Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Costs applicable to sales	[1]	$ 479,654	$ 477,945	$ 463,663
Fair value adjustments, net		5,202	3,618	82,768
Fair value adjustments, net		4,680	(158)	80,928
Concentrate Sales Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		296	(123)	(1,995)
Forward foreign exchange contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Costs applicable to sales		0	924	589
Fair value adjustments, net		0	908	(967)
Mexican peso forward purchase contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net		0	(16)	(985)
Embedded Derivative Financial Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net		3,101	(2,001)	76,200
Silver and gold options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives			1,500	8,900
Fair value adjustments, net		$ 1,283	$ 1,058	$ 7,119

[1] Excludes amortization.