Gain on Property Insurance Recovery Related to Mountain Laurel Longwall	6 Months Ended
Jun. 30, 2020
Gain on Property Insurance Recovery Related to Mountain Laurel Longwall
Gain on Property Insurance Recovery Related to Mountain Laurel Longwall	4. Gain on Property Insurance Recovery Related to Mountain Laurel Longwall The Company recorded a $14.5 million and $23.5 million gain related to a property insurance recovery on the longwall shields at its Mountain Laurel operation during the three and six months ended June 30, 2020, respectively. As a result of geologic conditions in the final longwall panel, Mountain Laurel was unable to recover 123 of the longwall system’s 176 hydraulic shields. All of the cash associated with the insurance recovery was received by the end of the quarter.

The entire disclosure for business interruption insurance recoveries. Includes, but is not limited to, the nature of the event resulting in business interruption losses, amount of business interruption insurance recoveries recognized, and line item in the statement of income in which those recoveries are classified.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=114868818

Name:	us-gaap_BusinessInsuranceRecoveriesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration