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Other Events	3 Months Ended
Other Events	Mar. 31, 2023
Other Events [Abstract]
Other Events	Other Events Shoal Creek Incident On March 29, 2023, the Company’s Shoal Creek Mine experienced a fire involving void fill material utilized to stabilize the roof structure of the mine. All mine personnel were safely evacuated from the mine. The Mine Safety and Health Administration (MSHA) has allowed mine rescue-equipped personnel into the mine at various times to assess the situation. On April 26, 2023, MSHA approved a temporary sealing program which was completed on April 28, 2023, and the Company continues to monitor air quality in the affected underground area. Port and Rail Capacity Assignment During the three months ended March 31, 2023, the Company entered into an agreement to assign the right to its excess port and rail capacity related to its North Goonyella Mine to an unrelated party in exchange for $30.0 million Australian dollars. Half of such amount was received by the Company upon entry into the agreement, and half is payable in June 2024, subject to certain conditions. The Company recorded revenue of $19.2 million and a discounted long-term receivable of $9.2 million in connection with the transaction during the three months ended March 31, 2023.