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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Total investments | $ 11,885,747 | $ 9,503,439 |  |
Cash and cash equivalents | 1,107,922 | 1,361,592 | $ 421,157 | $ 506,885
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,537,188 | 1,304,622 |  |
Prepaid reinsurance premiums | 616,185 | 533,546 |  |
Reinsurance recoverable | 2,372,221 | 1,586,630 | 279,564 |
Accrued investment income | 51,311 | 42,235 |  |
Deferred acquisition costs | 476,661 | 426,551 |  |
Receivable for investments sold | 256,416 | 103,145 |  |
Other assets | 135,127 | 121,226 |  |
Goodwill and other intangible assets | 237,418 | 243,145 |  |
Total assets | 18,676,196 | 15,226,131 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 6,076,271 | 5,080,408 | 2,848,294 |
Unearned premiums | 1,716,021 | 1,477,609 |  |
Debt (Note 8) | 991,127 | 989,623 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,902,056 | 989,090 |  |
Payable for investments purchased | 380,332 | 208,749 |  |
Other liabilities | 513,609 | 792,771 |  |
Total liabilities | 11,579,416 | 9,538,250 |  |
Redeemable noncontrolling interests | 2,051,700 | 1,296,506 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 5,045,080 | 4,391,375 | 4,866,577 |
Total liabilities, noncontrolling interests and shareholders’ equity | 18,676,196 | 15,226,131 |  |
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 3,534 | 14,656 | 7,067 | 10,185
Investments in subsidiaries | 4,414,475 | 4,105,760 |  |
Accrued investment income | 1,046 | 405 |  |
Receivable for investments sold | 203 | 135 |  |
Other assets | 458,842 | 433,468 |  |
Goodwill and other intangible assets | 120,476 | 124,960 |  |
Total assets | 5,368,975 | 4,909,252 |  |
Liabilities |  |  |  |
Amounts due to subsidiaries and affiliates | 6,453 | 82,579 |  |
Other liabilities | 17,442 | 18,298 |  |
Total liabilities | 323,895 | 517,877 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 5,045,080 | 4,391,375 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 5,368,975 | 4,909,252 |  |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Total investments | 313,360 | 225,266 |  |
Cash and cash equivalents | 3,534 | 14,656 | 7,067 | 10,185
Investments in subsidiaries | 4,414,475 | 4,105,760 |  |
Due from subsidiaries and affiliates | 57,039 | 4,602 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 1,046 | 405 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 203 | 135 |  |
Other assets | 458,842 | 433,468 |  |
Goodwill and other intangible assets | 120,476 | 124,960 |  |
Total assets | 5,368,975 | 4,909,252 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 8) | 300,000 | 417,000 |  |
Amounts due to subsidiaries and affiliates | 6,453 | 82,579 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 17,442 | 18,298 |  |
Total liabilities | 323,895 | 517,877 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 5,045,080 | 4,391,375 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 5,368,975 | 4,909,252 |  |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Assets |  |  |  |
Total investments | 11,465,660 | 9,117,186 |  |
Cash and cash equivalents | 1,091,434 | 1,345,328 | 397,860 | 483,012
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,537,188 | 1,304,622 |  |
Prepaid reinsurance premiums | 616,185 | 533,546 |  |
Reinsurance recoverable | 2,372,221 | 1,586,630 |  |
Accrued investment income | 49,828 | 41,320 |  |
Deferred acquisition costs | 476,661 | 426,551 |  |
Receivable for investments sold | 232,328 | 102,951 |  |
Other assets | (1,403,636) | 76,703 |  |
Goodwill and other intangible assets | 116,942 | 118,185 |  |
Total assets | 16,554,811 | 14,653,022 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 6,076,271 | 5,080,408 |  |
Unearned premiums | 1,716,021 | 1,477,609 |  |
Debt (Note 8) | 148,041 | 147,731 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 1,902,056 | 989,090 |  |
Payable for investments purchased | 380,308 | 208,749 |  |
Other liabilities | 482,422 | 764,432 |  |
Total liabilities | 10,705,119 | 8,668,019 |  |
Redeemable noncontrolling interests | 2,051,700 | 1,296,506 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 3,797,992 | 4,688,497 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 16,554,811 | 14,653,022 |  |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 77,842 | 129,732 |  |
Cash and cash equivalents | 3,350 | 139 | 162 | 5,908
Investments in subsidiaries | 58,458 | 36,140 |  |
Due from subsidiaries and affiliates | 101,579 | 91,891 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 310 | 428 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 23,885 | 51 |  |
Other assets | 22,571 | 21,342 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 287,995 | 279,723 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 8) | 0 | 0 |  |
Amounts due to subsidiaries and affiliates | 217 | 54 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 24 | 0 |  |
Other liabilities | 5,362 | 1,053 |  |
Total liabilities | 5,603 | 1,107 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 282,392 | 278,616 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 287,995 | 279,723 |  |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Assets |  |  |  |
Total investments | 28,885 | 31,255 |  |
Cash and cash equivalents | 9,604 | 1,469 | $ 9,397 | $ 677
Investments in subsidiaries | 1,215,663 | 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 | 127 | 82 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 0 | 8 |  |
Other assets | 313,636 | 430,481 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 1,567,915 | 1,605,028 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 8) | 843,086 | 841,892 |  |
Amounts due to subsidiaries and affiliates | 102,243 | 92,794 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | 13,918 | 14,117 |  |
Total liabilities | 959,247 | 948,803 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | 608,668 | 656,225 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 1,567,915 | 1,605,028 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Total investments | 0 | 0 |  |
Cash and cash equivalents | 0 | 0 |  |
Investments in subsidiaries | (5,688,596) | (5,283,633) |  |
Due from subsidiaries and affiliates | (158,618) | (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 | 743,714 | (840,768) |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | (5,103,500) | (6,220,894) |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses (Note 7) | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt (Note 8) | (300,000) | (417,000) |  |
Amounts due to subsidiaries and affiliates | (108,913) | (175,427) |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | (5,535) | (5,129) |  |
Total liabilities | (414,448) | (597,556) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders’ Equity |  |  |  |
Total shareholders’ equity | (4,689,052) | (5,623,338) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ (5,103,500) | $ (6,220,894) |  |

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