Investments - Schudule of Unobservable Inputs Used In The Fair Value Measurement Of Our Level 3 Investments (Details) - Level 3 $ in Thousands		Sep. 30, 2023 USD ($)		Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 3,859,038		$ 2,830,231
First Lien Secured Debt | Cost Approach | Cost Approach
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		536,941
First Lien Secured Debt | Discounted Cash Flow | Discount Rate
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 3,290,866		$ 2,279,041
First Lien Secured Debt | Discounted Cash Flow | Discount Rate | Minimum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		0.083		0.087
First Lien Secured Debt | Discounted Cash Flow | Discount Rate | Maximum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		0.139		0.145
First Lien Secured Debt | Discounted Cash Flow | Discount Rate | Weighted Average
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		0.111	[1]	0.107	[2]
First Lien Secured Debt | Transactional Value | Cost Approach
Schedule of Investments [Line Items]
Assets Fair Value Disclosure				$ 550,929
Second Lien Secured Debt | Discounted Cash Flow | Discount Rate
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 30,716
Second Lien Secured Debt | Discounted Cash Flow | Discount Rate | Minimum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		0.191
Second Lien Secured Debt | Discounted Cash Flow | Discount Rate | Maximum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		0.191
Second Lien Secured Debt | Discounted Cash Flow | Discount Rate | Weighted Average
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input	[1]	0.191
Common Equity/Interests | Cost Approach | Cost Approach
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 190
Common Equity/Interests | Market Comparable Technique | Comparable Multiple
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 290
Common Equity/Interests | Market Comparable Technique | Comparable Multiple | Minimum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		7.8
Common Equity/Interests | Market Comparable Technique | Comparable Multiple | Maximum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		21
Common Equity/Interests | Market Comparable Technique | Comparable Multiple | Weighted Average
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input	[1]	14.2
Common Equity/Interests | Recent Transaction | Recent Transaction
Schedule of Investments [Line Items]
Assets Fair Value Disclosure				205
Preferred Equity | Market Comparable Technique | Comparable Multiple
Schedule of Investments [Line Items]
Assets Fair Value Disclosure		$ 35
Preferred Equity | Market Comparable Technique | Comparable Multiple | Minimum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		13.3
Preferred Equity | Market Comparable Technique | Comparable Multiple | Maximum
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input		13.3
Preferred Equity | Market Comparable Technique | Comparable Multiple | Weighted Average
Schedule of Investments [Line Items]
Quantitative Information on Unobservable input	[1]	13.3
Preferred Equity | Recent Transaction | Recent Transaction
Schedule of Investments [Line Items]
Assets Fair Value Disclosure				$ 56

[1] The weighted average information is generally derived by assigning each disclosed unobservable input a proportionate weight based on the fair value of the related investment. For the commodity price unobservable input, the weighted average price is an undiscounted price based upon the estimated production level from the underlying reserves.

[2] The weighted average information is generally derived by assigning each disclosed unobservable input a proportionate weight based on the fair value of the related investment. For the commodity price unobservable input, the weighted average price is an undiscounted price based upon the estimated production level from the underlying reserves.