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Depreciation and Amortization
3 Months Ended
Mar. 31, 2012
Depreciation and Amortization [Abstract]  
Depreciation and Amortization
4. Depreciation and Amortization

Depreciation and amortization expense for property and equipment and intangible assets for the three months ended March 31, 2012 and 2011 was as follows (in thousands):

 

                 
     Three Months Ended
March  31,
 
    2012     2011  

Operating expenses

  $ 5,147     $ 4,938  

Corporate general and administrative expenses

    81       92  
   

 

 

   

 

 

 

Total depreciation and amortization expense

  $ 5,228     $ 5,030