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Statutory Requirements (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Statutory Accounting Practices [Line Items] |  |  |  |
Decrease in statutory capital requirement | $ 500,000 |  |  |
Assets held in trust |  | $ 4,400,000 |  | $ 2,700,000
Bermuda |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Early warning level threshold, percent of risk-based capital model of BMA |  | 120.00% |  |
Unrestricted net assets |  | $ 790,177 |  | 867,624
U.S. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Unrestricted net assets |  | 24,109 |  | 25,375
U.S. | Scenario, Forecast |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Unrestricted net assets |  |  | $ 24,100 |
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 1,200,000 |  | 673,200
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 1,100,000 |  | 608,300
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 377,000 |  | 136,700
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 326,900 |  | 90,400
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 49,400 |  | 39,500
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 39,700 |  | 14,900
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | 62,000 |  | 19,100
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Assets held in trust |  | $ 46,000 |  | $ 14,100
FLORIDA | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Multi-beneficiary reduced collateral reinsurance trust collateral reduction |  | 20.00% |  |
FLORIDA | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Multi-beneficiary reduced collateral reinsurance trust collateral reduction |  | 50.00% |  |

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- Definition Reduction in collateral requirements of multi-beneficiary reinsurance trust to the percentage noted of the net outstanding insurance liabilities. + References No definition available. + Details
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- Definition Statutory Accounting Practices, Statutory Capital and Surplus Required, Early Warning Level, Percent of Model + References No definition available. + Details
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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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