 948,663
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	3.70%
5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate	5.75%
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Debt instrument, interest rate				7.50%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Debt instrument, interest rate	4.75%
Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 1,021,341			$ 964,800
Debt	988,866			948,663
Senior Notes | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, fair value	300,327			291,750
Debt	297,132			296,948
Senior Notes | 5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, fair value	268,228			270,875
Debt	249,106			248,941
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term debt, fair value	296,400			0
Debt	295,053			0
Debt instrument, interest rate		3.45%
Senior Notes | Platinum Underwriters Finance, Inc | Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Long-term debt, fair value	0			257,500
Debt	0			255,352
Debt instrument, interest rate			7.50%
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Long-term debt, fair value	156,386			144,675
Debt	$ 147,575			$ 147,422

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details) £ in Millions	May 24, 2017USD ($)letter_of_credit	Jun. 30, 2017	Jun. 29, 2017USD ($)	Jun. 01, 2017USD ($)	May 25, 2017USD ($)	May 25, 2017GBP (£)	Dec. 31, 2016
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Senior notes interest rate		3.45%
3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate			3.45%
Debt instrument, face amount			$ 300,000,000
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Senior notes interest rate							7.50%
Series B 7.50% Senior Notes due 2017 | Platinum Underwriters Finance, Inc | Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate				7.50%
Debt instrument, face amount				$ 250,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit
Debt Instrument [Line Items]
Number of letters of credit | letter_of_credit	2
Maximum increases in or issuances of borrowing capacity					$ 75,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit | Line of Credit
Debt Instrument [Line Items]
Letter of credit aggregate commitment	$ 380,000,000				$ 180,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit | Line Of Credit Two
Debt Instrument [Line Items]
Letter of credit aggregate commitment | £						£ 90

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Jun. 30, 2017 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 496,800	£ 10,000
Wells Fargo | Standby Letter of Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	105,892
National Australia Bank Limited | Standby Letter of Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	4,525
Citibank Europe PLC | Bilateral Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	206,383
Bank Of Montreal, Citibank Europe and ING Bank | Renaissance Reinsurance FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	180,000
Bank Of Montreal, Citibank Europe and ING Bank | Specialty Risks FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding | £		£ 10,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 0

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Mar. 31, 2017	Jan. 01, 2017	Mar. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests			$ 1,242,083		$ 1,242,083		$ 1,175,594
Net income attributable to redeemable noncontrolling interests			37,612	$ 30,635	71,939	$ 75,226
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests			1,019,918	953,443	1,019,918	953,443	$ 994,458	$ 986,646		$ 926,141		$ 930,955
Net income attributable to redeemable noncontrolling interests			$ 36,432	28,288	$ 68,341	71,252
Parent company ownership in redeemable noncontrolling interest			22.60%		22.60%		24.00%		22.60%		24.00%
Redeemable noncontrolling interest, net redemptions	$ 75,000	$ 100,000
Redeemable noncontrolling interest, reserve holdback	7,500	$ 10,000
Noncontrolling interest, Change from purchase or sale of interests	$ 24,000
Sale of shares to redeemable noncontrolling interest			$ 0	0	$ 23,921	43,040
Redemption of shares from redeemable noncontrolling interest			$ 3,160	986	$ 66,802	91,804
DaVinciRe Holdings Ltd. | High
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, limit			25.00%		25.00%
RenaissanceRe Medici Fund Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests			$ 222,165	168,960	$ 222,165	168,960	$ 181,136	$ 201,345		$ 155,196		$ 115,009
Net income attributable to redeemable noncontrolling interests			$ 1,180	2,347	$ 3,598	3,974
Parent company ownership in redeemable noncontrolling interest			32.30%		32.30%		36.50%
Redemption provision, notice period					30 days
Sale of shares to redeemable noncontrolling interest			$ 34,925	17,817	$ 63,341	57,317	$ 79,500
Redemption of shares from redeemable noncontrolling interest			$ 15,285	$ 6,400	$ 25,910	$ 7,340	$ 21,700

Noncontrolling Interests (Sched

Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Activity in redeemable noncontrolling interest
Beginning balance			$ 1,175,594
Net income attributable to redeemable noncontrolling interest	$ 37,612	$ 30,635	71,939	$ 75,226
Ending balance	1,242,083		1,242,083		$ 1,175,594
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	986,646	926,141	994,458	930,955	930,955
Redemption of shares from redeemable noncontrolling interest	(3,160)	(986)	(66,802)	(91,804)
Sale of shares to redeemable noncontrolling interests	0	0	23,921	43,040
Net income attributable to redeemable noncontrolling interest	36,432	28,288	68,341	71,252
Ending balance	1,019,918	953,443	1,019,918	953,443	994,458
RenaissanceRe Medici Fund Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	201,345	155,196	181,136	115,009	115,009
Redemption of shares from redeemable noncontrolling interest	(15,285)	(6,400)	(25,910)	(7,340)	(21,700)
Sale of shares to redeemable noncontrolling interests	34,925	17,817	63,341	57,317	79,500
Net income attributable to redeemable noncontrolling interest	1,180	2,347	3,598	3,974
Ending balance	$ 222,165	$ 168,960	$ 222,165	$ 168,960	$ 181,136

