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INVESTMENTS - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 1,520,038	$ 1,231,898
New investments	848,735	765,524
Investments acquired in Sierra merger	271,490
Transfers into (out of) Level 3, net	39,239	5,458
Proceeds from sales of investments	(345,035)	(410,951)
Loan origination fees received	(15,963)	(13,694)
Principal repayments received	(263,826)	(198,264)
Fair value, end of period	2,019,381	1,397,568
Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	11,520	8,406
Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	8,335	6,405
Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	311	221
Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(15,601)	2,313
Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(39,862)	252
Senior debt and 1st lien notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	1,137,323	1,055,717
New investments	689,638	585,196
Investments acquired in Sierra merger	210,176
Transfers into (out of) Level 3, net	18,015	0
Proceeds from sales of investments	(321,758)	(394,827)
Loan origination fees received	(14,660)	(12,485)
Principal repayments received	(207,026)	(170,947)
Fair value, end of period	1,462,413	1,069,751
Senior debt and 1st lien notes | Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	1,994	685
Senior debt and 1st lien notes | Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	6,574	6,029
Senior debt and 1st lien notes | Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	222	10
Senior debt and 1st lien notes | Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(12,292)	1,837
Senior debt and 1st lien notes | Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(45,793)	(1,464)
Subordinated debt and 2nd lien notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	230,569	130,820
New investments	89,749	83,856
Investments acquired in Sierra merger	54,177
Transfers into (out of) Level 3, net	9,056	2,234
Proceeds from sales of investments	(21,555)	(8,771)
Loan origination fees received	(1,303)	(1,209)
Principal repayments received	(56,443)	(27,317)
Fair value, end of period	269,995	185,247
Subordinated debt and 2nd lien notes | Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	9,320	7,721
Subordinated debt and 2nd lien notes | Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	1,761	376
Subordinated debt and 2nd lien notes | Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	89	211
Subordinated debt and 2nd lien notes | Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(2,567)	(28)
Subordinated debt and 2nd lien notes | Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(42,858)	(2,646)
Structured products
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	0
New investments	6,000
Investments acquired in Sierra merger	0
Transfers into (out of) Level 3, net	4,905
Proceeds from sales of investments	0
Loan origination fees received	0
Principal repayments received	(357)
Fair value, end of period	9,482
Structured products | Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0
Structured products | Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0
Structured products | Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0
Structured products | Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0
Structured products | Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(1,066)
Equity shares
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	151,282	44,227
New investments	63,344	96,309
Investments acquired in Sierra merger	7,065
Transfers into (out of) Level 3, net	7,263	3,224
Proceeds from sales of investments	(1,472)	(6,903)
Loan origination fees received	0	0
Principal repayments received	0	0
Fair value, end of period	277,488	141,946
Equity shares | Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	206	0
Equity shares | Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0	0
Equity shares | Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0	0
Equity shares | Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	18	341
Equity shares | Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	49,782	4,748
Equity warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	864	1,134
New investments	4	163
Investments acquired in Sierra merger	72
Transfers into (out of) Level 3, net	0	0
Proceeds from sales of investments	(250)	(450)
Loan origination fees received	0	0
Principal repayments received	0	0
Fair value, end of period	3	624
Equity warrants | Paid In Kind Interest/Dividends
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0	0
Equity warrants | Accretion Of Deferred Loan Origination Revenue
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0	0
Equity warrants | Accretion Of Loan Premium/Discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	0	0
Equity warrants | Gain (Loss) on Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	(760)	163
Equity warrants | Unrealized Appreciation (Depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Realized gain (loss)	$ 73	$ (386)

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Acquired In Asset Acquisition

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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