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Stockholders' Equity of the REIT (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common Stock Issued      
1999 Dividend Reinvestment Plan   54 100
Controlled Offering Program   978 13,284
Incentive Plan and Outside Trustees Plan 793 617 788
Employee Share Plan   76 87
Total 793 1,725 14,259