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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturity Securities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Due in one year or less, amortized cost $ 338,005  
Due after one year through five years, amortized cost 1,464,733  
Due after five years through ten years, amortized cost 2,122,737  
Due after ten years, amortized cost 2,703,059  
Amortized cost, sub-total 6,628,534  
Total fixed maturities, amortized cost 9,203,517 $ 9,448,840
Due in one year or less, estimated fair value 336,972  
Due after one year through five years, estimated fair value 1,537,573  
Due after five years through ten years, estimated fair value 2,306,166  
Due after ten years, estimated fair value 3,085,172  
Estimated fair value, sub-total 7,265,883  
Total fixed maturities, estimated fair value 10,060,472 9,970,909
Commercial mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 1,730,795  
Total fixed maturities, amortized cost 1,730,795 1,761,777
Fixed maturities, estimated fair value 1,878,978  
Total fixed maturities, estimated fair value 1,878,978 1,817,845
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 836,066  
Total fixed maturities, amortized cost 836,066 855,641
Fixed maturities, estimated fair value 907,330  
Total fixed maturities, estimated fair value 907,330 888,073
Asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, amortized cost 8,122  
Total fixed maturities, amortized cost 8,122 11,042
Fixed maturities, estimated fair value 8,281  
Total fixed maturities, estimated fair value $ 8,281 $ 11,048