XML 40 R29.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 9,745,836 $ 10,145,266
Fair Value 9,386,801 10,110,786
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 9,745,836 10,145,266
Gross Unrealized Gains 101,686 221,226
Gross Unrealized Losses 460,721 255,706
Fair Value 9,386,801 10,110,786
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,454,929 5,059,168
Gross Unrealized Gains 12,894 9,109
Gross Unrealized Losses 348,894 236,627
Fair Value 4,118,929 4,831,650
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 134,520 102,709
Gross Unrealized Gains 864 2,089
Gross Unrealized Losses 2,271 158
Fair Value 133,113 104,640
Fixed maturities | Foreign government bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 194,442 133,859
Gross Unrealized Gains 4,527 6,878
Gross Unrealized Losses 4,108 432
Fair Value 194,861 140,305
Fixed maturities | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 565,135 567,829
Gross Unrealized Gains 12,771 31,414
Gross Unrealized Losses 13,044 2,058
Fair Value 564,862 597,185
Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 29,465 29,504
Gross Unrealized Gains 0 615
Gross Unrealized Losses 639 59
Fair Value 28,826 30,060
Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,445,435 1,473,761
Gross Unrealized Gains 29,964 77,379
Gross Unrealized Losses 37,128 3,416
Fair Value 1,438,271 1,547,724
Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 862,681 938,144
Gross Unrealized Gains 16,630 35,327
Gross Unrealized Losses 18,876 3,795
Fair Value 860,435 969,676
Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 285,294 194,201
Gross Unrealized Gains 2,217 5,663
Gross Unrealized Losses 5,674 918
Fair Value 281,837 198,946
Fixed maturities | All other foreign private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 632,478 638,785
Gross Unrealized Gains 15,099 38,030
Gross Unrealized Losses 12,458 3,231
Fair Value 635,119 673,584
Fixed maturities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 543,879 341,277
Gross Unrealized Gains 3,832 4,438
Gross Unrealized Losses 1,276 128
Fair Value 546,435 345,587
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 503,358 502,695
Gross Unrealized Gains 1,733 7,334
Gross Unrealized Losses 14,160 4,345
Fair Value 490,931 505,684
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 94,220 163,334
Gross Unrealized Gains 1,155 2,950
Gross Unrealized Losses 2,193 539
Fair Value 93,182 165,745
OTTI | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 600 12,300
OTTI in AOCI (16) (21)
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 | Public utilities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | Redeemable preferred stock    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other U.S. public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other U.S. private corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other foreign public corporate securities    
Debt Securities, Available-for-sale [Line Items]    
OTTI in AOCI 0 0
OTTI | Fixed maturities | All other 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 (16) (17)
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 $ (4)