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Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value $ 13,357,294 $ 13,101,067
Fixed maturities, fair value 2,102 1,509
Equity securities, market value 108,940 140,210
Equity securities, fair value 1,337,733 1,447,820
Equity index put option contracts 40,705 47,022
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities, market value 91,907 124,295
Equity securities, fair value 1,275,666 1,337,396
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 13,351,768 13,085,304
Fixed maturities, fair value 2,102 1,509
Equity securities, market value 17,033 15,915
Equity securities, fair value 62,067 110,424
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 5,526 15,763
Equity index put option contracts 40,705 47,022
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 816,877 231,038
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 816,877 231,038
Obligations Of U.S. States And Political Subdivisions [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 703,075 824,472
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 703,075 824,472
Corporate Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 4,804,863 4,706,985
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 4,800,930 4,706,985
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 3,933  
Asset-Backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 467,226 341,222
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 467,226 341,222
Commercial Mortgage-Backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 266,299 241,685
Commercial Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 266,299 233,088
Commercial Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value   8,597
Agency Residential [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 2,320,524 2,183,164
Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 2,320,524 2,183,164
Non-Agency Residential [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 898 2,731
Non-Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 898 2,731
Foreign Government Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 1,259,181 1,532,455
Foreign Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 1,259,181 1,532,455
Foreign Corporate Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 2,718,351 3,037,315
Foreign Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value 2,716,758 3,030,149
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities, market value $ 1,593 $ 7,166