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Share and Unit-Based Plans - Compensation Cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share and unit-based plans        
Compensation cost under share and unit-based plans $ 4,983 $ 5,790 $ 30,103 $ 16,658
LTIP Units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 3,465 4,743 25,133 12,393
Stock awards
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 84 121 281 353
Stock units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 1,134 674 3,775 3,165
Stock options
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 4 4 12 12
Phantom stock units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans $ 296 $ 248 $ 902 $ 735