Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Costs applicable to sales	[1]	$ 409,541	$ 479,654	$ 477,945
Fair value adjustments, net		(11,581)	5,202	3,618
Fair value adjustments, net		(7,702)	4,680	(158)
Concentrate Sales Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		(254)	296	(123)
Embedded Derivative Financial Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net		(5,866)	3,101	(2,001)
Silver and gold options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		0		1,500
Fair value adjustments, net			1,300	600
Derivative, Gain (Loss) on Derivative, Net		(1,582)	1,283	1,058
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Costs applicable to sales		0	0	924
Fair value adjustments, net		0	0	908
Mexican peso forward purchase contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value adjustments, net		$ 0	$ 0	$ (16)

[1] Excludes amortization.