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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events On April 5, 2013, we paid off and retired mortgage loans payable originally maturing in March 2015 in the amount of $11,966. On April 11, 2013, we redeemed the remaining 4,000,000 Depositary Shares, each representing 1/10,000th of a share of our 7.25%% Series J Cumulative Redeemable Preferred Stock, $0.01 par value, at a redemption price of $25.00 per Depositary Share, totaling $100,000 plus pro-rated accrued dividends. From April 1, 2013 to May 6, 2013, we acquired land parcels for an aggregate purchase price of $16,629, excluding costs incurred in conjunction with the acquisition. Additionally, we sold three industrial properties for approximately $20,803.