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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value $ 11,635,998 $ 2,716,900
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (741,947) (33,982)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 1,097,643 443,515
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (104,035) (33,919)
Available for sale, continuous unrealized loss position, total, fair value 12,733,641 3,160,415
Available for sale, continuous unrealized loss position, total, unrealized losses (845,982) (67,901)
Equity Securities, Available For Sale [Member] | Services [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value   0
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses   0
Available for sale, continuous unrealized loss position, 12 months or more, fair value   8,722
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses   (1,403)
Available for sale, continuous unrealized loss position, total, fair value   8,722
Available for sale, continuous unrealized loss position, total, unrealized losses   (1,403)
United States Government Full Faith and Credit [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 32,969  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (2,294)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses 0  
Available for sale, continuous unrealized loss position, total, fair value 32,969  
Available for sale, continuous unrealized loss position, total, unrealized losses (2,294)  
United States Government Sponsored Agencies [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 692,320 973,728
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (88,671) (3,468)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 467,309 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (32,691) 0
Available for sale, continuous unrealized loss position, total, fair value 1,159,629 973,728
Available for sale, continuous unrealized loss position, total, unrealized losses (121,362) (3,468)
United States Municipalities, States and Territories [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 614,056 24,393
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (39,074) (125)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses 0 0
Available for sale, continuous unrealized loss position, total, fair value 614,056 24,393
Available for sale, continuous unrealized loss position, total, unrealized losses (39,074) (125)
Foreign Government Obligations [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 26,298  
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (3,462)  
Available for sale, continuous unrealized loss position, 12 months or more, fair value 0  
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses 0  
Available for sale, continuous unrealized loss position, total, fair value 26,298  
Available for sale, continuous unrealized loss position, total, unrealized losses (3,462)  
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Finance, Insurance and Real Estate [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,690,846 177,962
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (92,426) (4,126)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 153,037 85,709
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (12,873) (8,438)
Available for sale, continuous unrealized loss position, total, fair value 1,843,883 263,671
Available for sale, continuous unrealized loss position, total, unrealized losses (105,299) (12,564)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Manufacturing, Construction and Mining [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 3,370,775 426,120
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (191,245) (4,303)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 93,608 21,975
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (16,088) (1,281)
Available for sale, continuous unrealized loss position, total, fair value 3,464,383 448,095
Available for sale, continuous unrealized loss position, total, unrealized losses (207,333) (5,584)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Utilities and Related Sectors [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,829,868 221,044
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (102,758) (5,187)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 83,550 39,224
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (11,547) (4,212)
Available for sale, continuous unrealized loss position, total, fair value 1,913,418 260,268
Available for sale, continuous unrealized loss position, total, unrealized losses (114,305) (9,399)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Wholesale/Retail Trade [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 428,407 101,790
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (25,189) (784)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 17,687 10,250
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (1,992) (208)
Available for sale, continuous unrealized loss position, total, fair value 446,094 112,040
Available for sale, continuous unrealized loss position, total, unrealized losses (27,181) (992)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Services, Media and Other [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 834,699 264,421
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (51,508) (3,085)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 107,242 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (10,403) 0
Available for sale, continuous unrealized loss position, total, fair value 941,941 264,421
Available for sale, continuous unrealized loss position, total, unrealized losses (61,911) (3,085)
Corporate Securities [Member] | Fixed Maturity Securities [Member] | Insurance [Member]
    
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
Held for investment, continuous unrealized loss position, less than 12 months, fair value 0 0
Held for investment, continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Held for investment, continuous unrealized loss position, 12 months or more, fair value 60,840 61,521
Held for investment, continuous unrealized loss position, 12 months or more, unrealized losses (15,415) (14,567)
Held for investment, continuous unrealized loss position, total, fair value 60,840 61,521
Held for investment, continuous unrealized loss position, total, unrealized losses (15,415) (14,567)
Residential Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 309,599 220,622
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (41,080) (8,679)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 31,739 260,226
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (2,103) (19,049)
Available for sale, continuous unrealized loss position, total, fair value 341,338 480,848
Available for sale, continuous unrealized loss position, total, unrealized losses (43,183) (27,728)
Commercial Mortgage Backed Securities [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 1,450,143 161,582
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (83,814) (1,983)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 51,099 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (6,001) 0
Available for sale, continuous unrealized loss position, total, fair value 1,501,242 161,582
Available for sale, continuous unrealized loss position, total, unrealized losses (89,815) (1,983)
Other Asset Backed Securities [Member] | Fixed Maturity Securities [Member]
    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale, continuous unrealized loss position, less than 12 months, fair value 356,018 145,238
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses (20,426) (2,242)
Available for sale, continuous unrealized loss position, 12 months or more, fair value 92,372 26,131
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses (10,337) (731)
Available for sale, continuous unrealized loss position, total, fair value 448,390 171,369
Available for sale, continuous unrealized loss position, total, unrealized losses $ (30,763) $ (2,973)