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 01, 2017	Jan. 01, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Assets			$ 13,705,680		$ 13,705,680		$ 12,352,082
Liabilities			7,508,342		7,508,342		6,309,911
Ceded premiums written			271,670	$ 239,212	649,624	$ 589,670
Ceded premiums earned			194,439	$ 151,074	385,561	287,249
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.
Variable Interest Entity [Line Items]
Return of capital					41,800		242,500
Assets			339,100		339,100		193,000
Liabilities			339,100		339,100		193,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Issuance of equity to third party investors					134,100		166,600
Contributions to subsidiaries					9,500		55,200
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Return of capital					$ 9,500		$ 59,800
Variable interest entity, ownership percentage					16.60%		28.80%
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries					$ 7,500
Variable Interest Entity, Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					9,400
Ceded premiums earned					3,800
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Issuance of equity to third party investors	$ 45,000	$ 140,000
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other Investments
Variable Interest Entity [Line Items]
Investment in participating notes			55,500		55,500
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd
Variable Interest Entity [Line Items]
Assets			181,200		181,200		$ 184,200
Liabilities			$ 181,200		181,200		$ 184,200
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					100	100
Ceded premiums earned					3,600	3,600
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | DaVinci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					37	100
Ceded premiums earned					$ 2,500	$ 2,500

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions	Jun. 30, 2017	Jun. 15, 2017	Mar. 31, 2017	Mar. 15, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Aug. 02, 2016
Class of Stock [Line Items]
Dividends per common share (in dollars per share)					$ 0.32	$ 0.31	$ 0.64	$ 0.62
Dividends declared and paid, Preference shares					$ 5,596,000	$ 5,596,000	$ 11,191,000	$ 11,191,000
Retained Earnings
Class of Stock [Line Items]
Dividends declared and paid, Preference shares							11,191,000	11,191,000
Dividends declared and paid, Common shares							$ 25,877,000	$ 26,198,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.32		$ 0.32
Dividends paid per common share (in dollars per share)	$ 0.32		$ 0.32
Share repurchase program, Authorized amount									$ 500,000,000
Common shares repurchased during period, Number of shares							1.1
Common shares repurchased during period, Aggregate amount							$ 149,700,000
Common shares repurchased during period, Average cost (in dollars per share)							$ 142.33
Share repurchase program, Remaining authorized aggregate amount	$ 485,100,000				$ 485,100,000		$ 485,100,000

Earnings Per Share (Computation

Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income available to RenaissanceRe common shareholders	$ 171,142	$ 136,325	$ 263,494	$ 264,320
Amount allocated to participating common shareholders	(1,585)	(1,561)	(2,526)	(3,166)
Net income allocated to RenaissanceRe common shareholders	$ 169,557	$ 134,764	$ 260,968	$ 261,154
Denominator:
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares)	39,937	41,693	40,172	42,135
Per common share equivalents of employee stock options and restricted shares (in shares)	87	192	152	263
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	40,024	41,885	40,324	42,398
Net income available to RenaissanceRe common shareholders per common share – basic	$ 4.25	$ 3.23	$ 6.50	$ 6.20
Net income available to RenaissanceRe common shareholders per common share – diluted	$ 4.24	$ 3.22	$ 6.47	$ 6.16

