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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events During September 2019, the Company entered into a definitive agreement to acquire 20 million tons of low-cost, high quality, High-Vol A coking coal reserves directly adjacent to its Leer mine for $52.5 million. The reserves are contiguous to the existing Leer mine reserves and accessible underground by the longwall operation without meaningful incremental capital. The reserve addition is expected to extend the life of the Leer mine approximately six years. Closing of the transaction is subject to title work and satisfaction of closing conditions and is anticipated to close during the fourth quarter of 2019.