Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests In Subsidiaries (Narrative) (Details)

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Noncontrolling Interests In Subsidiaries (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Oct. 28, 2011
Series C Preferred Stock [Member]
Dec. 31, 2012
Participation Rights [Member]
Dec. 31, 2012
Future Developments [Member]
Participation Rights [Member]
property
Dec. 31, 2012
Office Buildings [Member]
Participation Rights [Member]
property
sqft
Noncontrolling Interest [Line Items]            
Preferred stock issued     $ 25,000,000      
Preferred unit in operating partnership     25,000,000      
Number of common shares received upon redemption of common units 1          
Rebalance of ownership percentage $ 15,000          
Percentage of noncontrolling interest 12.20% 12.20%        
Number of properties         2 4
Square footage of office buildings           860,246
Excess net cash flow remaining after the distribution to the Company       50.00%    
Internal rate of return       10.00%