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Gross premiums written	$ 827,415	$ 759,128	$ 1,749,505	$ 1,621,261
Net premiums written	555,745	519,916	1,099,881	1,031,591
Net premiums earned	382,265	351,402	748,310	705,008
Net claims and claim expenses incurred	142,587	167,750	335,668	294,355
Acquisition expenses	88,251	69,005	171,533	134,597
Operational expenses	41,766	51,073	89,049	107,308
Underwriting income (loss)	109,661	63,574	152,060	168,748
Net investment income	54,163	54,124	108,488	82,987
Net foreign exchange gains (losses)	3,109	(690)	11,274	(2,382)
Equity in earnings of other ventures	(5,543)	(6,022)	(4,036)	(7,633)
Other income	2,392	2,654	4,057	6,733
Net realized and unrealized gains on investments	58,113	69,772	101,486	131,425
Corporate expenses	(4,636)	(5,752)	(9,922)	(13,977)
Interest expense	(10,091)	(10,536)	(20,617)	(21,074)
Income before taxes	218,254	179,168	350,862	360,093
Income tax expense	(3,904)	(6,612)	(4,238)	(9,356)
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Dividends on preference shares	(5,596)	(5,596)	(11,191)	(11,191)
Net income available to RenaissanceRe common shareholders	171,142	136,325	263,494	264,320
Net claims and claim expenses incurred – current accident year	187,691	197,005	351,766	325,214
Net claims and claim expenses incurred – prior accident years	(45,104)	(29,255)	(16,098)	(30,859)
Total net incurred	$ 142,587	$ 167,750	$ 335,668	$ 294,355
Net claims and claim expense ratio – current accident year	49.10%	56.10%	47.00%	46.10%
Net claims and claim expense ratio – prior accident years	(11.80%)	(8.40%)	(2.10%)	(4.30%)
Net claims and claim expense ratio – calendar year	37.30%	47.70%	44.90%	41.80%
Underwriting expense ratio	34.00%	34.20%	34.80%	34.30%
Combined ratio	71.30%	81.90%	79.70%	76.10%
Other
Segment Reporting Information [Line Items]
Gross premiums written	$ 0	$ 0	$ 0	$ 0
Net premiums written	0	0	0	0
Net premiums earned	2	0	0	0
Net claims and claim expenses incurred	(227)	85	(555)	3
Acquisition expenses	(1)	0	(1)	0
Operational expenses	1	21	12	81
Underwriting income (loss)	229	(106)	544	(84)
Net investment income	54,163	54,124	108,488	82,987
Net foreign exchange gains (losses)	3,109	(690)	11,274	(2,382)
Equity in earnings of other ventures	(5,543)	(6,022)	(4,036)	(7,633)
Other income	2,392	2,654	4,057	6,733
Net realized and unrealized gains on investments	58,113	69,772	101,486	131,425
Corporate expenses	(4,636)	(5,752)	(9,922)	(13,977)
Interest expense	(10,091)	(10,536)	(20,617)	(21,074)
Income tax expense	(3,904)	(6,612)	(4,238)	(9,356)
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Dividends on preference shares	(5,596)	(5,596)	(11,191)	(11,191)
Net claims and claim expenses incurred – current accident year	0	0	0	0
Net claims and claim expenses incurred – prior accident years	(227)	85	(555)	3
Total net incurred	(227)	85	(555)	3
Property
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			(24,800)	(18,989)
Property | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	499,347	493,953	1,019,876	938,912
Net premiums written	336,464	350,593	626,335	583,452
Net premiums earned	192,198	191,060	379,186	366,292
Net claims and claim expenses incurred	33,017	80,275	71,855	102,079
Acquisition expenses	28,500	29,389	57,603	49,513
Operational expenses	24,053	26,526	51,718	55,183
Underwriting income (loss)	106,628	54,870	198,010	159,517
Net claims and claim expenses incurred – current accident year	56,889	93,336	96,655	121,068
Net claims and claim expenses incurred – prior accident years	(23,872)	(13,061)	(24,800)	(18,989)
Total net incurred	$ 33,017	$ 80,275	$ 71,855	$ 102,079
Net claims and claim expense ratio – current accident year	29.60%	48.90%	25.50%	33.10%
Net claims and claim expense ratio – prior accident years	(12.40%)	(6.90%)	(6.60%)	(5.20%)
Net claims and claim expense ratio – calendar year	17.20%	42.00%	18.90%	27.90%
Underwriting expense ratio	27.30%	29.30%	28.90%	28.60%
Combined ratio	44.50%	71.30%	47.80%	56.50%
Casualty and Specialty
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			$ 9,257	$ (11,873)
Casualty and Specialty | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	$ 328,068	$ 265,175	729,629	682,349
Net premiums written	219,281	169,323	473,546	448,139
Net premiums earned	190,065	160,342	369,124	338,716
Net claims and claim expenses incurred	109,797	87,390	264,368	192,273
Acquisition expenses	59,752	39,616	113,931	85,084
Operational expenses	17,712	24,526	37,319	52,044
Underwriting income (loss)	2,804	8,810	(46,494)	9,315
Net claims and claim expenses incurred – current accident year	130,802	103,669	255,111	204,146
Net claims and claim expenses incurred – prior accident years	(21,005)	(16,279)	9,257	(11,873)
Total net incurred	$ 109,797	$ 87,390	$ 264,368	$ 192,273
Net claims and claim expense ratio – current accident year	68.80%	64.70%	69.10%	60.30%
Net claims and claim expense ratio – prior accident years	(11.00%)	(10.20%)	2.50%	(3.50%)
Net claims and claim expense ratio – calendar year	57.80%	54.50%	71.60%	56.80%
Underwriting expense ratio	40.70%	40.00%	41.00%	40.40%
Combined ratio	98.50%	94.50%	112.60%	97.20%

