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Investments (Gross Unrealized Losses and Fair Value by Investment Category) (Details) (Fixed Maturity Securities [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value $ 7,990,016 $ 11,635,998
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (344,643) (741,947)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 898,132 1,097,643
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (54,825) (104,035)
Available for sale securities, continuous unrealized loss position, total, fair value 8,888,148 12,733,641
Available for sale securities, continuous unrealized loss position, total, unrealized losses (399,468) (845,982)
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 33,386 32,969
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (1,210) (2,294)
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 33,386 32,969
Available for sale securities, continuous unrealized loss position, total, unrealized losses (1,210) (2,294)
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 618,888 692,320
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (58,157) (88,671)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 340,909 467,309
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (9,091) (32,691)
Available for sale securities, continuous unrealized loss position, total, fair value 959,797 1,159,629
Available for sale securities, continuous unrealized loss position, total, unrealized losses (67,248) (121,362)
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 288,578 614,056
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (14,671) (39,074)
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 288,578 614,056
Available for sale securities, continuous unrealized loss position, total, unrealized losses (14,671) (39,074)
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 77,271 26,298
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (2,472) (3,462)
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 77,271 26,298
Available for sale securities, continuous unrealized loss position, total, unrealized losses (2,472) (3,462)
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 1,126,695 1,690,846
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (40,893) (92,426)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 139,455 153,037
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (9,454) (12,873)
Available for sale securities, continuous unrealized loss position, total, fair value 1,266,150 1,843,883
Available for sale securities, continuous unrealized loss position, total, unrealized losses (50,347) (105,299)
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 2,267,589 3,370,775
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (76,780) (191,245)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 131,419 93,608
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (14,578) (16,088)
Available for sale securities, continuous unrealized loss position, total, fair value 2,399,008 3,464,383
Available for sale securities, continuous unrealized loss position, total, unrealized losses (91,358) (207,333)
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 933,917 1,829,868
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (40,959) (102,758)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 101,402 83,550
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (9,215) (11,547)
Available for sale securities, continuous unrealized loss position, total, fair value 1,035,319 1,913,418
Available for sale securities, continuous unrealized loss position, total, unrealized losses (50,174) (114,305)
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 204,346 428,407
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (11,286) (25,189)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 13,850 17,687
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (840) (1,992)
Available for sale securities, continuous unrealized loss position, total, fair value 218,196 446,094
Available for sale securities, continuous unrealized loss position, total, unrealized losses (12,126) (27,181)
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 566,481 834,699
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (17,716) (51,508)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 97,230 107,242
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (6,692) (10,403)
Available for sale securities, continuous unrealized loss position, total, fair value 663,711 941,941
Available for sale securities, continuous unrealized loss position, total, unrealized losses (24,408) (61,911)
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 64,920 60,840
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses (11,378) (15,415)
Held for investment securities, continuous unrealized loss position, total, fair value 64,920 60,840
Held for investment securities, continuous unrealized loss position, total, unrealized losses (11,378) (15,415)
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 385,500 309,599
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (22,132) (41,080)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 1,080 31,739
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (580) (2,103)
Available for sale securities, continuous unrealized loss position, total, fair value 386,580 341,338
Available for sale securities, continuous unrealized loss position, total, unrealized losses (22,712) (43,183)
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 1,169,178 1,450,143
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (43,622) (83,814)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 27,135 51,099
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (885) (6,001)
Available for sale securities, continuous unrealized loss position, total, fair value 1,196,313 1,501,242
Available for sale securities, continuous unrealized loss position, total, unrealized losses (44,507) (89,815)
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 318,187 356,018
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses (14,745) (20,426)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value 45,652 92,372
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses (3,490) (10,337)
Available for sale securities, continuous unrealized loss position, total, fair value 363,839 448,390
Available for sale securities, continuous unrealized loss position, total, unrealized losses $ (18,235) $ (30,763)