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Statutory Requirements (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2017
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | $ 5,700,000 |  | $ 4,400,000
U.S. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unrestricted net assets | 31,228 |  | 24,109
U.S. | Scenario, Forecast |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Unrestricted net assets |  | $ 31,200 |
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 1,200,000 |  | 1,200,000
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 1,100,000 |  | 1,100,000
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 385,800 |  | 377,000
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 356,900 |  | 326,900
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 50,300 |  | 49,400
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 36,800 |  | 39,700
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | 63,200 |  | 62,000
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Assets held in trust | $ 26,900 |  | $ 46,000
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 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://fasb.org/us-gaap/role/ref/legacyRef -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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