Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Property, plant and equipment
Operational Mining Properties Gross		$ 1,502,457	$ 1,358,189
Mineral Interest		833,564	809,912
Land		9,000	8,318
Buildings and Improvements, Gross	[1]	1,517,170	947,435
Property, Plant and Equipment, Gross		4,007,923	3,736,719
Accumulated depreciation and amortization	[2]	(2,190,307)	(2,048,431)
Construction in Progress, Gross	[3]	145,732	612,865
Property, plant and equipment and mining properties, net		$ 1,817,616	$ 1,688,288

[1] Includes $170.1 million and $127.6 million associated with facilities and equipment assets under finance leases at December 31, 2024 and December 31, 2023, respectively.

[2] Includes $63.3 million and $37.6 million of accumulated amortization related to assets under finance leases at December 31, 2024 and December 31, 2023, respectively.

[3] Includes $471.7 million of construction costs related to the Rochester expansion project at December 31, 2023.