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Discontinued Operations - Patriot Related Matters (Details) |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2017 USD ($) | Jun. 30, 2020 USD ($) retirees | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) retirees | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Oct. 09, 2015 buyers | Dec. 31, 2007 USD ($) | Oct. 31, 2007 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Retirees | retirees |  | 0 |  | 0 |  |  |  |  |
Estimated fund obligation |  |  |  |  |  |  |  |  | $ 40,000,000
Loss from discontinued operations, net of income taxes |  | $ (2,300,000) | $ (3,400,000) | $ (4,500,000) | $ (6,800,000) |  |  |  |
Amount contributed to the Combined Benefit Fund |  | 400,000 | 500,000 | 800,000 | 1,000,000.0 |  |  |  |
CombinedBenefitFundLowerEstimate |  | 1,000,000 |  |  |  |  |  |  |
CombinedBenefitFundFutureEstimate |  | 2,000,000 |  |  |  |  |  |  |
Combined Benefit Fund Liability |  | 14,700,000 |  | 14,700,000 |  | $ 15,200,000 |  |  |
Combined benefit fund [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Loss from discontinued operations, net of income taxes |  | 100,000 | $ 100,000 | 200,000 | $ 300,000 |  |  |  |
Patriot |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Buyers | buyers |  |  |  |  |  |  | 2 |  |
Spinoff | Patriot | Black Lung Occupational Disease Liability |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Initially Determined Potential Exposure from Patriot Bankruptcy |  |  |  |  |  |  |  | $ 150,000,000 |
Potential Exposure from Patriot Bankruptcy |  | 85,700,000 |  | 85,700,000 |  | 85,700,000 |  |  |
Spinoff | UMWA 1974 Pension Plan (UMWA Plan) Litigation | Patriot |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Settlement of claim, amount awarded to other party | $ 75,000,000 |  |  |  |  |  |  |  |
Litigation settlement, liability |  | $ 12,500,000 |  | $ 12,500,000 |  | $ 26,000,000.0 |  |  |

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