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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 $ 5,468,161 $ 5,244,903
Fair Value 5,606,209 5,199,595
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,468,161 5,244,903
Gross Unrealized Gains 198,565 96,757
Gross Unrealized Losses 60,517 142,065
Fair Value 5,606,209 5,199,595
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 77,354 75,049
Gross Unrealized Gains 2,645 2,427
Gross Unrealized Losses 0 6
Fair Value 79,999 77,470
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 608,071 609,955
Gross Unrealized Gains 31,553 15,154
Gross Unrealized Losses 18 2,351
Fair Value 639,606 622,758
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 209,128 208,009
Gross Unrealized Gains 8,172 2,137
Gross Unrealized Losses 2,488 8,199
Fair Value 214,812 201,947
Fixed maturities | U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,926,382 1,739,860
Gross Unrealized Gains 96,244 46,166
Gross Unrealized Losses 17,364 54,401
Fair Value 2,005,262 1,731,625
Fixed maturities | U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 890,441 890,748
Gross Unrealized Gains 19,701 11,181
Gross Unrealized Losses 9,185 18,591
Fair Value 900,957 883,338
Fixed maturities | Foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 289,697 270,428
Gross Unrealized Gains 10,112 3,746
Gross Unrealized Losses 3,953 12,151
Fair Value 295,856 262,023
Fixed maturities | Foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 885,807 857,604
Gross Unrealized Gains 19,955 9,797
Gross Unrealized Losses 25,216 40,022
Fair Value 880,546 827,379
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 148,802 156,818
Gross Unrealized Gains 1,462 1,528
Gross Unrealized Losses 531 750
Fair Value 149,733 157,596
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 345,909 347,570
Gross Unrealized Gains 7,239 3,353
Gross Unrealized Losses 1,379 4,527
Fair Value 351,769 346,396
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 86,570 88,862
Gross Unrealized Gains 1,482 1,268
Gross Unrealized Losses 383 1,067
Fair Value 87,669 89,063
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI (257) (299)
Net Unrealized Gains (Losses) 200 400
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 (85) (122)
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 $ (172) $ (177)