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INCOME TAXES (Details 2)
 12 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Rate
Dec. 31, 2012
Rate
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Earnings of subsidiaries taxed at other than U.S. statutory rate 13.90%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (18.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Change in enacted rate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Change in valuation allowance 158.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (63.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (46.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
U.S. taxation of international operations (170.10%)hdng_EffectiveIncomeTaxRateReconciliationUSTaxationOfInternationalOperations 12.00%hdng_EffectiveIncomeTaxRateReconciliationUSTaxationOfInternationalOperations 37.30%hdng_EffectiveIncomeTaxRateReconciliationUSTaxationOfInternationalOperations
Change in estimated liabilities 26.80%hdng_EffectiveIncomeTaxRateReconciliationChangeInEstimatedLiabilities 0.10%hdng_EffectiveIncomeTaxRateReconciliationChangeInEstimatedLiabilities 0.40%hdng_EffectiveIncomeTaxRateReconciliationChangeInEstimatedLiabilities
Non-deductible items (170.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 41.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
State and local income taxes (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other adjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (109.60%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 25.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 7.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations