Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax liabilities:
Mineral Properties	$ 344,152	$ 461,742
Mexican mining royalty tax	76,386	0
Foreign subsidiaries - unremitted earnings	182,464	247,000
Inventory	2,746
Property, plant and equipment, net	33,094	60,266
Deferred tax liabilities, Total	638,842	769,008
Deferred tax assets:
Net operating loss carryforwards	130,170	99,323
Foreign subsidiaries - future tax credits	163,947	145,395
Royalty and other long-term debt	11,616	42,221
Capital loss carryforwards	34,930	35,315
Asset retirement obligation	18,589	8,623
Unrealized foreign currency loss and other	9,567	1,590
Accrued expenses	14,756	20,692
Tax credit carryforwards	23,585	22,811
Inventory	0	1,418
Deferred tax assets, gross	407,160	377,388
Valuation allowance	289,378	182,576
Deferred tax assets, net	117,782	194,812
Net deferred tax liabilities	$ (521,060)	$ (574,196)