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Fair Value Disclosure | 12 Months Ended
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Dec. 31, 2019
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 |  | December 31, 2019 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  |  |  |  |  |  |  |
Equity securities |  | $ | 10,120 |  |  | $ | 10,120 |  |  | $ | — |  |  | $ | — |
|  | $ | 10,120 |  |  | $ | 10,120 |  |  | $ | — |  |  | $ | — |
|  |  |  | Fair Value Measurements at Reporting Date Using
|  |  |  | Quoted Prices in |  |  |  | Significant
|  |  |  | Active Markets for |  | Significant Other |  | Unobservable
|  |  |  | Identical Assets |  | Observable Inputs |  | Inputs
Description |  | December 31, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  |  |  |  |  |  |  |
Equity securities |  | $ | 8,716 |  |  | $ | 8,716 |  |  | $ | — |  |  | $ | — |
|  | $ | 8,716 |  |  | $ | 8,716 |  |  | $ | — |  |  | $ | — |
Bellaire's Mine Water Treatment Trust invests in available for sale 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. On January 1, 2018, the Mine Water Treatment Trust's unrealized gain of $2.7 million was reclassified within the Consolidated Balance Sheet upon adoption of ASU No. 2016-01. The Mine Water Treatment Trust realized a (gain)/loss of $(1.5) million and $0.3 million in the years ended December 31, 2019 and 2018, respectively, in the "Other (income) expense " section of the Consolidated Statements of Operations. See Note 7 for further discussion of Bellaire's Mine Water Treatment Trust. There were no transfers into or out of Levels 1, 2 or 3 during the year ended December 31, 2019. Other Fair Value Measurement Disclosures: The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to the short-term maturities of these instruments. The fair values of revolving credit agreements and long-term debt, excluding finance leases, were determined using current rates offered for similar obligations taking into account subsidiary credit risk, which is Level 2 as defined in the fair value hierarchy. The fair value and the book value of revolving credit agreements and long-term debt, excluding finance leases, was $24.3 million and $24.3 million, respectively, at December 31, 2019 and $10.4 million and $10.6 million, respectively, at December 31, 2018. Financial instruments that potentially subject the Company to concentration of credit risk consist principally of accounts receivable. Under its mining contracts, the Company recognizes revenue and a related receivable as coal or limestone is delivered. These mining contracts provide for monthly settlements. The Company's significant credit concentration is uncollateralized; however, historically minimal credit losses have been incurred. To further reduce credit risk associated with accounts receivable, the Company performs periodic credit evaluations of its customers, but does not generally require advance payments or collateral.

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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=117815213&loc=d3e19207-110258 + Details
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