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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2016
Financial Instruments, Owned, at Fair Value [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the estimated fair values of financial instruments:
 
 
March 31, 2016
 
December 31, 2015
 
(Amounts in thousands)
Assets
 
 
 
Investments
$
3,433,315

 
$
3,380,642

Liabilities
 
 
 
Options sold
$
262

 
$
260

Total return swaps
$
9,797

 
$
11,525

Secured notes
$
140,000

 
$
140,000

Unsecured note
$
150,000

 
$
150,000