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Income Taxes Net Operating Loss Carryforwards (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
state
Dec. 31, 2013
state
Dec. 31, 2012
state
Number of states with state tax liability 1hh_NumberOfStatesStateTaxExpense 1hh_NumberOfStatesStateTaxExpense 1hh_NumberOfStatesStateTaxExpense
Internal Revenue Service (IRS) [Member]      
U.S. federal and state net operating loss carryforwards 159.6us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
State and Local Jurisdiction [Member]      
U.S. federal and state net operating loss carryforwards 143.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember