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Intangible Contract Assets and Liabilities (Notes) | 12 Months Ended
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Dec. 31, 2017
Intangible Contract Assets and Liabilities Disclosure [Abstract] |
Intangible Assets and Liabilities [Text Block] | Intangible Contract Assets and Liabilities As described in Note 2. “Emergence from the Chapter 11 Cases and Fresh Start Reporting,” at the Effective Date, the Company recorded intangible assets of $314.9 million and liabilities of $58.7 million to reflect the inherent fair value of certain U.S. coal supply agreements as a result of favorable and unfavorable differences between contract terms and estimated market terms for the same coal products, and also recorded intangible liabilities of $116.2 million related to unutilized capacity under its port and rail take-or-pay contracts. The balances and respective balance sheet classifications of such assets and liabilities at December 31, 2017, net of accumulated amortization, are set forth in the following table:
| Successor
| December 31, 2017
| (Dollars in millions)
| Assets |  | Liabilities |  | Net Total
Coal supply agreements | $ | 177.2 |  |  | $ | (42.7 | ) |  | $ | 134.5 |
Take-or-pay contracts | — |  |  | (106.1 | ) |  | (106.1 | )
Total | $ | 177.2 |  |  | $ | (148.8 | ) |  | $ | 28.4 |
Balance sheet classification: |  |  |  |  |
Investments and other assets | $ | 177.2 |  |  | $ | — |  |  | $ | 177.2 |
Accounts payable and accrued expenses | — |  |  | (42.0 | ) |  | (42.0 | )
Other noncurrent liabilities | — |  |  | (106.8 | ) |  | (106.8 | )
Total | $ | 177.2 |  |  | $ | (148.8 | ) |  | $ | 28.4 |
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 $121.3 million during the Successor period April 2, 2017 through December 31, 2017. The Company anticipates net amortization of coal supply agreements, based upon expected future shipments, to be an expense of approximately $100 million, $25 million, $7 million, $1 million and $1 million for the years 2018 through 2022, respectively. 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 $22.5 million during the Successor period April 2, 2017 through December 31, 2017. The Company anticipates net amortization of take-or-pay contract intangible liabilities to be approximately $30 million, $20 million, $10 million, $5 million and $5 million, for the years 2018 through 2022, respectively.

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