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Volume of Activity for Interest Rate Derivative Instruments (Details) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest Rate Swap
    
Derivative [Line Items]    
Notional Value, Beginning of period $ 8,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 10,700,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Expirations and terminations (1,000,000)hts_DerivativeNotionalAmountSettlementsTerminationsOrExpirations
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 (600,000)hts_DerivativeNotionalAmountSettlementsTerminationsOrExpirations
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Notional Value, End of period $ 7,300,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 10,100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember