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Note 16 - Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 209,665 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 212,175 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 190,984 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 266,463 us-gaap_CashAndCashEquivalentsAtCarryingValue
Other current assets | 12,312 us-gaap_OtherAssetsCurrent | 8,324 us-gaap_OtherAssetsCurrent |  |
Properties, plants, and equipment - net | 1,831,564 us-gaap_PropertyPlantAndEquipmentNet | 1,791,601 us-gaap_PropertyPlantAndEquipmentNet |  |
Other non-current assets | 9,415 us-gaap_OtherAssetsNoncurrent | 5,867 us-gaap_OtherAssetsNoncurrent |  |
Total assets | 2,262,064 us-gaap_Assets | 2,232,119 us-gaap_Assets | 1,378,290 us-gaap_Assets |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 90,985 us-gaap_LiabilitiesCurrent | 151,479 us-gaap_LiabilitiesCurrent |  |
Long-term debt | 498,479 us-gaap_LongTermDebtNoncurrent | 490,726 us-gaap_LongTermDebtNoncurrent |  |
Non-current deferred tax liability | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent | 164,861 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other non-current liabilities | 53,057 us-gaap_OtherLiabilitiesNoncurrent | 37,536 us-gaap_OtherLiabilitiesNoncurrent |  |
Stockholders' equity | 1,396,974 us-gaap_StockholdersEquity | 1,326,419 us-gaap_StockholdersEquity | 1,137,951 us-gaap_StockholdersEquity | 1,140,113 us-gaap_StockholdersEquity
Total liabilities and stockholders' equity | 2,262,064 us-gaap_LiabilitiesAndStockholdersEquity | 2,232,119 us-gaap_LiabilitiesAndStockholdersEquity |  |
Consolidation, Eliminations [Member] |  |  |  |
Assets |  |  |  |
Other current assets | 27,433 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 18,453 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Intercompany receivable (payable) | 46,245 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 49,159 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Investments in subsidiaries | (1,317,969)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,195,076)us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Other non-current assets | (88,137)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (84,044)us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | (1,332,428)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,211,508)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | (72)us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |  |
Non-current deferred tax liability | (14,387)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (16,430)us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Stockholders' equity | (1,317,969)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,195,078)us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and stockholders' equity | (1,332,428)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,211,508)us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Consolidated [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 209,665 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 212,175 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 190,984 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 266,463 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember
Other current assets | 106,694 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 131,460 us-gaap_OtherAssetsCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Properties, plants, and equipment - net | 1,831,564 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 1,791,601 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Other non-current assets | 114,141 us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 96,883 us-gaap_OtherAssetsNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Total assets | 2,262,064 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 2,232,119 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 90,985 us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 151,479 us-gaap_LiabilitiesCurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Long-term debt | 512,129 us-gaap_LongTermDebtNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 505,058 us-gaap_LongTermDebtNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Non-current portion of accrued reclamation | 55,619 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 46,766 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Non-current deferred tax liability | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 164,861 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Other non-current liabilities | 53,057 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 37,536 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Stockholders' equity | 1,396,974 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 1,326,419 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Total liabilities and stockholders' equity | 2,262,064 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember | 2,232,119 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = hl_ConsolidatedMember |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 146,885 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 126,271 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 132,266 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 97,850 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other current assets | 7,115 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,795 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Properties, plants, and equipment - net | 1,572 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 803 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany receivable (payable) | 470,306 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 528,290 us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments in subsidiaries | 1,317,969 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,195,076 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current assets | 8,644 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,249 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 1,952,491 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,860,484 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 14,143 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,058 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 498,479 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 490,726 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current liabilities | 42,895 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33,281 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders' equity | 1,396,974 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,326,419 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders' equity | 1,952,491 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,860,484 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 33,824 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 40,009 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 57,075 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 168,433 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other current assets | 48,981 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 75,083 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Properties, plants, and equipment - net | 1,079,658 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,052,102 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany receivable (payable) | (123,671)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (112,815)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current assets | 189,014 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 164,563 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 1,227,806 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,218,942 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 54,918 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 117,421 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 10,597 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 14,292 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-current portion of accrued reclamation | 43,314 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 38,426 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-current deferred tax liability | 14,387 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 16,430 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current liabilities | 11,126 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,043 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Stockholders' equity | 1,093,464 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,028,330 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and stockholders' equity | 1,227,806 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,218,942 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 28,956 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 45,895 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,643 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 180 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other current assets | 23,165 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 33,129 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Properties, plants, and equipment - net | 750,334 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 738,696 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany receivable (payable) | (392,880)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (464,634)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current assets | 4,620 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 11,115 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total assets | 414,195 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 364,201 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 21,996 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 24,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Long-term debt | 3,053 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 40 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Non-current portion of accrued reclamation | 12,305 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 8,340 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Non-current deferred tax liability | 153,300 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 164,861 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current liabilities | (964)us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 212 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Stockholders' equity | 224,505 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 166,748 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total liabilities and stockholders' equity | $ 414,195 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | $ 364,201 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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