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Lease Obligations (Schedule of Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases $ 41,655 $ 31,703
Less: future finance charges (12,250) (12,206)
Present value of minimum lease payments 29,405 19,497
Less current portion (10,523) (6,978)
Non-current portion 18,882 12,519
Lease Obligation Mining Equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases 29,300  
Lease Obligation Other Leases    
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases 100  
Not later than one year [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases 12,292 7,367
Later than one year and not later than five years [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases 13,380 10,209
Later than five years [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Operating leases $ 15,983 $ 14,127