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Fair Value of Financial Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of fair value of long-term debt, including current maturities and advances for construction
 June 30, 2021
  Fair Value
 CostLevel 1Level 2Level 3Total
Long-term debt, including current maturities, net$1,065,109 — $1,323,208 — $1,323,208 
 
 December 31, 2020
  Fair Value
 CostLevel 1Level 2Level 3Total
Long-term debt, including current maturities, net$786,227 $— $944,447 $— $944,447