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Equity-Based Compensation (Tables) (Phantom Units [Member])
 6 Months Ended
Jun. 30, 2012
Phantom Units [Member]
  
Phantom Units Activity
The following table presents phantom units activity for the six months ended June 30, 2012:
Phantom Units
Units
 
Weighted Average Grant
Date Fair Value
Outstanding at beginning of period
1,086,393

 
$
24.51

Service condition grants
7,250

 
24.40

Vested service condition
(23,553
)
 
22.96

Vested market condition
(10,200
)
 
19.52

Forfeited service condition
(64,934
)
 
24.90

Forfeited market condition
(3,750
)
 
19.52

Outstanding at end of period
991,206

 
24.59