Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details)

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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value $ 3,895,764 $ 4,214,739
Unamortized issuance costs 23,251 11,833
Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 3,826,106 4,206,900
Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 3,895,764 4,214,739
HLEND A Funding Facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 603,407 615,838
HLEND A Funding Facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 603,407 615,838
HLEND B Funding Facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 316,767 513,747
HLEND B Funding Facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 316,767 513,747
HLEND C Funding Facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 487,500 487,500
HLEND C Funding Facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 487,500 487,500
HLEND D Funding Facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 125,000 195,000
HLEND D Funding Facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 125,000 195,000
HLEND E Funding Facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 0 0
HLEND E Funding Facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 0 0
Senior secured revolving credit facility | Line of credit | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 403,964 1,025,294
Senior secured revolving credit facility | Line of credit | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 403,964 1,025,294
November 2025 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 1,000 1,200
Net cumulative increase (decrease) from hedging activities (1,000) (0)
November 2025 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 167,908 168,749
November 2025 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 173,401 170,580
November 2027 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 1,300 1,400
Net cumulative increase (decrease) from hedging activities (900) 700
November 2027 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 152,776 154,366
November 2027 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 161,773 155,934
March 2026 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 1,600 1,800
Net cumulative increase (decrease) from hedging activities (1,700) 600
March 2026 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 272,703 274,716
March 2026 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 281,339 275,727
March 2028 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 900 900
Net cumulative increase (decrease) from hedging activities (1,300) 500
March 2028 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 121,825 123,588
March 2028 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 128,750 123,672
September 2027 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 700 700
Net cumulative increase (decrease) from hedging activities 100 1,300
September 2027 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 74,467 75,545
September 2027 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 78,690 76,389
September 2028 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 2,300 2,500
Net cumulative increase (decrease) from hedging activities 900 5,300
September 2028 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 248,524 252,814
September 2028 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 266,578 255,315
January 2029 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 12,200  
Net cumulative increase (decrease) from hedging activities (6,400)  
January 2029 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 531,455 0
January 2029 notes | Senior notes | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 548,785 0
CLO Secured notes 2023 | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 319,810 319,743
CLO Secured notes 2023 | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 319,810 319,743
CLO Secured notes 2023 | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs $ 3,200 $ 3,300