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Depreciation and Amortization
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2015 and 2014 was as follows (in thousands):

 

     Three Months Ended
September 30,		      Nine Months Ended
September 30,		  
     2015      2014      2015      2014  

Operating expenses

    $ 5,000       $ 4,941       $ 14,847       $ 14,226   

Corporate general and administrative expenses

      117         101         321         334   
  

 

 

     

 

 

     

 

 

     

 

 

  

Total depreciation and amortization expense

    $ 5,117       $ 5,042       $ 15,168       $ 14,560