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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) |  |

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