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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Fair Values of Financial Instruments Not Carried at Fair Value
The carrying value and fair value of the financial instrument that is not carried at fair value in the accompanying consolidated balance sheet at September 30, 2020 and December 31, 2019 is as follows:
September 30, 2020December 31, 2019
(In thousands)Carrying Value Fair ValueCarrying Value Fair Value
 Long-term debt$390,787 $392,000 $389,835 $412,000 
Schedule of Classification of Outstanding Derivative Instruments and Fair Value Hierarchy
The following table presents the classification of the outstanding derivative instruments and the fair value hierarchy table for the Company’s derivative assets and liabilities that are required to be measured at fair value on a recurring basis:

Fair Value Measurements Using
(In thousands)Level 1Level 2Level 3Total Fair ValueNettingCarrying Amount
September 30, 2020
Current assets:
Natural gas derivative instruments$— $2,181 $— $2,181 $(2,181)$— 
Current liabilities:
Natural gas derivative instruments$— $4,389 $— $4,389 $(2,181)$2,208