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Commitments and Contingencies - Schedule of Contractual Obligations (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
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Commitments And Contingencies [Line Items] |  |  |  |  |  |
Long-Term Debt, Total | [1] | $ 1,714,479 |  | $ 1,574,351 |  |
Lessee, Operating Lease, Liability, to be Paid, Year One |  | 1,191 |  |  |  |
Total lease payments |  | 7,890 |  |  |  |
Contractual Obligation, to be Paid, Year One | [2] |  |  | 2,723 |  | $ 2,142
Contractual Obligation, to be Paid, Year Two and Three | [2] | 377,259 |  | 384,259 |  |
Contractual Obligation, to be Paid, Year Four and Five | [2] | 995,454 |  | 849,452 |  |
Contractual Obligation Due After Fifth Year | [2] | 366,167 |  | 366,207 |  |
Contractual Obligations, Total | [2] | 1,741,022 |  | 1,602,641 |  |
Debt Investments [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Long-Term Debt, Maturity, Year One | [2],[3] | 0 | [4] | 0 | [5] |
Long-Term Debt, Maturity, Year Two and Three | [2],[3] | 375,000 | [4] | 382,000 | [5] |
Long-Term Debt, Maturity, Year Four and Five | [2],[3] | 993,000 | [4] | 847,000 | [5] |
Long-Term Debt, Maturity, after Year Five | [2],[3] | 365,000 | [4] | 365,000 | [5] |
Long-Term Debt, Total | [3] | 1,733,000 | [4] | 1,594,000 | [5] |
Lease and License Obligations |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Liability, to be Paid, Year One | [2],[6] | 2,142 |  | 2,723 |  |
Lessee, Operating Lease, Liability, to be Paid, Year Two and Three | [2],[6] | 2,259 |  | 2,259 |  |
Lessee, Operating Lease, Liability, to be Paid, Year Four and Five | [2],[6] | 2,454 |  | 2,452 |  |
Lessee, Operating Lease, Liability, to be Paid, after Year Five | [2],[6] | 1,167 |  | 1,207 |  |
Total lease payments | [2],[6] | $ 8,022 |  | $ 8,641 |  |
[1] | Except for the SMBC Facility and MUFG Bank Facility (f.k.a. Union Bank Facility), all carrying values represent the principal amount outstanding less the remaining unamortized debt issuance costs and unaccreted premium or discount, if any, associated with the debt as of the balance sheet date.
[2] | Excludes commitments to extend credit to the Company’s portfolio companies and uncalled capital commitments in investment funds.
[3] | Amounts represent future principal repayments and not the carrying value of each liability. See “Note 5 – Debt”.
[4] | Includes $175.0 million in principal outstanding under the SBA Debentures, $105.0 million of the July 2024 Notes, $50.0 million of the February 2025 Notes, $70.0 million of the June 2025 Notes, $50.0 million of the June 2025 3-Year Notes, $50.0 million of the March 2026 A Notes, $50.0 million of the March 2026 B Notes, $150.0 million of the 2031 Asset-Backed Notes, $40.0 million of the 2033 Notes, $325.0 million of the September 2026 Notes and $350.0 million of the January 2027 Notes as of March 31, 2023. There was also $197.0 million outstanding under the SMBC Facility and $121.0 million outstanding under the MUFG Bank Facility as of March 31, 2023.
[5] | Includes $175.0 million in principal outstanding under the SBA Debentures, $105.0 million of the July 2024 Notes, $50.0 million of the February 2025 Notes, $70.0 million of the June 2025 Notes, $50.0 million of the June 2025 3-Year Notes, $50.0 million of the March 2026 A Notes, $50.0 million of the March 2026 B Notes, $150.0 million of the 2031 Asset-Backed Notes, $40.0 million of the 2033 Notes, $325.0 million of the September 2026 Notes and $350.0 million of the January 2027 Notes as of December 31, 2022. There was also $72.0 million outstanding under the SMBC Facility and $107.0 million outstanding under the MUFG Bank Facility as of December 31, 2022.
[6] | Facility leases and licenses including short-term leases.

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