Derivative Financial Instruments (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 Palmarejo gold production royalty [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Palmarejo gold production royalty [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Palmarejo gold production royalty [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Palmarejo gold production royalty [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Mexico Peso Put Options [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Mexico Peso Put Options [Member] 2014 [Member] MXN	Sep. 30, 2014 Mexico Peso Put Options [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Mexico Peso Put Options [Member] 2015 [Member] MXN	Sep. 30, 2014 Mexico Peso Put Options [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Mexico Peso Put Options [Member] Thereafter [Member] MXN	Sep. 30, 2014 Mexico peso call options [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Mexico peso call options [Member] 2014 [Member] MXN	Sep. 30, 2014 Mexico peso call options [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Mexico peso call options [Member] 2015 [Member] MXN	Sep. 30, 2014 Mexico peso call options [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Mexico peso call options [Member] Thereafter [Member] MXN	Sep. 30, 2014 Silver concentrate sales agreements [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Silver concentrate sales agreements [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Silver concentrate sales agreements [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Silver concentrate sales agreements [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Gold concentrates sales agreements [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Gold concentrates sales agreements [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Gold concentrates sales agreements [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Gold concentrates sales agreements [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Gold put options purchased [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Gold put options purchased [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Gold put options purchased [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Gold put options purchased [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Gold Put Option [Member] 2013 [Member] USD ($)	Sep. 30, 2014 Gold Put Option [Member] 2014 [Member] USD ($)	Sep. 30, 2014 Gold Put Option [Member] 2015 [Member] USD ($)	Sep. 30, 2014 Gold Put Option [Member] Thereafter [Member] USD ($)	Sep. 30, 2014 Silver put options purchased [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Silver put options purchased [Member] 2014 [Member] USD ($) oz	Sep. 30, 2014 Silver put options purchased [Member] 2015 [Member] USD ($) oz	Sep. 30, 2014 Silver put options purchased [Member] Thereafter [Member] USD ($) oz	Sep. 30, 2014 Silver Put Options Sold [Member] 2013 [Member] USD ($)	Sep. 30, 2014 Silver Put Options Sold [Member] 2014 [Member] USD ($)	Sep. 30, 2014 Silver Put Options Sold [Member] 2015 [Member] USD ($)	Sep. 30, 2014 Silver Put Options Sold [Member] Thereafter [Member] USD ($)	Dec. 31, 2013 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2013 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Sep. 30, 2014 Mexico peso call options [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Mexico peso call options [Member] 2013 [Member] MXN	Sep. 30, 2014 Mexico Peso Put Options [Member] 2013 [Member] USD ($) oz	Sep. 30, 2014 Mexico Peso Put Options [Member] 2013 [Member] MXN	Sep. 30, 2014 Line of Credit [Member] Gold put options purchased [Member] 2013 [Member]
Derivative [Line Items]
Gain (loss) on derivative instruments	$ 16,105,000	$ (20,646,000)	$ (3,611,000)	$ 63,905,000
Derivative instruments Settlement
Derivative, notional amount					13,571,000	40,516,000	24,778,000	0													2,360,000	0	0	0	41,197,000	0	0	0	30,000,000	28,800,000	0	0	26,250,000	25,200,000	0	0	22,500,000	22,500,000	0	0	20,000,000	20,000,000	0	0	45,000,000
Derivative average gold price in excess of minimum contractual Deduction Rate	408		408		814	808	810	0
Notional ounces					16,668	50,153	30,595	0	0	0	0	0	0	0	0	0	0	0	0	0		0	0	0		0	0	0	25,000	24,000	0	0					1,250,000	1,250,000	0	0							189,750,000	189,750,000	222,450,000	222,450,000
Foreign exchange contracts of MXP																																													12,000,000		15,000,000		15,000,000
Fair value of foreign exchange contracts									$ 0		$ 0		$ 0		$ 0		$ 0		$ 0
Average rate (MXP/$)										0		0		0		0		0		0																										14.80		12.65		14.83
Derivative average price																					18.87	0	0	0	1,253	0	0	0
Outstanding Provisionally Priced Sales Consists of Gold																									32,879
Outstanding Provisionally Priced Sales Consists of Silver																					125,078
Average strike price																														1,200	0	0	1,050	1,050	0	0	18.00	18.00	0	0	16.00	16.00	0	0							1,200