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Fair Value Measures and Disclosures - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 1,716,054 | $ 1,632,922
Investments purchased | 76,685 | 143,540
Accretion of discount | 4,342 | 2,496
Sales and principal repayments | (112,260) | (61,032)
Ending balance | 1,629,058 | 1,706,556
Change in net unrealized (depreciation) appreciation on investments still held | (50,516) | (11,105)
Total | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (4,525) | (69)
Total | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (51,238) | (11,301)
Senior Secured First Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,579,512 | 1,526,989
Investments purchased | 40,752 | 141,792
Accretion of discount | 4,269 | 2,404
Sales and principal repayments | (112,175) | (60,842)
Ending balance | 1,472,453 | 1,597,364
Change in net unrealized (depreciation) appreciation on investments still held | (34,672) | (12,710)
Senior Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (4,511) | (73)
Senior Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (35,394) | (12,906)
Senior Secured Second Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 38,769 | 38,583
Investments purchased | 0 | 0
Accretion of discount | 69 | 88
Sales and principal repayments | (4) | 0
Ending balance | 38,997 | 36,875
Change in net unrealized (depreciation) appreciation on investments still held | 163 | (1,800)
Senior Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 0 | 4
Senior Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 163 | (1,800)
Collateralized securities and structured products - equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,179 | 2,998
Investments purchased | 0 | 0
Accretion of discount | 0 | 0
Sales and principal repayments | (81) | (190)
Ending balance | 1,133 | 2,632
Change in net unrealized (depreciation) appreciation on investments still held | 35 | (176)
Collateralized securities and structured products - equity | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 0 | 0
Collateralized securities and structured products - equity | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 35 | (176)
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 22,643 | 26,616
Investments purchased | 0 | 623
Accretion of discount | 4 | 4
Sales and principal repayments | 0 | 0
Ending balance | 15,517 | 27,280
Change in net unrealized (depreciation) appreciation on investments still held | (7,130) | 37
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 0 | 0
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (7,130) | 37
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 73,951 | 37,736
Investments purchased | 35,933 | 1,125
Accretion of discount | 0 | 0
Sales and principal repayments | 0 | 0
Ending balance | 100,958 | 42,405
Change in net unrealized (depreciation) appreciation on investments still held | (8,912) | 3,544
Equity | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (14) | 0
Equity | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | $ (8,912) | $ 3,544

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