$HL
HECLA MINING CO/DE/ Stock $hl

$hl Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000143774921003217 Filed on February 18, 2021

Income Statement

Concept	2020	2019 Q4	2019
Revenue	$691.9M	$224.9M	$673.3M
YoY Change	2.76%	64.76%	18.71%
Cost Of Revenue	$530.8M	$199.6M	$639.4M
YoY Change	-16.99%	44.85%	32.12%
Gross Profit	$161.1M	$25.30M	$33.83M
YoY Change	376.2%	-2046.15%	-54.91%
Gross Profit Margin	23.28%	11.25%	5.02%
Selling, General & Admin	$35.60M	$9.000M	$35.80M
YoY Change	-0.56%	3.45%	-1.92%
% of Gross Profit	22.1%	35.57%	105.82%
Research & Development	$0.00	$2.900M	$535.0K
YoY Change	-100.0%	-70.41%	-90.17%
% of Gross Profit	0.0%	11.46%	1.58%
Depreciation & Amortization	$155.0M	$61.50M	$196.4M
YoY Change	-21.08%	91.59%	41.63%
% of Gross Profit	96.22%	243.08%	580.57%
Operating Expenses	$94.12M	$14.40M	$80.51M
YoY Change	16.91%	-27.64%	-31.9%
Operating Profit	$66.98M	$10.90M	-$46.68M
YoY Change	-243.49%	-151.42%	33.15%
Interest Expense	$49.57M	-$19.70M	$48.45M
YoY Change	2.32%	337.78%	18.33%
% of Operating Profit	74.01%	-180.73%
Other Income/Expense, Net	-$68.24M	-$1.000M	-$66.55M
YoY Change	2.53%	66.67%	-1235.26%
Pretax Income	-$1.258M	-$12.10M	-$113.2M
YoY Change	-98.89%	-58.13%	287.82%
Income Tax	$8.199M	-$4.100M	-$18.32M
% Of Pretax Income
Net Earnings	-$9.457M	-$8.000M	-$94.91M
YoY Change	-90.04%	-66.24%	254.79%
Net Earnings / Revenue	-1.37%	-3.56%	-14.1%
Basic Earnings Per Share	-$0.02		-$0.19
Diluted Earnings Per Share	-$0.02	-$15.91K	-$0.19
COMMON SHARES
Basic Shares Outstanding	527.3M	495.5M	490.4M
Diluted Shares Outstanding	527.3M		490.4M

Balance Sheet

Concept	2020	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$129.8M	$62.50M	$62.50M
YoY Change	107.68%	128.19%	128.1%
Cash & Equivalents	$129.8M	$62.45M	$62.50M
Short-Term Investments
Other Short-Term Assets	$19.10M	$12.04M	$12.00M
YoY Change	59.17%	7.68%	-48.72%
Inventory	$96.50M	$30.08M	$66.20M
Prepaid Expenses
Receivables	$27.90M	$12.00M	$12.00M
Other Receivables	$11.30M	$26.40M	$26.40M
Total Short-Term Assets	$284.7M	$178.8M	$179.1M
YoY Change	58.96%	8.95%	9.07%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.356B	$2.447B	$2.440B
YoY Change	-3.45%	-2.88%	-3.17%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$15.10M	$6.200M	$6.200M
YoY Change	143.55%	-6.06%	-6.06%
Other Assets	$12.00M	$7.336M	$11.90M
YoY Change	0.84%	-28.04%	-9.85%
Total Long-Term Assets	$2.383B	$2.482B	$2.458B
YoY Change	-3.06%	-2.28%	-3.21%
TOTAL ASSETS
Total Short-Term Assets	$284.7M	$178.8M	$179.1M
Total Long-Term Assets	$2.383B	$2.482B	$2.458B
Total Assets	$2.668B	$2.661B	$2.637B
YoY Change	1.15%	-1.6%	-2.46%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$68.50M	$57.70M	$57.70M
YoY Change	18.72%	-25.93%	-25.93%
Accrued Expenses	$54.60M	$42.90M	$42.90M
YoY Change	27.27%	8.88%	8.88%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$6.500M	$5.400M	$5.400M
YoY Change	20.37%	1.89%	1.89%
Total Short-Term Liabilities	$149.8M	$117.0M	$117.0M
YoY Change	28.03%	-14.11%	-14.1%
LONG-TERM LIABILITIES
Long-Term Debt	$516.5M	$504.7M	$511.9M
YoY Change	0.9%	-5.27%	-5.33%
Other Long-Term Liabilities	$166.6M	$6.856M	$177.7M
YoY Change	-6.25%	-30.68%	9.29%
Total Long-Term Liabilities	$683.1M	$511.6M	$689.6M
YoY Change	-0.94%	-5.73%	-1.95%
TOTAL LIABILITIES
Total Short-Term Liabilities	$149.8M	$117.0M	$117.0M
Total Long-Term Liabilities	$683.1M	$511.6M	$689.6M
Total Liabilities	$965.4M	$964.2M	$944.9M
YoY Change	2.17%	-4.81%	-6.72%
SHAREHOLDERS EQUITY
Retained Earnings		-$349.2M
YoY Change		40.64%
Common Stock		$132.3M
YoY Change		8.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$22.97M
YoY Change		10.76%
Treasury Stock Shares		$6.287M
Shareholders Equity	$1.702B	$1.697B	$1.692B
YoY Change
Total Liabilities & Shareholders Equity	$2.668B	$2.661B	$2.637B
YoY Change	1.15%	-1.6%	-2.46%

Cashflow Statement

Concept	2020	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	-$9.457M	-$8.000M	-$94.91M
YoY Change	-90.04%	-66.24%	254.79%
Depreciation, Depletion And Amortization	$155.0M	$61.50M	$196.4M
YoY Change	-21.08%	91.59%	41.63%
Cash From Operating Activities	$180.8M	$57.30M	$120.9M
YoY Change	49.58%	201.58%	28.28%
INVESTING ACTIVITIES
Capital Expenditures	$91.02M	-$24.10M	$121.4M
YoY Change	-25.04%	-55.04%	-11.33%
Acquisitions	$0.00		$0.00
YoY Change			-100.0%
Other Investing Activities	-$1.900M	$100.0K	-$1.554M
YoY Change	22.27%	-94.12%	-96.09%
Cash From Investing Activities	-$92.90M	-$24.00M	-$119.9M
YoY Change	-22.5%	-53.76%	-49.33%
FINANCING ACTIVITIES
Cash Dividend Paid	$9.152M		$5.466M
YoY Change	67.44%		10.54%
Common Stock Issuance & Retirement, Net	$2.745M	$49.00M	-$46.79M
YoY Change	-105.87%		1055.26%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$19.38M	-4.400M	$33.19M
YoY Change	-158.39%	-650.0%	-322.98%
NET CHANGE
Cash From Operating Activities	$180.8M	57.30M	$120.9M
Cash From Investing Activities	-$92.90M	-24.00M	-$119.9M
Cash From Financing Activities	-$19.38M	-4.400M	$33.19M
Net Change In Cash	$67.41M	28.90M	$35.06M
YoY Change	92.24%	-190.03%	-122.09%
FREE CASH FLOW
Cash From Operating Activities	$180.8M	$57.30M	$120.9M
Capital Expenditures	$91.02M	-$24.10M	$121.4M
Free Cash Flow	$89.78M	$81.40M	-$555.0K
YoY Change	-16276.04%	12.12%	-98.7%

Facts In Submission

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CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26563000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-3559000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-3277000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-1550000	USD
CY2020	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	7980000	USD
CY2019	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	8436000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-13814000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2443000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4421000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5159000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17807000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-12369000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-94398000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-44370000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	140905000	USD
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-0	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	923000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-34000	USD
CY2020	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	10268000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-2389000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-2816000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	0	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	1399000	USD
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	8191000	USD
CY2020	hl	Paidinkind Prepayment Of Debt Fee PaidinkindPrepaymentOfDebtFee	0	USD
CY2019	hl	Paidinkind Prepayment Of Debt Fee PaidinkindPrepaymentOfDebtFee	2855000	USD
CY2018	hl	Paidinkind Prepayment Of Debt Fee PaidinkindPrepaymentOfDebtFee	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-572000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-4643000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2793000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	183000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2411000	USD
CY2020	us-gaap	Environmental Expense And Liabilities EnvironmentalExpenseAndLiabilities	6189000	USD
CY2019	us-gaap	Environmental Expense And Liabilities EnvironmentalExpenseAndLiabilities	6914000	USD
CY2018	us-gaap	Environmental Expense And Liabilities EnvironmentalExpenseAndLiabilities	6090000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	5505000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	33387000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	9699000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6458000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	5668000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	6278000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3666000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2637000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2077000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-5578000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-5613000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	15366000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-2680000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-8025000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	7104000	USD
CY2020	hl	Foundation Grant Expense FoundationGrantExpense	1970000	USD
CY2019	hl	Foundation Grant Expense FoundationGrantExpense	0	USD
CY2018	hl	Foundation Grant Expense FoundationGrantExpense	0	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	176000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-42000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	66000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1080000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10939000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-9843000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	13208000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-16146000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	27512000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2381000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-15618000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1726000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	19379000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-24355000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	17795000	USD
CY2020	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	14445000	USD
CY2019	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	9226000	USD
CY2018	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-2425000	USD
CY2020	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	3561000	USD
CY2019	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	-3155000	USD
CY2018	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	645000	USD
CY2020	hl	Increase Decrease In Accrued Reclamation And Closure Costs And Other Non Current Liabilities IncreaseDecreaseInAccruedReclamationAndClosureCostsAndOtherNonCurrentLiabilities	3085000	USD
CY2019	hl	Increase Decrease In Accrued Reclamation And Closure Costs And Other Non Current Liabilities IncreaseDecreaseInAccruedReclamationAndClosureCostsAndOtherNonCurrentLiabilities	-7532000	USD
CY2018	hl	Increase Decrease In Accrued Reclamation And Closure Costs And Other Non Current Liabilities IncreaseDecreaseInAccruedReclamationAndClosureCostsAndOtherNonCurrentLiabilities	7199000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	180793000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	120866000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	94221000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	91016000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	121421000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	136933000	USD
CY2020	hl	Proceeds From Sale Of Investments ProceedsFromSaleOfInvestments	0	USD
CY2019	hl	Proceeds From Sale Of Investments ProceedsFromSaleOfInvestments	1760000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-19379000	USD
CY2018	hl	Proceeds From Sale Of Investments ProceedsFromSaleOfInvestments	0	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	331000	USD
CY2019	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	7157000	USD
CY2018	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	7339000	USD
CY2020	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2019	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2018	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	4377000	USD
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2216000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	389000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	31971000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	64895000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	139326000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-92901000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-119867000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-236547000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	49019000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	6744000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	8600000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4914000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4393000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	552000	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	552000	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	552000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1356000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	976000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2638000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2745000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2231000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2694000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	716327000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	279500000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	102024000	USD
CY2020	us-gaap	Repayments Of Debt RepaymentsOfDebt	716500000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	279500000	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	106036000	USD
CY2020	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	5953000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	33189000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-14884000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-1107000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	875000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-1515000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	67406000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	35063000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-158725000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	63477000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	28414000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	187139000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	130883000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	63477000	USD
CY2019	hl	Common Stock Issued For Prepayment Of Debt CommonStockIssuedForPrepaymentOfDebt	33457000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	62452000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	27864000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	11952000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1584000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	20048000	USD
CY2020Q4	us-gaap	Other Receivables OtherReceivables	9745000	USD
CY2019Q4	us-gaap	Other Receivables OtherReceivables	6421000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	28414000	USD
CY2018	hl	Common Stock Issued For Prepayment Of Debt CommonStockIssuedForPrepaymentOfDebt	0	USD
CY2020	hl	Marketable Equity Securities Received For Sale Of Mineral Interest MarketableEquitySecuritiesReceivedForSaleOfMineralInterest	0	USD
CY2019	hl	Marketable Equity Securities Received For Sale Of Mineral Interest MarketableEquitySecuritiesReceivedForSaleOfMineralInterest	2257000	USD
CY2018	hl	Marketable Equity Securities Received For Sale Of Mineral Interest MarketableEquitySecuritiesReceivedForSaleOfMineralInterest	0	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	129830000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	34853000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	42972000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	38400000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	7913000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-3385000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	115000	USD
CY2020	hl	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Shares Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssuedValue	0	USD
CY2019	hl	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Shares Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssuedValue	-325000	USD
CY2018	hl	Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Shares Issued Value NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssuedValue	252544000	USD
CY2020	hl	Finance Lease Liability Additions FinanceLeaseLiabilityAdditions	9113000	USD
CY2019	hl	Finance Lease Liability Additions FinanceLeaseLiabilityAdditions	6506000	USD
CY2018	hl	Finance Lease Liability Additions FinanceLeaseLiabilityAdditions	7008000	USD
CY2020	hl	Noncash Activity Recognition Of Operating Lease Liabilites And Rightofuse Assets NoncashActivityRecognitionOfOperatingLeaseLiabilitesAndRightofuseAssets	0	USD
CY2019	hl	Noncash Activity Recognition Of Operating Lease Liabilites And Rightofuse Assets NoncashActivityRecognitionOfOperatingLeaseLiabilitesAndRightofuseAssets	22365000	USD
CY2018	hl	Noncash Activity Recognition Of Operating Lease Liabilites And Rightofuse Assets NoncashActivityRecognitionOfOperatingLeaseLiabilitesAndRightofuseAssets	0	USD
CY2020	hl	Common Stock Contributed To Pension Plans CommonStockContributedToPensionPlans	16032000	USD
CY2019	hl	Common Stock Contributed To Pension Plans CommonStockContributedToPensionPlans	3600000	USD
CY2018	hl	Common Stock Contributed To Pension Plans CommonStockContributedToPensionPlans	7595000	USD
CY2020	hl	Common Stock Issued For401 K Match CommonStockIssuedFor401KMatch	4624000	USD
CY2019	hl	Common Stock Issued For401 K Match CommonStockIssuedFor401KMatch	3862000	USD
CY2018	hl	Common Stock Issued For401 K Match CommonStockIssuedFor401KMatch	3705000	USD
CY2020	us-gaap	Restricted Stock Expense RestrictedStockExpense	5096000	USD
CY2019	us-gaap	Restricted Stock Expense RestrictedStockExpense	8274000	USD
CY2018	us-gaap	Restricted Stock Expense RestrictedStockExpense	4863000	USD
CY2020	hl	Common Stock Issued For Prepayment Of Debt CommonStockIssuedForPrepaymentOfDebt	0	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	57936000	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	30364000	USD
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	38608000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	35849000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	19114000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	12038000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	284681000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	179124000	USD
CY2020Q4	us-gaap	Long Term Investments LongTermInvestments	15148000	USD
CY2019Q4	us-gaap	Long Term Investments LongTermInvestments	6207000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1053000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1025000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2345219000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2423698000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10628000	USD
CY2020Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	507242000	USD
CY2019Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	504729000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	132475000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	138282000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	44144000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	56219000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4364000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	14157000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	5804000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	11737000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	6170000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	16381000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	2912000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	3537000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	138000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	2000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	149785000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	116974000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	9274000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	7214000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	7634000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	10818000	USD
CY2020Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	110466000	USD
CY2019Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	103793000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	8083000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	7336000	USD
CY2020Q4	us-gaap	Assets Assets	2667724000	USD
CY2019Q4	us-gaap	Assets Assets	2637308000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	68516000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	57716000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	31807000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	26916000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	8349000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	4776000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6491000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5429000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3008000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5580000	USD
CY2020Q4	us-gaap	Accrued Reclamation Costs Current AccruedReclamationCostsCurrent	5582000	USD
CY2019Q4	us-gaap	Accrued Reclamation Costs Current AccruedReclamationCostsCurrent	4581000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	6856000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	965384000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	944885000	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	39000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	39000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	134629000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	132292000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2003576000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1973700000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-379519000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-353331000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-32889000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-37310000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	23496000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	22967000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1702340000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1692423000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2667724000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2637308000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1461277000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26563000	USD
