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Equity Method Investments	3 Months Ended
Equity Method Investments	Mar. 31, 2018
Financing Receivables [Abstract]
Equity Method Investments and Financing Receivables	Equity Method Investments The Company had total equity method investments of $72.3 million and $83.8 million reflected in “Investments and other assets” in the condensed consolidated balance sheets as of March 31, 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 and financing receivables 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 $35.8 million and $31.0 million during the three months ended March 31, 2018 and 2017, respectively.