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Fair Value of Financial Instruments | 6 Months Ended
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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 1 |  | Level 2 |  | Level 3 |  | Total
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.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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