Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Financial Instruments, Owned, at Fair Value [Abstract]

Estimated Fair Values of Financial Instruments

The following table presents the fair values of financial instruments:

	December 31,
	2018		2017
	(Amounts in thousands)
Assets
Investments	$	3,768,091	$	3,732,728
Note receivable	5,557		5,565
Liabilities
Total return swaps	4,851		1,200
Options sold	3		123
Unsecured notes	362,674		385,583