FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of fair value of long-term debt, including current maturities, and advances for construction

Advances for construction fair values were estimated using broker quotes from companies that frequently purchase these investments.

	December 31, 2019
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities, net	$	808,622	$	—	$	873,454	$	—	$	873,454
Advances for construction	191,062		—		79,550		—		79,550
Total	$	999,684	$	—	$	953,004	$	—	$	953,004

	December 31, 2018
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities, net	$	814,938	$	—	$	849,551	$	—	$	849,551
Advances for construction	186,342		—		77,204		—		77,204
Total	$	1,001,280	$	—	$	926,755	$	—	$	926,755