Divestitures	9 Months Ended
Sep. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Divestitures	Divestitures On September 14, 2017, the Company closed on its’ definitive agreement to sell Lone Mountain Processing LLC, an operating mine complex within the Company’s metallurgical coal segment, and two idled mining companies, Cumberland River Coal LLC and Powell Mountain Energy LLC to Revelation Energy LLC. The Company received $8.3 million of proceeds offset by $1.3 million in disbursements related to landholder consent fees and professional fees; and recorded a gain of $21.6 million which is reflected as a separate line, “Gain on sale of Lone Mountain Processing, Inc.,” within the Condensed Consolidated Statement of Operations. The gain included a $4.7 million curtailment gain related to black lung liabilities accrued for active employees at these operations, $0.5 million curtailment gain related to postretirement medical claims.

Divestitures

9 Months Ended

Sep. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

On September 14, 2017, the Company closed on its’ definitive agreement to sell Lone Mountain Processing LLC, an operating mine complex within the Company’s metallurgical coal segment, and two idled mining companies, Cumberland River Coal LLC and Powell Mountain Energy LLC to Revelation Energy LLC. The Company received $8.3 million of proceeds offset by $1.3 million in disbursements related to landholder consent fees and professional fees; and recorded a gain of $21.6 million which is reflected as a separate line, “Gain on sale of Lone Mountain Processing, Inc.,” within the Condensed Consolidated Statement of Operations. The gain included a $4.7 million curtailment gain related to black lung liabilities accrued for active employees at these operations, $0.5 million curtailment gain related to postretirement medical claims.