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Reinsurance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Cash collateral pledged $ 110,666 $ 18,609 $ 110,666 $ 18,609 $ 6,563
Total collateral posted for reinsurance business 120,500   120,500   15,000
Cash and Cash Equivalents [Member]          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Total collateral posted for reinsurance business 106,100   106,100   2,000
US Treasury Bond Securities [Member]          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Total collateral posted for reinsurance business 14,400   14,400   13,000
Collateral Reinsurance Agreement          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Cash collateral pledged 106,100   106,100   2,000
Collateral Reinsurance Agreement, Released September 30, 2030          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Cash collateral pledged 101,200   101,200   $ 0
Collateral Reinsurance Agreement, Released March 31, 2021          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Cash collateral pledged 4,900   4,900    
Hollenfels          
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]          
Incurred and paid claims 2,570,000 126,000 10,498,000 7,046,000  
Claims IBNR $ 2,722,000 $ 833,000 $ 26,638,000 $ 11,724,000  
Historical Average Claims Ratios, Period, Maximum     10 years