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Fair Value (Tables)
9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Portfolio Investments by Level in the Fair Value Hierarchy
The following table summarizes the levels in the fair value hierarchy that the Company’s portfolio investments fall into as of September 30, 2024:
 TotalLevel ILevel IILevel III
First lien$2,072,485 $— $53,422 $2,019,063 
Second lien250,871 — 59,539 191,332 
Subordinated109,811 — 10,425 99,386 
Equity and other832,104 — — 832,104 
Total investments$3,265,271 $— $123,386 $3,141,885 
The following table summarizes the levels in the fair value hierarchy that the Company’s portfolio investments fall into as of December 31, 2023:
 TotalLevel ILevel IILevel III
First lien$1,683,952 $— $46,063 $1,637,889 
Second lien424,513 — 18,333 406,180 
Subordinated90,948 — 8,077 82,871 
Equity and other811,909 — — 811,909 
Total investments$3,011,322 $— $72,473 $2,938,849 
Changes in Level III Portfolio Investments
The following table summarizes the changes in fair value of Level III portfolio investments for the three months ended September 30, 2024, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at September 30, 2024:
 TotalFirst LienSecond LienSubordinatedEquity and
other
Fair Value, June 30, 2024$3,098,192 $1,973,080 $216,064 $96,653 $812,395 
Total gains or losses included in earnings:
Net realized (losses) gains on investments(1,981)(1,529)— (455)
Net change in unrealized (depreciation) appreciation of investments(4,521)3,513 (451)199 (7,782)
Purchases, including capitalized PIK and revolver fundings170,005 136,054 1,485 2,823 29,643 
Proceeds from sales and paydowns of investments(110,879)(83,124)(25,766)(292)(1,697)
Transfers out of Level III(1)(8,931)(8,931)— — — 
Fair Value, September 30, 2024$3,141,885 $2,019,063 $191,332 $99,386 $832,104 
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period:$(6,029)$2,007 $(452)$197 $(7,781)
(1)As of September 30, 2024, portfolio investments were transferred out of Level III into Level II at fair value as of the beginning of the period in which the reclassification occurred.
The following table summarizes the changes in fair value of Level III portfolio investments for the three months ended September 30, 2023, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at September 30, 2023:
 TotalFirst LienSecond LienSubordinatedEquity and
other
Fair Value, June 30, 2023$3,095,531 $1,693,215 $495,695 $78,960 $827,661 
Total gains or losses included in earnings:
Net realized gains on investments4,671 111 — — 4,560 
Net change in unrealized (depreciation) appreciation of investments(17,113)1,280 9,084 209 (27,686)
Purchases, including capitalized PIK and revolver fundings33,311 26,051 1,244 1,408 4,608 
Proceeds from sales and paydowns of investments(88,751)(39,990)(44,190)— (4,571)
Fair Value, September 30, 2023$3,027,649 $1,680,667 $461,833 $80,577 $804,572 
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period:$(17,605)$1,695 $8,177 $209 $(27,686)

The following table summarizes the changes in fair value of Level III portfolio investments for the nine months ended September 30, 2024, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at September 30, 2024:
 TotalFirst LienSecond LienSubordinatedEquity and
other
Fair Value, December 31, 2023$2,938,849 $1,637,889 $406,180 $82,871 $811,909 
Total gains or losses included in earnings:
Net realized (losses) gains on investments(44,979)(13,267)(35,163)3,448 
Net change in unrealized appreciation (depreciation) of investments31,047 18,233 40,417 (1,240)(26,363)
Purchases, including capitalized PIK and revolver fundings(1)797,225 708,021 13,546 18,044 57,614 
Proceeds from sales and paydowns of investments(1)(608,697)(360,253)(233,648)(292)(14,504)
Transfers into Level III(2)28,440 28,440 — — — 
Fair Value, September 30, 2024$3,141,885 $2,019,063 $191,332 $99,386 $832,104 
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period:$(23,625)$3,908 $347 $(1,242)$(26,638)
(1)Includes non-cash reorganizations and restructurings.
(2)As of September 30, 2024, portfolio investments were transferred into Level III from Level II at fair value as of the beginning of the period in which the reclassification occurred.
The following table summarizes the changes in fair value of Level III portfolio investments for the nine months ended September 30, 2023, as well as the portion of appreciation (depreciation) included in income attributable to the net change in unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at September 30, 2023:
 TotalFirst LienSecond LienSubordinatedEquity and
other
Fair Value, December 31, 2022$3,136,291 $1,753,967 $480,068 $72,842 $829,414 
Total gains or losses included in earnings:
Net realized gains (losses) on investments7,944 (1,244)(24,627)— 33,815 
Net change in unrealized (depreciation) appreciation of investments(15,994)(2,141)31,862 (251)(45,464)
Purchases, including capitalized PIK and revolver fundings(1)216,221 184,157 3,185 7,986 20,893 
Proceeds from sales and paydowns of investments(1)(321,049)(242,582)(44,381)— (34,086)
Transfers into Level III(2)15,726 — 15,726 — — 
Transfers out of Level III(2)(11,490)(11,490)— — — 
Fair Value, September 30, 2023$3,027,649 $1,680,667 $461,833 $80,577 $804,572 
Net change in unrealized (depreciation) appreciation for the period relating to those Level III assets that were still held by the Company at the end of the period:$(35,115)$(4,814)$15,305 $(143)$(45,463)
(1)Includes non-cash reorganizations and restructurings.
(2)As of September 30, 2023, portfolio investments were transferred into Level III from Level II and out of Level III into Level II at fair value as of the beginning of the period in which the reclassification occurred.
