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Incentive Plan (Restricted Stock) (Narrative) (Details) (Restricted Stock [Member], USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted     45,184 41,220  
Service conditions of the awards     The service conditions of the awards provide for 20% vesting on each of the first and second anniversaries of the grant date and 30% vesting on each of the third and fourth anniversaries of the grant date provided the grantee continues employment on each anniversary date.    
Vesting percentage, first and second anniversaries     20.00%    
Vesting percentage, third and fourth anniversaries     30.00%    
Restricted stock expense $ 600,000 $ 500,000 $ 2,100,000 $ 1,500,000  
Capitalized expense related to construction and leasing activities 600,000 400,000 1,500,000 1,100,000  
Unearned compensation $ 8,800,000   $ 8,800,000   $ 5,500,000
Unearned compensation, period of recognition     2 years 10 months 24 days    
Service And Performance Condition [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted     52,947 50,999  
Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years