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
Jun. 30, 2024
Dec. 31, 2023
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value $ 4,310,467 $ 4,214,739
Unamortized issuance costs 57,128 11,833
Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 4,220,909 4,206,900
Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 4,310,467 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 604,851 615,838
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 604,851 615,838
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 134,828 513,747
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 134,828 513,747
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 220,760 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 220,760 1,025,294
November 2025 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 900 1,200
Net cumulative increase (decrease) from hedging activities (900) 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 168,261 168,749
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 173,528 170,580
November 2027 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 1,200 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 152,910 154,366
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 162,702 155,934
March 2026 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 1,400 1,800
Net cumulative increase (decrease) from hedging activities (2,900) 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 271,712 274,716
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 281,970 275,727
March 2028 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 800 900
Net cumulative increase (decrease) from hedging activities (2,100) 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 121,014 123,588
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 129,661 123,672
September 2027 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 600 700
Net cumulative increase (decrease) from hedging activities (300) 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 74,032 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 79,080 76,389
September 2028 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 2,200 2,500
Net cumulative increase (decrease) from hedging activities (1,000) 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 246,832 252,814
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 268,461 255,315
January 2029 notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 11,600  
Net cumulative increase (decrease) from hedging activities (10,800)  
January 2029 notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 527,665 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 553,559 0
September 2029 Notes | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 8,800  
Net cumulative increase (decrease) from hedging activities 900  
September 2029 Notes | Senior notes | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 392,105 0
September 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 395,128 0
CLO Secured notes 2023 | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 319,879 319,743
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 319,879 319,743
CLO Secured notes 2023 | Senior notes    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Unamortized issuance costs 3,100 3,300
CLO Secured Notes 2024 | Reported Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value 373,560 0
CLO Secured Notes 2024 | Estimate of Fair Value Measurement    
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]    
Debt fair value $ 373,560 $ 0