Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) $ in Thousands |
Mar. 31, 2023 |
Dec. 31, 2022 |
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Debt Instrument [Line Items] | ||||||||||
Outstanding balance | $ 2,215,000 | $ 2,185,000 | ||||||||
Principal | 1,733,000 | 1,594,000 | ||||||||
Carrying Value | [1] | 1,714,479 | 1,574,351 | |||||||
SBA Debentures | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | [2] | 175,000 | 175,000 | |||||||
Principal | [2] | 175,000 | 175,000 | |||||||
Carrying Value | [1],[2] | 169,881 | 169,738 | |||||||
July 2024 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 105,000 | 105,000 | ||||||||
Principal | 105,000 | 105,000 | ||||||||
Carrying Value | [1] | 104,607 | 104,533 | |||||||
February 2025 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 50,000 | 50,000 | ||||||||
Principal | 50,000 | 50,000 | ||||||||
Carrying Value | [1] | 49,780 | 49,751 | |||||||
June 2025 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 70,000 | 70,000 | ||||||||
Principal | 70,000 | 70,000 | ||||||||
Carrying Value | [1] | 69,636 | 69,595 | |||||||
June 2025 3-Year Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 50,000 | 50,000 | ||||||||
Principal | 50,000 | 50,000 | ||||||||
Carrying Value | [1] | 49,655 | 49,616 | |||||||
March 2026 A Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 50,000 | 50,000 | ||||||||
Principal | 50,000 | 50,000 | ||||||||
Carrying Value | [1] | 49,724 | 49,700 | |||||||
March 2026 B Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 50,000 | 50,000 | ||||||||
Principal | 50,000 | 50,000 | ||||||||
Carrying Value | [1] | 49,699 | 49,673 | |||||||
September 2026 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 325,000 | 325,000 | ||||||||
Principal | 325,000 | 325,000 | ||||||||
Carrying Value | [1] | 321,603 | 321,358 | |||||||
January 2027 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 350,000 | 350,000 | ||||||||
Principal | 350,000 | 350,000 | ||||||||
Carrying Value | [1] | 344,937 | 344,604 | |||||||
2031 Asset-Backed Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 150,000 | 150,000 | ||||||||
Principal | 150,000 | 150,000 | ||||||||
Carrying Value | [1] | 148,104 | 147,957 | |||||||
2033 Notes | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | 40,000 | 40,000 | ||||||||
Principal | 40,000 | 40,000 | ||||||||
Carrying Value | [1] | 38,853 | 38,826 | |||||||
MUFG Bank Facility | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | [2],[3] | 400,000 | 545,000 | |||||||
Principal | [2],[3] | 121,000 | 107,000 | |||||||
Carrying Value | [1],[2],[3] | 121,000 | 107,000 | |||||||
SMBC Facility | ||||||||||
Debt Instrument [Line Items] | ||||||||||
Outstanding balance | [2],[4] | 400,000 | 225,000 | |||||||
Principal | [2],[4] | 197,000 | 72,000 | |||||||
Carrying Value | [1],[2],[4] | $ 197,000 | $ 72,000 | |||||||
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