Schedule of Fair Value Measurement Inputs and Valuation Techniques
The unobservable inputs used in the fair value measurement of the Company's Level III investments as of September 30, 2024 were as follows:
   Range
TypeFair Value as of September 30, 2024ApproachUnobservable InputLowHighWeighted
Average(1)
First lien$1,796,760 Market & Income ApproachEBITDA multiple5.0x35.0x15.1x
Revenue multiple4.0x19.5x8.0x
 Discount rate6.5 %21.1 %9.7 %
222,303 OtherN/A(2)N/AN/AN/A
Second lien175,751 Market & Income ApproachEBITDA multiple8.6x21.0x18.2x
 Discount rate9.5 %21.0 %11.4 %
15,581 OtherN/A(2)N/AN/AN/A
Subordinated99,386 Market & Income ApproachEBITDA multiple7.7x24.5x16.3x
 Discount rate12.2 %23.8 %16.9 %
Equity and other424,106 Market & Income ApproachEBITDA multiple5.0x32.0x13.0x
Revenue multiple4.5x19.5x7.1x
 Discount rate8.4 %52.6 %9.2 %
397,280 Income ApproachDiscount rate6.3 %12.5 %10.0 %
10,718 OtherN/A(2)N/AN/AN/A
$3,141,885      
(1)Unobservable inputs were weighted by the relative fair value of the investments.
(2)Fair value was determined based on transaction pricing or recent acquisition or sale as the best measure of fair value with no material changes in operations of the related portfolio company since the transaction date.
The unobservable inputs used in the fair value measurement of the Company's Level III investments as of December 31, 2023 were as follows:
   Range
TypeFair Value as of December 31, 2023ApproachUnobservable InputLowHighWeighted
Average(1)
First lien$1,559,300 Market & income approachEBITDA multiple5.0x24.0x15.1x
 Revenue multiple5.0x19.5x10.6x
Discount rate8.6 %22.0 %10.2 %
78,589 OtherN/A(2)N/AN/AN/A
Second lien403,180 Market & income approachEBITDA multiple7.0x20.0x14.4x
Discount rate9.2 %30.0 %12.1 %
3,000 OtherN/A(2)N/AN/AN/A
Subordinated82,871 Market & income approachEBITDA multiple8.0x22.0x16.0x
Discount rate12.9 %20.9 %11.9 %
Equity and other430,828 Market & income approachEBITDA multiple5.5x34.0x12.6x
 Revenue multiple9.0x11.0x10.0x
Discount rate9.8 %43.1 %12.2 %
370,807 Income approachDiscount rate6.4 %12.6 %10.1 %
10,274 OtherN/A(2)N/AN/AN/A
$2,938,849      
(1)Unobservable inputs were weighted by the relative fair value of the investments.
(2)Fair value was determined based on transaction pricing or recent acquisition or sale as the best measure of fair value with no material changes in operations of the related portfolio company since the transaction date.
Schedule of Principal Amounts and Fair Values of Borrowings
The following are the principal amounts and fair values of the Company’s borrowings as of September 30, 2024 and December 31, 2023. Fair value is estimated by discounting remaining payments using applicable current market rates, which take into account changes in the Company’s marketplace credit ratings or market quotes, if available.
As of
 September 30, 2024December 31, 2023
Principal Amount
Fair Value
Principal Amount
Fair Value
Unsecured Notes$990,000 $988,569 $506,500 $490,200 
Holdings Credit Facility407,563 406,072 515,063 511,511 
SBA-guaranteed debentures300,000 270,806 300,000 259,811 
Convertible Notes260,000 263,250 260,000 264,706 
NMFC Credit Facility (1)55,031 54,105 36,813 36,507 
NMNLC Credit Facility II2,908 2,908 2,853 2,846 
DB Credit Facility (2)— — 186,400 184,506 
Total Borrowings$2,015,502 $1,985,710 $1,807,629 $1,750,087 
 
(1)     As of September 30, 2024, the principal amount of the NMFC Credit Facility was $55,031, which includes £26,650 denominated in GBP and €17,400 denominated in EUR that has been converted to U.S. dollars. As of September 30, 2024, the fair value of the NMFC Credit Facility was $54,105, which included £26,659 denominated in GBP and
€16,557 denominated in EUR that has been converted to U.S. dollars. As of December 31, 2023, the principal amount of the NMFC Credit Facility was $36,813, which included £22,850 denominated in GBP and €700 denominated in EUR that has been converted to U.S. dollars. As of December 31, 2023, the fair value of the NMFC Credit Facility was $36,507, which included £22,660 denominated in GBP and €694 denominated in EUR that has been converted to U.S. dollars.
(2)     On September 30, 2024, the Company repaid all amounts outstanding under the DB Credit Facility, including outstanding borrowings and accrued interest, and terminated the DB Credit Facility.
Schedule of Notional Amounts and Fair Values of our Derivative Instruments
The following table summarizes the notional amounts and fair values of the Company's derivative instruments as of September 30, 2024. The Company's derivative instruments are considered Level II investments.
As of September 30, 2024
Notional AmountFair Value
AssetLiability
Derivatives in fair value hedging relationships:
Interest rate swaps$600,000 $8,320 $(781)
Total derivatives designated as hedging instruments$600,000 $8,320 $(781)
Total derivatives$600,000 $8,320 $(781)
Total net derivatives(1)$600,000 $7,539 
(1)As of September 30, 2024, the Company had net derivative assets at fair value subject to such enforceable master netting arrangement in the amount of $7,539 and a collateral balance of $10,370, included in "Payable to broker" on the Consolidated Statements of Assets and Liabilities. If the Company had elected to offset, the net amount would be $0.