Quarterly report pursuant to Section 13 or 15(d)

DEBT - Summary of Debt (Details)

v3.23.1
DEBT - Summary of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Outstanding Balance $ 1,998,000 $ 2,007,000
Unamortized Debt Issuance (Costs)/ Premiums (8,359) (7,898)
Recorded Value 1,989,641 1,999,102
Estimated Fair Value 1,857,852 1,882,810
July 2026 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 500,000 500,000
Unamortized Debt Issuance (Costs)/ Premiums (1,733) (1,864)
Recorded Value 498,267 498,136
Estimated Fair Value 438,945 434,250
May 2024 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 450,000 450,000
Unamortized Debt Issuance (Costs)/ Premiums 590 727
Recorded Value 450,590 450,727
Estimated Fair Value 439,754 444,749
SBIC Debentures | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 334,000 350,000
Unamortized Debt Issuance (Costs)/ Premiums (5,794) (6,086)
Recorded Value 328,206 343,914
Estimated Fair Value 261,555 290,204
December 2025 Notes | Unsecured Notes    
Debt Instrument [Line Items]    
Outstanding Balance 150,000 100,000
Unamortized Debt Issuance (Costs)/ Premiums (1,422) (675)
Recorded Value 148,578 99,325
Estimated Fair Value 153,598 106,607
Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Recorded Value 564,000 607,000
Credit Facility | Corporate Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 394,000 407,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 394,000 407,000
Estimated Fair Value 394,000 407,000
Credit Facility | SPV Facility | Line of Credit    
Debt Instrument [Line Items]    
Outstanding Balance 170,000 200,000
Unamortized Debt Issuance (Costs)/ Premiums 0 0
Recorded Value 170,000 200,000
Estimated Fair Value $ 170,000 $ 200,000