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INCOME TAXES (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Amount $ 6.9us-gaap_TaxCreditCarryforwardAmount    
Undistributed Earnings of Foreign Subsidiaries 89.4us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Deferred Tax Assets, Net, Current 2.2us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 2.1us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound 1.5us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued 0.2us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0.4us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Deferred Tax Assets, Net, Noncurrent 0.5us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 0.8us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (4.5)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (8.4)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Valuation Allowance Deferred Tax Asset Change In Amount Attributable To Operational Results And Decrease In Minimum Pension Liabilities (10.1)hdng_ValuationAllowanceDeferredTaxAssetChangeInAmountAttributableToOperationalResultsAndDecreaseInMinimumPensionLiabilities (9.5)hdng_ValuationAllowanceDeferredTaxAssetChangeInAmountAttributableToOperationalResultsAndDecreaseInMinimumPensionLiabilities  
New York State tax rate 0.00%hdng_NewYorkStatetaxrate    
Valuation Allowance Deferred Tax Asset Change In Amount Attributable To Business Acquisition   1.1hdng_ValuationAllowanceDeferredTaxAssetChangeInAmountAttributableToBusinessAcquisition  
Income Taxes Paid 1.9us-gaap_IncomeTaxesPaid 5.2us-gaap_IncomeTaxesPaid 4.1us-gaap_IncomeTaxesPaid
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 37.3us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
U.S. [Member]      
Operating Loss Carryforwards [Line Items]      
Adjustment To Additional Paid In Capital Income Tax Effect From Net Operating Loss Carryforwards 2.2hdng_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromNetOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= hdng_U.S.Member		    
Operating Loss Carryforwards 35.5us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= hdng_U.S.Member		    
Foreign Tax Authority Expires 2018 - 2034 [Member]      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 3.1us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= hdng_ForeignTaxAuthorityExpires20182033Member		    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 35.4us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Foreign Tax Authority No Expiration [Member]      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 32.3us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= hdng_ForeignTaxAuthorityNoExpirationMember		    
Foreign Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Tax Credit Carryforward, Amount 5.0us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ForeignCountryMember		    
New York State tax investment credit [Member]      
Operating Loss Carryforwards [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (6.9)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ hdng_ChangeindeferredtaxassetvaluationallowanceAxis
= hdng_NewYorkStatetaxinvestmentcreditMember		    
Other Comprehensive Income (Loss) [Member]      
Operating Loss Carryforwards [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 5.6us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ hdng_ChangeindeferredtaxassetvaluationallowanceAxis
= us-gaap_OtherComprehensiveIncomeMember