Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

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, 2018		December 31, 2017
	(Amounts in thousands)
Assets
Investments	$	3,904,064	$	3,732,728
Note receivable	5,514		5,565
Liabilities
Total return swap	$	961	$	1,200
Options sold	589		123
Unsecured notes	361,118		385,583