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Borrowings - Schedule of Information about Senior Securities (Parenthetical) (Details) - USD ($) | 2 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2021 | Apr. 30, 2021 | Oct. 28, 2020 | Dec. 18, 2019 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage per unit measure per dollar |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.85% |
Aggregate principal amount |  |  | $ 92,000,000 | $ 49,321,000 | $ 79,571,000 |  |  |  |  |  |  | $ 80,571,000 |  |  |  |
7.375% Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 7.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Average market value per par value | $ 1,012,280 |  |  |  |  |  | $ 1,016,040.00 | $ 1,000,000.00 | $ 1,011,960 | $ 1,037,720 | $ 1,032,960 |  |  |  |  |
6.125% Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 6.125% |  |  |  |  |  |  |  |  |  | 6.125% |  |  |
Average market value per par value |  | $ 1,006,000.00 |  | 953,200 | 1,009,930 | $ 1,009,200 |  |  |  |  |  |  |  |  |  |
6.125% Notes Due 2022 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.125%
Aggregate principal amount |  |  |  | 76,726,000 | $ 77,407,000 |  |  |  |  |  |  |  |  |  |  | $ 77,400,000
4.875% Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 4.875% |  |  |  |  |  |  |  |  |  |  |  |  |
4.875% Notes Due 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  |  |
Aggregate principal amount |  |  | $ 108,000,000 |  |  |  |  |  |  |  |  | 108,000,000 |  |  |  |
2018-2 Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 178,163,000 | $ 251,863,000 |  |  |  |  |  |  |  | $ 163,863,000 |  | $ 312,000,000.0 |  |

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