Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income (loss)	$ (22,222)	$ 14,211
Non-cash elements included in net income (loss):
Depreciation, depletion and amortization	55,279	36,042
Gain on sale of investments	(197)
Unrealized gain on investments	(327)
(Gain) loss on disposition of properties, plants, equipment, and mineral interests	(125)	359
Provision for reclamation and closure costs	1,701	3,937
Stock compensation	3,253	2,296
Deferred income taxes	(1,304)	(2,023)
Amortization of loan origination fees	905	324
(Gain) loss on derivative contracts	(15,589)	24,748
Reversal of purchase price allocation to product inventory	550
Other non-cash items, net	(819)	901
Change in assets and liabilities:
Accounts receivable	(14,711)	(9,508)
Inventories	(1,923)	1,025
Other current and non-current assets	(793)	(417)
Accounts payable and accrued liabilities	8,574	4,561
Accrued payroll and related benefits	(281)	(2,754)
Accrued taxes	(10,458)	(611)
Accrued reclamation and closure costs and other non-current liabilities	3,565	(6,603)
Cash provided by operating activities	5,080	66,488
Investing activities:
Additions to properties, plants, equipment and mineral interests	(112,806)	(81,318)
Acquisition of Aurizon, net of cash acquired	(321,117)
Proceeds from sale of investments	1,772
Proceeds from disposition of properties, plants and equipment	126	744
Purchases of investments	(5,738)	(3,261)
Changes in restricted cash and investment balances	(36)
Net cash used in investing activities	(437,799)	(83,835)
Financing activities:
Acquisition of treasury shares	(286)	(497)
Dividends paid to common shareholders	(5,134)	(10,700)
Dividends paid to preferred shareholders	(414)	(414)
Debt issuance and loan origination fees	(1,244)	(750)
Borrowings on debt	490,000
Repayments of capital leases	(5,171)	(4,561)
Net cash provided by (used in) financing activities	477,751	(16,922)
Effect of exchange rates on cash	1,820
Net increase (decrease) in cash and cash equivalents	46,852	(34,269)
Cash and cash equivalents at beginning of period	190,984	266,463
Cash and cash equivalents at end of period	237,836	232,194
Significant non-cash investing and financing activities:
Addition of capital lease obligations	7,674	9,108
Accounts payable change relating to capital additions	(8,101)	(2,905)
Stock issued for the acquisition of Aurizon	$ 218,302