Annual report pursuant to Section 13 and 15(d)

PROPERTY AND EQUIPMENT. (Tables)

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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):

 

    December 31,  
    2017     2016  
Facilities and plant equipment   $ 601,156     $ 530,735  
Land     8,970       7,771  
Other equipment, vehicles and furniture     10,189       9,714  
Construction in progress     38,041       29,393  
      658,356       577,613  
Accumulated depreciation     (150,004 )     (112,423 )
    $ 508,352     $ 465,190