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Intangible Contract Assets and Liabilities | 12 Months Ended
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Dec. 31, 2019
Intangible Contract Assets and Liabilities Disclosure [Abstract] |
Intangible Assets and Liabilities [Text Block] | Intangible Contract Assets and Liabilities The Company has recorded intangible assets and liabilities to reflect the fair value of certain U.S. coal supply agreements as a result of differences between contract terms and estimated market terms for the same coal products, and also recorded intangible liabilities related to unutilized capacity under its port and rail take-or-pay contracts. The balances, net of accumulated amortization, and respective balance sheet classifications at December 31, 2019 and 2018, are set forth in the following tables:
| December 31, 2019
| Assets |  | Liabilities |  | Net Total
| (Dollars in millions)
Coal supply agreements | $ | 20.7 |  |  | $ | (21.4 | ) |  | $ | (0.7 | )
Take-or-pay contracts | — |  |  | (40.0 | ) |  | (40.0 | )
Total | $ | 20.7 |  |  | $ | (61.4 | ) |  | $ | (40.7 | )
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 20.7 |  |  | $ | — |  |  | $ | 20.7 |
Accounts payable and accrued expenses | — |  |  | (8.4 | ) |  | (8.4 | )
Other noncurrent liabilities | — |  |  | (53.0 | ) |  | (53.0 | )
Total | $ | 20.7 |  |  | $ | (61.4 | ) |  | $ | (40.7 | )
| December 31, 2018
| Assets |  | Liabilities |  | Net Total
| (Dollars in millions)
Coal supply agreements | $ | 70.9 |  |  | $ | (32.9 | ) |  | $ | 38.0 |
Take-or-pay contracts | — |  |  | (57.1 | ) |  | (57.1 | )
Total | $ | 70.9 |  |  | $ | (90.0 | ) |  | $ | (19.1 | )
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 70.9 |  |  | $ | — |  |  | $ | 70.9 |
Accounts payable and accrued expenses | — |  |  | (20.3 | ) |  | (20.3 | )
Other noncurrent liabilities | — |  |  | (69.7 | ) |  | (69.7 | )
Total | $ | 70.9 |  |  | $ | (90.0 | ) |  | $ | (19.1 | )
Amortization of the intangible assets and liabilities related to coal supply agreements occurs ratably based upon coal volumes shipped per contract and is recorded as a component of “Depreciation, depletion and amortization” in the accompanying consolidated statements of operations. Such amortization amounted to $23.2 million, $93.0 million and $121.3 million during the years ended December 31, 2019 and 2018 and the period April 2 through December 31, 2017 respectively. During the year ended December 31, 2019, the Company also charged to expense intangible assets of $15.5 million related to a coal supply agreement deemed to have been impaired, as further described in Note 5. “Asset Impairment.” The Company anticipates net amortization of sales contracts, based upon expected shipments, to be an expense of approximately $7 million and $1 million for the years 2020 and 2021, respectively, and credits of $2 million per year for the years 2022 through 2024, and $3 million in total thereafter. Future unutilized capacity and the amortization periods related to the take-or-pay contract intangible liabilities are based upon estimates of forecasted usage. Such amortization, which is classified as a reduction to “Operating costs and expenses” in the accompanying consolidated statements of operations, amounted to $16.6 million, $26.6 million and $22.5 million during the years ended December 31, 2019 and 2018 and the period April 2 through December 31, 2017 respectively. The Company anticipates net amortization of take-or-pay contract intangible liabilities for the years 2020 through 2024 to be approximately $8 million, $4 million, $3 million, $3 million and $3 million, respectively, and $19 million in total thereafter.

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