Derivative Financial Instruments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 Palmarejo gold production royalty [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Palmarejo gold production royalty [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Palmarejo gold production royalty [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Palmarejo gold production royalty [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Mexico Peso Put Options [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Mexico Peso Put Options [Member] 2014 [Member] MXN	Jun. 30, 2014 Mexico Peso Put Options [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Mexico Peso Put Options [Member] 2015 [Member] MXN	Jun. 30, 2014 Mexico Peso Put Options [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Mexico Peso Put Options [Member] Thereafter [Member] MXN	Jun. 30, 2014 Mexico peso call options [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Mexico peso call options [Member] 2014 [Member] MXN	Jun. 30, 2014 Mexico peso call options [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Mexico peso call options [Member] 2015 [Member] MXN	Jun. 30, 2014 Mexico peso call options [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Mexico peso call options [Member] Thereafter [Member] MXN	Jun. 30, 2014 Silver concentrate sales agreements [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Silver concentrate sales agreements [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Silver concentrate sales agreements [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Silver concentrate sales agreements [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Gold concentrates sales agreements [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Gold concentrates sales agreements [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Gold concentrates sales agreements [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Gold concentrates sales agreements [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Gold put options purchased [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Gold put options purchased [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Gold put options purchased [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Gold put options purchased [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Gold Put Option [Member] 2013 [Member] USD ($)	Jun. 30, 2014 Gold Put Option [Member] 2014 [Member] USD ($)	Jun. 30, 2014 Gold Put Option [Member] 2015 [Member] USD ($)	Jun. 30, 2014 Gold Put Option [Member] Thereafter [Member] USD ($)	Jun. 30, 2014 Silver put options purchased [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Silver put options purchased [Member] 2014 [Member] USD ($) oz	Jun. 30, 2014 Silver put options purchased [Member] 2015 [Member] USD ($) oz	Jun. 30, 2014 Silver put options purchased [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2014 Silver Put Options Sold [Member] 2013 [Member] USD ($)	Jun. 30, 2014 Silver Put Options Sold [Member] 2014 [Member] USD ($)	Jun. 30, 2014 Silver Put Options Sold [Member] 2015 [Member] USD ($)	Jun. 30, 2014 Silver Put Options Sold [Member] Thereafter [Member] USD ($)	Dec. 31, 2013 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2013 Forward foreign exchange contracts [Member] Mexican peso forward purchase contracts [Member] MXN	Jun. 30, 2014 Mexico peso call options [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Mexico peso call options [Member] 2013 [Member] MXN	Jun. 30, 2014 Mexico Peso Put Options [Member] 2013 [Member] USD ($) oz	Jun. 30, 2014 Mexico Peso Put Options [Member] 2013 [Member] MXN	Jun. 30, 2014 Line of Credit [Member] Gold put options purchased [Member] 2013 [Member]
Derivative [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ (8,282,000)	$ 66,754,000	$ (19,717,000)	$ 84,550,000
Derivative instruments Settlement
Derivative, notional amount					27,334,000	46,078,000	27,741,000	0													3,253,000	0	0	0	14,865,000	0	0	0	60,000,000	28,800,000	0	0	52,500,000	25,200,000	0	0	45,000,000	22,500,000	0	0	40,000,000	20,000,000	0	0	45,000,000
Derivative average gold price in excess of minimum contractual Deduction Rate	408		408		913	919	920	0
Notional ounces					29,920	50,153	30,168	0	0	0	0	0	0	0	0	0	0	0	0	0		0	0	0		0	0	0	50,000	24,000	0	0					2,500,000	1,250,000	0	0							289,800,000	289,800,000	344,310,000	344,310,000
Foreign exchange contracts of MXP																																													12,000,000		23,000,000		23,000,000
Fair value of foreign exchange contracts									$ 0		$ 0		$ 0		$ 0		$ 0		$ 0
Average rate (MXP/$)										0		0		0		0		0		0																										14.80		12.60		14.97
Derivative average price																					19.99	0	0	0	1,286	0	0	0
Outstanding Provisionally Priced Sales Consists of Gold																									11,559
Outstanding Provisionally Priced Sales Consists of Silver																					162,724
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