Income and Mining Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Foreign Royalty Tax	$ 0	$ 15,451
Deferred Tax Liabilities Mineral Properties	69,799	0
Deferred Tax Liabilities, Undistributed Foreign Earnings	1,302	12,999
Deferred Tax Liabilities, Inventory	4,426	2,353
Deferred Tax Liabilities, Royalties and Long-Term Debt	8,685	1,648
Deferred Tax Liabilities, Gross	84,212	32,451
Deferred Tax Assets, Operating Loss Carryforwards	202,756	203,958
Deferred Tax Assets Mineral Properties	0	34,966
Deferred Tax Assets, Property, Plant and Equipment	87,978	6,980
Deferred Tax Assets - Mexican Mining Royalty	6,359	0
Deferred Tax Assets, Capital Loss Carryforwards	6,770	3,938
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations	25,255	21,480
Deferred Tax Assets Unrealized Foreign Currency Loss and Other	7,413	8,424
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	17,713	17,905
Tax Credit Carryforwards	31,272	26,439
Deferred Tax Assets, Gross	385,516	324,090
Deferred Tax Assets, Valuation Allowance	(375,911)	(436,829)
Deferred Tax Assets, Net of Valuation Allowance	9,605	(112,739)
Deferred Tax Liabilities, Net	$ 74,607	$ 145,190