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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 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 June 30, 2018
 
Fair Value Measurements at December 31, 2017
Description

(Level 1)
 

(Level 2)
 

(Level 3)
 

(Level 1)
 

(Level 2)
 

(Level 3)
Gas Derivatives
$

 
$
121,003

 
$

 
$

 
$
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:
 
June 30, 2018
 
December 31, 2017
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Cash and Cash Equivalents
$
54,846

 
$
54,846

 
$
509,167

 
$
509,167

Long-Term Debt
$
2,342,254

 
$
2,329,810

 
$
2,204,825

 
$
2,281,282