Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Financial Instruments, Owned, at Fair Value [Abstract]

Estimated Fair Values of Financial Instruments

The following table presents the fair values of financial instruments:

	March 31, 2021		December 31, 2020
	(Amounts in thousands)
Assets
Investments	$	4,946,202	$	4,729,270
Note receivable	5,712		5,725
Liabilities
Options sold	81		—
Unsecured notes	422,936		415,253