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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
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, 2021Fair Value Measurements at December 31, 2020
DescriptionLevel 1Level 2Level 3Level 1Level 2Level 3
Gas Derivatives$— $(976,170)$— $— $117,545 $— 
Interest Rate Swaps$— $(5,786)$— $— $(14,270)$— 
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, 2021December 31, 2020
 Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Cash and Cash Equivalents (Excluding Restricted Cash)$3,565 $3,565 $15,617 $15,617 
Restricted Cash*$— $— 5,982 5,982 
Long-Term Debt (Excluding Debt Issuance Costs)$2,231,517 $2,483,019 $2,450,853 $2,638,251 
*The December 31, 2020 restricted cash balance includes $735 and $5,247 located in current assets and other non-current assets, respectively, in the Consolidated Balance Sheets.