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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):

 

     As of December 31,  
     2017      2016  

Land

    $ 66      $ 66  

Buildings

      218        218  

Leasehold improvements

      6,152        5,235  

Furniture, fixtures and equipment

      30,863        26,344  

Vehicles and equipment

      153,744        124,861  
  

 

 

     

 

 

  
     191,043        156,724  

Less: accumulated depreciation and amortization

      (109,968 )       (88,936 ) 
  

 

 

     

 

 

  
   $ 81,075      $ 67,788  
  

 

 

     

 

 

  
Schedule of Depreciation and Amortization Expense on Property and Equipment, by Income Statement Category

During the twelve months ended December 31, 2017 and 2016 we recorded the following depreciation and amortization expense on our property and equipment, by income statement category (in thousands):

 

     As of December 31,  
     2017      2016      2015  

Cost of sales

    $ 26,731      $ 22,294      $ 16,101  

Administrative

      1,554        1,276        874