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Intangible Assets
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
8. INTANGIBLE ASSETS

Intangible assets consist of the following (in thousands):

 

Intangible assets:    March 31,
2018		      December 31,
2017		  

Customer backlog

    $ 4,000      $ 4,000  

Trade names and trademarks

      900        900  
  

 

 

     

 

 

  

Total intangible assets

      4,900        4,900  
  

 

 

     

 

 

  

Accumulated amortization:

      

Customer backlog

      (2,667 )       (1,666 ) 

Trade name

      (600 )       (376 ) 
  

 

 

     

 

 

  

Total accumulated amortization

      (3,267 )       (2,042 ) 
  

 

 

     

 

 

  

Intantible assets, net

    $ 1,633      $ 2,858  
  

 

 

     

 

 

  

Intangible asset amounts were determined based on the estimated economics of the asset and are amortized over the estimated useful lives on a straight-line basis over 12 months, which approximates the pattern in which the economic benefits are expected to be received. Intangible asset amortization expense for the quarterly period ended March 31, 2018 was $1.2 million.