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Debt (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Debt |  |
Fixed-rate debt | $ 469,604 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount | $ 358,590 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Variable-rate debt | 154,699 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount | 76,999 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Not recorded at fair value |  |
Debt |  |
Fixed-rate debt | 366,627 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember | 329,544 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Fair Value | Level 2 - Market approach |  |
Debt |  |
Fixed-rate debt | 353,076 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 319,429 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carried at fair value |  |
Debt |  |
Variable-rate debt | $ 103,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember | $ 104,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember

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- Details
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Balance Type: | na
Period Type: | duration

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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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- 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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