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Share-Based Compensation (Details 2) (Phantom Unit Appreciation Plan, USD $)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2010
Nov. 30, 2009
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2012
item
Sep. 30, 2011
Phantom Unit Appreciation Plan
           
Share-based Compensation            
Number of Phantom Unit Appreciation Plans         2  
Payments to phantom unit holders $ 3,600,000 $ 900,000 $ 9,200,000 $ 20,100,000    
Compensation expense           $ 10,600,000