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Debt - Components of Interest Expense, Related Fees and Cash Paid for Interest Expense for Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 19,162 | $ 17,184 | $ 36,786 | $ 33,809
Amortization of debt issuance cost (loan fees) | 1,533 | 1,537 | 3,075 | 3,046
Unused facility and other fees (loan fees) | 813 | 927 | 1,668 | 1,747
Total interest expense and fees | 21,508 | 19,648 | 41,529 | 38,602
Cash paid for interest expense | 11,452 | 9,824 | 35,536 | 33,664
SBA Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,138 | 1,137 | 2,275 | 2,262
Amortization of debt issuance cost (loan fees) | 146 | 146 | 292 | 290
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 1,284 | 1,283 | 2,567 | 2,552
Cash paid for interest expense | 0 | 0 | 2,275 | 2,262
July 2024 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,252 | 1,252 | 2,504 | 2,504
Amortization of debt issuance cost (loan fees) | 74 | 74 | 148 | 148
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 1,326 | 1,326 | 2,652 | 2,652
Cash paid for interest expense | 0 | 0 | 2,504 | 2,504
February 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 535 | 535 | 1,070 | 1,070
Amortization of debt issuance cost (loan fees) | 28 | 28 | 57 | 57
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 563 | 563 | 1,127 | 1,127
Cash paid for interest expense | 0 | 0 | 1,070 | 1,070
June 2025 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 754 | 755 | 1,508 | 1,509
Amortization of debt issuance cost (loan fees) | 41 | 41 | 81 | 81
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 795 | 796 | 1,589 | 1,590
Cash paid for interest expense | 1,508 | 1,509 | 1,508 | 1,509
June 2025 3-Year Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 750 | 750 | 1,500 | 1,500
Amortization of debt issuance cost (loan fees) | 39 | 39 | 78 | 78
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 789 | 789 | 1,578 | 1,578
Cash paid for interest expense | 1,500 | 1,500 | 1,500 | 1,500
March 2026 A Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 562 | 562 | 1,125 | 1,125
Amortization of debt issuance cost (loan fees) | 23 | 23 | 47 | 47
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 585 | 585 | 1,172 | 1,172
Cash paid for interest expense | 0 | 0 | 1,125 | 1,125
March 2026 B Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 569 | 568 | 1,138 | 1,137
Amortization of debt issuance cost (loan fees) | 26 | 26 | 52 | 52
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 595 | 594 | 1,190 | 1,189
Cash paid for interest expense | 0 | 0 | 1,138 | 1,138
September 2026 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 2,174 | 2,175 | 4,349 | 4,349
Amortization of debt issuance cost (loan fees) | 204 | 204 | 408 | 408
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 2,378 | 2,379 | 4,757 | 4,757
Cash paid for interest expense | 0 | 0 | 4,265 | 4,266
Amortization of original issue discounts | 41 | 42 | 83 | 83
January 2027 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,077 | 3,078 | 6,156 | 6,157
Amortization of debt issuance cost (loan fees) | 207 | 207 | 413 | 414
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 3,284 | 3,285 | 6,569 | 6,571
Cash paid for interest expense | 0 | 0 | 5,906 | 5,906
Amortization of original issue discounts | 125 | 126 | 251 | 251
2031 Asset-Backed Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 1,904 | 1,904 | 3,807 | 3,807
Amortization of debt issuance cost (loan fees) | 100 | 100 | 200 | 200
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 2,004 | 2,004 | 4,007 | 4,007
Cash paid for interest expense | 1,856 | 1,857 | 3,712 | 3,713
Amortization of original issue discounts | 47 | 47 | 94 | 94
2033 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 625 | 625 | 1,250 | 1,250
Amortization of debt issuance cost (loan fees) | 27 | 27 | 54 | 54
Unused facility and other fees (loan fees) | 0 | 0 | 0 | 0
Total interest expense and fees | 652 | 652 | 1,304 | 1,304
Cash paid for interest expense | 625 | 625 | 1,250 | 1,250
MUFG Bank Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 2,143 | 1,363 | 4,076 | 3,076
Amortization of debt issuance cost (loan fees) | 438 | 442 | 885 | 884
Unused facility and other fees (loan fees) | 634 | 691 | 1,243 | 1,308
Total interest expense and fees | 3,215 | 2,496 | 6,204 | 5,268
Cash paid for interest expense | 2,155 | 1,595 | 3,721 | 3,433
SMBC Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | 3,679 | 2,480 | 6,028 | 4,063
Amortization of debt issuance cost (loan fees) | 180 | 180 | 360 | 333
Unused facility and other fees (loan fees) | 179 | 236 | 425 | 439
Total interest expense and fees | 4,038 | 2,896 | 6,813 | 4,835
Cash paid for interest expense | $ 3,808 | $ 2,738 | $ 5,562 | $ 3,988

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-3 + Details
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