Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment cost	$ 1,106,849	$ 1,150,602
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Non-Control/Non-Affiliate Investments
Investment cost	$ 1,005,024	$ 1,126,879
Affiliate Investments
Investment cost	58,861	4,551
Control Investments
Investment cost	950	19,172
U.S. Treasury Bills
Investment cost	$ 42,014	$ 0