Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 132,595	$ 58,719
Non-cash elements included in net income:
Depreciation, depletion and amortization	34,769	46,190
Gain on sale of investments	(611)	(588)
Loss on impairment of investments		739
Provision for reclamation and closure costs	832	2,784
Stock compensation	1,497	3,336
Deferred income taxes	60,790	2,070
Amortization of loan origination fees	498	468
(Gain) loss on derivative contracts	(56,512)	11,586
Other non-cash charges, net	932	690
Change in assets and liabilities:
Accounts receivable	7,745	(22,385)
Inventories	(6,608)	512
Other current and non-current assets	373	1,026
Accounts payable and accrued liabilities	17,233	16,537
Accrued payroll and related benefits	581	(5,207)
Accrued taxes	(6,276)	4,367
Accrued reclamation and closure costs and other non-current liabilities	100	(5,371)
Cash provided by operating activities	187,938	115,473
Investing activities:
Additions to properties, plants, equipment and mineral interests	(64,381)	(48,725)
Proceeds from sale of investments	1,366	1,138
Proceeds from disposition of properties, plants and equipment	113
Purchases of investments	(3,200)
Changes in restricted cash and investment balances	9,388	1,476
Net cash used in investing activities	(56,714)	(46,111)
Financing activities:
Proceeds from exercise of stock options and warrants	5,108	45,562
Acquisition of treasury shares	(469)	(693)
Dividends paid to preferred shareholders	(3,684)	(1,105)
Repayments of capital leases	(2,042)	(1,227)
Net cash (used) provided by financing activities	(1,087)	42,537
Change in cash and cash equivalents:
Net increase in cash and cash equivalents	130,137	111,899
Cash and cash equivalents at beginning of period	283,606	104,678
Cash and cash equivalents at end of period	413,743	216,577
Significant non-cash investing and financing activities:
Addition of capital lease obligations	3,353	2,282
Accounts payable change relating to capital additions	6,721	(205)
Preferred stock dividends paid in common stock		$ 22,891