Derivative Financial Instruments (Details)	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Palmarejo gold production royalty [Member] 2013 [Member] USD ($) oz	Dec. 31, 2014 Palmarejo gold production royalty [Member] 2014 [Member] USD ($) oz	Dec. 31, 2014 Palmarejo gold production royalty [Member] Thereafter [Member] USD ($) oz	Dec. 31, 2014 Silver concentrate sales agreements [Member] 2013 [Member] USD ($) oz	Dec. 31, 2014 Silver concentrate sales agreements [Member] 2014 [Member] USD ($) oz	Dec. 31, 2014 Silver concentrate sales agreements [Member] Thereafter [Member] USD ($) oz	Dec. 31, 2014 Gold concentrates sales agreements [Member] 2013 [Member] USD ($) oz	Dec. 31, 2014 Gold concentrates sales agreements [Member] 2014 [Member] USD ($) oz	Dec. 31, 2014 Gold concentrates sales agreements [Member] Thereafter [Member] USD ($) oz	Dec. 31, 2014 Gold put options purchased [Member] 2013 [Member] USD ($) oz	Dec. 31, 2014 Gold put options purchased [Member] 2014 [Member] USD ($) oz	Dec. 31, 2014 Gold put options purchased [Member] Thereafter [Member] USD ($) oz	Dec. 31, 2014 Gold Put Option [Member] 2013 [Member] USD ($)	Dec. 31, 2014 Gold Put Option [Member] 2014 [Member] USD ($)	Dec. 31, 2014 Gold Put Option [Member] Thereafter [Member] USD ($)	Dec. 31, 2014 Silver put options purchased [Member] 2013 [Member] USD ($) oz	Dec. 31, 2014 Silver put options purchased [Member] 2014 [Member] USD ($) oz	Dec. 31, 2014 Silver put options purchased [Member] Thereafter [Member] USD ($) oz	Dec. 31, 2014 Silver Put Options Sold [Member] 2013 [Member] USD ($)	Dec. 31, 2014 Silver Put Options Sold [Member] 2014 [Member] USD ($)	Dec. 31, 2014 Silver Put Options Sold [Member] Thereafter [Member] USD ($)	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	Dec. 31, 2014 Line of Credit [Member] Gold put options purchased [Member] 2013 [Member]
Derivative [Line Items]
Gain (loss) on derivative instruments	$ 3,618,000	$ 82,768,000	$ (23,487,000)
Derivative instruments Settlement
Derivative, notional amount				41,981,000	23,779,000	0	10,392,000	0	0	35,576,000	0	0	14,400,000	0	0	12,600,000	0	0	11,250,000	0	0	10,000,000	0	0	45,000,000
Derivative average gold price in excess of minimum contractual Deduction Rate	408			775	774	0
Notional ounces				54,171	30,744	0		0	0		0	0	12,000	0	0				625,000	0	0
Foreign exchange contracts of MXP																									$ 12,000,000
Average rate (MXP/$)																										14.80
Derivative average price							16.35	0	0	1,221	0	0
Outstanding Provisionally Priced Sales Consists of Gold										29,137
Outstanding Provisionally Priced Sales Consists of Silver							635,614
Average strike price														0	0	1,050	0	0	18.00	0.00	0	16.00	0.00	0			1,200