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Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 05, 2021
Dec. 17, 2019
Debt Instrument [Line Items]          
Other assets $ 757,167,000 $ 665,515,000      
Other income (expense) 36,987,000 6,487,000 $ (4,660,000)    
Mt. Logan Re Segregated Accounts [Member]          
Debt Instrument [Line Items]          
Other assets 66,300,000 67,600,000      
Other income (expense) 1,300,000 6,300,000 (800,000)    
Parent Company [Member]          
Debt Instrument [Line Items]          
Other assets 50,061,000 64,692,000      
Other income (expense) $ (185,000) $ 5,833,000 $ 458,000    
Parent Company [Member] | Notes Payable Other Payables [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount       $ 200,000,000 $ 300,000,000
Maturity Date Dec. 01, 2028        
Debt instrument, stated interest rate       1.00% 1.69%