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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Of Outstanding Borrowings (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | $ 1,588,608 | $ 1,574,351
Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 1,588,608 | 1,574,351
Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 1,449,051 | 1,434,445
SBA Debentures | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 170,028 | 169,738
SBA Debentures | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 146,395 | 155,257
July 2024 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 104,680 | 104,533
July 2024 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 103,447 | 102,019
February 2025 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 49,809 | 49,751
February 2025 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 47,754 | 47,044
June 2025 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 69,676 | 69,595
June 2025 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 65,121 | 64,198
March 2026 A Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 49,747 | 49,700
March 2026 A Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 46,038 | 45,512
March 2026 B Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 49,725 | 49,673
March 2026 B Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 46,105 | 45,588
June 2025 3-Year Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 49,694 | 49,616
June 2025 3-Year Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 47,831 | 47,528
January 2027 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 345,269 | 344,604
January 2027 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 301,265 | 296,826
September 2026 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 321,849 | 321,358
September 2026 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 274,835 | 269,509
2031 Asset-Backed Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 148,251 | 147,957
2031 Asset-Backed Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 139,740 | 142,620
2033 Notes | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 38,880 | 38,826
2033 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 39,520 | 39,344
MUFG Bank Facility | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt | [1] | 61,000 | 107,000
MUFG Bank Facility | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value | [1] | 61,000 | 107,000
SMBC Facility | Carrying Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Other Long-Term Debt |  | 130,000 | 72,000
SMBC Facility | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 130,000 | 72,000
Observable Inputs Level 2 | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 179,260 | 181,964
Observable Inputs Level 2 | 2031 Asset-Backed Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 139,740 | 142,620
Observable Inputs Level 2 | 2033 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 39,520 | 39,344
Unobservable Inputs Level 3 | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 1,269,791 | 1,252,481
Unobservable Inputs Level 3 | SBA Debentures | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 146,395 | 155,257
Unobservable Inputs Level 3 | July 2024 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 103,447 | 102,019
Unobservable Inputs Level 3 | February 2025 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 47,754 | 47,044
Unobservable Inputs Level 3 | June 2025 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 65,121 | 64,198
Unobservable Inputs Level 3 | March 2026 A Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 46,038 | 45,512
Unobservable Inputs Level 3 | March 2026 B Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 46,105 | 45,588
Unobservable Inputs Level 3 | June 2025 3-Year Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 47,831 | 47,528
Unobservable Inputs Level 3 | January 2027 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 301,265 | 296,826
Unobservable Inputs Level 3 | September 2026 Notes | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | 274,835 | 269,509
Unobservable Inputs Level 3 | MUFG Bank Facility | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value | [1] | 61,000 | 107,000
Unobservable Inputs Level 3 | SMBC Facility | Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Approximate fair value |  | $ 130,000 | $ 72,000
[1] | June 2022 the MUFG Bank Facility replaced the Union Bank Facility via an amendment which changed the lead lender.

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