Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income (loss)	$ (13,764)	$ 15,096
Non-cash elements included in net income (loss):
Depreciation, depletion and amortization	34,834	22,799
Gain on sale of investments	(197)
(Gain) loss on disposition of properties, plants, equipment, and mineral interests	(125)	660
Provision for reclamation and closure costs	1,190	2,908
Stock compensation	1,870	1,495
Deferred income taxes	(1,610)	3,697
Amortization of loan origination fees	397	201
(Gain) loss on derivative contracts	(21,528)	9,376
Other non-cash charges, net	(25)	604
Change in assets and liabilities, net of amounts acquired:
Accounts receivable	9,117	(16,838)
Inventories	3,601	3,013
Other current and non-current assets	4,254	1,756
Accounts payable and accrued liabilities	5,790	389
Accrued payroll and related benefits	(1,577)	(3,696)
Accrued taxes	(7,518)	(6,618)
Accrued reclamation and closure costs and other non-current liabilities	(4,436)	(3,602)
Cash provided by operating activities	10,275	31,240
Investing activities:
Additions to properties, plants, equipment and mineral interests	(60,291)	(51,535)
Acqusition of Aurizon, net of cash acquired	(321,117)
Proceeds from sale of investments	1,771
Proceeds from disposition of properties, plants and equipment	126	116
Purchases of investments	(5,738)
Changes in restricted cash and investment balances	55
Net cash used in investing activities	(385,194)	(51,419)
Financing activities:
Acquisition of treasury shares	(286)	(203)
Dividends paid to common shareholders	(4,277)	(9,986)
Dividends paid to preferred shareholders	(276)	(276)
Debt issuance fees	(1,426)
Borrowings on debt	490,000
Repayments of capital leases	(3,425)	(2,492)
Net cash provided by (used in) financing activities	480,310	(12,957)
Change in cash and cash equivalents:
Net increase (decrease) in cash and cash equivalents	105,391	(33,136)
Cash and cash equivalents at beginning of period	190,984	266,463
Cash and cash equivalents at end of period	296,375	233,327
Significant non-cash investing and financing activities:
Addition of capital lease obligations	6,725	5,828
Accounts payable change relating to capital additions	(6,577)	(3,632)
Stock issued for the acquisition of Aurizon	$ 218,302