XML 96 R69.htm IDEA: XBRL DOCUMENT v2.4.0.6
Incentive Plan (Long-Term Incentive Units) (Narrative) (Details) (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]      
Long-term incentive units granted 175,068    
Long-Term Incentive Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Long-term incentive units granted 79,260 72,377  
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 $ 2.2 $ 2.2  
Capitalized expense related to construction and leasing activities 0.4 0.2  
Unearned compensation $ 21.8   $ 13.3
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]      
Long-term incentive units granted 95,316 86,843  
Service And Performance Condition [Member] | Long-Term Incentive Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares satisfying the performance conditions 78,118    
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