CY2018	hl	Impact Of Adoption Of Accounting Standard Update ImpactOfAdoptionOfAccountingStandardUpdate	0	USD
CY2018	hl	Stock Issued During Period Value Directors StockIssuedDuringPeriodValueDirectors	593000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	6746000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2018	hl	Stock Issued During Period Value401k Match StockIssuedDuringPeriodValue401kMatch	3705000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	5649000	USD
CY2018	hl	Stock And Warrants Issued During Period Value Acquisitions StockAndWarrantsIssuedDuringPeriodValueAcquisitions	252544000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	4393000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3555000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	7595000	USD
CY2018	hl	Restricted Stock Unit Distributions RestrictedStockUnitDistributions	-1386000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17807000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1690963000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-99557000	USD
CY2019	hl	Stock Issued During Period Value Directors StockIssuedDuringPeriodValueDirectors	455000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	49019000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2019	hl	Stock Issued During Period Value401k Match StockIssuedDuringPeriodValue401kMatch	3862000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	5213000	USD
CY2019	hl	Restricted Stock Unit Distributions RestrictedStockUnitDistributions	-636000	USD
CY2019	hl	Adjustments To Additional Paid In Capital Fair Value Adjustment Warrant Issued AdjustmentsToAdditionalPaidInCapitalFairValueAdjustmentWarrantIssued	-325000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	4914000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6679000	USD
CY2019	hl	Stock Issued During Period Value Prepayment Of Debt StockIssuedDuringPeriodValuePrepaymentOfDebt	33457000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	3600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5159000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1692423000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-16790000	USD
CY2020	hl	Stock Issued During Period Value Directors StockIssuedDuringPeriodValueDirectors	1486000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2020	hl	Stock Issued During Period Value401k Match StockIssuedDuringPeriodValue401kMatch	4624000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	4975000	USD
CY2020	hl	Restricted Stock Unit Distributions RestrictedStockUnitDistributions	-1479000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	8600000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3830000	USD
CY2020	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	1970000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	16032000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4421000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1702340000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:27pt;"><i>B.</i> <i> Assumptions and Use of Estimates</i> — Preparing financial statements requires management to make estimates and assumptions that affect the reported amounts and related disclosure of assets, liabilities, revenue and expenses at the date of the consolidated financial statements and reporting periods. We consider our most critical accounting estimates to be future metals prices; obligations for environmental, reclamation and closure matters; mineral reserves; and valuation of business combinations. Other significant areas requiring the use of management assumptions and estimates relate to reserves for contingencies and litigation; asset impairments, including long-lived assets and investments; valuation of deferred tax assets; and post-employment, post-retirement and other employee benefit assets and liabilities. We have based our estimates on historical experience and various other assumptions that we believe to be reasonable. Accordingly, actual results <em style="font: inherit;"> may </em>differ materially from these estimates under different assumptions or conditions.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1100000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1000000.0	USD
CY2020Q4	hl	Capitalized Drilling Costs CapitalizedDrillingCosts	4400000	USD
CY2019Q4	hl	Capitalized Drilling Costs CapitalizedDrillingCosts	14400000	USD
CY2018Q4	hl	Capitalized Drilling Costs CapitalizedDrillingCosts	11600000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-4600000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-8200000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	10300000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	15100000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	6200000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	9900000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	9800000	USD
CY2020	hl	Availableforsale Equity Securities Acquired During Period Cost Basis AvailableforsaleEquitySecuritiesAcquiredDuringPeriodCostBasis	2200000	USD
CY2019	hl	Availableforsale Equity Securities Acquired During Period Cost Basis AvailableforsaleEquitySecuritiesAcquiredDuringPeriodCostBasis	2700000	USD
CY2019	hl	Marketable Equity Securities Received For Sale Of Mineral Interest MarketableEquitySecuritiesReceivedForSaleOfMineralInterest	2300000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	10300000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2400000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3824404000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3734094000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1479185000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1310396000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2345219000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2423698000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	91000000.0	USD
CY2020	hl	Suspension Related Costs SuspensionRelatedCosts	13500000	USD
CY2020	hl	Assets On Care And Maintenance Depreciation Expense AssetsOnCareAndMaintenanceDepreciationExpense	5600000	USD
CY2020	hl	Costs For Mining Material CostsForMiningMaterial	7700000	USD
CY2020	hl	Costs Related To Mining Non Refractory Ore CostsRelatedToMiningNonRefractoryOre	11500000	USD
CY2020Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	74000000.0	USD
CY2019Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	64900000	USD
CY2020Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	51700000	USD
CY2019Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	44300000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	116048000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	108374000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	5582000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	4581000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	110466000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	103793000	USD
CY2017Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	86045000	USD
CY2018	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	250000	USD
CY2018	hl	Accrual For Environmental Loss Contingencies Accretion AccrualForEnvironmentalLossContingenciesAccretion	5309000	USD
CY2018	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	1280000	USD
CY2018	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Acquisitions And Divestitures AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForAcquisitionsAndDivestitures	19571000	USD
CY2018	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	4066000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	108389000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	472000	USD
CY2019	hl	Accrual For Environmental Loss Contingencies Accretion AccrualForEnvironmentalLossContingenciesAccretion	7122000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	-4522000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	3087000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	108374000	USD
CY2020	hl	Accrual For Environmental Loss Contingencies Accretion AccrualForEnvironmentalLossContingenciesAccretion	5912000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	2543000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	781000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	116048000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	116000000.0	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	108400000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	91831000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	89417000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	2543000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-4522000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5912000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	7122000	USD
