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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt    
Fixed-rate debt $ 469,604us-gaap_LongtermDebtPercentageBearingFixedInterestAmount $ 358,590us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Variable-rate debt 154,699us-gaap_LongtermDebtPercentageBearingVariableInterestAmount 76,999us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Total debt $ 624,303us-gaap_LongTermDebt $ 435,589us-gaap_LongTermDebt
Cash flow hedges | Interest rate derivatives    
Debt    
Weighted average interest rate 4.40%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 5.03%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember