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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of Investments [Line Items]    
Amortized Cost or Cost $ 4,941,944 $ 5,552,911
Amortized Cost or Cost 20,754 16,390
Fair Value 5,223,302 5,617,549
Fair Value 23,122 16,756
Fixed Maturities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 4,941,944 5,552,911
Gross Unrealized Gains 300,200 167,114
Gross Unrealized Losses 18,842 102,476
Fair Value 5,223,302 5,617,549
Fixed Maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Summary of Investments [Line Items]    
Amortized Cost or Cost 95,851 154,180
Gross Unrealized Gains 3,964 6,593
Gross Unrealized Losses 0 33
Fair Value 99,815 160,740
Fixed Maturities | Obligations of U.S. states and their political subdivisions    
Summary of Investments [Line Items]    
Amortized Cost or Cost 597,254 618,447
Gross Unrealized Gains 38,204 14,592
Gross Unrealized Losses 0 6,553
Fair Value 635,458 626,486
Fixed Maturities | Foreign government bonds    
Summary of Investments [Line Items]    
Amortized Cost or Cost 128,058 111,025
Gross Unrealized Gains 7,536 2,143
Gross Unrealized Losses 496 4,386
Fair Value 135,098 108,782
Fixed Maturities | Public utilities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 677,702 706,536
Gross Unrealized Gains 61,588 33,950
Gross Unrealized Losses 1,058 10,519
Fair Value 738,232 729,967
Fixed Maturities | Redeemable preferred stock    
Summary of Investments [Line Items]    
Amortized Cost or Cost 4,053 4,136
Gross Unrealized Gains 957 834
Gross Unrealized Losses 0 156
Fair Value 5,010 4,814
Fixed Maturities | All other U.S. public corporate securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 1,254,140 1,802,350
Gross Unrealized Gains 105,524 67,908
Gross Unrealized Losses 2,580 28,846
Fair Value 1,357,084 1,841,412
Fixed Maturities | All other U.S. private corporate securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 710,424 714,776
Gross Unrealized Gains 18,306 14,555
Gross Unrealized Losses 1,644 7,702
Fair Value 727,086 721,629
Fixed Maturities | All other foreign public corporate securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 168,399 216,428
Gross Unrealized Gains 12,522 7,371
Gross Unrealized Losses 732 4,127
Fair Value 180,189 219,672
Fixed Maturities | All other foreign private corporate securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 737,037 577,761
Gross Unrealized Gains 41,405 4,866
Gross Unrealized Losses 9,598 33,455
Fair Value 768,844 549,172
Fixed Maturities | Asset-backed securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 179,935 184,414
Gross Unrealized Gains 2,519 5,164
Gross Unrealized Losses 26 562
Fair Value 182,428 189,016
Fixed Maturities | Commercial mortgage-backed securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 320,223 382,717
Gross Unrealized Gains 5,148 5,783
Gross Unrealized Losses 2,539 5,829
Fair Value 322,832 382,671
Fixed Maturities | Residential mortgage-backed securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 68,868 80,141
Gross Unrealized Gains 2,527 3,355
Gross Unrealized Losses 169 308
Fair Value 71,226 83,188
Equity securities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 20,754 16,390
Gross Unrealized Gains 2,368 518
Gross Unrealized Losses 0 152
Fair Value 23,122 16,756
Equity securities | Mutual funds    
Summary of Investments [Line Items]    
Amortized Cost or Cost 20,700 16,324
Gross Unrealized Gains 2,291 441
Gross Unrealized Losses 0 124
Fair Value 22,991 16,641
Equity securities | Public Utility, Equities    
Summary of Investments [Line Items]    
Amortized Cost or Cost 54 66
Gross Unrealized Gains 40 2
Gross Unrealized Losses 0 28
Fair Value 94 40
Equity securities | Industrial, miscellaneous & other    
Summary of Investments [Line Items]    
Amortized Cost or Cost 0 0
Gross Unrealized Gains 37 75
Gross Unrealized Losses 0 0
Fair Value 37 75
OTTI | Fixed Maturities    
Summary of Investments [Line Items]    
Gross Unrealized Gains 2,200 8,100
OTTI in AOCI, available for sale (573) (3,259)
OTTI | Fixed Maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Obligations of U.S. states and their political subdivisions    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Foreign government bonds    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Public utilities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Redeemable preferred stock    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | All other U.S. public corporate securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale (215) (215)
OTTI | Fixed Maturities | All other U.S. private corporate securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 (236)
OTTI | Fixed Maturities | All other foreign public corporate securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | All other foreign private corporate securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Asset-backed securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale (138) (2,534)
OTTI | Fixed Maturities | Commercial mortgage-backed securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale 0 0
OTTI | Fixed Maturities | Residential mortgage-backed securities    
Summary of Investments [Line Items]    
OTTI in AOCI, available for sale $ (220) $ (274)