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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 $ 5,246,007 $ 4,941,944
Fair Value 5,234,708 5,223,302
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,246,007 4,941,944
Gross Unrealized Gains 107,975 300,200
Gross Unrealized Losses 119,274 18,842
Fair Value 5,234,708 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 70,647 95,851
Gross Unrealized Gains 2,008 3,964
Gross Unrealized Losses 19 0
Fair Value 72,636 99,815
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 610,471 597,254
Gross Unrealized Gains 12,030 38,204
Gross Unrealized Losses 3,893 0
Fair Value 618,608 635,458
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 206,359 128,058
Gross Unrealized Gains 2,837 7,536
Gross Unrealized Losses 6,178 496
Fair Value 203,018 135,098
Fixed maturities | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 711,477 677,702
Gross Unrealized Gains 23,424 61,588
Gross Unrealized Losses 15,574 1,058
Fair Value 719,327 738,232
Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,118 4,053
Gross Unrealized Gains 665 957
Gross Unrealized Losses 20 0
Fair Value 4,763 5,010
Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,381,716 1,254,140
Gross Unrealized Gains 39,769 105,524
Gross Unrealized Losses 35,222 2,580
Fair Value 1,386,263 1,357,084
Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 675,995 710,424
Gross Unrealized Gains 4,597 18,306
Gross Unrealized Losses 14,848 1,644
Fair Value 665,744 727,086
Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 258,377 168,399
Gross Unrealized Gains 4,486 12,522
Gross Unrealized Losses 8,094 732
Fair Value 254,769 180,189
Fixed maturities | All other foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 777,245 737,037
Gross Unrealized Gains 13,807 41,405
Gross Unrealized Losses 26,521 9,598
Fair Value 764,531 768,844
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 162,353 179,935
Gross Unrealized Gains 1,885 2,519
Gross Unrealized Losses 223 26
Fair Value 164,015 182,428
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 295,265 320,223
Gross Unrealized Gains 1,093 5,148
Gross Unrealized Losses 6,700 2,539
Fair Value 289,658 322,832
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 91,984 68,868
Gross Unrealized Gains 1,374 2,527
Gross Unrealized Losses 1,982 169
Fair Value 91,376 71,226
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 0 2,200
OTTI in AOCI, available-for-sale (312) (573)
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, available-for-sale 0 0
OTTI | Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 (215)
OTTI | Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale (124) (138)
OTTI | Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI, available-for-sale $ (188) $ (220)