Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022
Amortized Cost	$ 12,632,202	[1],[2],[3],[4],[5],[6]	$ 13,046,132	[7],[8],[9],[10],[11]
Restricted cash	87,067		96,420
Foreign cash, cost	946		809
Unamortized debt issuance costs	$ 81,492		$ 95,647
Common stock, par value (in usd per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	500,000,000		500,000,000
Common stock, shares, issued (in shares)	389,732,868		392,476,687
Common stock, shares outstanding (in shares)	389,732,868		392,476,687
Investment income from non-controlled, non-affiliated investments:
Amortized Cost	$ 11,271,962		$ 12,133,062
Non-controlled, affiliated investments
Amortized Cost	19,004		6,224
Investment income from controlled, affiliated investments:
Amortized Cost	$ 1,341,236		$ 906,846

[1] Unless otherwise indicated, loan contains a variable rate structure and may be subject to an interest rate floor. Variable rate loans bear interest at a rate that may be determined by reference to either the Secured Overnight Financing Rate ("SOFR" or "S," which can include one-, three- or six- month SOFR), Euro Interbank Offered Rate (“EURIBOR”), Great Britain Pound London Interbank Offered Rate (“GBPLIBOR” or “G”, which can include three- or six-month GBPLIBOR), SONIA ("SONIA” or "SA") or an alternate base rate (which can include the Federal Funds Effective Rate or the Prime Rate), at the borrower’s option, and which reset periodically based on the terms of the loan agreement.

[2] As of December 31, 2023, the net estimated unrealized loss for U.S. federal income tax purposes was $0.4 million based on a tax cost basis of $12.7 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $325.3 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $324.9 million.

[3] The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.

[4] Unless otherwise indicated, all investments are considered Level 3 investments.

[5] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facility and CLOs. See Note 6 “Debt”.

[6] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 26 for additional information on our restricted securities.

[7] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 28 for additional information on our restricted securities.

[8] As of December 31, 2022, the net estimated unrealized loss for U.S. federal income tax purposes was $126.2 million based on a tax cost basis of $13.1 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $382.2 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $256.0 million.

[9] The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount , as applicable, on debt investments using the effective interest method.

[10] Unless otherwise indicated, all investments are considered Level 3 investments.

[11] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See Note 6 “Debt”.