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Investments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes the Company’s available-for-sale securities on hand as of June 30, 2013 and December 31, 2012 (in thousands): 
 
Investments in marketable securities
 
Adjusted
 Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Marketable securities at June 30, 2013
$
17,608

 
$
(1,799
)
 
$
199

 
$
16,008

 
 
 
 
 
 
 
 
Marketable securities at December 31, 2012
$
34,786

 
$
(10,443
)
 
$
2,722

 
$
27,065
Available-for-sale securities, continuous unrealized loss position, fair value