Equity Method Investments and Financing Receivables	6 Months Ended
Jun. 30, 2017
Financing Receivables [Abstract]
Equity Method Investments and Financing Receivables	Financing Receivables The Company had total equity method investments and financing receivables of $66.9 million and $84.8 million reflected in "Investments and other assets" in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016, respectively, related to Middlemount Coal Pty Ltd (Middlemount). As noted in Note 3. "Emergence from the Chapter 11 Cases and Fresh Start Reporting," 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 periodically makes loans to Middlemount pursuant to the related shareholders’ agreement for purposes of funding capital expenditures and working capital requirements. The Priority Loans (the amount loaned by the Company in excess of the amount loaned by the other shareholder) bear interest at a rate equal to the monthly average 30-day Australian Bank Bill Swap Reference Rate plus 3.5%. They were due to expire on June 30, 2017, but have been extended to December 31, 2018 in conjunction with a commercial agreement with the stockholders concerning the distribution of available cash against outstanding payables and the loans. The agreement requires the distribution of available cash at least twice each month. Available cash is defined as the amount in Middlemount's bank accounts that will not be required to pay known bills within the next 35 days. The available cash is distributed to stockholders in a 50/50 ratio, unless there is no marketing royalty payment overdue. In that situation, 100% of the available cash is distributed to the Company until its Priority Loans are repaid in full. Based on the existence of letters of support from related entities of the stockholders, the expected timing of repayment of these loans is projected to extend beyond the stated expiration date, and so the Company considers these loans to be of a long-term nature and in-substance equity. As a result, (i) the foreign currency impact related to the shareholder loans is included in foreign currency translation adjustment in the condensed consolidated balance sheets and the unaudited condensed consolidated statements of comprehensive income and (ii) interest income on the Priority Loans is recognized when cash is received. The Company received loan repayments from Middlemount of approximately $21.0 million during the Successor period April 2 through June 30, 2017 and approximately $31.1 million and $2.1 million during the Predecessor period January 1 through April 1, 2017 and the six months ended June 30, 2016, respectively. One of the Company's Australian subsidiaries and the other shareholder of Middlemount are parties to an agreement, as amended from time to time, to provide a revolving loan (Revolving Loans) to Middlemount not to exceed $50.0 million Australian dollars (Revolving Loan Limit). The Company’s participation in the Revolving Loans will not, at any time, exceed its 50% equity interest of the Revolving Loan Limit. The Revolving Loans bear interest at 15% per annum and expire on December 31, 2018. As of June 30, 2017 and December 31, 2016, the carrying value of the Revolving Loans due to the Company's Australian subsidiary was zero.

Financing Receivables

The Company had total equity method investments and financing receivables of $66.9 million and $84.8 million reflected in "Investments and other assets" in the condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016, respectively, related to Middlemount Coal Pty Ltd (Middlemount). As noted in Note 3. "Emergence from the Chapter 11 Cases and Fresh Start Reporting," 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 periodically makes loans to Middlemount pursuant to the related shareholders’ agreement for purposes of funding capital expenditures and working capital requirements. The Priority Loans (the amount loaned by the Company in excess of the amount loaned by the other shareholder) bear interest at a rate equal to the monthly average 30-day Australian Bank Bill Swap Reference Rate plus 3.5%. They were due to expire on June 30, 2017, but have been extended to December 31, 2018 in conjunction with a commercial agreement with the stockholders concerning the distribution of available cash against outstanding payables and the loans. The agreement requires the distribution of available cash at least twice each month. Available cash is defined as the amount in Middlemount's bank accounts that will not be required to pay known bills within the next 35 days. The available cash is distributed to stockholders in a 50/50 ratio, unless there is no marketing royalty payment overdue. In that situation, 100% of the available cash is distributed to the Company until its Priority Loans are repaid in full. Based on the existence of letters of support from related entities of the stockholders, the expected timing of repayment of these loans is projected to extend beyond the stated expiration date, and so the Company considers these loans to be of a long-term nature and in-substance equity. As a result, (i) the foreign currency impact related to the shareholder loans is included in foreign currency translation adjustment in the condensed consolidated balance sheets and the unaudited condensed consolidated statements of comprehensive income and (ii) interest income on the Priority Loans is recognized when cash is received. The Company received loan repayments from Middlemount of approximately $21.0 million during the Successor period April 2 through June 30, 2017 and approximately $31.1 million and $2.1 million during the Predecessor period January 1 through April 1, 2017 and the six months ended June 30, 2016, respectively.

One of the Company's Australian subsidiaries and the other shareholder of Middlemount are parties to an agreement, as amended from time to time, to provide a revolving loan (Revolving Loans) to Middlemount not to exceed $50.0 million Australian dollars (Revolving Loan Limit). The Company’s participation in the Revolving Loans will not, at any time, exceed its 50% equity interest of the Revolving Loan Limit. The Revolving Loans bear interest at 15% per annum and expire on December 31, 2018. As of June 30, 2017 and December 31, 2016, the carrying value of the Revolving Loans due to the Company's Australian subsidiary was zero.