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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Total investments | $ 10,221,704 | $ 9,503,439 |  |
Cash and cash equivalents | 647,973 | 1,361,592 | $ 454,087 | $ 421,157
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,684,630 | 1,304,622 |  |
Prepaid reinsurance premiums | 794,921 | 533,546 |  |
Reinsurance recoverable | 1,572,321 | 1,586,630 | 325,819 |
Accrued investment income | 43,069 | 42,235 |  |
Deferred acquisition costs | 477,010 | 426,551 |  |
Receivable for investments sold | 111,431 | 103,145 |  |
Other assets | 127,571 | 121,226 |  |
Goodwill and other intangible assets | 241,572 | 243,145 |  |
Total assets | 15,922,202 | 15,226,131 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 4,912,727 | 5,080,408 | 2,934,688 |
Unearned premiums | 1,961,746 | 1,477,609 |  |
Debt | 989,995 | 989,623 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,758,948 | 989,090 |  |
Payable for investments purchased | 306,664 | 208,749 |  |
Other liabilities | 130,505 | 792,771 |  |
Total liabilities | 10,060,585 | 9,538,250 |  |
Redeemable noncontrolling interests | 1,425,364 | 1,296,506 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,436,253 | 4,391,375 | 4,860,837 |
Total liabilities, noncontrolling interests and shareholders’ equity | 15,922,202 | 15,226,131 |  |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 112,716 | 129,732 |  |
Cash and cash equivalents | 97 | 139 | 164 | 162
Investments in subsidiaries | 53,476 | 36,140 |  |
Due from subsidiaries and affiliates | 91,891 | 91,891 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 223 | 428 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 0 | 51 |  |
Other assets | 21,340 | 21,342 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 279,743 | 279,723 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 0 | 0 |  |
Amounts due to subsidiaries and affiliates | 61 | 54 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 793 | 1,053 |  |
Total liabilities | 854 | 1,107 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 278,889 | 278,616 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 279,743 | 279,723 |  |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 22,433 | 31,255 |  |
Cash and cash equivalents | 1,175 | 1,469 | 6,080 | 9,397
Investments in subsidiaries | 1,137,922 | 1,141,733 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 46 | 82 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 6 | 8 |  |
Other assets | 433,056 | 430,481 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 1,594,638 | 1,605,028 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 842,188 | 841,892 |  |
Amounts due to subsidiaries and affiliates | 106,900 | 92,794 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 9,457 | 14,117 |  |
Total liabilities | 958,545 | 948,803 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 636,093 | 656,225 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 1,594,638 | 1,605,028 |  |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Total investments | 70,641 | 225,266 |  |
Cash and cash equivalents | 8,150 | 14,656 | 4,177 | 7,067
Investments in subsidiaries | 4,090,065 | 4,105,760 |  |
Due from subsidiaries and affiliates | 137,639 | 4,602 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 16 | 405 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 48 | 135 |  |
Other assets | 439,667 | 433,468 |  |
Goodwill and other intangible assets | 123,728 | 124,960 |  |
Total assets | 4,869,954 | 4,909,252 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 417,000 | 417,000 |  |
Amounts due to subsidiaries and affiliates | 9,639 | 82,579 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 7,062 | 18,298 |  |
Total liabilities | 433,701 | 517,877 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,436,253 | 4,391,375 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 4,869,954 | 4,909,252 |  |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Assets |  |  |  |
Total investments | 10,015,914 | 9,117,186 |  |
Cash and cash equivalents | 638,551 | 1,345,328 | $ 439,502 | $ 397,860
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,684,630 | 1,304,622 |  |
Prepaid reinsurance premiums | 794,921 | 533,546 |  |
Reinsurance recoverable | 1,572,321 | 1,586,630 |  |
Accrued investment income | 42,784 | 41,320 |  |
Deferred acquisition costs | 477,010 | 426,551 |  |
Receivable for investments sold | 111,377 | 102,951 |  |
Other assets | 82,133 | 76,703 |  |
Goodwill and other intangible assets | 117,844 | 118,185 |  |
Total assets | 15,537,485 | 14,653,022 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 4,912,727 | 5,080,408 |  |
Unearned premiums | 1,961,746 | 1,477,609 |  |
Debt | 147,807 | 147,731 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,758,948 | 989,090 |  |
Payable for investments purchased | 306,664 | 208,749 |  |
Other liabilities | 119,676 | 764,432 |  |
Total liabilities | 9,207,568 | 8,668,019 |  |
Redeemable noncontrolling interests | 1,425,364 | 1,296,506 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 4,904,553 | 4,688,497 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 15,537,485 | 14,653,022 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Total investments | 0 | 0 |  |
Cash and cash equivalents | 0 | 0 |  |
Investments in subsidiaries | (5,281,463) | (5,283,633) |  |
Due from subsidiaries and affiliates | (229,530) | (96,493) |  |
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 | (848,625) | (840,768) |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | (6,359,618) | (6,220,894) |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | (417,000) | (417,000) |  |
Amounts due to subsidiaries and affiliates | (116,600) | (175,427) |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | (6,483) | (5,129) |  |
Total liabilities | (540,083) | (597,556) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | (5,819,535) | (5,623,338) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ (6,359,618) | $ (6,220,894) |  |

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