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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Securities
Dec. 31, 2015
USD ($)
Securities
Unrealized Unrecognized Loss $ 16,215 $ 24,859
Percentage Decline in Fair Value Percentage 1.00%  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,358,111 1,449,183
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (15,651) (19,953)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 15,626 141,580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (406) (4,900)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,373,737 1,590,763
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (16,057) $ (24,853)
Eighty Percent to Ninety-Nine Percent [Member]    
Number of securities in an unrealized/unrecognized loss position | Securities 456 606
Unrealized Unrecognized Loss $ 16,215 $ 22,971
Sixty Percent to Seventy-Nine Percent [Member]    
Number of securities in an unrealized/unrecognized loss position | Securities 0 3
Unrealized Unrecognized Loss $ 0 $ 1,888
Forty Percent to Fifty-Nine Percent [Member]    
Number of securities in an unrealized/unrecognized loss position | Securities 0 0
Unrealized Unrecognized Loss $ 0 $ 0
Twenty Percent to Thirty-Nine Percent [Member]    
Number of securities in an unrealized/unrecognized loss position | Securities 0 0
Unrealized Unrecognized Loss $ 0 $ 0
Zero Percent to Nineteen Percent [Member]    
Number of securities in an unrealized/unrecognized loss position | Securities 0 0
Unrealized Unrecognized Loss $ 0 $ 0
Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,340,672 1,416,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (14,991) (17,915)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 15,626 141,580
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (406) (4,900)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,356,298 1,558,084
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (15,397) (22,815)
Equity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 17,439 32,679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (660) (2,038)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 17,439 32,679
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (660) (2,038)
U.S. Government and Government Agencies [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 6,419 16,006
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (36) (87)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 396
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 6,419 16,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (36) (91)
Foreign Government [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 13,075 1,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (16) (2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 13,075 1,067
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (16) (2)
Obligations of States and Political Subdivisions [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 306,509 28,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5,304) (160)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 306,509 28,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (5,304) (160)
Corporate Securities [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 462,902 761,479
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5,771) (12,671)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4,913 50,382
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (89) (2,850)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 467,815 811,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (5,860) (15,521)
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 189,795 197,477
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (354) (807)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 319 12,022
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1) (111)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 190,114 209,499
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (355) (918)
Commercial Mortgage Backed Securities [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 82,492 146,944
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,021) (2,196)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,645 15,385
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7) (214)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 84,137 162,329
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (1,028) (2,410)
Residential Mortgage Backed Securities [Member] | Afs Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 279,480 264,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2,489) (1,992)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,749 63,395
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (309) (1,721)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 288,229 328,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (2,798) (3,713)
Common Stock [Member] | Equity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 11,271 31,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (305) (1,998)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 11,271 31,148
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (305) (1,998)
Nonredeemable Preferred Stock [Member] | Equity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 6,168 1,531
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (355) (40)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 6,168 1,531
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (355) $ (40)