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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, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets |  |  |  |
Total investments | $ 9,280,267 | $ 6,743,750 |  |
Cash and cash equivalents | 398,090 | 525,584 | $ 294,457 | $ 408,032
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,068,819 | 440,007 |  |
Prepaid reinsurance premiums | 276,231 | 94,810 |  |
Reinsurance recoverable | 136,464 | 66,694 |  |
Accrued investment income | 37,480 | 26,509 |  |
Deferred acquisition costs | 173,408 | 110,059 |  |
Receivable for investments sold | 149,063 | 52,390 |  |
Other assets | 257,621 | 135,845 |  |
Goodwill and other intangible assets | 275,743 | 7,902 |  |
Total assets | 12,053,186 | 8,203,550 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 2,847,648 | 1,412,510 |  |
Unearned premiums | 1,155,596 | 512,386 |  |
Debt | 972,362 | 249,522 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 512,019 | 454,580 |  |
Payable for investments purchased | 511,251 | 203,021 |  |
Other liabilities | 228,554 | 374,108 |  |
Total liabilities | 6,227,430 | 3,206,127 |  |
Redeemable noncontrolling interests | 988,812 | 1,131,708 |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 4,836,944 | 3,865,715 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 12,053,186 | 8,203,550 |  |
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Assets |  |  |  |
Total investments | 182,375 | 137,006 |  |
Cash and cash equivalents | 2,535 | 5,986 | 3,194 | 8,796
Investments in subsidiaries | 4,550,601 | 3,509,974 |  |
Due from subsidiaries and affiliates | 79,807 | 126,548 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 462 | 0 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 56 | 10 |  |
Other assets | 20,921 | 112,400 |  |
Goodwill and other intangible assets | 267,945 | 0 |  |
Total assets | 5,104,702 | 3,891,924 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 117,000 | 0 |  |
Amounts due to subsidiaries and affiliates | 60,202 | 6,000 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 2,979 | 0 |  |
Other liabilities | 87,577 | 20,209 |  |
Total liabilities | 267,758 | 26,209 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 4,836,944 | 3,865,715 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 5,104,702 | 3,891,924 |  |
Platinum Underwriters Holdings, Ltd. |  |  |  |
Assets |  |  |  |
Total investments | 0 |  |  |
Cash and cash equivalents | 9,181 | 0 |  |
Investments in subsidiaries | 648,991 |  |  |
Due from subsidiaries and affiliates | 27,612 |  |  |
Premiums receivable | 0 |  |  |
Prepaid reinsurance premiums | 0 |  |  |
Reinsurance recoverable | 0 |  |  |
Accrued investment income | 0 |  |  |
Deferred acquisition costs | 0 |  |  |
Receivable for investments sold | 0 |  |  |
Other assets | 0 |  |  |
Goodwill and other intangible assets | 0 |  |  |
Total assets | 685,784 |  |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 |  |  |
Unearned premiums | 0 |  |  |
Debt | 0 |  |  |
Amounts due to subsidiaries and affiliates | 1,872 |  |  |
Reinsurance balances payable | 0 |  |  |
Payable for investments purchased | 0 |  |  |
Other liabilities | 336 |  |  |
Total liabilities | 2,208 |  |  |
Redeemable noncontrolling interests | 0 |  |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 683,576 |  |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 685,784 |  |  |
RenRe North America Holdings Inc. |  |  |  |
Assets |  |  |  |
Total investments | 88,177 | 88,150 |  |
Cash and cash equivalents | 2,146 | 1,033 | 3,211 | 4,027
Investments in subsidiaries | 258,980 | 71,796 |  |
Due from subsidiaries and affiliates | 15 | 23 |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 173 | 121 |  |
Deferred acquisition costs | 0 | 0 |  |
Receivable for investments sold | 21 | 0 |  |
Other assets | 32,250 | 1,242 |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | 381,762 | 162,365 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | 249,568 | 249,522 |  |
Amounts due to subsidiaries and affiliates | 218 | 233 |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 38 | 0 |  |
Other liabilities | 2,380 | 4,013 |  |
Total liabilities | 252,204 | 253,768 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 129,558 | (91,403) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 381,762 | 162,365 |  |
Platinum Underwriters Finance, Inc. |  |  |  |
Assets |  |  |  |
Total investments | 282,027 |  |  |
Cash and cash equivalents | 1,089 | 0 |  |
Investments in subsidiaries | 611,580 |  |  |
Due from subsidiaries and affiliates | 0 |  |  |
