Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Financial Instruments, Owned, at Fair Value [Abstract]

Estimated Fair Values of Financial Instruments

The following table presents the fair values of financial instruments:

	September 30, 2020		December 31, 2019
	(Amounts in thousands)
Assets
Investments	$	4,548,796	$	4,312,161
Note receivable	5,736		5,665
Liabilities
Options sold	1,356		77
Unsecured notes	406,144		394,279