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Incentive Plan (Long-Term Incentive Units) (Narrative) (Details) (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]          
Long-term incentive units granted     166,080    
Long-Term Incentive Units [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long-term incentive units granted     79,237 85,910  
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%    
Share/unit compensation expense $ 2,100,000 $ 2,200,000 $ 7,200,000 $ 6,600,000  
Capitalized expense related to construction and leasing activities 400,000 200,000 800,000 600,000  
Unearned compensation $ 15,400,000   $ 15,400,000   $ 12,700,000
Unearned compensation, period of recognition     2 years 8 months 12 days    
Service And Performance Condition [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long-term incentive units granted     86,843 98,632  
Minimum [Member] | Long-Term Incentive Units [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Maximum [Member] | Long-Term Incentive Units [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years