Premiums receivable | 0 |  |  |
Prepaid reinsurance premiums | 0 |  |  |
Reinsurance recoverable | 0 |  |  |
Accrued investment income | 307 |  |  |
Deferred acquisition costs | 0 |  |  |
Receivable for investments sold | 151 |  |  |
Other assets | 3,125 |  |  |
Goodwill and other intangible assets | 0 |  |  |
Total assets | 898,279 |  |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 |  |  |
Unearned premiums | 0 |  |  |
Debt | 250,000 |  |  |
Amounts due to subsidiaries and affiliates | 23 |  |  |
Reinsurance balances payable | 0 |  |  |
Payable for investments purchased | 233 |  |  |
Other liabilities | 0 |  |  |
Total liabilities | 250,256 |  |  |
Redeemable noncontrolling interests | 0 |  |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 648,023 |  |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 898,279 |  |  |
RenaissanceRe Finance, Inc. |  |  |  |
Assets |  |  |  |
Total investments | 0 |  |  |
Cash and cash equivalents | 224 | 0 |  |
Investments in subsidiaries | 828,023 |  |  |
Due from subsidiaries and affiliates | 0 |  |  |
Premiums receivable | 0 |  |  |
Prepaid reinsurance premiums | 0 |  |  |
Reinsurance recoverable | 0 |  |  |
Accrued investment income | 0 |  |  |
Deferred acquisition costs | 0 |  |  |
Receivable for investments sold | 0 |  |  |
Other assets | 121,323 |  |  |
Goodwill and other intangible assets | 0 |  |  |
Total assets | 949,570 |  |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 0 |  |  |
Unearned premiums | 0 |  |  |
Debt | 299,415 |  |  |
Amounts due to subsidiaries and affiliates | 407 |  |  |
Reinsurance balances payable | 0 |  |  |
Payable for investments purchased | 0 |  |  |
Other liabilities | 3,357 |  |  |
Total liabilities | 303,179 |  |  |
Redeemable noncontrolling interests | 0 |  |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 646,391 |  |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 949,570 |  |  |
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Assets |  |  |  |
Total investments | 8,727,688 | 6,518,594 |  |
Cash and cash equivalents | 382,915 | 518,565 | $ 288,052 | $ 395,209
Investments in subsidiaries | 0 | 0 |  |
Due from subsidiaries and affiliates | 0 | 0 |  |
Premiums receivable | 1,068,819 | 440,007 |  |
Prepaid reinsurance premiums | 276,231 | 94,810 |  |
Reinsurance recoverable | 136,464 | 66,694 |  |
Accrued investment income | 36,538 | 26,388 |  |
Deferred acquisition costs | 195,291 | 110,059 |  |
Receivable for investments sold | 148,835 | 52,380 |  |
Other assets | 198,964 | 123,661 |  |
Goodwill and other intangible assets | 7,798 | 7,902 |  |
Total assets | 11,179,543 | 7,959,060 |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 2,828,161 | 1,412,510 |  |
Unearned premiums | 1,155,596 | 512,386 |  |
Debt | 148,761 | 0 |  |
Amounts due to subsidiaries and affiliates | 0 | 0 |  |
Reinsurance balances payable | 512,019 | 454,580 |  |
Payable for investments purchased | 508,001 | 203,021 |  |
Other liabilities | 202,854 | 351,344 |  |
Total liabilities | 5,355,392 | 2,933,841 |  |
Redeemable noncontrolling interests | 988,812 | 1,131,708 |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | 4,835,339 | 3,893,511 |  |
Total liabilities, noncontrolling interests and shareholders’ equity | 11,179,543 | 7,959,060 |  |
Consolidating Adjustments |  |  |  |
Assets |  |  |  |
Total investments | 0 | 0 |  |
Cash and cash equivalents | 0 | 0 |  |
Investments in subsidiaries | (6,898,175) | (3,581,770) |  |
Due from subsidiaries and affiliates | (107,434) | (126,571) |  |
Premiums receivable | 0 | 0 |  |
Prepaid reinsurance premiums | 0 | 0 |  |
Reinsurance recoverable | 0 | 0 |  |
Accrued investment income | 0 | 0 |  |
Deferred acquisition costs | (21,883) | 0 |  |
Receivable for investments sold | 0 | 0 |  |
Other assets | (118,962) | (101,458) |  |
Goodwill and other intangible assets | 0 | 0 |  |
Total assets | (7,146,454) | (3,809,799) |  |
Liabilities |  |  |  |
Reserve for claims and claim expenses | 19,487 | 0 |  |
Unearned premiums | 0 | 0 |  |
Debt | (92,382) | 0 |  |
Amounts due to subsidiaries and affiliates | (62,722) | (6,233) |  |
Reinsurance balances payable | 0 | 0 |  |
Payable for investments purchased | 0 | 0 |  |
Other liabilities | (67,950) | (1,458) |  |
Total liabilities | (203,567) | (7,691) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Shareholders' Equity |  |  |  |
Total shareholders’ equity | (6,942,887) | (3,802,108) |  |
Total liabilities, noncontrolling interests and shareholders’ equity | $ (7,146,454) | $ (3,809,799) |  |

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