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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Total investments | $ 9,503,439 | $ 9,316,968 |  |
Cash and cash equivalents | 1,361,592 | 421,157 | $ 506,885 | $ 525,584
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,304,622 | 987,323 |  |
Prepaid reinsurance premiums | 533,546 | 441,260 |  |
Reinsurance recoverable | 1,586,630 | 279,564 | 134,526 |
Accrued investment income | 42,235 | 38,076 |  |
Deferred acquisition costs | 426,551 | 335,325 |  |
Receivable for investments sold | 103,145 | 105,841 |  |
Other assets | 121,226 | 175,382 |  |
Goodwill and other intangible assets | 243,145 | 251,186 |  |
Total assets | 15,226,131 | 12,352,082 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 5,080,408 | 2,848,294 | 2,767,045 |
Unearned premiums | 1,477,609 | 1,231,573 |  |
Debt (Note 9) | 989,623 | 948,663 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 989,090 | 673,983 |  |
Payable for investments purchased | 208,749 | 305,714 |  |
Other liabilities | 792,771 | 301,684 |  |
Total liabilities | 9,538,250 | 6,309,911 |  |
Redeemable noncontrolling interests | 1,296,506 | 1,175,594 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,391,375 | 4,866,577 | 4,732,184 |
Total liabilities, noncontrolling interests and shareholders’ equity | 15,226,131 | 12,352,082 |  |
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 14,656 | 7,067 | 10,185 | 5,986
Investments in subsidiaries | 4,105,760 | 4,074,769 |  |
Accrued investment income | 405 | 105 |  |
Receivable for investments sold | 135 | 136 |  |
Other assets | 433,468 | 410,757 |  |
Goodwill and other intangible assets | 124,960 | 130,407 |  |
Total assets | 4,909,252 | 5,017,928 |  |
Liabilities |  |  |  |
Amounts due to subsidiaries and affiliates | 82,579 | 14,644 |  |
Other liabilities | 18,298 | 19,707 |  |
Total liabilities | 517,877 | 151,351 |  |
Shareholders’ Equity |  |  |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 4,909,252 | 5,017,928 |  |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Total investments | 225,266 | 387,274 |  |
Cash and cash equivalents | 14,656 | 7,067 | 10,185 | 5,986
Investments in subsidiaries | 4,105,760 | 4,074,769 |  |
Due from subsidiaries and affiliates | 4,602 | 7,413 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 405 | 105 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 135 | 136 |  |
Other assets | 433,468 | 410,757 |  |
Goodwill and other intangible assets | 124,960 | 130,407 |  |
Total assets | 4,909,252 | 5,017,928 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 9) | 417,000 | 117,000 |  |
Amounts due to subsidiaries and affiliates | 82,579 | 14,644 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 18,298 | 19,707 |  |
Total liabilities | 517,877 | 151,351 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,391,375 | 4,866,577 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 4,909,252 | 5,017,928 |  |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Assets |  |  |  |
Total investments | 9,117,186 | 8,497,948 |  |
Cash and cash equivalents | 1,345,328 | 397,860 | 483,012 | 518,565
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,304,622 | 987,323 |  |
Prepaid reinsurance premiums | 533,546 | 441,260 |  |
Reinsurance recoverable | 1,586,630 | 279,564 |  |
Accrued investment income | 41,320 | 37,025 |  |
Deferred acquisition costs | 426,551 | 335,325 |  |
Receivable for investments sold | 102,951 | 105,559 |  |
Other assets | 76,703 | 118,098 |  |
Goodwill and other intangible assets | 118,185 | 120,779 |  |
Total assets | 14,653,022 | 11,320,741 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 5,080,408 | 2,848,294 |  |
Unearned premiums | 1,477,609 | 1,231,573 |  |
Debt (Note 9) | 147,731 | 147,422 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 989,090 | 673,983 |  |
Payable for investments purchased | 208,749 | 305,714 |  |
Other liabilities | 764,432 | 270,610 |  |
Total liabilities | 8,668,019 | 5,477,596 |  |
Redeemable noncontrolling interests | 1,296,506 | 1,175,594 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,688,497 | 4,667,551 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 14,653,022 | 11,320,741 |  |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 129,732 | 119,163 |  |
Cash and cash equivalents | 139 | 162 | 5,908 | 1,033
Investments in subsidiaries | 36,140 | 34,761 |  |
Due from subsidiaries and affiliates | 91,891 | 91,892 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 428 | 289 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 51 | 2 |  |
Other assets | 21,342 | 37,204 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 279,723 | 283,473 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 9) | 0 | 0 |  |
Amounts due to subsidiaries and affiliates | 54 | 42 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 1,053 | 10,544 |  |
Total liabilities | 1,107 | 10,586 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 278,616 | 272,887 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 279,723 | 283,473 |  |
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments |  | 267,556 |  |
Cash and cash equivalents | 0 | 6,671 | 7,103 | 0
Investments in subsidiaries |  | 843,089 |  |
Due from subsidiaries and affiliates |  | 0 |  |
Premiums receivable |  | 0 |  |
Prepaid reinsurance premiums |  | 0 |  |
Reinsurance recoverable |  | 0 |  |
Accrued investment income |  | 551 |  |
Deferred acquisition costs |  | 0 |  |
Receivable for investments sold |  | 99 |  |
Other assets |  | 4,689 |  |
Goodwill and other intangible assets |  | 0 |  |
Total assets |  | 1,122,655 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) |  | 0 |  |
Unearned premiums |  | 0 |  |
Debt (Note 9) |  | 255,352 |  |
Amounts due to subsidiaries and affiliates |  | 123 |  |
Reinsurance balances payable |  | 0 |  |
Payable for investments purchased |  | 0 |  |
Other liabilities |  | 0 |  |
Total liabilities |  | 255,475 |  |
Redeemable noncontrolling interests |  | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity |  | 867,180 |  |
Total liabilities, noncontrolling interests and shareholders’ equity |  | 1,122,655 |  |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 31,255 | 45,027 |  |
Cash and cash equivalents | 1,469 | 9,397 | $ 677 | $ 0
Investments in subsidiaries | 1,141,733 | 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 | 82 | 106 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 8 | 45 |  |
Other assets | 430,481 | 127,572 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 1,605,028 | 1,347,560 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 9) | 841,892 | 545,889 |  |
Amounts due to subsidiaries and affiliates | 92,794 | 96,061 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 14,117 | 13,350 |  |
Total liabilities | 948,803 | 655,300 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 656,225 | 692,260 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 1,605,028 | 1,347,560 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Total investments | 0 | 0 |  |
Cash and cash equivalents | 0 | 0 |  |
Investments in subsidiaries | (5,283,633) | (6,118,032) |  |
Due from subsidiaries and affiliates | (96,493) | (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 | (840,768) | (522,938) |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | (6,220,894) | (6,740,275) |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 8) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 9) | (417,000) | (117,000) |  |
Amounts due to subsidiaries and affiliates | (175,427) | (110,870) |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | (5,129) | (12,527) |  |
Total liabilities | (597,556) | (240,397) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | (5,623,338) | (6,499,878) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ (6,220,894) | $ (6,740,275) |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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