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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%