XML 66 R68.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Earnings Per Share (EPS) (Details Textual) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Earnings Per Share (EPS) (Textual) [Abstract] |  |  |
Unvested Restricted Stock Awards Outstanding | 673,381 | 662,092 | 355,645

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

X
- Definition Number of unvested restricted stock awards outstanding included in participating securities. + References No definition available. + Details
Name: | fr_NumberOfUnvestedRestrictedStockAwardsOutstandingIncludedInParticipatingSecurities
Namespace Prefix: | fr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant