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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 5,244,903 $ 4,941,944
Fair Value 5,199,595 5,223,302
Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,244,903 4,941,944
Gross Unrealized Gains 96,757 300,200
Gross Unrealized Losses 142,065 18,842
Fair Value 5,199,595 5,223,302
Fixed Maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75,049 95,851
Gross Unrealized Gains 2,427 3,964
Gross Unrealized Losses 6 0
Fair Value 77,470 99,815
Fixed Maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 609,955 597,254
Gross Unrealized Gains 15,154 38,204
Gross Unrealized Losses 2,351 0
Fair Value 622,758 635,458
Fixed Maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 208,009 128,058
Gross Unrealized Gains 2,137 7,536
Gross Unrealized Losses 8,199 496
Fair Value 201,947 135,098
Fixed Maturities | U.S. corporate public securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,739,860 1,634,677
Gross Unrealized Gains 46,166 149,054
Gross Unrealized Losses 54,401 2,642
Fair Value 1,731,625 1,781,089
Fixed Maturities | U.S. corporate private securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 890,748 931,113
Gross Unrealized Gains 11,181 32,180
Gross Unrealized Losses 18,591 2,055
Fair Value 883,338 961,238
Fixed Maturities | Foreign corporate public securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 270,428 170,503
Gross Unrealized Gains 3,746 12,681
Gross Unrealized Losses 12,151 732
Fair Value 262,023 182,452
Fixed Maturities | Foreign corporate private securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 857,604 815,462
Gross Unrealized Gains 9,797 46,387
Gross Unrealized Losses 40,022 10,183
Fair Value 827,379 851,666
Fixed Maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 156,818 179,935
Gross Unrealized Gains 1,528 2,519
Gross Unrealized Losses 750 26
Fair Value 157,596 182,428
Fixed Maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 347,570 320,223
Gross Unrealized Gains 3,353 5,148
Gross Unrealized Losses 4,527 2,539
Fair Value 346,396 322,832
Fixed Maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 88,862 68,868
Gross Unrealized Gains 1,268 2,527
Gross Unrealized Losses 1,067 169
Fair Value 89,063 71,226
OTTI | Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI (299) (573)
Net Unrealized Gains (Losses) (400) 2,200
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. corporate public securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 (215)
OTTI | Fixed Maturities | U.S. corporate private securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed Maturities | Foreign corporate public securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed Maturities | Foreign corporate private 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 (122) (138)
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 $ (177) $ (220)