Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Cost	$ 1,359,869	$ 1,352,116
Foreign currencies, cost	$ 10,107	$ 8,229
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	29,672,058	29,270,679
Common stock, shares outstanding (in shares)	29,672,058	29,270,679
Non-Control / Non-Affiliate investments
Cost	$ 1,175,926	$ 1,170,790
Affiliate investments
Cost	$ 183,943	$ 181,326