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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2014
Financial Instruments, Owned, at Fair Value [Abstract]  
Estimated Fair Values of Financial Instruments
The following table presents the estimated fair values of financial instruments at September 30, 2014 and December 31, 2013.
 
 
September 30, 2014
 
December 31, 2013
 
(Amounts in thousands)
Assets
 
 
 
Investments
$
3,407,703

 
$
3,158,312

Total return swaps
$
—

 
$
1,650

Liabilities
 
 
 
Equity contracts
$
348

 
$
140

Total return swaps
$
1,287

 
$
—

Secured notes
$
140,000

 
$
140,000

Unsecured note
$
150,000

 
$
50,000