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Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Item
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Minimum percent of prepaid reinsurance premiums for any foreign reinsurers that were collateralized 10.00%      
Number of operating segments | Item 2      
Anti-dilutive options | shares 0 0 0  
Change in beginning balance due to adoption of ASU $ 10,139,180 $ 9,726,176 $ 9,132,925  
Accumulated Other Comprehensive Income [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Change in beginning balance due to adoption of ASU 11,523 534,899 28,152 $ (462,557)
Retained Earnings [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Change in beginning balance due to adoption of ASU $ 11,699,836 10,567,452 10,306,571 9,531,433
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Options expiration date Feb. 22, 2022      
Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Options expiration date Sep. 19, 2022      
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Change in beginning balance due to adoption of ASU   $ (4,214)