Derivative Financial Instruments (Details Textual)	3 Months Ended	12 Months Ended					12 Months Ended									3 Months Ended	12 Months Ended			12 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2013 USD ($) oz	Dec. 31, 2013 USD ($) oz	Dec. 31, 2012 USD ($) oz	Dec. 31, 2013 MXN	Sep. 30, 2012 oz	Dec. 31, 2013 Put Option [Member]	Dec. 31, 2013 Cerro Bayo Mine [Member] USD ($) delivery oz	Dec. 31, 2012 Cerro Bayo Mine [Member] USD ($)	Dec. 31, 2013 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2012 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2011 Franco-Nevada warrant [Member] USD ($)	Dec. 31, 2012 Gold lease forward purchase contracts [Member] USD ($)	Dec. 31, 2013 Forward Gold Contract [Member] USD ($) oz	Dec. 31, 2013 Palmarejo gold production royalty [Member] oz	Jan. 21, 2009 Palmarejo gold production royalty [Member]	Dec. 31, 2013 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, 2011 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2012 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Dec. 31, 2012 Commodity [Member] USD ($)	Dec. 31, 2011 Commodity [Member] USD ($)	Dec. 31, 2013 Commodity [Member] USD ($)	Dec. 31, 2012 Commodity [Member] Call Option [Member] oz	Mar. 31, 2012 Kensington Term Facility [Member] USD ($)	Dec. 31, 2013 Kensington Term Facility [Member] USD ($)	Dec. 31, 2012 Kensington Term Facility [Member] USD ($)	Dec. 31, 2011 Kensington Term Facility [Member] USD ($)	Dec. 31, 2013 Kensington Term Facility [Member] Put Option [Member] USD ($)	Dec. 31, 2012 Kensington Term Facility [Member] Put Option [Member] oz	Dec. 31, 2013 Maximum [Member] Palmarejo gold production royalty [Member] oz	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Mexican peso forward purchase contracts [Member] oz	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Gold call options sold [Member] oz	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Gold put options purchased [Member] oz	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Silver put options purchased [Member] oz	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2013 Derivative Instruments Settle in Year One [Member] Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Dec. 31, 2013 Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2012 Prepaid Expenses and Other Current Assets [Member] USD ($)	Dec. 31, 2013 Prepaid Expenses and Other Current Assets [Member] Palmarejo gold production royalty [Member] USD ($)	Dec. 31, 2012 Prepaid Expenses and Other Current Assets [Member] Palmarejo gold production royalty [Member] USD ($)	Dec. 31, 2013 Prepaid Expenses and Other Current Assets [Member] Forward foreign exchange contracts [Member] USD ($)	Dec. 31, 2012 Prepaid Expenses and Other Current Assets [Member] Forward foreign exchange contracts [Member] USD ($)	Dec. 31, 2013 Prepaid Expenses and Other Current Assets [Member] Gold Put Purchase and Call Sold Options Net [Member] USD ($)	Dec. 31, 2012 Prepaid Expenses and Other Current Assets [Member] Gold Put Purchase and Call Sold Options Net [Member] USD ($)
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, Ounces of Gold																														400,000
Total gold remain outstanding														140,931
Fair Value Assumptions, Risk Free Interest Rate		5.70%	4.20%
Fair value liability of the embedded derivative									$ 40,300,000	$ 145,100,000
Company recognized Mark to Market loss									104,800,000	14,300,000	0
Percentage of Gold Production														50.00%
Annual Inflation Compounding Adjustment														1.00%
Realized losses									28,700,000	45,400,000	0	2,300,000
Foreign exchange contracts of MXP																	26,100,000																		12,000,000
Weighted average exchange rate of MXP				14.80															13.11																	12.21
Fair value of foreign exchange contracts																(900,000)	(100)
Weighted Average Strike Price of Put Options				12.60
Notional Amount of Foreign Currency Derivatives																45,000,000
Mark-to-market gains and losses on forward foreign exchange contract	400,000												500,000			1,000,000	3,300,000	3,200,000
Mark-to-market Realized gains on forward foreign exchange contract																600,000	0	0
Derivative Liability, Fair Value																						9,300,000
Weighted Average Call Feature of Each Collar																								1,968	1,968	97,000		17.00
Outstanding Put Options of Gold	97,000																												122,000
Fair Value, Asian Put Options																																											100,000
Outstanding Call Options of Gold					84,500																		97,000
Weighted Average Put Feature of Each Collar																										968	968	1,150
Contract expiration date						3 years
Notional ounces													10,000																		146,460	1,250,000	25,000	1,250,000
Derivative swap fixed price (in usd per oz)													1,380
Average strike price																																17.00	1,150
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
Company recognized mark to market gain							600,000	800,000
Fair value of the contract		135,000																																			184,000	1,406,000			38,000	376,000	135,000
Derivative Financial Instruments and Fair Value of Financial Instruments (Textual) [Abstract]
Outstanding provisionally priced sales consists of silver		200,000	400,000
Outstanding provisionally priced sales consists of Gold		30,780	11,957
Fair value of gold and silver including embedded derivative		42,400,000
Outstanding provisionally priced sales			$ 33,200,000