Derivative Instruments (Consoli

Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Assets
Derivative Assets
Gross Amounts of Recognized Assets	$ 11,081	$ 4,208
Gross Amounts Offset in the Balance Sheet	1,627	1,705
Net Amounts of Assets Presented in the Balance Sheet	9,454	2,503
Collateral	0	0
Net Amount	9,454	2,503
Other Assets | Interest Rate Futures
Derivative Assets
Gross Amounts of Recognized Assets	1,277	1,384
Gross Amounts Offset in the Balance Sheet	973	1,235
Net Amounts of Assets Presented in the Balance Sheet	304	149
Collateral	0	0
Net Amount	304	149
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
Derivative Assets
Gross Amounts of Recognized Assets	7,245	774
Gross Amounts Offset in the Balance Sheet	617	0
Net Amounts of Assets Presented in the Balance Sheet	6,628	774
Collateral	0	0
Net Amount	6,628	774
Other Assets | Foreign Currency Forward Contracts, Investment Operations
Derivative Assets
Gross Amounts of Recognized Assets	57	621
Gross Amounts Offset in the Balance Sheet	18	447
Net Amounts of Assets Presented in the Balance Sheet	39	174
Collateral	0	0
Net Amount	39	174
Other Assets | Credit Default Swaps
Derivative Assets
Gross Amounts of Recognized Assets	2,502	1,429
Gross Amounts Offset in the Balance Sheet	19	23
Net Amounts of Assets Presented in the Balance Sheet	2,483	1,406
Collateral	0	0
Net Amount	2,483	1,406
Other Liabilities
Derivative Liabilities
Gross Amounts of Recognized Liabilities	4,073	13,527
Gross Amounts Offset in the Balance Sheet	1,010	2,102
Net Amounts of Liabilities Presented in the Balance Sheet	3,063	11,425
Collateral Pledged	94	789
Net Amount	2,969	10,636
Other Liabilities | Interest Rate Futures
Derivative Liabilities
Gross Amounts of Recognized Liabilities	1,067	2,030
Gross Amounts Offset in the Balance Sheet	973	1,235
Net Amounts of Liabilities Presented in the Balance Sheet	94	795
Collateral Pledged	94	789
Net Amount	0	6
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	2,273	10,550
Gross Amounts Offset in the Balance Sheet	0	397
Net Amounts of Liabilities Presented in the Balance Sheet	2,273	10,153
Collateral Pledged	0	0
Net Amount	2,273	10,153
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	97	766
Gross Amounts Offset in the Balance Sheet	18	447
Net Amounts of Liabilities Presented in the Balance Sheet	79	319
Collateral Pledged	0	0
Net Amount	79	319
Other Liabilities | Credit Default Swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	636	181
Gross Amounts Offset in the Balance Sheet	19	23
Net Amounts of Liabilities Presented in the Balance Sheet	617	158
Collateral Pledged	0	0
Net Amount	$ 617	$ 158

Derivative Instruments (Gain (L

Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ 4,688	$ (10,325)	$ 5,059	$ (37,006)
Net realized and unrealized gains on investments | Interest Rate Futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(890)	(9,456)	(1,048)	(28,815)
Net realized and unrealized gains on investments | Credit Default Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	622	305	724	215
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	5,223	(3,815)	6,283	(5,189)
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Investment Operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ (267)	$ 2,641	$ (900)	$ (3,217)

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Interest Rate Futures | Long
Derivative [Line Items]
Notional amount	$ 1,100,000,000	$ 1,200,000,000
Interest Rate Futures | Short
Derivative [Line Items]
Notional amount	714,000,000	727,900,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long
Derivative [Line Items]
Notional amount	218,100,000	184,200,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short
Derivative [Line Items]
Notional amount	104,100,000	91,400,000
Foreign Currency Forward Contracts, Investment Operations | Long
Derivative [Line Items]
Notional amount	20,100,000	26,900,000
Foreign Currency Forward Contracts, Investment Operations | Short
Derivative [Line Items]
Notional amount	5,100,000	57,300,000
Credit Default Swaps | Long
Derivative [Line Items]
Notional amount	30,000,000	0
Credit Default Swaps | Short
Derivative [Line Items]
Notional amount	$ 36,400,000	$ 75,200,000

