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Interest Rate Derivative Instruments (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 29, 2012
Feb. 08, 2012
Derivative [Line Items]            
Unrealized gains or losses on cash flow hedge derivative effective portion   $ 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ 300,000us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet      
Interest expense related to payments on interest rate swaps 2,049,000us-gaap_InterestExpense 15,308,000us-gaap_InterestExpense        
Interest Rate Swap [Member]            
Derivative [Line Items]            
Interest expense related to payments on interest rate swaps   500,000us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
500,000us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
500,000us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
   
Interest Rate Swap [Member] | Fair Value Measurements, Level 2 [Member]            
Derivative [Line Items]            
Interest rate swap liability recorded at fair value 500,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
500,000us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
     
Cash Flow Hedging [Member] | Interest Rate Swap [Member]            
Derivative [Line Items]            
Derivative inception date   Feb. 08, 2012        
Derivative maturity date   Sep. 28, 2014        
Derivative instruments, notional amount         $ 150,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
$ 150,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember