Capitalized drilling costs.

No definition available.

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- Definition

Income tax positions likelihood of being realized upon settlement.

+ References

No definition available.

+ Details

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- Definition

Metals contained in concentrates.

+ References

No definition available.

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- Definition

Percent of mine license tax.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q4)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 4

+ Details

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- Definition

Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Balance Type:	na
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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=31042434&loc=d3e3602-108585

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- Definition

Taxes, excluding payroll, income and excise taxes, if not included elsewhere, that could include production, real and personal property, and other selling and distribution-related taxes.

+ References

No definition available.

+ Details

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Note 1 - Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Capitalized Drilling Costs		$ 8,000,000	$ 5,000,000	$ 3,600,000
Income Tax Positions Likelihood Of Being Realized Upon Settlement	50.00%
Percent Of Mine License Tax			98.00%	98.00%
Environmental Exit Costs, Costs Accrued to Date		105,200,000
Foreign Currency Transaction Loss, before Tax		3,000,000	100,000	200,000
Share-based Compensation		4,461,000	3,101,000	2,073,000
Unfunded Supplemental Executive Retirement Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions	400,000	300,000	300,000	300,000
Defined Benefit Pension Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions	7,500,000	1,000,000	1,100,000
ALASKA
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Percent Of Mine License Tax		98.00%
CANADA \| Resource Taxes [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Taxes, Other		600,000
Mine License Taxes [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Taxes, Other		$ 2,200,000	$ 5,700,000	$ 6,400,000
Silver [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained In Concentrates (in Ounces)		800,000
Metals Contained In Concentrates (in US Ton)		800,000
Gold [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained In Concentrates (in Ounces)		2,994
Metals Contained In Concentrates (in US Ton)		2,994
Zinc [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained In Concentrates (in Ounces)		6,171
Metals Contained In Concentrates (in US Ton)		6,171
Lead [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained In Concentrates (in Ounces)		2,127
Metals Contained In Concentrates (in US Ton)		2,127
Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life		1 year
Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life		27 years