Condensed Consolidating Finan66

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Assets
Total investments	$ 9,408,908	$ 9,316,968
Cash and cash equivalents	623,150	421,157	$ 455,521	$ 506,885
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,533,833	987,323
Prepaid reinsurance premiums	705,322	441,260
Reinsurance recoverable	370,586	279,564	222,006
Accrued investment income	40,118	38,076
Deferred acquisition costs	430,106	335,325
Receivable for investments sold	170,411	105,841
Other assets	176,816	175,382
Goodwill and other intangible assets	246,430	251,186
Total assets	13,705,680	12,352,082
Liabilities
Reserve for claims and claim expenses	2,989,806	2,848,294	2,844,243
Unearned premiums	1,847,206	1,231,573
Debt	988,866	948,663
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	1,052,494	673,983
Payable for investments purchased	407,312	305,714
Other liabilities	222,658	301,684
Total liabilities	7,508,342	6,309,911
Redeemable noncontrolling interests	1,242,083	1,175,594
Shareholders' Equity
Total shareholders’ equity	4,955,255	4,866,577	4,703,217
Total liabilities, noncontrolling interests and shareholders’ equity	13,705,680	12,352,082
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Assets
Total investments	123,517	119,163
Cash and cash equivalents	276	162	35	5,908
Investments in subsidiaries	36,924	34,761
Due from subsidiaries and affiliates	91,892	91,892
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	288	289
Deferred acquisition costs	0	0
Receivable for investments sold	5	2
Other assets	37,547	37,204
Goodwill and other intangible assets	0	0
Total assets	290,449	283,473
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	51	42
Reinsurance balances payable	0	0
Payable for investments purchased	24	0
Other liabilities	780	10,544
Total liabilities	855	10,586
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	289,594	272,887
Total liabilities, noncontrolling interests and shareholders’ equity	290,449	283,473
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	0	267,556
Cash and cash equivalents	23,986	6,671	1,893	7,103
Investments in subsidiaries	871,117	843,089
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	551
Deferred acquisition costs	0	0
Receivable for investments sold	0	99
Other assets	(29)	4,689
Goodwill and other intangible assets	0	0
Total assets	895,074	1,122,655
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	255,352
Amounts due to subsidiaries and affiliates	82	123
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(2,757)	0
Total liabilities	(2,675)	255,475
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	897,749	867,180
Total liabilities, noncontrolling interests and shareholders’ equity	895,074	1,122,655
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	323,094	45,027
Cash and cash equivalents	8,356	9,397	614	677
Investments in subsidiaries	1,195,266	1,165,413
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	921	106
Deferred acquisition costs	0	0
Receivable for investments sold	0	45
Other assets	130,139	127,572
Goodwill and other intangible assets	0	0
Total assets	1,657,776	1,347,560
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	841,290	545,889
Amounts due to subsidiaries and affiliates	97,339	96,061
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	9,887	13,350
Total liabilities	948,516	655,300
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	709,260	692,260
Total liabilities, noncontrolling interests and shareholders’ equity	1,657,776	1,347,560
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	140,492	387,274
Cash and cash equivalents	2,417	7,067	2,382	10,185
Investments in subsidiaries	4,388,394	4,074,769
Due from subsidiaries and affiliates	5,489	7,413
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	291	105
Deferred acquisition costs	0	0
Receivable for investments sold	52	136
Other assets	423,601	410,757
Goodwill and other intangible assets	127,532	130,407
Total assets	5,088,268	5,017,928
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	117,000	117,000
Amounts due to subsidiaries and affiliates	243	14,644
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	15,770	19,707
Total liabilities	133,013	151,351
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	4,955,255	4,866,577
Total liabilities, noncontrolling interests and shareholders’ equity	5,088,268	5,017,928
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	8,821,805	8,497,948
Cash and cash equivalents	588,115	397,860	$ 450,597	$ 483,012
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,533,833	987,323
Prepaid reinsurance premiums	705,322	441,260
Reinsurance recoverable	370,586	279,564
Accrued investment income	38,618	37,025
Deferred acquisition costs	430,106	335,325
Receivable for investments sold	170,354	105,559
Other assets	115,352	118,098
Goodwill and other intangible assets	118,898	120,779
Total assets	12,892,989	11,320,741
Liabilities
Reserve for claims and claim expenses	2,989,806	2,848,294
Unearned premiums	1,847,206	1,231,573
Debt	147,576	147,422
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	1,052,494	673,983
Payable for investments purchased	407,288	305,714
Other liabilities	206,139	270,610
Total liabilities	6,650,509	5,477,596
Redeemable noncontrolling interests	1,242,083	1,175,594
Shareholders' Equity
Total shareholders’ equity	5,000,397	4,667,551
Total liabilities, noncontrolling interests and shareholders’ equity	12,892,989	11,320,741
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(6,491,701)	(6,118,032)
Due from subsidiaries and affiliates	(97,381)	(99,305)
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	(529,794)	(522,938)
Goodwill and other intangible assets	0	0
Total assets	(7,118,876)	(6,740,275)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	(117,000)	(117,000)
Amounts due to subsidiaries and affiliates	(97,715)	(110,870)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(7,161)	(12,527)
Total liabilities	(221,876)	(240,397)
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	(6,897,000)	(6,499,878)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (7,118,876)	$ (6,740,275)

