Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Financial Instruments, Owned, at Fair Value [Abstract]

Estimated Fair Values of Financial Instruments

The following table presents estimated fair values of financial instruments:

	December 31,
	2016		2015
	(Amounts in thousands)
Assets
Investments	$	3,547,560	$	3,380,642
Total return swaps	667		—
Liabilities
Total return swaps	$	765	$	11,525
Options sold	20		260
Secured notes	140,000		140,000
Unsecured note	180,000		150,000