PROPERTY, PLANT AND EQUIPMENT AND CONSTRUCTION-IN-PROCESS - Construction-in-process (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Construction-in-process	$ 755,589,000	$ 814,967,000
Projects under exploration and development
Property, Plant and Equipment [Line Items]
Construction-in-process	193,703,000	162,476,000	$ 95,268,000	$ 50,702,000
Projects under exploration and development | Up-front bonus costs
Property, Plant and Equipment [Line Items]
Construction-in-process	5,331,000	5,335,000	5,335,000	5,335,000
Projects under exploration and development | Exploration and development costs
Property, Plant and Equipment [Line Items]
Construction-in-process	187,669,000	156,438,000	89,230,000	44,664,000
Projects under exploration and development | Interest capitalized
Property, Plant and Equipment [Line Items]
Construction-in-process	703,000	703,000	703,000	703,000
Projects under construction
Property, Plant and Equipment [Line Items]
Construction-in-process	561,886,000	652,491,000	797,930,000	670,781,000
Projects under construction | Up-front bonus costs
Property, Plant and Equipment [Line Items]
Construction-in-process	11,031,000	11,156,000	11,156,000	39,156,000
Projects under construction | Drilling and construction costs
Property, Plant and Equipment [Line Items]
Construction-in-process	529,773,000	618,416,000	761,129,000	611,553,000
Projects under construction | Interest capitalized
Property, Plant and Equipment [Line Items]
Construction-in-process	$ 21,082,000	$ 22,919,000	$ 25,645,000	$ 20,072,000