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Investments
12 Months Ended
Dec. 31, 2011
Investments [Abstract]  
Investments
8. Investments
Investments consisted of the following:
                 
    As of December 31,  
(in thousands)   2011     2010  
 
Investments held at cost
  $ 15,299     $ 10,366  
Equity method investments
    7,915       286  
 
           
Total investments
  $ 23,214     $ 10,652  
 
           
Our investments do not trade in public markets, so they do not have readily determinable fair values. We estimate the fair values of the investments to approximate their carrying values at December 31, 2011 and 2010. There can be no assurance we would realize the carrying values of these securities upon their sale.