Condensed Consolidating Finan67

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Net premiums earned	$ 382,265	$ 351,402	$ 748,310	$ 705,008
Net investment income	54,163	54,124	108,488	82,987
Net foreign exchange gains (losses)	3,109	(690)	11,274	(2,382)
Equity in earnings of other ventures	5,543	6,022	4,036	7,633
Other income (loss)	2,392	2,654	4,057	6,733
Net realized and unrealized gains (losses) on investments	58,113	69,772	101,486	131,425
Total revenues	505,585	483,284	977,651	931,404
Expenses
Net claims and claim expenses incurred	142,587	167,750	335,668	294,355
Acquisition expenses	88,251	69,005	171,533	134,597
Operational expenses	41,766	51,073	89,049	107,308
Corporate expenses	4,636	5,752	9,922	13,977
Interest expense	10,091	10,536	20,617	21,074
Total expenses	287,331	304,116	626,789	571,311
(Loss) income before equity in net income (loss) of subsidiaries and taxes	218,254	179,168	350,862	360,093
Equity in net income (loss) of subsidiaries	0	0	0	0
Income before taxes	218,254	179,168	350,862	360,093
Income tax expense	(3,904)	(6,612)	(4,238)	(9,356)
Net income	214,350	172,556	346,624	350,737
Net income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Net income attributable to RenaissanceRe	176,738	141,921	274,685	275,511
Dividends on preference shares	(5,596)	(5,596)	(11,191)	(11,191)
Net income available to RenaissanceRe common shareholders	171,142	136,325	263,494	264,320
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income	466	445	892	954
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	1,421	1,139	4,342	2,254
Total revenues	1,887	1,584	5,234	3,208
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	16	44	40	(97)
Corporate expenses	0	203	0	203
Interest expense	0	0	0	0
Total expenses	16	247	40	106
(Loss) income before equity in net income (loss) of subsidiaries and taxes	1,871	1,337	5,194	3,102
Equity in net income (loss) of subsidiaries	1,220	1,666	2,306	1,533
Income before taxes	3,091	3,003	7,500	4,635
Income tax expense	(584)	(906)	(1,682)	(1,467)
Net income	2,507	2,097	5,818	3,168
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	2,507	2,097	5,818	3,168
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	2,507	2,097	5,818	3,168
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income	535	846	1,376	2,279
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	191	3,414	4,916	5,378
Total revenues	726	4,260	6,292	7,657
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	35	64	85	116
Corporate expenses	0	0	0	0
Interest expense	985	1,477	2,461	2,953
Total expenses	1,020	1,541	2,546	3,069
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(294)	2,719	3,746	4,588
Equity in net income (loss) of subsidiaries	18,185	12,086	28,028	34,421
Income before taxes	17,891	14,805	31,774	39,009
Income tax expense	104	(838)	(1,204)	(1,182)
Net income	17,995	13,967	30,570	37,827
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	17,995	13,967	30,570	37,827
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	17,995	13,967	30,570	37,827
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income	239	141	508	281
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	302	0	(450)	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	(242)	0	(268)	0
Total revenues	299	141	(210)	281
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	6,647	4,573	14,626	11,582
Corporate expenses	0	7	0	7
Interest expense	6,601	6,544	13,143	13,087
Total expenses	13,248	11,124	27,769	24,676
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(12,949)	(10,983)	(27,979)	(24,395)
Equity in net income (loss) of subsidiaries	20,438	17,165	36,936	41,644
Income before taxes	7,489	6,182	8,957	17,249
Income tax expense	2,902	2,792	5,974	5,671
Net income	10,391	8,974	14,931	22,920
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	10,391	8,974	14,931	22,920
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	10,391	8,974	14,931	22,920
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Revenues
Net premiums earned	0	0	0	0
Net investment income	5,284	5,749	10,741	12,607
Net foreign exchange gains (losses)	(1)	(1)	(1)	(2)
Equity in earnings of other ventures	0	0	0	0
Other income (loss)	0	(791)	(1)	(791)
Net realized and unrealized gains (losses) on investments	(8)	799	45	5,287
Total revenues	5,275	5,756	10,784	17,101
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	3,190	(1,104)	6,488	(1,805)
Corporate expenses	4,798	5,181	10,006	10,794
Interest expense	141	141	281	281
Total expenses	8,129	4,218	16,775	9,270
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(2,854)	1,538	(5,991)	7,831
Equity in net income (loss) of subsidiaries	178,746	141,677	280,099	265,215
Income before taxes	175,892	143,215	274,108	273,046
Income tax expense	846	(1,294)	577	2,465
Net income	176,738	141,921	274,685	275,511
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	176,738	141,921	274,685	275,511
Dividends on preference shares	(5,596)	(5,596)	(11,191)	(11,191)
Net income available to RenaissanceRe common shareholders	171,142	136,325	263,494	264,320
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Revenues
Net premiums earned	382,265	351,402	748,310	705,008
Net investment income	53,891	52,826	107,474	78,632
Net foreign exchange gains (losses)	3,110	(689)	11,275	(2,380)
Equity in earnings of other ventures	5,241	6,022	4,486	7,633
Other income (loss)	2,392	3,445	4,058	7,524
Net realized and unrealized gains (losses) on investments	56,751	64,420	92,451	118,506
Total revenues	503,650	477,426	968,054	914,923
Expenses
Net claims and claim expenses incurred	142,587	167,750	335,668	294,355
Acquisition expenses	88,251	69,005	171,533	134,597
Operational expenses	36,402	50,352	78,460	105,448
Corporate expenses	(162)	361	(84)	2,973
Interest expense	2,505	2,515	5,013	5,034
Total expenses	269,583	289,983	590,590	542,407
(Loss) income before equity in net income (loss) of subsidiaries and taxes	234,067	187,443	377,464	372,516
Equity in net income (loss) of subsidiaries	0	0	0	0
Income before taxes	234,067	187,443	377,464	372,516
Income tax expense	(7,172)	(6,366)	(7,903)	(14,843)
Net income	226,895	181,077	369,561	357,673
Net income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Net income attributable to RenaissanceRe	189,283	150,442	297,622	282,447
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	189,283	150,442	297,622	282,447
Consolidating Adjustments
Revenues
Net premiums earned	0	0	0	0
Net investment income	(6,252)	(5,883)	(12,503)	(11,766)
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	0	0	0	0
Total revenues	(6,252)	(5,883)	(12,503)	(11,766)
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	(4,524)	(2,856)	(10,650)	(7,936)
Corporate expenses	0	0	0	0
Interest expense	(141)	(141)	(281)	(281)
Total expenses	(4,665)	(2,997)	(10,931)	(8,217)
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(1,587)	(2,886)	(1,572)	(3,549)
Equity in net income (loss) of subsidiaries	(218,589)	(172,594)	(347,369)	(342,813)
Income before taxes	(220,176)	(175,480)	(348,941)	(346,362)
Income tax expense	0	0	0	0
Net income	(220,176)	(175,480)	(348,941)	(346,362)
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	(220,176)	(175,480)	(348,941)	(346,362)
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	$ (220,176)	$ (175,480)	$ (348,941)	$ (346,362)

