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Investments
12 Months Ended
Dec. 31, 2012
Investments [Abstract]  
Investments
4.    Investments

The Company has no available-for-sale securities at December 31, 2012.  In 2011, the Company invested in U.S. Treasury Securities that were short in duration. The following is a summary of the Company's available-for-sale securities at December 31, 2011:

 
 
At December 31, 2011
 
(in thousands)
 
Amortized Costs
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Estimated Fair Market Value
 
U.S. Treasury securities
 
$
1,966
  
$
-
  
$
-
  
$
1,966
 

The estimated fair value and amortized cost of investments available-for-sale by contractual maturity are due in one year or less. Unrealized gains and losses on cash equivalents and available-for-sale securities are included in accumulated other comprehensive income in the accompanying consolidated balance sheets. As of December 31, 2012 and 2011, the unrealized losses on investments were immaterial.