Schedule of Change in Reclamation Liability (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Commitments And Contingencies Schedule Of Change In Reclamation Liability 1	$ 4,613
Commitments And Contingencies Schedule Of Change In Reclamation Liability 2	5,598
Commitments And Contingencies Schedule Of Change In Reclamation Liability 3	287
Commitments And Contingencies Schedule Of Change In Reclamation Liability 4	357
Commitments And Contingencies Schedule Of Change In Reclamation Liability 5	4,900
Commitments And Contingencies Schedule Of Change In Reclamation Liability 6	$ 5,955