CY2020	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	78000	USD
CY2019	us-gaap	Asset Retirement Obligation Cash Paid To Settle AssetRetirementObligationCashPaidToSettle	186000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	100208000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	91831000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1500000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	868000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	701000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	454000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	6355000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	7289000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	4382000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7223000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7990000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4836000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-4392000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-15243000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-7147000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2696000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-16848000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4390000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7088000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-32091000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-11537000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	135000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-24101000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-6701000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-16655000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-3030000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	0.02	pure
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-3158000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	0.10	pure
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-786000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-6986000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-5327000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depletion EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion	0.32	pure
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-123658000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-33264000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-3498000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-25968000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.05	pure
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-686000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.01	pure
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2304000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.07	pure
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1164000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.07	pure
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-2648000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.02	pure
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	849000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.03	pure
CY2020	hl	Effective Income Tax Reconciliation Foreign Currency Translation Of Monetary Assets And Liabilities Amount EffectiveIncomeTaxReconciliationForeignCurrencyTranslationOfMonetaryAssetsAndLiabilitiesAmount	4824000	USD
CY2020	hl	Income Tax Rate Reconciliation Foreign Currency Translation Percentage IncomeTaxRateReconciliationForeignCurrencyTranslationPercentage	-0.29	pure
CY2019	hl	Effective Income Tax Reconciliation Foreign Currency Translation Of Monetary Assets And Liabilities Amount EffectiveIncomeTaxReconciliationForeignCurrencyTranslationOfMonetaryAssetsAndLiabilitiesAmount	8629000	USD
CY2019	hl	Income Tax Rate Reconciliation Foreign Currency Translation Percentage IncomeTaxRateReconciliationForeignCurrencyTranslationPercentage	-0.07	pure
CY2018	hl	Effective Income Tax Reconciliation Foreign Currency Translation Of Monetary Assets And Liabilities Amount EffectiveIncomeTaxReconciliationForeignCurrencyTranslationOfMonetaryAssetsAndLiabilitiesAmount	-6747000	USD
CY2018	hl	Income Tax Rate Reconciliation Foreign Currency Translation Percentage IncomeTaxRateReconciliationForeignCurrencyTranslationPercentage	0.20	pure
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-991000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.06	pure
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-3947000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.03	pure
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	469000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.01	pure
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	458000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.03	pure
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1056000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.01	pure
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	970000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.03	pure
CY2020	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Amount EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignAmount	-0	USD
CY2020	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Percentage EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignPercentage	0	pure
CY2019	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Amount EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignAmount	-0	USD
CY2019	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Percentage EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignPercentage	0	pure
CY2018	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Amount EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignAmount	-278000	USD
CY2018	hl	Effective Income Tax Rate Reconciliation Tax Withholding Foreign Percentage EffectiveIncomeTaxRateReconciliationTaxWithholdingForeignPercentage	0.01	pure
CY2020	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Amount EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesAmount	3572000	USD
CY2020	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Percent EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesPercent	-0.22	pure
CY2019	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Amount EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesAmount	1242000	USD
CY2019	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Percent EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesPercent	-0.01	pure
CY2018	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Amount EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesAmount	3501000	USD
CY2018	hl	Effective Income Tax Rate Reconciliation Mining And Other Taxes Percent EffectiveIncomeTaxRateReconciliationMiningAndOtherTaxesPercent	-0.11	pure
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	719000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.04	pure
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1251000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.01	pure
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2375000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.07	pure
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	135000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.01	pure
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-24101000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.19	pure
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-6701000	USD
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.20	pure
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	129600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	134700000	USD
CY2020Q4	hl	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reclamation Costs DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReclamationCosts	32938000	USD
CY2019Q4	hl	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reclamation Costs DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReclamationCosts	30038000	USD
CY2020Q4	hl	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Exploration DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredExploration	11623000	USD
