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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt Instrument [Line Items] |  |
Interest expense | $ 17,624 | $ 16,625
Amortization of debt issuance cost (loan fees) | 1,542 | 1,509
Unused facility and other fees (loan fees) | 855 | 820
Total interest expense and fees | 20,021 | 18,954
Cash paid for interest expense | 24,084 | 23,840
SBA Debentures |  |
Debt Instrument [Line Items] |  |
Interest expense | 1,137 | 1,125
Amortization of debt issuance cost (loan fees) | 146 | 144
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 1,283 | 1,269
Cash paid for interest expense | 2,275 | 2,262
July 2024 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 1,252 | 1,252
Amortization of debt issuance cost (loan fees) | 74 | 74
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 1,326 | 1,326
Cash paid for interest expense | 2,504 | 2,504
February 2025 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 535 | 535
Amortization of debt issuance cost (loan fees) | 29 | 29
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 564 | 564
Cash paid for interest expense | 1,070 | 1,070
June 2025 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 754 | 754
Amortization of debt issuance cost (loan fees) | 40 | 40
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 794 | 794
Cash paid for interest expense | 0 | 0
June 2025 3-Year Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 750 | 750
Amortization of debt issuance cost (loan fees) | 39 | 39
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 789 | 789
Cash paid for interest expense | 0 | 0
March 2026 A Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 563 | 563
Amortization of debt issuance cost (loan fees) | 24 | 24
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 587 | 587
Cash paid for interest expense | 1,125 | 1,125
March 2026 B Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 569 | 569
Amortization of debt issuance cost (loan fees) | 26 | 26
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 595 | 595
Cash paid for interest expense | 1,138 | 1,139
September 2026 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 2,175 | 2,174
Amortization of debt issuance cost (loan fees) | 203 | 204
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 2,378 | 2,378
Cash paid for interest expense | 4,265 | 4,266
Amortization of original issue discounts | 42 | 42
January 2027 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 3,079 | 3,079
Amortization of debt issuance cost (loan fees) | 207 | 207
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 3,286 | 3,286
Cash paid for interest expense | 5,906 | 5,906
Amortization of original issue discounts | 126 | 126
2031 Asset-Backed Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 1,903 | 1,903
Amortization of debt issuance cost (loan fees) | 100 | 100
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 2,003 | 2,003
Cash paid for interest expense | 1,856 | 1,856
Amortization of original issue discounts | 47 | 47
2033 Notes |  |
Debt Instrument [Line Items] |  |
Interest expense | 625 | 625
Amortization of debt issuance cost (loan fees) | 27 | 27
Unused facility and other fees (loan fees) | 0 | 0
Total interest expense and fees | 652 | 652
Cash paid for interest expense | 625 | 625
MUFG Bank Facility |  |
Debt Instrument [Line Items] |  |
Interest expense | 1,933 | 1,713
Amortization of debt issuance cost (loan fees) | 447 | 442
Unused facility and other fees (loan fees) | 609 | 617
Total interest expense and fees | 2,989 | 2,772
Cash paid for interest expense | 1,566 | 1,837
SMBC Facility |  |
Debt Instrument [Line Items] |  |
Interest expense | 2,349 | 1,583
Amortization of debt issuance cost (loan fees) | 180 | 153
Unused facility and other fees (loan fees) | 246 | 203
Total interest expense and fees | 2,775 | 1,939
Cash paid for interest expense | $ 1,754 | $ 1,250

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