Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Property, plant and equipment
Operational Mining Properties Gross		$ 1,377,235	$ 1,358,189
Mineral Interest		809,912	809,912
Land		9,000	8,318
Buildings and Improvements, Gross	[1]	1,416,594	947,435
Property, Plant and Equipment, Gross		3,774,932	3,736,719
Accumulated depreciation and amortization	[2]	(2,077,005)	(2,048,431)
Construction in Progress, Gross	[3]	162,191	612,865
Property, plant and equipment and mining properties, net		$ 1,697,927	$ 1,688,288

[1] Includes $120.8 million and $127.6 million associated with facilities and equipment assets under finance leases at March 31, 2024 and December 31, 2023, respectively.

[2] Includes $40.1 million and $37.6 million of accumulated amortization related to assets under finance leases at March 31, 2024 and December 31, 2023, respectively. Commissioning of Rochester’s new three-stage crushing circuit and truck load-out facility was completed on March 7, 2024. The crushing circuit has routinely exceeded 70,000 tons per day since commissioning was completed leading to declaration of commercial production and $528 million of construction in process placed into service during the quarter. Ramp-up to sustained nameplate capacity of 88,000 tons per day remains on schedule for the end of the second quarter.

[3] Includes $18.0 million and $471.7 million of construction costs related to the Rochester Expansion project at March 31, 2024 and December 31, 2023, respectively.