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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The financial instrument measured at fair value on a recurring basis is summarized below:
 Fair Value Measurements at December 31, 2020Fair Value Measurements at December 31, 2019
DescriptionLevel 1Level 2Level 3Level 1Level 2Level 3
Gas Derivatives$— $117,545 $— $— $405,781 $— 
Interest Rate Swaps$— $(14,270)$— $— $(1,219)$— 
Fair Value, by Balance Sheet Grouping
The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows:
 December 31, 2020December 31, 2019
 Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Cash and Cash Equivalents$15,617 $15,617 $16,283 $16,283 
Long-Term Debt (Excluding Debt Issuance Costs)$2,450,853 $2,638,251 $2,763,433 $2,619,676