CY2019Q4	hl	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Exploration DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredExploration	13762000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	13303000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	12013000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	198438000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	175024000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	12341000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	13866000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	19808000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	21719000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	3358000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	4149000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	18385000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	30871000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	310194000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	301442000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	77210000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	86634000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	232984000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	214808000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2551000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	904000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	359996000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	348649000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	362547000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	349553000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	129563000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	134745000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	77000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	87000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	86634000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	94981000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	78684000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	77210000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	86634000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	94981000	USD
CY2020	hl	Operating Loss Carryforwards Expiration Period OperatingLossCarryforwardsExpirationPeriod	P20Y
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	2870000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	15800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	9300000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	12600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	7200000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	22300000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	20600000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	7400000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	5900000	USD
CY2018	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	5300000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	600000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	700000	USD
CY2018	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	16800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1100000	USD
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.067	pure
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	7053000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	4801000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	3116000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	1849000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	16819000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	1054000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	15765000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10600000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3000000.0	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	7600000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10600000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	7200000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	7500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	12600000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y4M24D
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	3811000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5618000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	6482000	USD
CY2020	hl	Defined Benefit Plan Benefit Obligation Change In Mortality Rate DefinedBenefitPlanBenefitObligationChangeInMortalityRate	-1521000	USD
CY2019	hl	Defined Benefit Plan Benefit Obligation Change In Mortality Rate DefinedBenefitPlanBenefitObligationChangeInMortalityRate	-2130000	USD
CY2020	hl	Defined Benefit Plan Benefit Obligation Increase Decrease For Discount Rate Change DefinedBenefitPlanBenefitObligationIncreaseDecreaseForDiscountRateChange	17040000	USD
CY2019	hl	Defined Benefit Plan Benefit Obligation Increase Decrease For Discount Rate Change DefinedBenefitPlanBenefitObligationIncreaseDecreaseForDiscountRateChange	25806000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	121000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-395000	USD
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6547000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5893000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	192954000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	172909000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	116067000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	96329000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	2521000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	555000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	526000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	2339000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	12622000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1980000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10642000	USD
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	16800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	12600000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	172909000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	144638000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	5334000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4401000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	14801000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	21536000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	23731000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	4095000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	6547000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5893000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	148052000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	116067000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-44902000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-56842000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	5334000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	758000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	622000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	44144000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	56219000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	53085000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	49525000	USD
CY2020Q4	hl	Defined Benefit Plan Amounts Recognized In Balance Sheet Including Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAmountsRecognizedInBalanceSheetIncludingAccumulatedOtherComprehensiveIncomeBeforeTax	8183000	USD
CY2019Q4	hl	Defined Benefit Plan Amounts Recognized In Balance Sheet Including Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAmountsRecognizedInBalanceSheetIncludingAccumulatedOtherComprehensiveIncomeBeforeTax	-7316000	USD
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0332	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0459	pure
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0264	pure
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0332	pure
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0645	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0637	pure
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0200	pure
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease	0.0200	pure
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0200	pure
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0200	pure
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	4401000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	5009000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5618000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	6482000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	5508000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	7489000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	5982000	USD
