Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Property, plant and equipment
Operational Mining Properties Gross		$ 1,554,357	$ 1,502,457
Mineral Interest		1,683,564	833,564
Land		9,961	9,000
Buildings and Improvements, Gross	[1]	1,685,851	1,517,170
Property, Plant and Equipment, Gross		5,051,424	4,007,923
Accumulated depreciation and amortization	[2]	(2,251,669)	(2,190,307)
Construction in Progress, Gross		117,691	145,732
Property, plant and equipment and mining properties, net		$ 2,799,755	$ 1,817,616

[1] Includes $164.7 million and $170.1 million associated with facilities and equipment assets under finance leases at March 31, 2025 and December 31, 2024, respectively.

[2] Includes $67.4 million and $63.3 million of accumulated amortization related to assets under finance leases at March 31, 2025 and December 31, 2024, respectively.