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Investments (Schedule Of Amortized Cost And Estimated Fair Value Of Fixed Maturities By Contractual Maturity Date) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, amortized cost $ 599,532  
Due after one year through five years, amortized cost 1,874,619  
Due after five years through ten years, amortized cost 1,785,413  
Due after ten years, amortized cost 3,566,332  
Amortized cost, sub-total 7,825,896  
Total fixed maturities, amortized cost 9,209,632 $ 9,929,137
Due in one year or less, estimated fair value 603,525  
Due after one year through five years, estimated fair value 1,923,716  
Due after five years through ten years, estimated fair value 1,871,155  
Due after ten years, estimated fair value 3,722,786  
Estimated fair value, sub-total 8,121,182  
Total fixed maturities, estimated fair value 9,523,164 $ 10,422,882
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, amortized cost 427,372  
Fixed maturities, estimated fair value 429,037  
Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, amortized cost 890,612  
Fixed maturities, estimated fair value 907,645  
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities, amortized cost 65,752  
Fixed maturities, estimated fair value $ 65,300