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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

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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