Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 12,552us-gaap_NetIncomeLoss	$ 11,641us-gaap_NetIncomeLoss
Non-cash elements included in net income:
Depreciation, depletion and amortization	25,523	26,054
Unrealized loss (gain) on investments	2,843us-gaap_UnrealizedGainLossOnInvestments	(688)us-gaap_UnrealizedGainLossOnInvestments
Loss on disposition of properties, plants, equipment, and mineral interests	74	275
Provision for reclamation and closure costs	778	933
Stock compensation	1,060us-gaap_ShareBasedCompensation	1,065us-gaap_ShareBasedCompensation
Deferred income taxes	555	(2,851)
Amortization of loan origination fees	454us-gaap_AmortizationOfFinancingCosts	519us-gaap_AmortizationOfFinancingCosts
Gain on derivative contracts	(2,970)	(8,847)
Foreign exchange gain	(11,490)	(4,688)
Other non-cash gains, net	24us-gaap_OtherNoncashExpense	692us-gaap_OtherNoncashExpense
Change in assets and liabilities:
Accounts receivable	(8,210)	1,387
Inventories	3,949us-gaap_IncreaseDecreaseInInventories	4,669us-gaap_IncreaseDecreaseInInventories
Other current and non-current assets	(1,638)	923
Accounts payable and accrued liabilities	4,037	(5,416)
Accrued payroll and related benefits	(5,116)	2,721
Accrued taxes	(263)	4,756
Accrued reclamation and closure costs and other non-current liabilities	(743)	(2,762)
Cash provided by operating activities	21,419	30,383
Investing activities:
Additions to properties, plants, equipment and mineral interests	(26,958)	(26,867)
Proceeds from disposition of properties, plants and equipment	25
Purchases of investments	(947)us-gaap_PaymentsToAcquireInvestments
Changes in restricted cash and investment balances		(2,485)
Net cash used in investing activities	(27,880)	(29,352)
Financing activities:
Acquisition of treasury shares	(941)
Dividends paid to common stockholders	(924)us-gaap_PaymentsOfDividendsCommonStock	(857)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid to preferred stockholders	(138)	(138)
Debt origination fees	(63)us-gaap_PaymentsOfDebtIssuanceCosts	(468)us-gaap_PaymentsOfDebtIssuanceCosts
Repayments of capital leases	(2,347)	(2,403)
Net cash (used) provided by financing activities	(4,413)	(3,866)
Effect of exchange rates on cash	(2,560)	(1,698)
Net decrease in cash and cash equivalents	(13,434)	(4,533)
Cash and cash equivalents at beginning of period	209,665	212,175
Cash and cash equivalents at end of period	196,231	207,642
Significant non-cash investing and financing activities:
Addition of capital lease obligations	1,599us-gaap_CapitalLeaseObligationsIncurred	2,194us-gaap_CapitalLeaseObligationsIncurred
Increase to asset retirement obligations		8,210
Payment of accrued compensation in restricted stock units	$ 3,016us-gaap_RestrictedStockExpense	$ 4,600us-gaap_RestrictedStockExpense

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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