Financial Instruments (Tables)

6 Months Ended

Jun. 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:

	June 30, 2018		December 31, 2017
	(Amounts in thousands)
Assets
Investments	$	3,834,156	$	3,732,728
Note receivable	5,516		5,565
Liabilities
Total return swap	$	1,393	$	1,200
Options sold	780		123
Unsecured notes	364,736		385,583