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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 9,871,624 $ 10,145,266
Fair Value 9,322,358 10,110,786
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 9,871,624 10,145,266
Gross Unrealized Gains 78,615 221,226
Gross Unrealized Losses 627,881 255,706
Fair Value 9,322,358 10,110,786
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,718,446 5,059,168
Gross Unrealized Gains 38 9,109
Gross Unrealized Losses 510,300 236,627
Fair Value 4,208,184 4,831,650
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 134,396 102,709
Gross Unrealized Gains 433 2,089
Gross Unrealized Losses 3,967 158
Fair Value 130,862 104,640
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 223,312 133,859
Gross Unrealized Gains 4,706 6,878
Gross Unrealized Losses 3,653 432
Fair Value 224,365 140,305
Fixed maturities | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 548,257 567,829
Gross Unrealized Gains 10,863 31,414
Gross Unrealized Losses 16,122 2,058
Fair Value 542,998 597,185
Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 29,445 29,504
Gross Unrealized Gains 0 615
Gross Unrealized Losses 786 59
Fair Value 28,659 30,060
Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,391,160 1,473,761
Gross Unrealized Gains 26,213 77,379
Gross Unrealized Losses 35,125 3,416
Fair Value 1,382,248 1,547,724
Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 846,203 938,144
Gross Unrealized Gains 13,898 35,327
Gross Unrealized Losses 20,665 3,795
Fair Value 839,436 969,676
Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 284,819 194,201
Gross Unrealized Gains 2,075 5,663
Gross Unrealized Losses 5,761 918
Fair Value 281,133 198,946
Fixed maturities | All other foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 672,681 638,785
Gross Unrealized Gains 14,883 38,030
Gross Unrealized Losses 16,638 3,231
Fair Value 670,926 673,584
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 510,463 341,277
Gross Unrealized Gains 3,333 4,438
Gross Unrealized Losses 1,685 128
Fair Value 512,111 345,587
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 447,064 502,695
Gross Unrealized Gains 1,137 7,334
Gross Unrealized Losses 11,476 4,345
Fair Value 436,725 505,684
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 65,378 163,334
Gross Unrealized Gains 1,036 2,950
Gross Unrealized Losses 1,703 539
Fair Value 64,711 165,745
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains (1,000) 12,300
OTTI in AOCI (16) (21)
OTTI | Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI (16) (17)
OTTI | Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI $ 0 $ (4)