Derivative Financial Instruments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) oz $ / oz	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) oz $ / oz	Jun. 30, 2015 USD ($)
Derivative [Line Items]
Gain (loss) on derivative instruments	$ (3,579,000)	$ 2,754,000	$ (12,274,000)	$ (2,130,000)
Derivative instruments Settlement
Price per ounce under agreement	416		416
Palmarejo gold production royalty [Member] | 2016 [Member]
Derivative instruments Settlement
Derivative, notional amount	7,487,000		7,487,000
Price per ounce under agreement	$ 882		$ 882
Notional ounces | oz	8,493		8,493
Palmarejo gold production royalty [Member] | Thereafter [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 0		$ 0
Price per ounce under agreement	$ 0		$ 0
Notional ounces | oz	0		0
Silver concentrate sales agreements [Member] | 2016 [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 10,016,000		$ 10,016,000
Derivative average price | $ / oz	18.28		18.28
Outstanding Provisionally Priced Sales Consists of Silver | oz	547,940		547,940
Silver concentrate sales agreements [Member] | Thereafter [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 0		$ 0
Derivative average price | $ / oz	0		0
Notional ounces | oz	0		0
Gold concentrates sales agreements [Member] | 2016 [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 43,839,000		$ 43,839,000
Derivative average price | $ / oz	1,257		1,257
Outstanding Provisionally Priced Sales Consists of Gold | oz	34,876		34,876
Gold concentrates sales agreements [Member] | Thereafter [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 0		$ 0
Derivative average price | $ / oz	0		0
Notional ounces | oz	0		0