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Debt (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Long term debt and capital lease obligations
Current	$ 108,809		$ 108,809		$ 10,431
Debt	402,257		402,257		479,979
Interest expenses incurred for various debt instruments
Interest Paid on Convertible Notes due 2028	6	$ 6	12	$ 43
Interest Paid on Senior Notes due 2021	7,457	8,523	14,913	17,085
Interest paid on short-term credit agreement	0	326	0	326
Interest paid on term loan due 2020	2,258	148	4,521	148
San Bartolomé Lines of Credit	0	293	15	565
Interest Paid on Capital Leases	416	272	680	570
Interest Expense, Debt	15	0	29	0
Accretion of Franco Nevada royalty obligation	397	1,771	1,162	3,802
Debt Issuance Cost	631	508	1,262	913
Amortization of debt issuance costs	91	104	182	209
Capitalized interest	(214)	(1,009)	(417)	(1,744)
Total interest expense, net of capitalized interest	10,875	$ 10,734	21,995	$ 21,499
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	$ 373,957		$ 373,957
Debt Instrument, Interest Rate, Stated Percentage	7.875%		7.875%		7.875%
Capital Lease Obligations [Member]
Long term debt and capital lease obligations
Debt	$ 28,300		$ 28,300		$ 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	94,545		94,545		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	$ 13,552		$ 13,552		$ 9,431