Fair Value of Financial Assets and Liabilities (Tables)

3 Months Ended

Mar. 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.

	March 31, 2016
			Fair Value
	Cost		Level 1		Level 2		Level 3		Total
Long-term debt, including current maturities	$	563,962			$	673,972			$	673,972
Advances for construction	180,210				74,539				74,539
Total	$	744,172	$	—	$	748,511	$	—	$	748,511

	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