Derivative Financial Instruments and Fair Value of Financial Instruments (Details)	3 Months Ended	12 Months Ended										3 Months Ended		6 Months Ended																																															3 Months Ended			6 Months Ended
	Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 MXN	Jun. 30, 2013 2013 [Member]	Jun. 30, 2013 2013 [Member] MXN	Jun. 30, 2013 2014 [Member]	Jun. 30, 2013 2014 [Member] MXN	Jun. 30, 2013 Derivative Instruments Settle in Year 2014 Member [Member]	Jun. 30, 2013 Derivative Instruments Settle in Year 2014 Member [Member] MXN	Jun. 30, 2013 Thereafter [Member]	Jun. 30, 2013 Thereafter [Member] MXN	Jun. 30, 2013 Franco-Nevada warrant [Member] USD ($)	Mar. 31, 2012 Franco-Nevada warrant [Member] USD ($)	Jun. 30, 2013 Franco-Nevada warrant [Member] USD ($)	Jun. 30, 2012 Franco-Nevada warrant [Member] USD ($)	Jun. 30, 2013 Palmarejo gold production royalty [Member] 2013 [Member] USD ($) oz	Jun. 30, 2013 Palmarejo gold production royalty [Member] 2014 [Member] USD ($) oz	Jun. 30, 2013 Palmarejo gold production royalty [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($) oz	Jun. 30, 2013 Palmarejo gold production royalty [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2013 Mexican peso forward purchase contracts [Member] 2013 [Member] USD ($)	Jun. 30, 2013 Mexican peso forward purchase contracts [Member] 2014 [Member] USD ($)	Jun. 30, 2013 Mexican peso forward purchase contracts [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($)	Jun. 30, 2013 Mexican peso forward purchase contracts [Member] Thereafter [Member] USD ($)	Jun. 30, 2013 Mexican Peso Notional Amount [Member] 2013 [Member] MXN	Jun. 30, 2013 Mexican Peso Notional Amount [Member] 2014 [Member] MXN	Jun. 30, 2013 Mexican Peso Notional Amount [Member] Derivative Instruments Settle in Year 2014 Member [Member] MXN	Jun. 30, 2013 Mexican Peso Notional Amount [Member] Thereafter [Member] MXN	Jun. 30, 2013 Silver ounces received from Mandalay [Member] 2013 [Member] USD ($)	Jun. 30, 2013 Silver ounces received from Mandalay [Member] 2013 [Member] MXN	Jun. 30, 2013 Silver ounces received from Mandalay [Member] 2014 [Member] USD ($)	Jun. 30, 2013 Silver ounces received from Mandalay [Member] 2014 [Member] MXN	Jun. 30, 2013 Silver ounces received from Mandalay [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($)	Jun. 30, 2013 Silver ounces received from Mandalay [Member] Derivative Instruments Settle in Year 2014 Member [Member] MXN	Jun. 30, 2013 Silver ounces received from Mandalay [Member] Thereafter [Member] USD ($)	Jun. 30, 2013 Silver ounces received from Mandalay [Member] Thereafter [Member] MXN	Jun. 30, 2013 Mexico Peso Call Options [Member] 2013 [Member] USD ($)	Jun. 30, 2013 Mexico Peso Call Options [Member] 2013 [Member] MXN	Jun. 30, 2013 Mexico Peso Call Options [Member] 2014 [Member] USD ($)	Jun. 30, 2013 Mexico Peso Call Options [Member] 2014 [Member] MXN	Jun. 30, 2013 Mexico Peso Call Options [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($)	Jun. 30, 2013 Mexico Peso Call Options [Member] Derivative Instruments Settle in Year 2014 Member [Member] MXN	Jun. 30, 2013 Mexico Peso Call Options [Member] Thereafter [Member] USD ($)	Jun. 30, 2013 Mexico Peso Call Options [Member] Thereafter [Member] MXN	Jun. 30, 2013 Silver concentrate sales agreements [Member] 2013 [Member] USD ($) oz	Jun. 30, 2013 Silver concentrate sales agreements [Member] 2014 [Member] USD ($) oz	Jun. 30, 2013 Silver concentrate sales agreements [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($) oz	Jun. 30, 2013 Silver concentrate sales agreements [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2013 Gold concentrates sales agreements [Member] 2013 [Member] USD ($) oz	Jun. 30, 2013 Gold concentrates sales agreements [Member] 2014 [Member] USD ($) oz	Jun. 30, 2013 Gold concentrates sales agreements [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($) oz	Jun. 30, 2013 Gold concentrates sales agreements [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2013 Gold put options purchased [Member] 2013 [Member] USD ($) oz	Jun. 30, 2013 Gold put options purchased [Member] 2014 [Member] USD ($) oz	Jun. 30, 2013 Gold put options purchased [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($) oz	Jun. 30, 2013 Gold put options purchased [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2013 Gold call options sold [Member]	Jun. 30, 2013 Gold call options sold [Member] 2013 [Member] USD ($) oz	Jun. 30, 2013 Gold call options sold [Member] 2014 [Member] USD ($) oz	Jun. 30, 2013 Gold call options sold [Member] Derivative Instruments Settle in Year 2014 Member [Member] USD ($) oz	Jun. 30, 2013 Gold call options sold [Member] Thereafter [Member] USD ($) oz	Jun. 30, 2013 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)	Mar. 31, 2012 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)	Jun. 30, 2013 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)	Jun. 30, 2012 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)	Dec. 31, 2012 Foreign Exchange Forward [Member] Mexican peso forward purchase contracts [Member] USD ($)
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net																																																													$ 0	$ 100,000	$ 0		$ 2,800,000
Derivative Instruments, Loss Recognized in Income												8,100,000	11,000,000	17,200,000	24,200,000
Derivative instruments Settlement
Derivative, Notional Amount																14,750,000	24,895,000	24,691,000	20,069,000					267,119	146,460,000	0	0	0	0	6,000,000	75,000	0	0	0	0		0		93,000,000		0		0	7,249,000	0	0	0	22,252,000	0	0	0	720,000	720,000	0	0		0	720,000	0	0
Derivative average gold price in excess of minimum contractual Deduction Rate	400															502,000	498,000	492,000	490,000
Notional ounces																29,389	50,004	50,004	40,985																									302,990	0	0	0	15,589	0	0	0	20,000	47,000	30,000	0		10,000	47,000	30,000	0
Fair value of foreign exchange contracts																				20,700,000	12,000,000	0	0
Average rate			13.11		12.90		12.21		0.00		0																		0.00		12.50		0		0		0		15,500		0		0
Notional amount of foreign currency derivatives	6,000																																			0		6,000,000		0		0																			32,700,000			32,700,000		0
Average strike price				2,000	2,000	1,934	1,934	2,000	2,000	0	0																																									936	979	1,010	0	2,000.00
Derivative average price																												23.92	23.92	0	0	0	0	0	0													1,427	0	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Net																																																													200,000		1,200,000	800,000	1,900,000
Weighted Average Put Feature of Each Collar	$ 979.79	$ 967.86