Debt	6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	Debt On April 1, 2016, the Company entered into an Asset-Based Revolving Credit Agreement (the “ABL Facility”) with certain lenders and Citibank, N.A. (together with its affiliates, “Citibank”), as administrative agent and collateral agent, with an aggregate lender commitment to make a revolving loan of up to $50.0 million, subject to borrowing base availability. On January 23, 2017, the Company entered into Amendment No. 1 to the ABL Facility to, among other things, (i) increase the aggregate lender commitment to $100.0 million, (ii) reduce the applicable interest rate margins by 100 basis points ("bps"), (iii) permit the corporate conversion and (iv) allow the IPO to be consummated without triggering a change of control. On March 24, 2017, the Company entered into Amendment No. 2 to the ABL Facility to modify certain terms relating to the restricted payment covenant, which provides the Company with improved flexibility to pay dividends, including the Special Distribution. On May 15, 2017, the Company entered into an Amendment No. 3 to the ABL Facility to, among other things, (i) allow for the posting of cash collateral to secure certain swap and hedging arrangements permitted under the ABL Facility and (ii) allow for the payment of dividends permitted under the ABL Facility within 60 days of declaration thereof. At June 30, 2017 (Successor), the Company had $100.0 million of availability under the ABL Facility. In connection with the Asset Acquisition, the Company assumed a security agreement and promissory note, which had an outstanding balance of $5.2 million as of June 30, 2017 (Successor), of which $2.9 million was classified as a current obligation. The amount owed in respect of the promissory note was originally used for the purchase of underground mining equipment and such note is secured by the same mining equipment. The promissory note matures on March 31, 2019 and bears a fixed interest rate of 4.00% per annum. The Company is required to make monthly payments of principal and interest during the term of the promissory note.

Debt

On April 1, 2016, the Company entered into an Asset-Based Revolving Credit Agreement (the “ABL Facility”) with certain lenders and Citibank, N.A. (together with its affiliates, “Citibank”), as administrative agent and collateral agent, with an aggregate lender commitment to make a revolving loan of up to $50.0 million, subject to borrowing base availability. On January 23, 2017, the Company entered into Amendment No. 1 to the ABL Facility to, among other things, (i) increase the aggregate lender commitment to $100.0 million, (ii) reduce the applicable interest rate margins by 100 basis points ("bps"), (iii) permit the corporate conversion and (iv) allow the IPO to be consummated without triggering a change of control. On March 24, 2017, the Company entered into Amendment No. 2 to the ABL Facility to modify certain terms relating to the restricted payment covenant, which provides the Company with improved flexibility to pay dividends, including the Special Distribution. On May 15, 2017, the Company entered into an Amendment No. 3 to the ABL Facility to, among other things, (i) allow for the posting of cash collateral to secure certain swap and hedging arrangements permitted under the ABL Facility and (ii) allow for the payment of dividends permitted under the ABL Facility within 60 days of declaration thereof. At June 30, 2017 (Successor), the Company had $100.0 million of availability under the ABL Facility.

In connection with the Asset Acquisition, the Company assumed a security agreement and promissory note, which had an outstanding balance of $5.2 million as of June 30, 2017 (Successor), of which $2.9 million was classified as a current obligation. The amount owed in respect of the promissory note was originally used for the purchase of underground mining equipment and such note is secured by the same mining equipment. The promissory note matures on March 31, 2019 and bears a fixed interest rate of 4.00% per annum. The Company is required to make monthly payments of principal and interest during the term of the promissory note.