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Investments (Tables)
6 Months Ended
Jun. 30, 2021
Investments [Abstract]  
Fixed Maturities, Available-for-sale Securities
The following tables set forth the composition of fixed maturity securities (excluding investments classified as trading), as of the dates indicated:
 June 30, 2021
 Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Allowance for Credit LossesFair
Value
 (in thousands)
Fixed maturities, available-for-sale:
U.S. Treasury securities and obligations of U.S. government authorities and agencies$951,522 $79,339 $97 $$1,030,764 
Obligations of U.S. states and their political subdivisions299,602 18,137 705 317,034 
Foreign government bonds178,724 17,534 517 195,741 
U.S. public corporate securities4,044,844 246,589 12,631 4,278,802 
U.S. private corporate securities2,078,322 115,053 4,114 335 2,188,926 
Foreign public corporate securities974,009 23,647 3,268 994,388 
Foreign private corporate securities1,861,002 115,322 7,408 1,968,916 
Asset-backed securities(1)1,306,017 7,926 891 1,313,052 
Commercial mortgage-backed securities823,769 42,667 5,319 861,117 
Residential mortgage-backed securities(2)69,928 4,144 74,069 
Total fixed maturities, available-for-sale$12,587,739 $670,358 $34,953 $335 $13,222,809 

(1)Includes credit-tranched securities collateralized by loan obligations, auto loans, education loans, equipment leases, home equity loans and other asset types.
(2)Includes publicly-traded agency pass-through securities and collateralized mortgage obligations.
 December 31, 2020
 Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Allowance for Credit LossesFair
Value
 (in thousands)
Fixed maturities, available-for-sale:
U.S. Treasury securities and obligations of U.S. government authorities and agencies$7,283,403 $1,631,715 $12,686 $$8,902,432 
Obligations of U.S. states and their political subdivisions258,135 19,512 156 277,491 
Foreign government bonds153,009 24,378 177,383 
U.S. public corporate securities3,112,420 339,348 1,361 3,450,407 
U.S. private corporate securities1,736,035 155,943 4,706 209 1,887,063 
Foreign public corporate securities513,204 29,029 408 541,825 
Foreign private corporate securities1,338,936 158,227 2,851 477 1,493,835 
Asset-backed securities(1)984,318 9,870 1,605 992,583 
Commercial mortgage-backed securities728,522 57,522 102 785,942 
Residential mortgage-backed securities(2)69,909 5,818 75,724 
Total fixed maturities, available-for-sale$16,177,891 $2,431,362 $23,882 $686 $18,584,685 

