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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 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 June 30, 2021Fair Value Measurements at December 31, 2020
DescriptionLevel 1Level 2Level 3Level 1Level 2Level 3
Gas Derivatives$— $(379,943)$— $— $117,545 $— 
Interest Rate Swaps$— $(9,612)$— $— $(14,270)$— 
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:
 June 30, 2021December 31, 2020
 Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Cash and Cash Equivalents$39,365 $39,365 $15,617 $15,617 
Long-Term Debt (Excluding Debt Issuance Costs)$2,313,927 $2,594,481 $2,450,853 $2,638,251