Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The financial instruments measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements at September 30, 2018						Fair Value Measurements at December 31, 2017
Description	(Level 1)		(Level 2)		(Level 3)		(Level 1)		(Level 2)			(Level 3)
Gas Derivatives	$	—	$	136,184	$	—	$	—	$	59,949		$	—
Put Option	$	—	$	—	$	—	$	—	$	(3,500	)	$	—

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis

The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows:

	September 30, 2018				December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Cash and Cash Equivalents	$	42,672	$	42,672	$	509,167	$	509,167
Long-Term Debt	$	2,194,003	$	2,169,446	$	2,204,825	$	2,281,282