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Depreciation and Amortization
 3 Months Ended
Mar. 31, 2015
Text Block [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, 2015 and 2014 was as follows (in thousands):

 

     Three Months Ended
March 31,		  
     2015      2014  

Operating expenses

    $ 4,891       $ 4,584   

Corporate general and administrative expenses

      96         116   
  

 

 

     

 

 

  

Total depreciation and amortization expense

 $ 4,987    $ 4,700