Fair Value of Financial Assets and Liabilities (Tables)

3 Months Ended

Mar. 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.

	March 31, 2019
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities, net	$	815,612	—		$	868,919	—		$	868,919
Advances for construction	186,877		—		79,400		—		79,400
Total	$	1,002,489	$	—	$	948,319	$	—	$	948,319

	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