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Debt (Details 2) (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
Not recorded at fair value    
Debt    
Fixed-rate debt 366,627us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
329,544us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Fair Value | Level 2 - Market approach    
Debt    
Fixed-rate debt 353,076us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
319,429us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carried at fair value    
Debt    
Variable-rate debt $ 103,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember
$ 104,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember