Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling Interests In Subsidiaries (Narrative) (Details)

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Noncontrolling Interests In Subsidiaries (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Internal rate of return 10.00%  
Preferred stock issued   $ 25,000,000
Rebalance of ownership percentage 9,400,000  
Percentage of noncontrolling interest 12.80% 14.00%
Excess net cash flow remaining after the distribution to the Company 50.00%  
Square footage of office buildings 860,246  
Series C Cumulative Redeemable Perpetual Preferred Stock [Member]
   
Preferred stock issued 25,000,000  
Series C Preferred Stock [Member]
   
Preferred unit in operating partnership $ 25,000,000