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Equity-Based Compensation (Tables) (Phantom Units)
 6 Months Ended
Jun. 30, 2013
Phantom Units
  
Phantom Units Activity
The following table presents phantom units activity for the six months ended June 30, 2013:
Phantom Units
Units
 
Weighted Average Grant
Date Fair Value
Outstanding at beginning of period
1,231,342

 
$
23.22

Service condition grants
52,360

 
25.30

Vested service condition
(26,158
)
 
23.98

Forfeited service condition
(23,900
)
 
23.45

Forfeited market condition
(44,397
)
 
19.52

Outstanding at end of period
1,189,247

 
24.43