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Investments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 6,650,315   $ 6,650,315   $ 6,317,164
Fair Value 6,897,734   6,897,734   6,661,596
Assets held by insurance regulatory requirements 13,800   13,800   14,100
Assets held in trust for the benefit of contractual counterparties 187,500   $ 187,500   160,300
Collateral, market value to principal balance of FHLB (as a percent)     102.00%    
FHLB advance, collateral pledged $ 163,700   $ 163,700   $ 163,900
Number of securities in unrealized loss position (in securities) | security 396   396   109
Total fixed income securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost $ 6,650,315   $ 6,650,315   $ 6,317,164
Allowance for Expected Credit Loss (1)   (1)   (49)
Gross Unrealized Gains 262,370   262,370   349,140
Gross Unrealized Losses (14,950)   (14,950)   (4,659)
Fair Value 6,897,734   6,897,734   6,661,596
Proceeds from sales of fixed income securities     246,800 $ 713,100  
Gross realized gains, fixed income securities 1,400 $ 3,400 6,700 15,900  
Gross realized losses, fixed income securities (300) (800) (1,000) (5,900)  
Impairment charges recognized on securities with the intent to sell 0 $ (400) 0 $ (700)  
U.S. Treasury securities and obligations of U.S. government corporations and agencies          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 184,578   184,578   264,531
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 434   434   1,164
Gross Unrealized Losses (277)   (277)   (2)
Fair Value 184,735   184,735   265,693
Obligations of U.S. states and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 2,372,020   2,372,020   2,083,568
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 146,149   146,149   166,557
Gross Unrealized Losses (3,639)   (3,639)   (256)
Fair Value 2,514,530   2,514,530   2,249,869
Corporate debt securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 2,856,671   2,856,671   2,690,860
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 100,264   100,264   155,156
Gross Unrealized Losses (8,438)   (8,438)   (1,728)
Fair Value 2,948,497   2,948,497   2,844,288
ABS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 158,637   158,637   203,807
Allowance for Expected Credit Loss (1)   (1)   (49)
Gross Unrealized Gains 1,337   1,337   2,946
Gross Unrealized Losses (198)   (198)   (18)
Fair Value 159,775   159,775   206,686
RMBS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 337,353   337,353   425,532
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 3,581   3,581   6,472
Gross Unrealized Losses (1,666)   (1,666)   (838)
Fair Value 339,268   339,268   431,166
CMBS          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 319,187   319,187   312,572
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 9,634   9,634   16,055
Gross Unrealized Losses (628)   (628)   (1,125)
Fair Value 328,193   328,193   327,502
CLOs          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost 408,121   408,121   310,616
Allowance for Expected Credit Loss 0   0   0
Gross Unrealized Gains 913   913   566
Gross Unrealized Losses (64)   (64)   (692)
Fair Value 408,970   408,970   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 58   58   224
Gross Unrealized Losses (40)   (40)   0
Fair Value $ 13,766   $ 13,766   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