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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 11,736,191 $ 10,186,465
Fair Value 11,700,494 9,771,673
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 11,736,191 10,186,465
Gross Unrealized Gains 248,106 86,799
Gross Unrealized Losses 283,803 501,591
Fair Value 11,700,494 9,771,673
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 6,541,281 5,240,519
Gross Unrealized Gains 128,893 20,065
Gross Unrealized Losses 232,980 376,493
Fair Value 6,437,194 4,884,091
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 132,943 133,670
Gross Unrealized Gains 2,309 621
Gross Unrealized Losses 153 3,127
Fair Value 135,099 131,164
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 203,645 199,044
Gross Unrealized Gains 7,991 4,748
Gross Unrealized Losses 162 4,156
Fair Value 211,474 199,636
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,590,583 1,498,130
Gross Unrealized Gains 47,315 26,425
Gross Unrealized Losses 18,172 50,582
Fair Value 1,619,726 1,473,973
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,050,716 1,070,400
Gross Unrealized Gains 24,133 15,430
Gross Unrealized Losses 10,624 22,877
Fair Value 1,064,225 1,062,953
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 297,301 296,029
Gross Unrealized Gains 5,573 1,888
Gross Unrealized Losses 1,626 6,831
Fair Value 301,248 291,086
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 912,013 829,588
Gross Unrealized Gains 18,537 10,415
Gross Unrealized Losses 14,241 27,771
Fair Value 916,309 812,232
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 512,855 505,862
Gross Unrealized Gains 3,353 3,147
Gross Unrealized Losses 3,239 3,765
Fair Value 512,969 505,244
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 411,390 364,601
Gross Unrealized Gains 7,603 2,770
Gross Unrealized Losses 2,260 5,491
Fair Value 416,733 361,880
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 83,464 48,622
Gross Unrealized Gains 2,399 1,290
Gross Unrealized Losses 346 498
Fair Value 85,517 49,414
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI (12) (16)
Net Unrealized Gains (Losses) 3,300 3,300
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 | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | 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 (12) (16)
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 $ 0