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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 12 Months Ended
Mar. 31, 2014
Dec. 31, 2011
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock expense $ 0.8 $ 0.7  
Capitalized expense related to construction and leasing activities 0.8 0.6  
Unearned compensation $ 15.1   $ 8.7
Unearned compensation, period of recognition 3 years    
Service And Performance Condition [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares granted 69,995    
Number of shares satisfying the performance conditions 50,805    
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