Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES:
Net loss	$ (10,215)	$ (2,502)	$ (14,605)
Reconciliation of net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	98,926	71,466	98,775
Amortization of loan acquisition cost	895	1,563	1,228
Loss on extinguishment of debt	568	0	0
Gain on sale of assets	(31,577)	(1,350)	(1,172)
Non-cash employee compensation	6,111	3,385	2,975
Deferred income tax expense	16,816	8,315	3,374
Fair value of derivatives loss	162	(177)	(215)
Fair value loss/(gain) on convertible debt	27,985	(26,154)	3,208
Accretion of asset retirement obligations	2,816	3,845	2,803
Reclamation expenditures	(6,203)	(26,895)	(9,705)
Changes in working capital	(11,994)	(7,853)	9,950
Net cash provided by operating activities	94,290	23,643	96,616
INVESTING ACTIVITIES:
Expenditures on mining properties	(43,382)	(50,027)	(34,342)
Expenditures on property, plant and equipment	(45,113)	(51,353)	(30,849)
Change in accounts payable and deposits on mine equipment and material	4,559	1,907	901
Proceeds from sale of investments	15,616	0	0
Other	(734)	1,916	2,740
Net cash used in investing activities	(69,054)	(97,557)	(61,550)
FINANCING ACTIVITIES:
Principal payments on debt	(58,806)	(10,397)	(38,049)
Proceeds from debt agreements and equipment financing	8,510	9,875	25,674
Issuance of share capital, net of issuance costs	300	282	2,248
Other	0	(220)	(1,010)
Net cash used in financing activities	(49,996)	(460)	(11,137)
Increase/(decrease) in cash and cash equivalents	(24,760)	(74,374)	23,929
Cash and cash equivalents, beginning of period	103,644	178,018	154,089
Cash and cash equivalents, end of period	$ 78,884	$ 103,644	$ 178,018