Subsequent Events	3 Months Ended
Mar. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	11. Subsequent Events From April 1, 2012 to May 7, 2012, we sold four industrial properties for approximately $3,750. There were no industrial properties acquired during this period. On April 16, 2012, we paid off and retired our 2012 Notes, at maturity, in the amount of $61,829. On March 29, 2012, we announced a cash tender offer to purchase up to an aggregate of $100,000 of our 2014 Notes, 2027 Notes, 2028 Notes and 2032 Notes. The early tender period ended on April 11, 2012 and the extended tender offer period expired on April 25, 2012. During the early and extended tender offer periods, we purchased $9,000 of our 2014 Notes, $55,525 of our 2028 Notes and $22,400 of our 2032 Notes for total consideration of $88,922. The early tender premium along with the write off of unamortized loan fees and the unamortized settlement amount of the interest rate protection agreements, as well as third party transaction costs, will be recognized as a loss on retirement of debt during the three months ended June 30, 2012. On August 24, 2009, we received a private letter ruling from the IRS granting favorable loss treatment under Sections 331 and 336 of the Code on the tax liquidation of one of our old taxable REIT subsidiaries. On November 6, 2009, legislation was signed that allowed businesses with net operating losses for 2008 or 2009 to carry back those losses for up to five years. As a result, we received a refund from the IRS of $40,418 in the fourth quarter of 2009 (the “Refund”) in connection with this tax liquidation. The IRS examination team, which is required by statute to review all refund claims in excess of $2,000 on behalf of the Joint Committee on Taxation, has indicated to us, on a preliminary basis, that it disagrees with certain of the property valuations we obtained from an independent valuation expert in support of our fair value of the liquidated taxable REIT subsidiary and our claim for the Refund. If we are unable to agree with the IRS on valuation, we expect the IRS to formally propose an adjustment. While we would need to evaluate any proposed adjustment, we currently intend to contest any proposed adjustment, and there can be no assurance that we would succeed. If the IRS succeeds in asserting any amount of a proposed adjustment, then our tax loss and the Refund would be reduced accordingly and, as a result, we would owe some amount of taxes, interest and possible penalties to the relevant taxing authorities, which we expect not to exceed the amount of the Refund in any event. The amount of loss, if any, which we may incur upon resolution with the IRS is not estimable at this time.

Subsequent Events

3 Months Ended

Mar. 31, 2012

11. Subsequent Events

From April 1, 2012 to May 7, 2012, we sold four industrial properties for approximately $3,750. There were no industrial properties acquired during this period.

On April 16, 2012, we paid off and retired our 2012 Notes, at maturity, in the amount of $61,829.

On March 29, 2012, we announced a cash tender offer to purchase up to an aggregate of $100,000 of our 2014 Notes, 2027 Notes, 2028 Notes and 2032 Notes. The early tender period ended on April 11, 2012 and the extended tender offer period expired on April 25, 2012. During the early and extended tender offer periods, we purchased $9,000 of our 2014 Notes, $55,525 of our 2028 Notes and $22,400 of our 2032 Notes for total consideration of $88,922. The early tender premium along with the write off of unamortized loan fees and the unamortized settlement amount of the interest rate protection agreements, as well as third party transaction costs, will be recognized as a loss on retirement of debt during the three months ended June 30, 2012.

On August 24, 2009, we received a private letter ruling from the IRS granting favorable loss treatment under Sections 331 and 336 of the Code on the tax liquidation of one of our old taxable REIT subsidiaries. On November 6, 2009, legislation was signed that allowed businesses with net operating losses for 2008 or 2009 to carry back those losses for up to five years. As a result, we received a refund from the IRS of $40,418 in the fourth quarter of 2009 (the “Refund”) in connection with this tax liquidation. The IRS examination team, which is required by statute to review all refund claims in excess of $2,000 on behalf of the Joint Committee on Taxation, has indicated to us, on a preliminary basis, that it disagrees with certain of the property valuations we obtained from an independent valuation expert in support of our fair value of the liquidated taxable REIT subsidiary and our claim for the Refund. If we are unable to agree with the IRS on valuation, we expect the IRS to formally propose an adjustment. While we would need to evaluate any proposed adjustment, we currently intend to contest any proposed adjustment, and there can be no assurance that we would succeed. If the IRS succeeds in asserting any amount of a proposed adjustment, then our tax loss and the Refund would be reduced accordingly and, as a result, we would owe some amount of taxes, interest and possible penalties to the relevant taxing authorities, which we expect not to exceed the amount of the Refund in any event. The amount of loss, if any, which we may incur upon resolution with the IRS is not estimable at this time.