FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities	$	557,953			$	630,510			$	630,510
Advances for construction	182,448				74,460				74,460
Total	$	740,401	$	—	$	704,970	$	—	$	704,970

	December 31, 2015
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities	$	514,045	$	—	$	600,440	$	—	$	600,440
Advances for construction	180,172		—		72,866		—		72,866
Total	$	694,217	$	—	$	673,306	$	—	$	673,306