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Investments (Tables)
 6 Months Ended
Jun. 30, 2012
Investment in Marketable Securities [Abstract]  
Investments
The following table summarizes the Company’s available-for-sale securities on hand as of June 30, 2012 and December 31, 2011 (in thousands): 
 
Investments in marketable securities
 
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Marketable securities at June 30, 2012
$
31,377

 
$
(11,544
)
 
$
1,317

 
$
21,150

 
 
 
 
 
 
 
 
Marketable securities at December 31, 2011
$
24,819

 
$
(4,975
)
 
$
—

 
$
19,844