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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands | Series B Preferred Stock [Member] Preferred Stock [Member] | Series B Preferred Stock [Member] Retained Earnings [Member] | Series B Preferred Stock [Member] | Common Stock [Member] Stock Issued to Directors [Member] | Common Stock [Member] Stock Issued for 401(k) Match [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] Stock Issued to Directors [Member] | Additional Paid-in Capital [Member] Stock Issued for 401(k) Match [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Stock Issued to Directors [Member] | Stock Issued for 401(k) Match [Member] | Total
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Balance at Dec. 31, 2011 | $ 39 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | $ 71,420 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | $ 1,215,229 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (120,557)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (23,498)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (2,520)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | $ 1,140,113 us-gaap_StockholdersEquity
Net income (loss) |  |  |  |  |  |  |  |  |  | 14,954 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | 14,954 us-gaap_NetIncomeLoss
Stock issued |  |  |  | 19 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 336 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | (1,941)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 355 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember |  | (1,941)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (420)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (420)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Series B Preferred Stock dividends declared |  | (552)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (552)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  | (552)us-gaap_DividendsPreferredStock
Common stock dividends declared |  |  |  |  |  | 1 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 11 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (17,133)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | (17,121)us-gaap_DividendsCommonStock
Restricted stock units granted |  |  |  |  |  |  |  |  | 2,746 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 2,746 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Restricted stock unit distributions |  |  |  |  |  | 59 hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (39)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (203)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (183)hl_RestrictedStockUnitDistributions
Balance at Dec. 31, 2012 | 39 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | 71,499 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,218,283 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (123,288)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (23,918)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (4,664)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 1,137,951 us-gaap_StockholdersEquity
Net income (loss) |  |  |  |  |  |  |  |  |  | (25,130)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | (25,130)us-gaap_NetIncomeLoss
Stock issued |  |  |  | 31 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 356 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 387 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember |  |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (2,381)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (2,381)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Series B Preferred Stock dividends declared |  | (552)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (552)us-gaap_DividendsPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  | (552)us-gaap_DividendsPreferredStock
Common stock issued for assets purchased (56,998,000 shares) |  |  |  |  |  | 14,249 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 204,053 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 218,302 us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
Common stock dividends declared |  |  |  |  |  | 2 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 19 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (6,012)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (71)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (6,062)us-gaap_DividendsCommonStock
Repurchase of common shares |  |  |  |  |  |  |  |  |  |  |  | (286)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (286)us-gaap_StockRepurchasedDuringPeriodValue
Restricted stock units granted |  |  |  |  |  |  |  |  | 4,188 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 4,188 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Restricted stock unit distributions |  |  |  |  |  | 109 hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (109)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (59)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (59)hl_RestrictedStockUnitDistributions
Warrants exercised |  |  |  |  |  | 6 hl_WarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 55 hl_WarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 61 hl_WarrantsExercised
Balance at Dec. 31, 2013 | 39 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | 85,896 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 1,426,845 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (154,982)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (26,299)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5,080)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | 1,326,419 us-gaap_StockholdersEquity
Net income (loss) |  |  |  |  |  |  |  |  |  | 17,824 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | 17,824 us-gaap_NetIncomeLoss
Stock issued |  |  |  | 37 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 438 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 475 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedToDirectorsMember |  |
Other comprehensive loss |  |  |  |  |  |  |  |  |  |  | (5,732)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  | (5,732)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Series B Preferred Stock dividends declared |  |  |  |  |  |  |  |  |  | (552)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | (552)us-gaap_DividendsPreferredStock
Stock issued for 401(k) match (811,000 shares) |  |  |  |  | 203 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedFor401KMatchMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 2,226 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedFor401KMatchMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 2,429 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / hl_SharesIssuedDuringPeriodShareBasedCompensationAxis = hl_StockIssuedFor401KMatchMember |
Common stock dividends declared |  |  |  |  |  | 4 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 46 us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3,596)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  | (3,546)us-gaap_DividendsCommonStock
Repurchase of common shares |  |  |  |  |  |  |  |  |  |  |  | (1,501)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (1,501)us-gaap_StockRepurchasedDuringPeriodValue
Restricted stock units granted |  |  |  |  |  |  |  |  | 9,019 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 9,019 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Restricted stock unit distributions |  |  |  |  |  | 665 hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (665)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (2,279)hl_RestrictedStockUnitDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | (2,279)hl_RestrictedStockUnitDistributions
Warrants exercised |  |  |  |  |  | 5,577 hl_WarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 48,841 hl_WarrantsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  | 54,418 hl_WarrantsExercised
Balance at Dec. 31, 2014 | $ 39 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | $ 92,382 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | $ 1,486,750 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (141,306)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (32,031)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (8,860)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  | $ 1,396,974 us-gaap_StockholdersEquity

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration