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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,107,015 $ 4,941,944
Fair Value 5,258,693 5,223,302
Fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,107,015 4,941,944
Gross Unrealized Gains 203,155 300,200
Gross Unrealized Losses 51,477 18,842
Fair Value 5,258,693 5,223,302
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 92,948 95,851
Gross Unrealized Gains 2,953 3,964
Gross Unrealized Losses 10 0
Fair Value 95,891 99,815
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 597,016 597,254
Gross Unrealized Gains 21,248 38,204
Gross Unrealized Losses 492 0
Fair Value 617,772 635,458
Fixed maturities | Foreign government bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 177,188 128,058
Gross Unrealized Gains 3,427 7,536
Gross Unrealized Losses 3,895 496
Fair Value 176,720 135,098
Fixed maturities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 688,996 677,702
Gross Unrealized Gains 42,907 61,588
Gross Unrealized Losses 4,398 1,058
Fair Value 727,505 738,232
Fixed maturities | Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,074 4,053
Gross Unrealized Gains 773 957
Gross Unrealized Losses 0 0
Fair Value 4,847 5,010
Fixed maturities | All other U.S. public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,282,335 1,254,140
Gross Unrealized Gains 62,496 105,524
Gross Unrealized Losses 14,836 2,580
Fair Value 1,329,995 1,357,084
Fixed maturities | All other U.S. private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 694,522 710,424
Gross Unrealized Gains 11,121 18,306
Gross Unrealized Losses 5,904 1,644
Fair Value 699,739 727,086
Fixed maturities | All other foreign public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 227,906 168,399
Gross Unrealized Gains 7,573 12,522
Gross Unrealized Losses 3,473 732
Fair Value 232,006 180,189
Fixed maturities | All other foreign private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 780,001 737,037
Gross Unrealized Gains 43,614 41,405
Gross Unrealized Losses 10,350 9,598
Fair Value 813,265 768,844
Fixed maturities | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 179,037 179,935
Gross Unrealized Gains 2,684 2,519
Gross Unrealized Losses 111 26
Fair Value 181,610 182,428
Fixed maturities | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 316,110 320,223
Gross Unrealized Gains 2,339 5,148
Gross Unrealized Losses 7,097 2,539
Fair Value 311,352 322,832
Fixed maturities | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 66,882 68,868
Gross Unrealized Gains 2,020 2,527
Gross Unrealized Losses 911 169
Fair Value 67,991 71,226
OTTI | Fixed maturities    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 1,200 2,200
OTTI in AOCI, available-for-sale (550) (573)
OTTI | Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Obligations of U.S. states and their political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Foreign government bonds    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Public utilities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Redeemable preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other U.S. public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale (215) (215)
OTTI | Fixed maturities | All other U.S. private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other foreign public corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | All other foreign private corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale (132) (138)
OTTI | Fixed maturities | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale 0 0
OTTI | Fixed maturities | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
OTTI in AOCI, available-for-sale $ (203) $ (220)