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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
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,
 
2015
 
2014
 
(Amounts in thousands)
Assets
 
 
 
Investments
$
3,380,642

 
$
3,403,822

Liabilities
 
 
 
Total return swaps
$
11,525

 
$
4,025

Options sold
$
260

 
$
194

Secured notes
$
140,000

 
$
140,000

Unsecured note
$
150,000

 
$
150,000