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Investments (Amortized Cost, Gross Unrealized Gains And Losses, Fair Value And OTTI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost $ 9,470,795 $ 10,048,100
Fixed maturity securities, fair value 10,215,328 11,263,174
Equity securities available for sale, cost or amortized cost 450,563 434,875
Equity securities available for sale, at fair value 500,057 499,407
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities available for sale, cost or amortized cost 450,563 434,875
Equity securities available for sale, gross unrealized gains 52,118 66,626
Equity securities available for sale, gross unrealized losses (2,624) (2,094)
Equity securities available for sale, at fair value 500,057 499,407
OTTI in AOCI [1] 0 0
Fixed maturity securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 9,470,795 10,048,100
Fixed maturity securities available for sale, gross unrealized gains 845,412 1,235,159
Fixed maturity securities available for sale, unrealized losses (100,879) (20,085)
Fixed maturity securities, fair value 10,215,328 11,263,174
OTTI in AOCI [1] 34,513 40,914
Fixed maturity securities | United States Government and government agencies and authorities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 150,681 172,070
Fixed maturity securities available for sale, gross unrealized gains 3,891 5,201
Fixed maturity securities available for sale, unrealized losses (537) (429)
Fixed maturity securities, fair value 154,035 176,842
OTTI in AOCI [1] 0 0
Fixed maturity securities | States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 647,335 703,167
Fixed maturity securities available for sale, gross unrealized gains 48,389 67,027
Fixed maturity securities available for sale, unrealized losses (94) (353)
Fixed maturity securities, fair value 695,630 769,841
OTTI in AOCI [1] 0 0
Fixed maturity securities | Foreign governments    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 497,785 591,981
Fixed maturity securities available for sale, gross unrealized gains 65,188 74,339
Fixed maturity securities available for sale, unrealized losses (723) (1,457)
Fixed maturity securities, fair value 562,250 664,863
OTTI in AOCI [1] 0 0
Fixed maturity securities | Asset-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 3,499 3,917
Fixed maturity securities available for sale, gross unrealized gains 1,367 1,680
Fixed maturity securities available for sale, unrealized losses (204) (78)
Fixed maturity securities, fair value 4,662 5,519
OTTI in AOCI [1] 1,285 1,570
Fixed maturity securities | Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 7,196,079 7,621,054
Fixed maturity securities available for sale, gross unrealized gains 677,549 1,026,927
Fixed maturity securities available for sale, unrealized losses (95,912) (16,614)
Fixed maturity securities, fair value 7,777,716 8,631,367
OTTI in AOCI [1] 17,885 21,612
Fixed maturity securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 22,169 44,907
Fixed maturity securities available for sale, gross unrealized gains 352 1,109
Fixed maturity securities available for sale, unrealized losses 0 0
Fixed maturity securities, fair value 22,521 46,016
OTTI in AOCI [1] 0 0
Fixed maturity securities | Residential mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 953,247 911,004
Fixed maturity securities available for sale, gross unrealized gains 48,676 58,876
Fixed maturity securities available for sale, unrealized losses (3,409) (1,154)
Fixed maturity securities, fair value 998,514 968,726
OTTI in AOCI [1] 15,343 17,732
Non-redeemable preferred stocks | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities available for sale, cost or amortized cost 437,515 412,575
Equity securities available for sale, gross unrealized gains 45,495 50,975
Equity securities available for sale, gross unrealized losses (2,617) (2,093)
Equity securities available for sale, at fair value 480,393 461,457
OTTI in AOCI [1] 0 0
Common stocks | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities available for sale, cost or amortized cost 13,048 22,300
Equity securities available for sale, gross unrealized gains 6,623 15,651
Equity securities available for sale, gross unrealized losses (7) (1)
Equity securities available for sale, at fair value 19,664 37,950
OTTI in AOCI [1] 0 $ 0
States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities available for sale, amortized cost 647,335  
Fixed maturity securities, fair value $ 695,630  
[1] Represents the amount of OTTI recognized in accumulated other comprehensive income ("AOCI"). Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.