Condensed Consolidating Finan68

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 214,350	$ 172,556	$ 346,624	$ 350,737
Change in net unrealized gains on investments	219	672	(1,272)	229
Comprehensive income	214,569	173,228	345,352	350,966
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to RenaissanceRe	176,957	142,593	273,413	275,740
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	2,507	2,097	5,818	3,168
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	2,507	2,097	5,818	3,168
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	2,507	2,097	5,818	3,168
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	17,995	13,967	30,570	37,827
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	17,995	13,967	30,570	37,827
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	17,995	13,967	30,570	37,827
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	10,391	8,974	14,931	22,920
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	10,391	8,974	14,931	22,920
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	10,391	8,974	14,931	22,920
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	176,738	141,921	274,685	275,511
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	176,738	141,921	274,685	275,511
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	176,738	141,921	274,685	275,511
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Condensed Financial Statements, Captions [Line Items]
Net income	226,895	181,077	369,561	357,673
Change in net unrealized gains on investments	219	672	(1,272)	229
Comprehensive income	227,114	181,749	368,289	357,902
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to RenaissanceRe	189,502	151,114	296,350	282,676
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(220,176)	(175,480)	(348,941)	(346,362)
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	(220,176)	(175,480)	(348,941)	(346,362)
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	$ (220,176)	$ (175,480)	$ (348,941)	$ (346,362)

