Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Long term debt and capital lease obligations
Current	$ 16,801		$ 10,431
Debt	494,300		479,979
Interest expenses incurred for various debt instruments
Interest Paid on Convertible Notes due 2028	6	$ 37
Interest Paid on Senior Notes due 2021	7,457	8,562
Interest paid on term loan due 2020	2,264	0
San Bartolomé Lines of Credit	15	272
Interest Paid on Capital Leases	265	298
Interest Expense, Debt	11	0
Accretion of Franco Nevada royalty obligation	765	2,031
Debt Issuance Cost	631	405
Amortization of debt issuance costs	91	105
Capitalized interest	(203)	(735)
Total interest expense, net of capitalized interest	11,120	$ 10,765
San Bartolome Letter of Credit Facility [Member]
Long term debt and capital lease obligations
Debt	$ 0		4,571
3.25% Convertible Senior Notes due March 2028 [Member]
Long term debt and capital lease obligations
Debt Instrument, Face Amount			$ 712
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%
Senior Notes due 2021 [Member]
Long term debt and capital lease obligations
Debt	$ 373,695
Debt Instrument, Interest Rate, Stated Percentage	7.875%		7.875%
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Debt	$ 26,376		$ 7,774
3.25% Convertible Senior Notes due March 2028 [Member]
Long term debt and capital lease obligations
Current	0		0
Senior Notes due 2021 [Member]
Long term debt and capital lease obligations
Current	0		0
Short Term Credit Agreement [Member]
Long term debt and capital lease obligations
Current	1,000		1,000
Debt	93,517		93,489
San Bartolome Letter of Credit Facility [Member]
Long term debt and capital lease obligations
Current	0		0
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Current	$ 15,801		$ 9,431

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