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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]      
Current year losses   $ 3,302,013 $ 2,835,129
Catastrophe Losses [Member]      
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]      
Current year losses   $ 270,000  
Covid-19 [Member]      
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]      
Current year losses $ 159,978   $ 309,978