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Other Events	3 Months Ended
Other Events	Mar. 31, 2021
Other Events [Abstract]
Other Events	Other Events Cost Repositioning Program From time to time, the Company initiates restructuring activities in connection with its repositioning efforts to appropriately align its cost structure or optimize its coal production relative to prevailing market conditions. Costs associated with restructuring actions can include the impact of early mine closures, voluntary and involuntary workforce reductions, office closures and other related activities. Costs associated with restructuring activities are recognized in the period incurred. Such charges included as “Restructuring charges” in the Company's unaudited condensed consolidated statements of operations amounted to $2.1 million and $6.5 million for the three months ended March 31, 2021 and 2020, respectively, and were associated with both involuntary and voluntary workforce reductions. The Shoal Creek Mine remains idled as the Company continues activities to increase productivity, lower costs and improve yields from the operation in the future. The restart of mine production and coal shipments is contingent upon successful completion of these initiatives and stable customer demand. Included in the initiatives is a preparation plant upgrade project, which is anticipated to be commissioned by the middle of the third quarter of 2021. Additionally, the Shoal Creek labor contract expired on April 1, 2021 and negotiations with the workforce are ongoing. While discussions are ongoing with customers and workforce, the Metropolitan Mine full workforce returned to the mine in early May. Development work at the mine has been ongoing through the idle period and longwall production is anticipated to restart in the second quarter of 2021, with ramp up to full production in the third quarter of 2021.