Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net income	$ 14,211	$ 132,595
Non-cash elements included in net income:
Depreciation, depletion and amortization	36,042	34,769
Gain on sale of investments		(611)
Loss on disposition of properties, plants, equipment, and mineral interests	359
Provision for reclamation and closure costs	3,937	832
Stock compensation	2,296	1,497
Deferred income taxes	(2,023)	60,790
Amortization of loan origination fees	324	498
(Gain) loss on derivative contracts	24,748	(56,512)
Other non-cash charges, net	901	932
Change in assets and liabilities:
Accounts receivable	(9,508)	7,745
Inventories	1,025	(6,608)
Other current and non-current assets	(417)	373
Accounts payable and accrued liabilities	4,561	17,233
Accrued payroll and related benefits	(2,754)	581
Accrued taxes	(611)	(6,276)
Accrued reclamation and closure costs and other non-current liabilities	(6,603)	100
Cash provided by operating activities	66,488	187,938
Investing activities:
Additions to properties, plants, equipment and mineral interests	(81,318)	(64,381)
Proceeds from sale of investments		1,366
Proceeds from disposition of properties, plants and equipment	744	113
Purchases of investments	(3,261)	(3,200)
Changes in restricted cash and investment balances		9,388
Net cash used in investing activities	(83,835)	(56,714)
Financing activities:
Proceeds from exercise of stock options and warrants		5,108
Acquisition of treasury shares	(497)	(469)
Dividends paid to common shareholders	(10,700)
Dividends paid to preferred shareholders	(414)	(3,684)
Repayments of capital leases	(4,561)	(2,042)
Loan origination fees	(750)
Net cash used in financing activities	(16,922)	(1,087)
Change in cash and cash equivalents:
Net increase (decrease) in cash and cash equivalents	(34,269)	130,137
Cash and cash equivalents at beginning of period	266,463	283,606
Cash and cash equivalents at end of period	232,194	413,743
Significant non-cash investing and financing activities:
Addition of capital lease obligations	9,108	3,353
Accounts payable change relating to capital additions	$ (2,905)	$ 6,721