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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%