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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
AFS Fair Value, Less than 12 months $ 1,411,803 $ 125,166
AFS Unrealized Losses, Less than 12 months (49,106) [1] (1,276) [1]
AFS Fair Value, 12 months or longer 40,731 19,736
AFS Unrealized Losses, 12 months or longer (2,865) [1] (1,558) [1]
HTM Fair Value, Less than 12 months 65 1,218
HTM Unrealized Losses, Less than 12 months (5) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 5 [2] 29 [2]
HTM Fair Value, 12 months or longer 2,931 3,968
HTM Unrealized Losses, 12 months or longer (675) [1] (887) [1]
HTM Unrecognized Gains, 12 months or longer 635 [2] 791 [2]
Total AFS and HTM Fair Value, Less than 12 months 1,411,868 126,384
Total AFS and HTM Unrealized Losses, Less than 12 months (49,111) [1] (1,309) [1]
Total AFS and HTM Fair Value, 12 months or longer 43,662 23,704
Total AFS and HTM Unrealized Losses, 12 months or longer (3,540) [1] (2,445) [1]
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 65 1,218
HTM Unrealized Losses, Less than 12 months (5) [1] (33) [1]
HTM Unrecognized Gains, Less than 12 months 5 [2] 29 [2]
HTM Fair Value, 12 months or longer 441 1,108
HTM Unrealized Losses, 12 months or longer (20) [1] (47) [1]
HTM Unrecognized Gains, 12 months or longer 14 [2] 38 [2]
Asset-backed Securities [Member]
    
HTM Fair Value, Less than 12 months 0 0
HTM Unrealized Losses, Less than 12 months 0 [1] 0 [1]
HTM Unrecognized Gains, Less than 12 months 0 [2] 0 [2]
HTM Fair Value, 12 months or longer 2,490 2,860
HTM Unrealized Losses, 12 months or longer (655) [1] (840) [1]
HTM Unrecognized Gains, 12 months or longer 621 [2] 753 [2]
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 1,410,679 109,265
AFS Unrealized Losses, Less than 12 months (49,010) [1] (817) [1]
AFS Fair Value, 12 months or longer 40,731 19,736
AFS Unrealized Losses, 12 months or longer (2,865) [1] (1,558) [1]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 16,955 518
AFS Unrealized Losses, Less than 12 months (500) [1] (1) [1]
AFS Fair Value, 12 months or longer 507 0
AFS Unrealized Losses, 12 months or longer (4) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 2,029 0
AFS Unrealized Losses, Less than 12 months (30) [1] 0 [1]
AFS Fair Value, 12 months or longer 2,955 2,871
AFS Unrealized Losses, 12 months or longer (42) [1] (124) [1]
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 442,531 32,383
AFS Unrealized Losses, Less than 12 months (19,120) [1] (327) [1]
AFS Fair Value, 12 months or longer 13,530 0
AFS Unrealized Losses, 12 months or longer (905) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 511,100 50,880
AFS Unrealized Losses, Less than 12 months (15,911) [1] (402) [1]
AFS Fair Value, 12 months or longer 14,771 0
AFS Unrealized Losses, 12 months or longer (1,138) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member]
    
AFS Fair Value, Less than 12 months 68,725 9,137
AFS Unrealized Losses, Less than 12 months (468) [1] (9) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
AFS Fair Value, Less than 12 months 100,396 7,637
AFS Unrealized Losses, Less than 12 months (2,950) [1] (19) [1]
AFS Fair Value, 12 months or longer 6,298 11,830
AFS Unrealized Losses, 12 months or longer (516) [1] (1,197) [1]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities [Member]
    
AFS Fair Value, Less than 12 months 268,943 8,710
AFS Unrealized Losses, Less than 12 months (10,031) [1] (59) [1]
AFS Fair Value, 12 months or longer 2,670 5,035
AFS Unrealized Losses, 12 months or longer (260) [1] (237) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 1,124 15,901
AFS Unrealized Losses, Less than 12 months (96) [1] (459) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer $ 0 [1] $ 0 [1]
[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position.
[2] Unrecognized holding gains represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security.