(1)Includes credit-tranched securities collateralized by loan obligations, auto loans, education loans, equipment leases and sub-prime mortgages.
(2)Includes publicly-traded agency pass-through securities and collateralized mortgage obligations.
Duration Of Gross Unrealized Losses On Fixed Maturity Securities
The following tables set forth the fair value and gross unrealized losses on available-for-sale fixed maturity securities without an allowance for credit losses aggregated by investment category and length of time that individual fixed maturity securities had been in a continuous unrealized loss position, as of the dates indicated:
 June 30, 2021
Less Than Twelve MonthsTwelve Months or MoreTotal
Fair Value  Gross
  Unrealized  Losses
Fair Value  Gross
  Unrealized  Losses
Fair Value  Gross
  Unrealized  Losses
 (in thousands)
Fixed maturities, available-for-sale:
U.S. Treasury securities and obligations of U.S. government authorities and agencies$74,672 $97 $$$74,672 $97 
Obligations of U.S. states and their political subdivisions8,890 705 8,890 705 
Foreign government bonds19,170 510 83 19,253 517 
U.S. public corporate securities784,696 12,563 1,974 68 786,670 12,631 
U.S. private corporate securities156,480 4,065 2,482 46 158,962 4,111 
Foreign public corporate securities331,329 3,268 331,329 3,268 
Foreign private corporate securities350,529 7,300 2,914 108 353,443 7,408 
Asset-backed securities319,038 874 24,904 17 343,942 891 
Commercial mortgage-backed securities225,557 5,319 225,557 5,319 
Residential mortgage-backed securities33 76 109 
Total fixed maturities, available-for-sale$2,270,394 $34,702 $32,433 $248 $2,302,827 $34,950 
 December 31, 2020
Less Than Twelve MonthsTwelve Months or MoreTotal
Fair Value  Gross
  Unrealized  Losses
Fair Value  Gross
  Unrealized  Losses
Fair Value  Gross
  Unrealized  Losses
 (in thousands)
Fixed maturities, available-for-sale:
U.S. Treasury securities and obligations of U.S. government authorities and agencies$244,507 $12,686 $$$244,507 $12,686 
Obligations of U.S. states and their political subdivisions9,440 156 9,440 156 
Foreign government bonds257 87 344 
U.S. public corporate securities117,755 1,335 2,185 26 119,940 1,361 
U.S. private corporate securities35,411 2,614 16,071 2,092 51,482 4,706 
Foreign public corporate securities69,610 408 69,610 408 
Foreign private corporate securities11,679 188 50,809 2,663 62,488 2,851 
Asset-backed securities219,535 320 246,535 1,285 466,070 1,605 
Commercial mortgage-backed securities45,617 102 45,617 102 
Residential mortgage-backed securities80 80 
Total fixed maturities, available-for-sale$753,811 $17,810 $315,767 $6,072 $1,069,578 $23,882 
Fixed Maturities Classified by Contractual Maturity Date
The following table sets forth the amortized cost and fair value of fixed maturities by contractual maturities, as of the date indicated:
 June 30, 2021
Amortized CostFair Value
 (in thousands)
Fixed maturities, available-for-sale:
Due in one year or less$264,241 $270,212 
Due after one year through five years2,979,491 3,083,315 
Due after five years through ten years3,386,537 3,544,241 
Due after ten years3,757,756 4,076,803 
Asset-backed securities1,306,017 1,313,052 
Commercial mortgage-backed securities823,769 861,117 
Residential mortgage-backed securities69,928 74,069 
Total fixed maturities, available-for-sale$12,587,739 $13,222,809 
Sources of Fixed Maturity Proceeds, Realized Investment Gains (Losses), and Losses on Impairments
The following table sets forth the sources of fixed maturity proceeds and related investment gains (losses), as well as losses on write-downs and the allowance for credit losses of fixed maturities, for the periods indicated:
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2021202020212020
 (in thousands)
Fixed maturities, available-for-sale:
Proceeds from sales(1)$236,301 $136,699 $7,793,433 $332,677 
Proceeds from maturities/prepayments272,769 53,821 411,293 131,901 
Gross investment gains from sales and maturities1,728 10,774 1,138,630 18,255 
Gross investment losses from sales and maturities(5,268)(1,310)(60,617)(1,490)
Write-downs recognized in earnings(2)(22,619)(22,619)(693)
(Addition to) release of allowance for credit losses400 (796)351 (982)

(1)Includes $(255.3) million and $0.2 million of non-cash related proceeds due to the timing of trade settlements for the six months ended June 30, 2021 and 2020, respectively.
(2)Amounts represent write-downs on securities actively marketed for sale.
Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company for which a Portion of the OTTI Loss was Recognized in OCI
The following tables set forth the activity in the allowance for credit losses for fixed maturity securities, as of the dates indicated:
Three Months Ended June 30, 2021
U.S. Treasury Securities and Obligations of U.S. StatesForeign Government BondsU.S. and Foreign Corporate SecuritiesAsset-Backed SecuritiesCommercial Mortgage-Backed SecuritiesResidential Mortgage-Backed SecuritiesTotal
(in thousands)
Fixed maturities, available-for-sale:
Balance, beginning of period$$$735 $$$$735 
Additions to allowance for credit losses not previously recorded
Reductions for securities sold during the period
(7)(7)
Addition (reductions) on securities with previous allowance
(393)(393)
Balance, end of period$$$335 $$$$335 

