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Note 5 - Income Taxes (Details) - Components of the Net Deferred Tax Asset (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:        
Accrued reclamation costs $ 20,573hl_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReclamationCosts $ 39,262hl_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReclamationCosts    
Deferred exploration 32,225hl_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredExploration 35,267hl_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredExploration    
Foreign net operating losses 25,790us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 27,923us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign    
Domestic net operating losses 73,018us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 54,181us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
AMT credit carryforwards 14,698us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 22,155us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Pension and benefit obligation 16,876us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 10,354us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits    
Foreign exchange gain 16,555us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 2,488us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Miscellaneous 29,976us-gaap_DeferredTaxAssetsOther 28,589us-gaap_DeferredTaxAssetsOther    
Total deferred tax assets 229,711us-gaap_DeferredTaxAssetsGross 220,219us-gaap_DeferredTaxAssetsGross    
Valuation allowance (32,094)us-gaap_DeferredTaxAssetsValuationAllowance (27,155)us-gaap_DeferredTaxAssetsValuationAllowance (23,030)us-gaap_DeferredTaxAssetsValuationAllowance (22,895)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 197,617us-gaap_DeferredTaxAssetsNet 193,064us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities:        
Miscellaneous (7,620)us-gaap_DeferredTaxLiabilitiesOther (5,966)us-gaap_DeferredTaxLiabilitiesOther    
Properties, plants and equipment (232,397)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (238,497)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Total deferred tax liabilities (240,017)us-gaap_DeferredIncomeTaxLiabilities (244,463)us-gaap_DeferredIncomeTaxLiabilities    
Net deferred tax asset (liability) $ (42,400)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (51,399)us-gaap_DeferredTaxAssetsLiabilitiesNet