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Reinsurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Cash collateral pledged $ 110,743 $ 6,563 $ 6,318
Total collateral posted for reinsurance business 120,500 15,000  
Cash and Cash Equivalents [Member]      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Total collateral posted for reinsurance business 106,800 2,000  
US Treasury Bond Securities [Member]      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Total collateral posted for reinsurance business 13,700 13,000  
Collateral Reinsurance Agreement      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Cash collateral pledged 106,800 2,000  
Collateral Reinsurance Agreement, Released September 30, 2030      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Cash collateral pledged 101,200 0  
Collateral Reinsurance Agreement, Released March 31, 2021      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Cash collateral pledged 5,500    
Hollenfels      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Incurred and paid claims 15,004,000 24,380,000 14,800,000
Claims IBNR $ 34,173,000 $ 5,647,000 $ 11,800,000
Historical Average Claims Ratios, Period, Maximum 10 years