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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2023
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 December 31, 2023:
| Total |  | Level I |  | Level II |  | Level III
First lien | $ | 1,683,952 |  |  | $ | — |  |  | $ | 46,063 |  |  | $ | 1,637,889 |
Second lien | 424,513 |  |  | — |  |  | 18,333 |  |  | 406,180 |
Subordinated | 90,948 |  |  | — |  |  | 8,077 |  |  | 82,871 |
Equity and other | 811,909 |  |  | — |  |  | — |  |  | 811,909 |
Total investments | $ | 3,011,322 |  |  | $ | — |  |  | $ | 72,473 |  |  | $ | 2,938,849 |
The following table summarizes the levels in the fair value hierarchy that the Company's portfolio investments fall into as of December 31, 2022:
| Total |  | Level I |  | Level II |  | Level III
First lien | $ | 1,753,967 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,753,967 |
Second lien | 561,207 |  |  | — |  |  | 81,139 |  |  | 480,068 |
Subordinated | 76,659 |  |  | — |  |  | 3,817 |  |  | 72,842 |
Equity and other | 829,414 |  |  | — |  |  | — |  |  | 829,414 |
Total investments | $ | 3,221,247 |  |  | $ | — |  |  | $ | 84,956 |  |  | $ | 3,136,291 |
Changes in Level III Portfolio Investments | The following table summarizes the changes in fair value of Level III portfolio investments for the year ended December 31, 2023, as well as the portion of appreciation (depreciation) included in income attributable to unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at December 31, 2023:
| Total |  | First Lien |  | Second Lien |  | Subordinated |  | Equity 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 (losses) gains on investments | (33,048) |  |  | (41,767) |  |  | (24,627) |  |  | — |  |  | 33,346 |
Net change in unrealized appreciation (depreciation) of investments | 17,017 |  |  | 41,311 |  |  | 24,005 |  |  | (112) |  |  | (48,187) |
Purchases, including capitalized PIK and revolver fundings(1) | 349,003 |  |  | 302,949 |  |  | 4,484 |  |  | 10,141 |  |  | 31,429 |
Proceeds from sales and paydowns of investments(1) | (582,011) |  |  | (407,081) |  |  | (140,837) |  |  | — |  |  | (34,093) |
Transfers into Level III(2) | 63,087 |  |  | — |  |  | 63,087 |  |  | — |  |  | — |
Transfers out of Level III(2) | (11,490) |  |  | (11,490) |  |  | — |  |  | — |  |  | — |
Fair value, December 31, 2023 | $ | 2,938,849 |  |  | $ | 1,637,889 |  |  | $ | 406,180 |  |  | $ | 82,871 |  |  | $ | 811,909 |
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: | $ | (34,144) |  |  | $ | 12,890 |  |  | $ | 1,625 |  |  | $ | (4) |  |  | $ | (48,655) |
(1)Includes non-cash reorganizations and restructurings. (2)As of December 31, 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. The following table summarizes the changes in fair value of Level III portfolio investments for the year ended December 31, 2022, as well as the portion of appreciation (depreciation) included in income attributable to unrealized appreciation (depreciation) related to those assets and liabilities still held by the Company at December 31, 2022:
| Total |  | First Lien |  | Second Lien |  | Subordinated |  | Equity and other
Fair value, December 31, 2021 | $ | 2,843,456 |  |  | $ | 1,635,143 |  |  | $ | 319,120 |  |  | $ | 50,742 |  |  | $ | 838,451 |
Total gains or losses included in earnings: |  |  |  |  |  |  |  |  |
Net realized gains on investments | 52,934 |  |  | 12,351 |  |  | — |  |  | — |  |  | 40,583 |
Net change in unrealized (depreciation) appreciation of investments | (70,607) |  |  | (33,350) |  |  | (42,375) |  |  | (4,318) |  |  | 9,436 |
Purchases, including capitalized PIK and revolver fundings | 693,202 |  |  | 621,319 |  |  | 9,187 |  |  | 26,418 |  |  | 36,278 |
Proceeds from sales and paydowns of investments | (604,861) |  |  | (493,579) |  |  | (15,948) |  |  | — |  |  | (95,334) |
Transfers into Level III(1) | 222,167 |  |  | 12,083 |  |  | 210,084 |  |  | — |  |  | — |
Fair value, December 31, 2022 | $ | 3,136,291 |  |  | $ | 1,753,967 |  |  | $ | 480,068 |  |  | $ | 72,842 |  |  | $ | 829,414 |
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: | $ | (30,244) |  |  | $ | (36,175) |  |  | $ | (42,817) |  |  | $ | (4,318) |  |  | $ | 53,066 |
(1)As of December 31, 2022, 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.
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 December 31, 2023 were as follows:
|  |  |  |  |  |  | Range
Type | Fair Value as of December 31, 2023 |  | Approach |  | Unobservable Input |  | Low |  | High |  | Weighted Average (1)
First lien | $ | 1,559,300 |  |  | Market & income approach |  | EBITDA multiple |  | 5.0x |  | 24.0x |  | 15.1x
|  |  |  |  | Revenue multiple |  | 5.0x |  | 19.5x |  | 10.6x
|  |  |  |  | Discount rate |  | 8.6 | % |  | 22.0 | % |  | 10.2 | %
| 78,589 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Second lien | 403,180 |  |  | Market & income approach |  | EBITDA multiple |  | 7.0x |  | 20.0x |  | 14.4x
|  |  |  |  | Discount rate |  | 9.2 | % |  | 30.0 | % |  | 12.1 | %
| 3,000 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Subordinated | 82,871 |  |  | Market & income approach |  | EBITDA multiple |  | 8.0x |  | 22.0x |  | 16.0x
|  |  |  |  | Discount rate |  | 12.9 | % |  | 20.9 | % |  | 11.9 | %
Equity and other | 430,828 |  |  | Market & income approach |  | EBITDA multiple |  | 5.5x |  | 34.0x |  | 12.6x
|  |  |  |  | Revenue multiple |  | 9.0x |  | 11.0x |  | 10.0x
|  |  |  |  | Discount rate |  | 9.8 | % |  | 43.1 | % |  | 12.2 | %
| 370,807 |  |  | Income approach |  | Discount rate |  | 6.4 | % |  | 12.6 | % |  | 10.1 | %
| 10,274 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/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. The unobservable inputs used in the fair value measurement of the Company's Level III investments as of December 31, 2022 were as follows:
|  |  |  |  |  |  | Range
Type | Fair Value as of December 31, 2022 |  | Approach |  | Unobservable Input |  | Low |  | High |  | Weighted Average (1)
First lien | $ | 1,663,116 |  |  | Market & income approach |  | EBITDA multiple |  | 4.8x |  | 38.0x |  | 15.3x
|  |  |  |  | Revenue multiple |  | 5.0x |  | 19.5x |  | 9.5x
|  |  |  |  | Discount rate |  | 8.3 | % |  | 29.4 | % |  | 11.1 | %
| 90,851 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Second lien | 471,350 |  |  | Market & income approach |  | EBITDA multiple |  | 8.2x |  | 32.0x |  | 15.2x
|  |  |  |  | Discount rate |  | 11.2 | % |  | 47.1 | % |  | 13.7 | %
| 8,718 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
Subordinated | 72,842 |  |  | Market & income approach |  | EBITDA multiple |  | 8.0x |  | 23.5x |  | 16.3x
|  |  |  |  | Discount rate |  | 13.5 | % |  | 29.7 | % |  | 17.0 | %
Equity and other | 793,468 |  | Market & income approach |  | EBITDA multiple |  | 4.8x |  | 26.5x |  | 13.0x
|  |  |  |  | Revenue multiple |  | 10.5x |  | 19.5x |  | 14.6x
|  |  |  |  | Discount rate |  | 6.4 | % |  | 44.0 | % |  | 13.0 | %
| 35,946 |  |  | Other |  | N/A(2) |  | N/A |  | N/A |  | N/A
| $ | 3,136,291 |  |  |  |  |  |  |  |  |  |  |
(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 December 31, 2023 and December 31, 2022. 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 |
|  | December 31, 2023 |  | December 31, 2022 |
|  | Principal Amount |  | Fair Value |  | Principal Amount |  | Fair Value |
Holdings Credit Facility |  | $ | 515,063 |  |  | $ | 511,511 |  |  | $ | 618,963 |  |  | $ | 604,971 |  |
Unsecured Notes |  | 506,500 |  |  | 490,200 |  |  | 531,500 |  |  | 499,551 |  |
SBA-guaranteed debentures |  | 300,000 |  |  | 259,811 |  |  | 300,000 |  |  | 250,442 |  |
Convertible Notes |  | 260,000 |  |  | 264,706 |  |  | 316,816 |  |  | 317,071 |  |
DB Credit Facility |  | 186,400 |  |  | 184,506 |  |  | 186,400 |  |  | 183,734 |  |
NMFC Credit Facility (1) |  | 36,813 |  |  | 36,507 |  |  | 40,359 |  |  | 39,699 |  |
NMNLC Credit Facility II |  | 2,853 |  |  | 2,846 |  |  | 3,785 |  |  | 3,775 |  |
Total Borrowings |  | $ | 1,807,629 |  |  | $ | 1,750,087 |  |  | $ | 1,997,823 |  |  | $ | 1,899,243 |  |
(1) 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. As of December 31, 2022, the principal amount of the NMFC Credit Facility was $40,359, which included £22,850 denominated in GBP and €700 denominated in EUR that has been converted to U.S. dollars. As of December 31, 2022, the fair value of the NMFC Credit Facility was $39,699, which included £22,476 denominated in GBP and €689 denominated in EUR that has been converted to U.S. dollars.

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