XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.21.2

Derivatives - Fair Value Measurements on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
2015 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | $ (5,167) | $ (7,317)
2015 Swaps | 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
2015 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (5,167) | (7,317)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | 0 | 0
2021 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (1,885) | (6,244)
2021 Swaps | 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
2021 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (1,885) | (6,244)
2021 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | $ 0 | 0
2014 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value |  | (333)
2014 Swaps | 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
2014 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value |  | (333)
2014 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value |  | 0
2020 Swap |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | (106)
2020 Swap | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | 0
2020 Swap | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | (106)
2020 Swap | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | $ 0

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 http://asc.fasb.org/extlink&oid=121590274&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
- Definition Fair value of all derivative liabilities not designated as a hedging instrument. + References No definition available. + Details
Name: | us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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