Fair Value of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 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.

	September 30, 2016
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities	$	561,666	—		$	679,712	—		$	679,712
Advances for construction	182,001		—		74,440		—		74,440
Total	$	743,667	$	—	$	754,152	$	—	$	754,152

	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