Condensed Consolidating Finan69

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	$ 341,023	$ 125,241
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	5,163,972	4,780,406
Purchases of fixed maturity investments trading	(5,451,362)	(4,984,820)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	5,216
Net sales of equity investments trading	46,305	181,634
Net sales of short term investments	276,075	245,899
Net sales (purchases) of other investments	2,551	(52,778)
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net cash provided by investing activities	37,541	175,557
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(25,877)	(26,198)
Dividends paid – preference shares	(11,191)	(11,191)
RenaissanceRe common share repurchases	(145,940)	(265,003)
Issuance of debt, net of expenses	295,866	0
Repayment of debt	(250,000)	0
Net third party redeemable noncontrolling interest share transactions	(33,655)	(43,909)
Taxes paid on withholding shares	(11,251)	(8,069)
Net cash used in financing activities	(182,048)	(354,370)
Effect of exchange rate changes on foreign currency cash	5,477	2,208
Net increase (decrease) in cash and cash equivalents	201,993	(51,364)
Cash and cash equivalents, beginning of period	421,157	506,885
Cash and cash equivalents, end of period	623,150	455,521
RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	0
Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	(250,000)
RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	0
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows used in financing activities
Repayment of debt	0
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows used in financing activities
Repayment of debt	0
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	(8,931)	297
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	46,475	50,890
Purchases of fixed maturity investments trading	(45,174)	(105,772)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	(89)	(2,195)
Net sales of short term investments	(1,351)	62,403
Net sales (purchases) of other investments	0	0
Dividends and return of capital from subsidiaries	9,175	2,900
Contributions to subsidiaries	0	0
Due (from) to subsidiary	9	(14,396)
Net cash provided by investing activities	9,045	(6,170)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash used in financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	114	(5,873)
Cash and cash equivalents, beginning of period	162	5,908
Cash and cash equivalents, end of period	276	35
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	(5,017)	(3,914)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	289,741	67,839
Purchases of fixed maturity investments trading	(143,991)	(203,883)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	85,324	193,207
Net sales of short term investments	41,299	(58,367)
Net sales (purchases) of other investments	0	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	(41)	(92)
Net cash provided by investing activities	272,332	(1,296)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash used in financing activities	(250,000)	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	17,315	(5,210)
Cash and cash equivalents, beginning of period	6,671	7,103
Cash and cash equivalents, end of period	23,986	1,893
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	(27,713)	(24,197)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	15,449	0
Purchases of fixed maturity investments trading	(265,787)	0
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	0	0
Net sales of short term investments	(28,934)	0
Net sales (purchases) of other investments	0	0
Dividends and return of capital from subsidiaries	17,975	0
Contributions to subsidiaries	(9,175)	0
Due (from) to subsidiary	1,278	24,134
Net cash provided by investing activities	(269,194)	24,134
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	295,866
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash used in financing activities	295,866	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(1,041)	(63)
Cash and cash equivalents, beginning of period	9,397	677
Cash and cash equivalents, end of period	8,356	614
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	(11,924)	(11,131)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	53,654	210,933
Purchases of fixed maturity investments trading	(105,523)	(324,462)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	0	0
Net sales of short term investments	298,768	195,915
Net sales (purchases) of other investments	0	0
Dividends and return of capital from subsidiaries	167,111	341,011
Contributions to subsidiaries	(200,000)	(95,001)
Due (from) to subsidiary	(12,477)	(22,676)
Net cash provided by investing activities	201,533	305,720
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(25,877)	(26,198)
Dividends paid – preference shares	(11,191)	(11,191)
RenaissanceRe common share repurchases	(145,940)	(265,003)
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(11,251)	0
Net cash used in financing activities	(194,259)	(302,392)
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(4,650)	(7,803)
Cash and cash equivalents, beginning of period	7,067	10,185
Cash and cash equivalents, end of period	2,417	2,382
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	394,608	164,186
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	4,758,653	4,450,744
Purchases of fixed maturity investments trading	(4,890,887)	(4,350,703)
Proceeds from sales and maturities of fixed maturity investments available for sale		5,216
Net sales of equity investments trading	(38,930)	(9,378)
Net sales of short term investments	(33,707)	45,948
Net sales (purchases) of other investments	2,551	(52,778)
Dividends and return of capital from subsidiaries	(194,261)	(343,911)
Contributions to subsidiaries	209,175	95,001
Due (from) to subsidiary	11,231	13,030
Net cash provided by investing activities	(176,175)	(146,831)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	(33,655)	(43,909)
Taxes paid on withholding shares	0	(8,069)
Net cash used in financing activities	(33,655)	(51,978)
Effect of exchange rate changes on foreign currency cash	5,477	2,208
Net increase (decrease) in cash and cash equivalents	190,255	(32,415)
Cash and cash equivalents, beginning of period	397,860	483,012
Cash and cash equivalents, end of period	$ 588,115	$ 450,597

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Jul. 01, 2017	Jul. 21, 2017	Jan. 31, 2017	Jun. 30, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, Change from purchase or sale of interests			$ 24
Parent company ownership in redeemable noncontrolling interest				22.60%	22.60%	24.00%	24.00%
Common Shares
Subsequent Event [Line Items]
Common shares repurchased during period, Number of shares				1,100
Common shares repurchased during period, Aggregate amount				$ 149.7
Common shares repurchased during period, Average cost (in dollars per share)				$ 142.33
Subsequent Event | DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, Change from purchase or sale of interests	$ 12
Parent company ownership in redeemable noncontrolling interest	23.50%
Subsequent Event | Common Shares
Subsequent Event [Line Items]
Common shares repurchased during period, Number of shares		15
Common shares repurchased during period, Aggregate amount		$ 2.1
Common shares repurchased during period, Average cost (in dollars per share)		$ 139.93