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Interest Rate Derivative Instruments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Feb. 29, 2012
Feb. 08, 2012
Derivative [Line Items]          
Unrealized gains or losses on cash flow hedge derivative effective portion $ 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ 100,000us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet      
Interest expense related to payments on interest rate swaps 5,342,000us-gaap_InterestExpense 2,065,000us-gaap_InterestExpense      
Interest Rate Swap [Member]          
Derivative [Line Items]          
Interest expense related to payments on interest rate swaps 0us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
200,000us-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 0us-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
   
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