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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2013 and December 31, 2012.
 
 
September 30, 2013
 
December 31, 2012
 
(Amounts in thousands)
Assets
 
 
 
Investments
$
3,126,330

 
$
3,180,095

Total return swap
$
346

 
$
0

Liabilities
 
 
 
Interest rate swap
$
0

 
$
103

Equity contracts
$
0

 
$
175

Secured notes
$
140,000

 
$
140,000

Unsecured note
$
40,000

 
$
0