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PROPERTY, PLANT AND EQUIPMENT
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant, and equipment at June 30, 2022 and December 31, 2021 consist of the following (in thousands):
 June 30, 2022December 31, 2021
Plant, equipment, and water and sewer lines$319,418 $311,041 
Computers, office equipment and software2,668 2,659 
Total property, plant and equipment322,086 313,700 
Depreciation of property, plant, and equipment is computed based on the estimated useful lives as follows:
Useful Lives
Plant, equipment, and water and sewer lines
5 to 50 years
Computers, office equipment and software
3 to 15 years