Drilling and related costs.

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- Definition

Types of metal contained in concentrates.

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- Definition

Total number of defined contribution plans the legal entity maintains.

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

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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.

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- Definition

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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

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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.

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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.

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Note 1 - Summary of Significant Accounting Policies (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) oz T	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Capitalized Drilling Costs			$ 6,700	$ 5,300	$ 8,000
Number of Defined Contribution Plans Maintained			2
Environmental Exit Costs, Costs Accrued to Date			$ 95,500
Foreign Currency Transaction Gain (Loss), Realized			24,551	11,535	2,959
Share-based Compensation			5,425	4,965	4,461
Deferred Tax Assets, Net of Valuation Allowance, Current			$ 17,980	12,029
Defined Benefit Pension Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions	$ 4,900			6,500
Silver [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained in Concentrates \| oz			1,500,000
Gold [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained in Concentrates \| oz			5,605
Zinc [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained in Concentrates \| T			12,714
Lead [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Metals Contained in Concentrates \| T			4,553
Scenario, Forecast [Member] \| Defined Benefit Pension Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		$ 5,300
Unfunded Supplemental Executive Retirement Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions			$ 400	$ 300	300
Unfunded Supplemental Executive Retirement Plan [Member] \| Scenario, Forecast [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions		$ 400
Defined Benefit Pension Plan [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Pension Contributions					$ 1,000
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			22 years