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Share and Unit-Based Plans - Compensation Cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share and unit-based plans        
Compensation cost under share and unit-based plans $ 4,854 $ 5,731 $ 25,200 $ 10,868
LTIP Units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 3,428 4,692 21,668 7,650
Stock awards
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 83 122 197 232
Stock units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 1,039 667 2,721 2,491
Stock options
       
Share and unit-based plans        
Compensation cost under share and unit-based plans 4 4 8 8
Phantom stock units
       
Share and unit-based plans        
Compensation cost under share and unit-based plans $ 300 $ 246 $ 606 $ 487