Three Months Ended June 30, 2020
U.S. Treasury Securities and Obligations of U.S. StatesForeign Government BondsU.S. and Foreign Corporate SecuritiesAsset-Backed SecuritiesCommercial Mortgage-Backed SecuritiesResidential Mortgage-Backed SecuritiesTotal
(in thousands)
Fixed maturities, available-for-sale:
Balance, beginning of period$$$186 $$$$186 
Additions to allowance for credit losses not previously recorded
982 982 
Reductions for securities sold during the period
(2)(2)
Addition (reductions) on securities with previous allowance
(184)(184)
Balance, end of period$$$982 $$$$982 
Six Months Ended June 30, 2021
U.S. Treasury Securities and Obligations of U.S. StatesForeign Government BondsU.S. and Foreign Corporate SecuritiesAsset-Backed SecuritiesCommercial Mortgage-Backed SecuritiesResidential Mortgage-Backed SecuritiesTotal
(in thousands)
Fixed maturities, available-for-sale:
Balance, beginning of period$$$686 $$$$686 
Additions to allowance for credit losses not previously recorded
432 432 
Reductions for securities sold during the period
(13)(13)
Addition (reductions) on securities with previous allowance(770)(770)
Balance, end of period$$$335 $$$$335 

Six Months Ended June 30, 2020
U.S. Treasury Securities and Obligations of U.S. StatesForeign Government BondsU.S. and Foreign Corporate SecuritiesAsset-Backed SecuritiesCommercial Mortgage-Backed SecuritiesResidential Mortgage-Backed SecuritiesTotal
(in thousands)
Fixed maturities, available-for-sale:
Balance, beginning of period$$$$$$$
Additions to allowance for credit losses not previously recorded
1,168 1,168 
Reductions for securities sold during the period
(2)(2)
Addition (reductions) on securities with previous allowance(184)(184)
Balance, end of period$$$982 $$$$982 
Commercial Mortgage and Other Loans
The following table sets forth the composition of “Commercial mortgage and other loans,” as of the dates indicated:
 June 30, 2021December 31, 2020
 Amount
(in thousands)
% of
Total
Amount
(in thousands)
% of
Total
Commercial mortgage and agricultural property loans by property type:
Apartments/Multi-Family$498,244 23.1 %$369,764 20.9 %
Hospitality35,600 1.6 16,679 0.9 
Industrial762,823 35.3 590,231 33.3 
Office388,260 18.0 374,107 21.1 
Other231,623 10.7 187,643 10.6 
Retail136,975 6.4 130,154 7.3 
Total commercial mortgage loans2,053,525 95.1 1,668,578 94.1 
Agricultural property loans105,793 4.9 104,574 5.9 
Total commercial mortgage and agricultural property loans 2,159,318 100.0 %1,773,152 100.0 %
Allowance for credit losses(5,583)(7,382)
Total net commercial mortgage and agricultural property loans $2,153,735 $1,765,770 
Allowance for Credit Losses
The following tables set forth the activity in the allowance for credit losses for commercial mortgage and other loans, as of the dates indicated:
Three Months Ended June 30,
20212020
Commercial Mortgage LoansAgricultural Property LoansTotalCommercial Mortgage LoansAgricultural Property LoansTotal
(in thousands)
Allowance, beginning of period$6,737 $264 $7,001 $6,103 $179 $6,282 
Addition to (release of) allowance for expected losses(1,345)(73)(1,418)598 (1)597 
Allowance, end of period$5,392 $191 $5,583 $6,701 $178 $6,879 

Six Months Ended June 30,
20212020
Commercial Mortgage LoansAgricultural Property LoansTotalCommercial Mortgage LoansAgricultural Property LoansTotal
(in thousands)
Allowance, beginning of period$7,116 $266 $7,382 $2,622 $41 $2,663 
Cumulative effect of adoption of ASU 2016-133,118 39 3,157 
Addition to (release of) allowance for expected losses(1,724)(75)(1,799)961 98 1,059 
Allowance, end of period$5,392 $191 $5,583 $6,701 $178 $6,879 
Financing Receivable Credit Quality Indicators
The following tables set forth key credit quality indicators based upon the recorded investment gross of allowance for credit losses, as of the dates indicated:
June 30, 2021
Amortized Cost by Origination Year
20212020201920182017PriorTotal
(in thousands)
Commercial Mortgage Loans
Loan-to-Value Ratio:
0%-59.99%$72,985 $3,800 $131,266 $42,789 $119,973 $469,790 $840,603 
60%-69.99%99,026 171,906 232,198 52,478 134,709 121,830 812,147 
70%-79.99%112,128 80,070 51,003 10,683 53,865 91,936 399,685 
80% or greater1,090 1,090 
Total$284,139 $255,776 $414,467 $105,950 $308,547 $684,646 $2,053,525 
Debt Service Coverage Ratio:
Greater or Equal to 1.2x$284,139 $255,776 $391,833 $105,950 $296,139 $635,450 $1,969,287 
1.0 - 1.2x022,634 12,408 21,483 56,525 
Less than 1.0x027,713 27,713 
Total$284,139 $255,776 $414,467 $105,950 $308,547 $684,646 $2,053,525 
Agricultural Property Loans
Loan-to-Value Ratio:
0%-59.99%$8,135 $47,138 $13,741 $1,244 $2,708 $30,642 $103,608 
60%-69.99%2,185 2,185 
70%-79.99%
80% or greater
Total$8,135 $49,323 $13,741 $1,244 $2,708 $30,642 $105,793 
Debt Service Coverage Ratio:
Greater or Equal to 1.2x$8,135 $49,323 $13,741 $1,244 $2,708 $27,203 $102,354 
1.0 - 1.2x
Less than 1.0x3,439 3,439 
Total$8,135 $49,323 $13,741 $1,244 $2,708 $30,642 $105,793 
December 31, 2020
Amortized Cost by Origination Year
20202019201820172016PriorTotal
(in thousands)
Commercial Mortgage Loans
Loan-to-Value Ratio:
0%-59.99%$$114,636 $36,423 $116,130 $175,740 $255,848 $698,777 
60%-69.99%174,507 204,112 59,935 90,954 57,569 54,530 641,607 
70%-79.99%81,671 51,333 10,806 80,257 56,169 46,855 327,091 
80% or greater1,103 1,103 
Total$256,178 $370,081 $107,164 $287,341 $289,478 $358,336 $1,668,578 
Debt Service Coverage Ratio:
Greater or Equal to 1.2x$256,178 $347,151 $107,164 $287,341 $274,124 $323,060 $1,595,018 
1.0 - 1.2x22,930 3,969 18,420 45,319 
Less than 1.0x11,385 16,856 28,241 
Total$256,178 $370,081 $107,164 $287,341 $289,478 $358,336 $1,668,578 
Agricultural Property Loans
Loan-to-Value Ratio:
0%-59.99%$47,245 $13,769 $1,255 $7,493 $1,180 $31,370 $102,312 
60%-69.99%2,262 2,262 
70%-79.99%
80% or greater
Total$49,507 $13,769 $1,255 $7,493 $1,180 $31,370 $104,574 
Debt Service Coverage Ratio:
Greater or Equal to 1.2x$49,507 $13,769 $1,255 $4,277 $1,180 $27,783 $97,771 
1.0 - 1.2x
Less than 1.0x3,216 3,587 6,803 
Total$49,507 $13,769 $1,255 $7,493 $1,180 $31,370 $104,574 
Aging of Past Due Commercial Mortgage and Other Loans and Nonaccrual Status
The following tables set forth an aging of past due commercial mortgage and other loans based upon the recorded investment gross of allowance for credit losses, as well as the amount of commercial mortgage and other loans on non-accrual status, as of the dates indicated:
June 30, 2021
Current30-59 Days Past Due60-89 Days Past Due90 Days or More Past Due(1)Total LoansNon-Accrual Status(2)
(in thousands)
Commercial mortgage loans$2,053,525 $$$$2,053,525 $
Agricultural property loans83,562 22,231 105,793 
Total$2,137,087 $22,231 $$$2,159,318 $

(1)As of June 30, 2021, there were no loans in this category accruing interest.
(2)For additional information regarding the Company's policies for accruing interest on loans, see Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020.
December 31, 2020
Current30-59 Days Past Due60-89 Days Past Due90 Days or More Past Due(1)Total LoansNon-Accrual Status(2)
(in thousands)
Commercial mortgage loans$1,668,578 $$$$1,668,578 $
Agricultural property loans104,574 104,574 
Total$1,773,152 $$$$1,773,152 $

(1)As of December 31, 2020, there were no loans in this category accruing interest.
(2)For additional information regarding the Company's policies for accruing interest on loans, see Note 2 to the Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2020.
Other Invested Assets
The following table sets forth the composition of “Other invested assets,” as of the dates indicated:
June 30, 2021December 31, 2020
 (in thousands)
LPs/LLCs:
Equity method:
Private equity$25,844 $28,955 
Hedge funds330,572 340,951 
Real estate-related247,009 244,041 
Subtotal equity method603,425 613,947 
Fair value:
Private equity3,672 4,220 
Hedge funds152 172 
Real estate-related6,616 6,220 
Subtotal fair value10,440 10,612 
Total LPs/LLCs613,865 624,559 
Derivative instruments305,550 194,251 
Total other invested assets$919,415 $818,810 
Accrued Investment Income
The following table sets forth the composition of “Accrued investment income,” as of the dates indicated:
June 30, 2021December 31, 2020
(in thousands)
Fixed maturities$104,552 $116,342 
Equity securities
Commercial mortgage and other loans5,484 4,828 
Policy loans12 11 
Short-term investments and cash equivalents81 158 
Other(1)250 264 
Total accrued investment income$110,380 $121,604 

(1)Primarily includes affiliated accrued income.
Net Investment Income
The following table sets forth “Net investment income” by investment type, for the periods indicated:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
 (in thousands)
Fixed maturities, available-for-sale$91,084 $109,465 $200,125 $210,199 
Fixed maturities, trading19,142 2,921 25,622 5,502 
Equity securities1,332 64 2,284 131 
Commercial mortgage and other loans16,857 15,437 32,126 28,619 
Policy loans260 229 240 356 
Other invested assets24,203 18,579 38,294 5,866 
Short-term investments and cash equivalents(81)18,516 361 43,968 
Gross investment income152,797 165,211 299,052 294,641 
Less: investment expenses(6,849)(6,785)(13,845)(13,178)
Net investment income$145,948 $158,426 $285,207 $281,463 
Realized Investment Gains (Losses), Net
The following table sets forth “Realized investment gains (losses), net” by investment type, for the periods indicated:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
 (in thousands)
Fixed maturities(1)$(25,759)$8,668 $1,055,745 $15,090 
Commercial mortgage and other loans(758)(1,394)(458)(1,736)
Derivatives(812,224)(3,386,059)1,233,336 (4,150,599)
Other invested assets1,823 970 3,568 1,470 
Short-term investments and cash equivalents(46)2,051 (19)2,320 
Realized investment gains (losses), net$(836,964)$(3,375,764)$2,292,172 $(4,133,455)

(1)Includes fixed maturity securities classified as available-for-sale and excludes fixed maturity securities classified as trading.
Net Unrealized Gains and (Losses) on Investments
The following table sets forth net unrealized gains (losses) on investments, as of the dates indicated:
June 30, 2021December 31, 2020
(in thousands)
Fixed maturity securities, available-for-sale with an allowance$1,990 $
Fixed maturity securities, available-for-sale without an allowance633,415 2,407,478 
Derivatives designated as cash flow hedges(1)(17,710)(43,000)
Affiliated notes, available-for-sale3,171 4,629 
Net unrealized gains (losses) on investments$620,866 $2,369,109 

(1)For more information on cash flow hedges, see Note 4.