Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Surety Bonds Outstanding	$ 587,300	$ 587,300
Letters of credit outstanding	94,800	94,800
Cash collateral for surety bond	5,600	5,600
Contribution to fund asset retirement obligations		80,000
Long-term asset retirement obligation	100,000	100,000	$ 20,000
Asset retirement obligations
Loss Contingencies [Line Items]
Reclamation-related obligations	216,000	216,000
Surety Bonds Outstanding	498,500	498,500
Letters of credit outstanding	20,000	20,000
Cash collateral for surety bond	600	600
Contribution to fund asset retirement obligations	60,000
Long-term asset retirement obligation	$ 100,000	$ 100,000