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Incentive Plan (Restricted Stock) (Narrative) (Details) (Restricted Stock [Member], USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted     67,660 45,184  
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 $ 0.8 $ 1.4      
Capitalized expense related to construction and leasing activities 1.3 0.9 0.7 0.5  
Unearned compensation $ 12.3   $ 12.3   $ 7.4
Unearned compensation, period of recognition     3 years 1 month 6 days    
Service And Performance Condition [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted     69,995 52,947  
Number of shares satisfying the performance conditions     49,325    
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