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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
The following table presents information about the Company’s financial liabilities measured at fair value on a recurring basis as of June 30, 2021 and indicates the level of the fair value hierarchy utilized to determine such fair value (in thousands):
 Fair Value Measurements as of June 30, 2021 Using:
Level 1Level 2Level 3Total
Liabilities:
Natural gas swap contracts$— $2,542 $— $2,542 
The Company had no assets or any other liabilities measured at fair value on a recurring basis as of December 31, 2020. During the six months ended June 30, 2021, there were no transfers between Level 1, Level 2 and Level 3. The Company uses quoted dealer prices for similar contracts in active over-the-counter markets for determining fair value of Level 2 liabilities. There were no changes to the valuation techniques used to measure liability fair values on a recurring basis during the six months ended June 30, 2021.
 The following methods and assumptions were used to estimate the fair value for which the fair value option was not elected:
Cash and cash equivalents, short-term investments, receivables and trade accounts payable—The carrying amounts reported in the Condensed Balance Sheets approximate fair value due to the short-term nature of these assets and liabilities.
Debt—The Company's outstanding debt is carried at cost. As of June 30, 2021, the Company had $40.0 million outstanding under the ABL Facility, with $21.0 million available, net of outstanding letters of credit of $9.4 million. As of December 31, 2020, the Company had $40.0 million outstanding under the ABL Facility and $9.4 million of letters of credit issued and outstanding under the ABL Facility. As of June 30, 2021 and December 31, 2020, the estimated fair value of the Notes based upon observable market data (Level 2) was approximately $349.4 million and $352.5 million, respectively. The carrying amount of the ABL Facility approximates fair value.