Debt (Details Textual)							3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) oz	Sep. 09, 2016 shares	Jul. 25, 2016 USD ($)	Jul. 15, 2016 USD ($)	Jun. 23, 2015 USD ($)	Oct. 02, 2014 USD ($)	Sep. 30, 2016 USD ($) Agreements oz shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) debt oz	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Debt Instrument [Line Items]
Number of Agreements | Agreements							2
Debt and capital lease obligations (Textual) [Abstract]
Stock Issued During Period, Shares, New Issues | shares		4,293,785					9,253,016
Loss on extinguishment of debt							$ 10,040,000	$ 0	$ 10,040,000	$ 524,000
Percentage of Actual Gold Production									50.00%
Price per ounce under agreement	$ 416						416		$ 416
Cash payments on gold production royalty							7,563,000	10,159,000	27,155,000	30,281,000
Additional Long term debt and capital lease obligations(Textual) [Abstract]
Accretion of Royalty Obligation							49,000	$ 1,642,000	$ 1,211,000	$ 5,444,000
Convertible Senior Notes Due March 2028 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Debt Instrument, Face Amount											$ 712,000
Banco de Credito Line of Credit [Member]
Debt and capital lease obligations (Textual) [Abstract]
Number of lines of credits, outstanding | debt									2
Borrowing under term facility	$ 27,000,000						$ 27,000,000		$ 27,000,000
Palmarejo gold stream agreement [Member]
Debt and capital lease obligations (Textual) [Abstract]
Termination payment						$ 2,000,000
Price per ounce under agreement						$ 800
Palmarejo gold production royalty [Member]
Debt and capital lease obligations (Textual) [Abstract]
Payment made for gold on the end of royalty obligation | oz	4,167						4,167		4,167
Royalty Obligation, Term	8 years
Annual Inflation Compounding Adjustment	1.00%						1.00%		1.00%
Palmarejo gold production royalty [Member] | Maximum [Member]
Debt and capital lease obligations (Textual) [Abstract]
Payable ounces under royalty obligation | oz	400,000						400,000		400,000
Senior Notes due 2021 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Long-term Debt	$ 10,800,000						$ 10,800,000		$ 10,800,000
Stock Issued During Period, Shares, New Issues | shares							700,000
Loss on extinguishment of debt							$ 1,200,000
Convertible Senior Notes Due March 2028 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Repayments of Convertible Debt			$ 700,000
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	4,400,000						4,400,000		$ 4,400,000		5,300,000
Debt and capital lease obligations (Textual) [Abstract]
Redemption period, low range									30 days
Redemption period, upper range									60 days
Redemption price after initial redemption period (as a percent)									100.00%
Short Term Credit Agreement [Member]
Debt Instrument [Line Items]
Unamortized debt issuance expense											$ 5,000,000
Debt and capital lease obligations (Textual) [Abstract]
Short-term Debt												$ 50,000,000.0
Term Loan due 2020 [Member] | Secured Debt [Member]
Debt and capital lease obligations (Textual) [Abstract]
Debt Instrument, Term					5 years
Long-term Debt					$ 100,000,000
Repayments of Debt				$ 99,000,000
Payments of Debt Extinguishment Costs				4,400,000
Extinguishment of Debt, Amount				103,400,000
Reported Value Measurement [Member] | Convertible Senior Notes Due March 2028 [Member]
Debt and capital lease obligations (Textual) [Abstract]
Debt Instrument, Face Amount	$ 0						$ 0		$ 0
Other Nonoperating Income (Expense) [Member] | Term Loan due 2020 [Member] | Secured Debt [Member]
Debt and capital lease obligations (Textual) [Abstract]
Loss on extinguishment of debt				$ 8,800,000