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Investments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 6,682,052   $ 6,682,052   $ 6,317,164
Fair Value 6,964,409   6,964,409   6,661,596
Assets held by insurance regulatory requirements 13,900   13,900   14,100
Assets held in trust for the benefit of contractual counterparties 185,600   $ 185,600   160,300
Collateral, market value to principal balance of FHLB (as a percent)     102.00%    
FHLB advance, collateral pledged $ 163,300   $ 163,300   $ 163,900
Number of securities in unrealized loss position (in securities) | security 336   336   109
Total fixed income securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 6,682,052   $ 6,682,052   $ 6,317,164
Allowance for Expected Credit Loss 0 $ 0 0 $ 0 (49)
Gross Unrealized Gains 294,061   294,061   349,140
Gross Unrealized Losses (11,704)   (11,704)   (4,659)
Fair Value 6,964,409   6,964,409   6,661,596
Proceeds from sales of fixed income securities     140,100 448,500  
Gross realized gains, fixed income securities 2,300 7,300 5,300 12,400  
Gross realized losses, fixed income securities 400 3,700 700 5,000  
Impairment charges recognized on securities with the intent to sell 0 $ 0 0 $ 300  
Increase (decrease) in credit allowance for the period     (49)    
U.S. Treasury securities and obligations of U.S. government corporations and agencies          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 235,822   235,822   264,531
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 647   647   1,164
Gross Unrealized Losses (149)   (149)   (2)
Fair Value 236,320   236,320   265,693
Obligations of U.S. states and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 2,339,194   2,339,194   2,083,568
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 161,787   161,787   166,557
Gross Unrealized Losses (2,087)   (2,087)   (256)
Fair Value 2,498,894   2,498,894   2,249,869
Corporate debt securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 2,847,402   2,847,402   2,690,860
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 114,625   114,625   155,156
Gross Unrealized Losses (5,966)   (5,966)   (1,728)
Fair Value 2,956,061   2,956,061   2,844,288
ABS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 154,031   154,031   203,807
Allowance for Expected Credit Loss 0   0   (49)
Gross Unrealized Gains 1,803   1,803   2,946
Gross Unrealized Losses (101)   (101)   (18)
Fair Value 155,733   155,733   206,686
RMBS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 377,315   377,315   425,532
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 4,284   4,284   6,472
Gross Unrealized Losses (2,396)   (2,396)   (838)
Fair Value 379,203   379,203   431,166
CMBS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 318,470   318,470   312,572
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 9,899   9,899   16,055
Gross Unrealized Losses (934)   (934)   (1,125)
Fair Value 327,435   327,435   327,502
CLOs          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 396,070   396,070   310,616
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 952   952   566
Gross Unrealized Losses (65)   (65)   (692)
Fair Value 396,957   396,957   310,490
Foreign government debt          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 13,748   13,748   4,485
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 64   64   224
Gross Unrealized Losses (6)   (6)   0
Fair Value $ 13,806   $ 13,806   4,709
Commercial paper          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost         21,193
Allowance for Expected Credit Loss         0
Gross Unrealized Gains         0
Gross Unrealized Losses         0
Fair Value         $ 21,193