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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Numerator: |  |  |  |  |  |  |  |
Net income available to RenaissanceRe common shareholders | $ 120,752 |  | $ 26,806 |  | $ 271,755 |  | $ 217,280 |
Amount allocated to participating common shareholders | (1,557) | [1] | (376) | [1] | (3,577) | [1] | (3,174) | [1]
Net income allocated to RenaissanceRe common shareholders | $ 119,195 |  | $ 26,430 |  | $ 268,178 |  | $ 214,106 |
Denominator: |  |  |  |  |  |  |  |
Denominator for basic income per RenaissanceRe common share - weighted average common shares | 39,736 |  | 43,372 |  | 40,487 |  | 43,453 |
Per common share equivalents of employee stock options and restricted shares | 659 |  | 871 |  | 662 |  | 850 |
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 40,395 |  | 44,243 |  | 41,149 |  | 44,303 |
Net income available to RenaissanceRe common shareholders per common share – basic, in dollars per share | $ 3.00 |  | $ 0.61 |  | $ 6.62 |  | $ 4.93 |
Net income available to RenaissanceRe common shareholders per common share – diluted, in dollars per share | $ 2.95 |  | $ 0.60 |  | $ 6.52 |  | $ 4.83 |
[1] | Represents earnings attributable to holders of unvested restricted shares issued under the Company’s 2001 Stock Incentive Plan and Non-Employee Director Stock Incentive Plan.

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- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2793-109256 + Details
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