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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of fair value of long-term debt, including current maturities, and advances for construction
 December 31, 2020
 Fair Value
 CostLevel 1Level 2Level 3Total
Long-term debt, including current maturities, net$786,227 $— $944,447 $— $944,447 
 December 31, 2019
 Fair Value
 CostLevel 1Level 2Level 3Total
Long-term debt, including current maturities, net$808,622 $— $873,454 $— $873,454