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Indebtedness (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Apr. 16, 2012 2012 Notes [Member] | Jun. 30, 2012 2028 Notes [Member] | Jun. 30, 2012 Tender Offer Repurchases [Member] | Mar. 29, 2012 Tender Offer Repurchases [Member] | Jun. 30, 2012 Senior Unsecured Debt Repurchase [Member] | Jun. 30, 2012 Senior Unsecured Debt Repurchase [Member] 2028 Notes [Member]
Indebtedness (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of notes paid off and retired at maturity |  |  |  |  | $ 61,829 |  |  |  |  |
Maximum aggregate cash tender offer price |  |  |  |  |  |  |  | 100,000 |  |
Gain/Loss on retirement of debt | (6,223) | (3,233) | (6,222) | (4,259) |  |  | 6,223 |  | 1 |
Purchase price senior unsecured notes |  |  | 89,328 |  |  | 57,041 | 88,922 |  |  | 406
Principal amount repurchased |  |  | 87,355 |  |  | 55,955 | 86,925 |  |  | 430
Unamortized debt issue discount |  |  |  |  |  |  | 578 |  | 0 |
Unamortized loan commitment and origination fee |  |  |  |  |  |  | 609 |  | 3 |
Unamortized settlement amount of interest rate protection agreements |  |  |  |  |  |  | 2,599 |  | 20 |
Professional Service Fee |  |  |  |  |  |  | 440 |  |  |
Indebtedness (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Carrying value of industrial properties held under mortgage and other loan | 875,499 |  | 875,499 |  |  |  |  |  |  |
Letter of credit, amount | $ 537 |  | $ 537 |  |  |  |  |  |  |

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- Definition Maximum aggregate cash tender offer price. + References No definition available. + Details
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- Definition Purchase price senior unsecured notes. + References No definition available. + Details
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