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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2013
Investments, All Other Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The following table details the unrealized gains and losses on investment securities as of March 31, 2013 and December 31, 2012 (amounts in thousands):
 
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Equity securities as of March 31, 2013
 
$
4

 
$
—

 
$
—

 
$
4

Preferred securities as of December 31, 2012
 
$
41,747

 
$
223

 
$
(316
)
 
$
41,654