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Equity Method Investments	9 Months Ended
Equity Method Investments	Sep. 30, 2018
Financing Receivables [Abstract]
Equity Method Investments and Financing Receivables	Equity Method Investments The Company had total equity method investments of $66.4 million and $82.1 million reflected in “Investments and other assets” in the condensed consolidated balance sheets as of September 30, 2018 and December 31, 2017, respectively, related to Middlemount Coal Pty Ltd (Middlemount). As noted in Note 2. “Emergence from the Chapter 11 Cases and Fresh Start Reporting” in the Company's Annual Report on Form 10-K for the year ended December 31, 2017, the carrying value of the equity method investments was adjusted to fair value in connection with fresh start reporting based on the net present value of future cash flows associated with the Company’s 50% equity interest in Middlemount. The Company received cash payments from Middlemount of $81.1 million during the nine months ended September 30, 2018, and $35.2 million and $31.1 million during the periods April 2 through September 30, 2017 and January 1 through April 1, 2017, respectively.