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Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost $ 10,077,628 $ 9,818,298
Amortized Cost or Cost 14 365
Fair Value 9,915,916 9,362,763
Fair Value 18 18
Fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 10,077,628 9,818,298
Gross Unrealized Gains 196,543 147,795
Gross Unrealized Losses 358,255 603,330
Fair Value 9,915,916 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 5,087,545 4,998,652
Gross Unrealized Gains 6,516 2,487
Gross Unrealized Losses 335,998 536,114
Fair Value 4,758,063 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 101,184 92,107
Gross Unrealized Gains 1,207 566
Gross Unrealized Losses 1,318 2,699
Fair Value 101,073 89,974
Fixed maturities | Foreign government bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 110,160 64,352
Gross Unrealized Gains 7,059 5,404
Gross Unrealized Losses 142 370
Fair Value 117,077 69,386
Fixed maturities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 531,414 448,349
Gross Unrealized Gains 22,656 13,155
Gross Unrealized Losses 2,514 10,348
Fair Value 551,556 451,156
Fixed maturities | Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 29,543 29,581
Gross Unrealized Gains 801 288
Gross Unrealized Losses 26 633
Fair Value 30,318 29,236
Fixed maturities | All other U.S. public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 1,501,587 1,619,814
Gross Unrealized Gains 84,445 73,819
Gross Unrealized Losses 3,871 10,153
Fair Value 1,582,161 1,683,480
Fixed maturities | All other U.S. private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 992,696 951,324
Gross Unrealized Gains 34,370 27,234
Gross Unrealized Losses 3,022 13,810
Fair Value 1,024,044 964,748
Fixed maturities | All other foreign public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 167,126 183,253
Gross Unrealized Gains 6,047 5,410
Gross Unrealized Losses 451 1,022
Fair Value 172,722 187,641
Fixed maturities | All other foreign private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 570,959 501,140
Gross Unrealized Gains 18,583 5,349
Gross Unrealized Losses 6,046 20,450
Fair Value 583,496 486,039
Fixed maturities | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 322,294 248,547
Gross Unrealized Gains 3,076 3,227
Gross Unrealized Losses 123 465
Fair Value 325,247 251,309
Fixed maturities | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 483,673 484,673
Gross Unrealized Gains 7,964 6,793
Gross Unrealized Losses 4,304 6,753
Fair Value 487,333 484,713
Fixed maturities | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost or Cost 179,447 196,506
Gross Unrealized Gains 3,819 4,063
Gross Unrealized Losses 440 513
Fair Value 182,826 200,056
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 600 200
OTTI in AOCI (24) (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 $ (5) $ (5)