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Indebtedness (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012
Repurchased and retired senior unsecured notes prior to maturity |
Principal Amount Repurchased | $ 430
Purchase Price | 406
2028 Notes [Member] |
Repurchased and retired senior unsecured notes prior to maturity |
Principal Amount Repurchased | 430
Purchase Price | $ 406

X
- Definition Principal amount of senior unsecured notes repurchased. + References No definition available. + Details
Name: | fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Purchase price senior unsecured notes. + References No definition available. + Details
Name: | fr_PurchasePriceSeniorUnsecuredNotes
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | fr_RepurchasedAndRetiredSeniorUnsecuredNotesPriorToMaturityAbstract
Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration