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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost $ 10,118,639 $ 9,818,298
Amortized Cost or Cost 14 365
Fair Value 9,968,944 9,362,763
Fair Value 18 18
Fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 10,118,639 9,818,298
Gross Unrealized Gains 211,863 147,795
Gross Unrealized Losses 361,558 603,330
Fair Value 9,968,944 9,362,763
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 5,028,572 4,998,652
Gross Unrealized Gains 5,978 2,487
Gross Unrealized Losses 340,444 536,114
Fair Value 4,694,106 4,465,025
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 101,051 92,107
Gross Unrealized Gains 1,243 566
Gross Unrealized Losses 751 2,699
Fair Value 101,543 89,974
Fixed maturities | Foreign government bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 117,975 64,352
Gross Unrealized Gains 7,240 5,404
Gross Unrealized Losses 80 370
Fair Value 125,135 69,386
Fixed maturities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 548,161 448,349
Gross Unrealized Gains 25,021 13,155
Gross Unrealized Losses 2,964 10,348
Fair Value 570,218 451,156
Fixed maturities | Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 29,524 29,581
Gross Unrealized Gains 867 288
Gross Unrealized Losses 0 633
Fair Value 30,391 29,236
Fixed maturities | All other U.S. public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 1,408,362 1,619,814
Gross Unrealized Gains 82,644 73,819
Gross Unrealized Losses 2,447 10,153
Fair Value 1,488,559 1,683,480
Fixed maturities | All other U.S. private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 1,039,396 951,324
Gross Unrealized Gains 37,163 27,234
Gross Unrealized Losses 5,695 13,810
Fair Value 1,070,864 964,748
Fixed maturities | All other foreign public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 183,645 183,253
Gross Unrealized Gains 6,313 5,410
Gross Unrealized Losses 452 1,022
Fair Value 189,506 187,641
Fixed maturities | All other foreign private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 622,040 501,140
Gross Unrealized Gains 29,557 5,349
Gross Unrealized Losses 4,668 20,450
Fair Value 646,929 486,039
Fixed maturities | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 366,108 248,547
Gross Unrealized Gains 3,546 3,227
Gross Unrealized Losses 53 465
Fair Value 369,601 251,309
Fixed maturities | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 503,210 484,673
Gross Unrealized Gains 8,423 6,793
Gross Unrealized Losses 3,720 6,753
Fair Value 507,913 484,713
Fixed maturities | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 170,595 196,506
Gross Unrealized Gains 3,868 4,063
Gross Unrealized Losses 284 513
Fair Value 174,179 200,056
Equity securities | Mutual fund    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 0 351
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 351
Fair Value 0 0
Equity securities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 14 14
Gross Unrealized Gains 4 4
Gross Unrealized Losses 0 0
Fair Value 18 18
Equity securities | Industrial, miscellaneous, and other    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 14 365
Gross Unrealized Gains 4 4
Gross Unrealized Losses 0 351
Fair Value 18 18
OTTI | Fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 9,000 200
OTTI in AOCI (23) (1,470)
OTTI | Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Obligations of U.S. states and their political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Foreign government bonds    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other U.S. public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 (771)
OTTI | Fixed maturities | All other U.S. private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 (694)
OTTI | Fixed maturities | All other foreign public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other foreign private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI (19) 0
OTTI | Fixed maturities | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI $ (4) $ (5)