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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
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares granted 61,290 42,720  
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 $ 0.7 $ 0.7  
Capitalized expense related to construction and leasing activities 0.6 0.4  
Unearned compensation $ 13.4   $ 7.4
Unearned compensation, period of recognition 3 years 3 months 18 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