CY2018	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	6536000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	117000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	61000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	61000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-4652000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-4389000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.55	pure
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.05	pure
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	10000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	10000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	4000	USD
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	750000000
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	8420000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	8661000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	9419000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	47269000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-3726000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	8232000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	9351000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	7768000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	8314000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	8199000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	192954000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	172908000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	189931000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	168239000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	148051000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	116067000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-51660000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	1425000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.25
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	538487415
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6821044
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	531666371
CY2019Q4	hl	Average Realized Silver Price Minimum Dividend Threshold AverageRealizedSilverPriceMinimumDividendThreshold	30
CY2020Q4	hl	Average Realized Silver Price Minimum Dividend Threshold AverageRealizedSilverPriceMinimumDividendThreshold	25
CY2020Q3	hl	Average Realized Silver Price Per Ounce AverageRealizedSilverPricePerOunce	25.32	USD
CY2020Q4	hl	Average Realized Silver Price Per Ounce AverageRealizedSilverPricePerOunce	25.16	USD
CY2016Q1	hl	Atthemarket Equity Distribution Agreement Maximum Proceeds AtthemarketEquityDistributionAgreementMaximumProceeds	75000000	USD
	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	28583845
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	73500000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1500000	USD
CY2019Q4	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	21410231
CY2019Q4	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	49000000.0	USD
CY2019Q4	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1000000.0	USD
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.25
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	157816
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3500000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3997168
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	2.46
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1688111
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.03
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	70236
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	2.08
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	1678909
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	2.83
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3936134
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	2.55
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3936134
CY2020Q4	hl	Maximum Allocation Of Forecasted Cad Demonimated Operating Costs MaximumAllocationOfForecastedCADDemonimatedOperatingCosts	0.75	pure
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	7600000	USD
CY2020	us-gaap	Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings Net ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet	2700000	USD
CY2020	us-gaap	Gain Loss On Components Excluded From Assessment Of Foreign Currency Cash Flow Hedge Effectiveness GainLossOnComponentsExcludedFromAssessmentOfForeignCurrencyCashFlowHedgeEffectiveness	0	USD
CY2020Q4	hl	Maximum Allocation Of Forecasted Cad Demonimated Operating Costs MaximumAllocationOfForecastedCADDemonimatedOperatingCosts	0.75	pure
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	691873000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	673266000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	567137000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	51581000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-57109000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-39126000	USD
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	102519000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	123729000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	146451000	USD
CY2020	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	157130000	USD
CY2019	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	199518000	USD
CY2018	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	134044000	USD
CY2020	hl	Other Significant Noncash Income Expense OtherSignificantNoncashIncomeExpense	11164000	USD
CY2019	hl	Other Significant Noncash Income Expense OtherSignificantNoncashIncomeExpense	5875000	USD
CY2018	hl	Other Significant Noncash Income Expense OtherSignificantNoncashIncomeExpense	-9542000	USD
CY2020Q4	us-gaap	Assets Assets	2667724000	USD
CY2019Q4	us-gaap	Assets Assets	2637308000	USD
CY2018Q4	us-gaap	Assets Assets	2703944000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2345219000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2423698000	USD
CY2020	hl	Smelter And Refining Charges SmelterAndRefiningCharges	68361000	USD
CY2019	hl	Smelter And Refining Charges SmelterAndRefiningCharges	33004000	USD
CY2018	hl	Smelter And Refining Charges SmelterAndRefiningCharges	24177000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	691873000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	673266000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	567137000	USD
CY2020	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	708253000	USD
CY2019	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	674549000	USD
CY2018	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	559053000	USD
CY2020	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	708253000	USD
CY2019	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	674549000	USD
CY2018	hl	Sales Revenue Goods Excluding Gain Loss On Forward Contracts SalesRevenueGoodsExcludingGainLossOnForwardContracts	559053000	USD
CY2020	us-gaap	Derivative Loss On Derivative DerivativeLossOnDerivative	16400000	USD
CY2019	us-gaap	Derivative Loss On Derivative DerivativeLossOnDerivative	1300000	USD
CY2018	us-gaap	Derivative Gain On Derivative DerivativeGainOnDerivative	8100000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	27900000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	12000000.0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-16790000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-99557000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26563000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2018	us-gaap	Dividends Preferred Stock DividendsPreferredStock	552000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-17342000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-100109000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-27115000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	527329000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	490449000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	433419000
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	527329000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	490449000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	433419000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.03
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.20
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.06
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.03
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.20
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.06

Files In Submission

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$HL
HECLA MINING CO/DE/ Stock $hl

2020 Form 10-K Financial Statement

#000143774921003217 Filed on February 18, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$HL HECLA MINING CO/DE/ Stock $hl

2020 Form 10-K Financial Statement

#000143774921003217 Filed on February 18, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$HL
HECLA MINING CO/DE/ Stock $hl