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Investments (Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost $ 8,709,444 $ 9,470,795
Fixed maturity securities, fair value 9,744,199 10,215,328
Equity securities, cost or amortized cost 382,168 450,563
Equity securities, fair value 434,506 500,057
Fixed maturity securities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 8,709,444 9,470,795
Fixed maturity securities, gross unrealized gains 1,053,397 845,412
Fixed maturity securities, gross unrealized losses (18,642) (100,879)
Fixed maturity securities, fair value 9,744,199 10,215,328
OTTI in AOCI [1] 32,883 34,513
Fixed maturity securities | U.S. government and government agencies and authorities    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 165,841 150,681
Fixed maturity securities, gross unrealized gains 7,158 3,891
Fixed maturity securities, gross unrealized losses (1) (537)
Fixed maturity securities, fair value 172,998 154,035
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, cost or amortized cost 526,189 647,335
Fixed maturity securities, gross unrealized gains 48,884 48,389
Fixed maturity securities, gross unrealized losses 0 (94)
Fixed maturity securities, fair value 575,073 695,630
OTTI in AOCI [1] 0 0
Fixed maturity securities | Foreign governments    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 504,131 497,785
Fixed maturity securities, gross unrealized gains 92,848 65,188
Fixed maturity securities, gross unrealized losses (297) (723)
Fixed maturity securities, fair value 596,682 562,250
OTTI in AOCI [1] 0 0
Fixed maturity securities | Asset-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 2,877 3,499
Fixed maturity securities, gross unrealized gains 1,245 1,367
Fixed maturity securities, gross unrealized losses (221) (204)
Fixed maturity securities, fair value 3,901 4,662
OTTI in AOCI [1] 1,197 1,285
Fixed maturity securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 43,858 22,169
Fixed maturity securities, gross unrealized gains 780 352
Fixed maturity securities, gross unrealized losses 0 0
Fixed maturity securities, fair value 44,638 22,521
OTTI in AOCI [1] 0 0
Fixed maturity securities | Residential mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 878,548 953,247
Fixed maturity securities, gross unrealized gains 69,198 48,676
Fixed maturity securities, gross unrealized losses (67) (3,409)
Fixed maturity securities, fair value 947,679 998,514
OTTI in AOCI [1] 14,585 15,343
Fixed maturity securities | U.S. corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 4,982,779 5,429,783
Fixed maturity securities, gross unrealized gains 630,941 513,254
Fixed maturity securities, gross unrealized losses (13,220) (73,344)
Fixed maturity securities, fair value 5,600,500 5,869,693
OTTI in AOCI [1] 15,060 15,705
Fixed maturity securities | Foreign corporate    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, cost or amortized cost 1,605,221 1,766,296
Fixed maturity securities, gross unrealized gains 202,343 164,295
Fixed maturity securities, gross unrealized losses (4,836) (22,568)
Fixed maturity securities, fair value 1,802,728 1,908,023
OTTI in AOCI [1] 2,041 2,180
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 382,168 450,563
Equity securities, gross unrealized gains 53,405 52,118
Equity securities, gross unrealized losses (1,067) (2,624)
Equity securities, fair value 434,506 500,057
OTTI in AOCI [1] 0 0
Equity securities | Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 12,329 13,048
Equity securities, gross unrealized gains 7,794 6,623
Equity securities, gross unrealized losses (1) (7)
Equity securities, fair value 20,122 19,664
OTTI in AOCI [1] 0 0
Equity securities | Non-redeemable preferred stocks    
Schedule of Available-for-sale Securities [Line Items]    
Equity securities, cost or amortized cost 369,839 437,515
Equity securities, gross unrealized gains 45,611 45,495
Equity securities, gross unrealized losses (1,066) (2,617)
Equity securities, fair value 414,384 480,393
OTTI in AOCI [1] $ 0 $ 0
[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