Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income (loss)	$ 17,824us-gaap_NetIncomeLoss	$ (25,130)us-gaap_NetIncomeLoss	$ 14,954us-gaap_NetIncomeLoss
Non-cash elements included in net income (loss):
Depreciation, depletion and amortization	112,173	82,366	50,113
Net gain on sale of investments		(197)us-gaap_GainLossOnSaleOfInvestments
Unrealized loss on investments	3,224us-gaap_UnrealizedGainLossOnInvestments	2,639us-gaap_UnrealizedGainLossOnInvestments	1,171us-gaap_UnrealizedGainLossOnInvestments
(Gain) loss on disposition of properties, plants, equipment and mineral interests	(25)	(75)	275
Provision for reclamation and closure costs	10,215	1,788	1,106
Deferred income taxes	1,895	(5,893)	546
Stock compensation	4,965us-gaap_ShareBasedCompensation	4,461us-gaap_ShareBasedCompensation	3,101us-gaap_ShareBasedCompensation
Amortization of loan origination fees	2,183us-gaap_AmortizationOfFinancingCosts	1,435us-gaap_AmortizationOfFinancingCosts	460us-gaap_AmortizationOfFinancingCosts
(Gain) loss on derivative contracts	(6,886)	(1,338)	29,627
Foreign exchange (gain) loss	(10,482)	(928)
Reversal of purchase price allocation to product inventory		550
Other non-cash items	(858)us-gaap_OtherNoncashExpense	86us-gaap_OtherNoncashExpense	1,765us-gaap_OtherNoncashExpense
Change in assets and liabilities, net of business acquired:
Accounts receivable	3,091	(1,313)	(4,713)
Inventories	1,119us-gaap_IncreaseDecreaseInInventories	(6,507)us-gaap_IncreaseDecreaseInInventories	(2,442)us-gaap_IncreaseDecreaseInInventories
Other current and non-current assets	(580)	3,281	610
Accounts payable and accrued liabilities	(19,697)	(10,927)	4,927
Accrued payroll and related benefits	16,422	539	(2,118)
Accrued taxes	(3,612)	(4,775)	1,967
Accrued reclamation and closure costs and other non-current liabilities	(47,847)	(13,418)	(32,333)
Net cash provided by operating activities	83,124	26,644	69,016
Investing activities:
Additions to properties, plants, equipment and mineral interests	(122,537)	(150,736)	(113,096)
Proceeds from sale of investments		1,772
Proceeds from disposition of properties, plants and equipment	428	460	886
Redemptions of restricted cash and investment balances	4,334	125
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Purchases of investments	(580)us-gaap_PaymentsToAcquireInvestments	(6,001)us-gaap_PaymentsToAcquireInvestments	(5,823)us-gaap_PaymentsToAcquireInvestments
Acquisition of Aurizon, net of cash acquired		(321,117)
Net cash used by investing activities	(118,355)	(475,497)	(118,038)
Financing activities:
Proceeds from exercise of warrants	54,418us-gaap_ProceedsFromWarrantExercises	61us-gaap_ProceedsFromWarrantExercises
Dividends paid to common stockholders	(3,547)us-gaap_PaymentsOfDividendsCommonStock	(5,991)us-gaap_PaymentsOfDividendsCommonStock	(17,121)us-gaap_PaymentsOfDividendsCommonStock
Dividend paid to preferred stockholders	(552)	(552)	(552)
Debt issuance and loan origination fees paid	(938)us-gaap_PaymentsOfDebtIssuanceCosts	(1,244)us-gaap_PaymentsOfDebtIssuanceCosts	(750)us-gaap_PaymentsOfDebtIssuanceCosts
Acquisition of treasury shares	(3,740)	(286)	(2,144)
Borrowings on debt		490,000
Repayments of capital leases	(9,137)	(7,039)	(5,890)
Net cash provided by (used in) financing activities	36,504	474,949	(26,457)
Effect of exchange rates on cash	(3,783)	(4,905)
Net increase (decrease) in cash and cash equivalents	(2,510)	21,191	(75,479)
Cash and cash equivalents at beginning of year	212,175	190,984	266,463
Cash and cash equivalents at end of year	209,665	212,175	190,984
Cash received (paid) during year for:
Interest	(23,749)us-gaap_InterestPaidNet	(13,465)us-gaap_InterestPaidNet	(1,968)us-gaap_InterestPaidNet
Income tax receipts (payments)	7,124us-gaap_IncomeTaxesPaid	(1,402)us-gaap_IncomeTaxesPaid	4,483us-gaap_IncomeTaxesPaid
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Stock issued for acquisition of assets		218,302us-gaap_StockIssued1
Capital leases acquired	9,475us-gaap_CapitalLeaseObligationsIncurred	12,344us-gaap_CapitalLeaseObligationsIncurred	13,119us-gaap_CapitalLeaseObligationsIncurred
Changes in asset retirement obligations	675	7,998	(3,738)
Payment of accrued compensation in restricted stock units	4,600us-gaap_RestrictedStockExpense
Senior notes contributed to pension plan, par value	$ 6,500us-gaap_NotesIssued1

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed.

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The cash outflow to reacquire common stock during the period.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock warrants.

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