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Derivative and Hedging (Details) (USD $)
0 Months Ended 12 Months Ended
Aug. 19, 2014
Sep. 19, 2014
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative liabilities at fair value     $ 1,448,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue $ 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Derivative Liability     1,448,000us-gaap_DerivativeLiabilities 0us-gaap_DerivativeLiabilities
Interest Rate Swap        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Fixed interest rate on derivative 2.1305%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
     
Notional amount 150,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
     
Term of derivative contract 7 years      
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Fixed interest rate on derivative     3.08%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Notional amount     100,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivative, Inception Date     Jan. 09, 2014  
Derivative, Maturity Date     Jan. 09, 2019  
Derivative liabilities at fair value     1,448,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Gain recognized in other comprehensive income (loss)   $ 1,600,000us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember