Derivative Financial Instruments (Details Textual)	12 Months Ended			12 Months Ended								12 Months Ended		12 Months Ended				3 Months Ended	12 Months Ended		15 Months Ended				12 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended				12 Months Ended		12 Months Ended
	Dec. 31, 2012 USD ($) oz	Dec. 31, 2011 USD ($) oz	Dec. 31, 2012 Put Option [Member]	Dec. 31, 2012 Cerro Bayo Mine [Member] USD ($) oz delivery	Dec. 31, 2011 Cerro Bayo Mine [Member] USD ($)	Dec. 31, 2012 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2011 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2010 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2011 Gold lease forward purchase contracts [Member] USD ($)	Dec. 31, 2010 Gold lease forward purchase contracts [Member] USD ($)	Dec. 31, 2012 Gold call options sold [Member]	Dec. 31, 2012 Gold Call Options Expired [Member] USD ($) oz	Dec. 31, 2012 Gold put options expired [Member] [Member] oz	Dec. 31, 2012 Gold Call Options Settled [Member] USD ($) oz	Dec. 31, 2012 Palmarejo gold production royalty [Member] oz	Dec. 31, 2011 Palmarejo gold production royalty [Member]	Jan. 21, 2009 Palmarejo gold production royalty [Member]	Dec. 31, 2012 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2011 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2010 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2012 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2012 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Dec. 31, 2011 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Dec. 31, 2012 Silver [Member] Cerro Bayo Mine [Member] USD ($)	Dec. 31, 2011 Commodity [Member] USD ($)	Dec. 31, 2010 Commodity [Member] USD ($) oz	Dec. 31, 2012 Commodity [Member] USD ($)	Dec. 31, 2011 Forward Contracts [Member] USD ($) oz	Dec. 31, 2012 Kensington Term Facility [Member] USD ($)	Dec. 31, 2011 Kensington Term Facility [Member] USD ($)	Dec. 31, 2011 Kensington Term Facility [Member] USD ($)	Dec. 31, 2012 Kensington Term Facility [Member] Call Option [Member] oz	Dec. 31, 2011 Kensington Term Facility [Member] Call Option [Member] oz	Dec. 31, 2012 Kensington Term Facility [Member] Put Option [Member] USD ($) oz	Dec. 31, 2011 Kensington Term Facility [Member] Put Option [Member] oz	Dec. 31, 2012 Kensington Term Facility [Member] Gold Call Options Expired [Member] USD ($)	Dec. 31, 2012 Maximum [Member] Palmarejo gold production royalty [Member] oz
Additional Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]
Life of Mine Production, Percentage																	50.00%
Payment made for gold on the end of royalty obligation															4,167
Royalty Guarantees, Commitments, Amount																																					400,000
Total gold remain outstanding															197,352
Fair Value Assumptions, Risk Free Interest Rate	4.19%	5.70%
Derivative, Average Forward Price		1,380													1,694	1,599
Fair value liability of the embedded derivative						$ 145,100,000	$ 159,400,000
Company recognized Mark to Market loss						14,300,000	2,600,000	0
Percentage of Gold Production															50.00%
Derivative Average Gold Price in Excess of Minimum Contractual Deduction Rate	400
Annual Inflation Compounding Adjustment															1.00%
Realized losses						45,400,000	42,800,000	0	2,300,000	10,100,000		2,900,000		1,600,000												0
Foreign exchange contracts of MXP																		26,100,000	25,500,000		26,100,000
Weighted average exchange rate of MXP																						13.11	12.40
Fair value of foreign exchange contracts		21,700,000																100,000	(3,200,000)		100,000
Mark-to-market gains and losses on forward foreign exchange contract																		3,300,000		1,300,000	3,200,000
Mark-to-market Realized gains on forward foreign exchange contract																		(1,600,000)	0	0
Derivative fair value of derivative liability																									9,300,000		17,900,000
Company outstanding provisionally priced sales		22,500,000																						33,200,000
Gold under collars protection																																97,000	136,000	122,000	190,000
Weighted Average Call Feature of Each Collar																													1,967.89	1,919.83	1,919.83
Weighted Average Put Feature of Each Collar																														951.93	951.93			967.86		923.34
Contract expiration date			3 years
Notional ounces												14,000	68,000	25,000														10,000
Outstanding Put Options of Silver																										0
Average Strike Price of Put Option Expired Per Ounce																										9.21
Average strike price											2,000.00
Unrealized gain (loss)	0																								0	0
Received silver in connection with sales of asset				125,000
Number of Equal Quarterly Installments to be Delivered				6
Realized gains																												0.5
Company recognized mark to market gain				600,000	800,000
Fair value of the contract	943,000				2,300,000
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]
Outstanding provisionally priced sales consists of silver	400,000	200,000
Outstanding provisionally priced sales consists of Gold	11,957	9,701
Fair value of gold and silver including embedded derivative	34,100	21,700,000
Outstanding provisionally priced sales		$ 22,500,000