XML 59 R46.htm IDEA: XBRL DOCUMENT
v3.23.1

Derivatives - Fair Value Measurements on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
2021 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | $ 15,077 | $ 17,976
2021 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 | 0
2021 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 15,077 | 17,976
2021 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 | 0
2022 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 12,070 | 19,057
2022 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 | 0
2022 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 12,070 | 19,057
2022 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 | 0
2022 Swaps II |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (3,387) | (253)
2022 Swaps II | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | 0 | 0
2022 Swaps II | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (3,387) | (253)
2022 Swaps II | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | $ 0 | $ 0

X
- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fr_A2021InterestRateSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fr_A2022InterestRateSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fr_InterestRateSwap2022SwapsIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |