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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 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 September 30, 2021Fair Value Measurements at December 31, 2020
DescriptionLevel 1Level 2Level 3Level 1Level 2Level 3
Gas Derivatives$— $(1,756,122)$— $— $117,545 $— 
Interest Rate Swaps$— $(8,196)$— $— $(14,270)$— 
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, 2021December 31, 2020
 Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Cash and Cash Equivalents (Excluding Restricted Cash)$365 $365 $15,617 $15,617 
Restricted Cash*$220,386 $220,386 $5,982 $5,982 
Long-Term Debt (Excluding Debt Issuance Costs)$2,453,932 $2,719,220 $2,450,853 $2,638,251 
*The September 30, 2021 restricted cash balance is located in current assets in the Consolidated Balance Sheets. 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.