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Debt (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Long term debt and capital lease obligations
Current	$ 12,512		$ 12,512		$ 10,431
Debt	389,233		389,233		479,979
Interest expenses incurred for various debt instruments
Interest Paid on Convertible Notes due 2028	2	$ 6	13	$ 49
Interest Paid on Senior Notes due 2021	7,337	8,523	22,250	25,608
Interest paid on short-term credit agreement	0	0	0	326
Interest paid on term loan due 2020	417	2,277	4,939	2,425
San Bartolomé Lines of Credit	0	101	15	665
Interest Paid on Capital Leases	399	229	1,079	799
Interest Expense, Debt	38	8	67	8
Accretion of Franco Nevada royalty obligation	49	1,642	1,211	5,444
Debt Issuance Cost	388	690	1,650	1,604
Amortization of debt issuance costs	90	104	272	313
Capitalized interest	(472)	(926)	(889)	(2,670)
Total interest expense, net of capitalized interest	8,068	$ 12,446	30,063	$ 33,945
San Bartolome Letter of Credit Facility [Member]
Long term debt and capital lease obligations
Debt	$ 0		$ 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%		3.25%
Senior Notes due 2021 [Member]
Long term debt and capital lease obligations
Debt	$ 363,596		$ 363,596
Debt Instrument, Interest Rate, Stated Percentage	7.875%		7.875%		7.875%
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Debt	$ 25,637		$ 25,637		$ 7,774
3.25% Convertible Senior Notes due March 2028 [Member]
Long term debt and capital lease obligations
Current					0
Senior Notes due 2021 [Member]
Long term debt and capital lease obligations
Current	0		0		0
Short Term Credit Agreement [Member]
Long term debt and capital lease obligations
Current	0		0		1,000
Debt	0		0		93,489
San Bartolome Letter of Credit Facility [Member]
Long term debt and capital lease obligations
Current	0		0		0
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Current	$ 12,512		$ 12,512		$ 9,431