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Fair Value Disclosure | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Fair Value Disclosure | Fair Value Disclosure Recurring Fair Value Measurements: The following table presents the Company's assets and liabilities accounted for at fair value on a recurring basis:
|  |  |  | Fair Value Measurements at Reporting Date Using
|  |  |  | Quoted Prices in |  |  |  | Significant
|  |  |  | Active Markets for |  | Significant Other |  | Unobservable
|  |  |  | Identical Assets |  | Observable Inputs |  | Inputs
Description |  | Date |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | September 30, 2021 |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Equity securities |  | $ | 15,120 |  |  | $ | 15,120 |  |  | $ | — |  |  | $ | — |
|  | $ | 15,120 |  |  | $ | 15,120 |  |  | $ | — |  |  | $ | — |
|  | December 31, 2020 |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Equity securities |  | $ | 13,164 |  |  | $ | 13,164 |  |  | $ | — |  |  | $ | — |
|  | $ | 13,164 |  |  | $ | 13,164 |  |  | $ | — |  |  | $ | — |
Bellaire Corporation (“Bellaire”) is a non-operating subsidiary of the Company with legacy liabilities relating to closed mining operations, primarily former Eastern U.S. underground coal mining operations. Prior to 2019, Bellaire established a $5.0 million mine water treatment trust (the "Mine Water Treatment Trust") to provide a financial assurance mechanism to assure the long-term treatment of post-mining discharge. Bellaire's Mine Water Treatment Trust invests in equity securities that are reported at fair value based upon quoted market prices in active markets for identical assets; therefore, they are classified as Level 1 within the fair value hierarchy. The Company recognized a gain of less than $0.1 million and $1.0 million during the three and nine months ended September 30, 2021, respectively, and a gain of $0.5 million and $0.4 million in the three and nine months ended September 30, 2020, respectively, related to the Mine Water Treatment Trust. During the second quarter of 2020, the Company invested $2.0 million in equity securities of a public company with a diversified portfolio of royalty producing mineral interests. The investment is reported at fair value based upon quoted market prices in active markets for identical assets; therefore, it is classified as Level 1 within the fair value hierarchy. The Company recognized a gain of $0.4 million and $1.6 million during the three and nine months ended September 30, 2021, respectively, and a loss of $0.5 million and $0.1 million in the three and nine months ended September 30, 2020 related to the investment in these equity securities. The gains and losses related to equity securities are reported on the line (Gain) loss on equity securities in the Other (income) expense section of the Unaudited Condensed Consolidated Statements of Operations. There were no transfers into or out of Levels 1, 2 or 3 during the nine months ended September 30, 2021 and 2020.

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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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