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Investments (Gross Unrealized Losses and Fair Value by Investment Category) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fixed Maturity Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value $ 10,578,987 $ 2,716,900
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (613,506) (33,982)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 276,727 443,515
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (27,836) (33,919)
Available for sale securities, continuous unrealized loss position, total, fair value 10,855,714 3,160,415
Available for sale securities, continuous unrealized loss position, total, unrealized losses (641,342) (67,901)
Fixed Maturity Securities [Member] | United States Government Full Faith and Credit [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 977  
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (43)  
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0  
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0  
Available for sale securities, continuous unrealized loss position, total, fair value 977  
Available for sale securities, continuous unrealized loss position, total, unrealized losses (43)  
Fixed Maturity Securities [Member] | United States Government Sponsored Agencies [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 1,130,979 973,728
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (78,915) (3,468)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 0
Available for sale securities, continuous unrealized loss position, total, fair value 1,130,979 973,728
Available for sale securities, continuous unrealized loss position, total, unrealized losses (78,915) (3,468)
Fixed Maturity Securities [Member] | United States Municipalities, States and Territories [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 488,260 24,393
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (30,593) (125)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 0
Available for sale securities, continuous unrealized loss position, total, fair value 488,260 24,393
Available for sale securities, continuous unrealized loss position, total, unrealized losses (30,593) (125)
Fixed Maturity Securities [Member] | Foreign Government Obligations [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 26,985  
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (2,792)  
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0  
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0  
Available for sale securities, continuous unrealized loss position, total, fair value 26,985  
Available for sale securities, continuous unrealized loss position, total, unrealized losses (2,792)  
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Finance, Insurance and Real Estate [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 1,291,001 177,962
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (71,692) (4,126)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 119,734 85,709
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (11,273) (8,438)
Available for sale securities, continuous unrealized loss position, total, fair value 1,410,735 263,671
Available for sale securities, continuous unrealized loss position, total, unrealized losses (82,965) (12,564)
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Manufacturing, Construction and Mining [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 2,925,074 426,120
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (161,188) (4,303)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 16,494 21,975
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (2,608) (1,281)
Available for sale securities, continuous unrealized loss position, total, fair value 2,941,568 448,095
Available for sale securities, continuous unrealized loss position, total, unrealized losses (163,796) (5,584)
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Utilities and Related Sectors [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 1,568,088 221,044
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (83,013) (5,187)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 30,766 39,224
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (2,673) (4,212)
Available for sale securities, continuous unrealized loss position, total, fair value 1,598,854 260,268
Available for sale securities, continuous unrealized loss position, total, unrealized losses (85,686) (9,399)
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Wholesale/Retail Trade [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 336,683 101,790
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (20,153) (784)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0 10,250
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 (208)
Available for sale securities, continuous unrealized loss position, total, fair value 336,683 112,040
Available for sale securities, continuous unrealized loss position, total, unrealized losses (20,153) (992)
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Services, Media and Other [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 843,825 264,421
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (44,173) (3,085)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 30,939 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (2,525) 0
Available for sale securities, continuous unrealized loss position, total, fair value 874,764 264,421
Available for sale securities, continuous unrealized loss position, total, unrealized losses (46,698) (3,085)
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Insurance [Member]
   
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]    
Held for investment securities, continuous unrealized loss position, less than 12 months, fair value 0 0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value 60,843 61,521
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses (15,369) (14,567)
Held for investment securities, continuous unrealized loss position, total, fair value 60,843 61,521
Held for investment securities, continuous unrealized loss position, total, unrealized losses (15,369) (14,567)
Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 296,361 220,622
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (23,605) (8,679)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 34,068 260,226
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (2,374) (19,049)
Available for sale securities, continuous unrealized loss position, total, fair value 330,429 480,848
Available for sale securities, continuous unrealized loss position, total, unrealized losses (25,979) (27,728)
Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 1,268,293 161,582
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (79,425) (1,983)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 0 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 0 0
Available for sale securities, continuous unrealized loss position, total, fair value 1,268,293 161,582
Available for sale securities, continuous unrealized loss position, total, unrealized losses (79,425) (1,983)
Fixed Maturity Securities [Member] | Other Asset Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value 402,461 145,238
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (17,914) (2,242)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 44,726 26,131
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (6,383) (731)
Available for sale securities, continuous unrealized loss position, total, fair value 447,187 171,369
Available for sale securities, continuous unrealized loss position, total, unrealized losses (24,297) (2,973)
Equity Securities, Available For Sale [Member] | Services [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value   0
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses   0
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value   8,722
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses   (1,403)
Available for sale securities, continuous unrealized loss position, total, fair value   8,722
Available for sale securities, continuous unrealized loss position, total, unrealized losses   $ (1,403)