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Equity-Based Compensation (Tables) (Phantom Units)
 9 Months Ended
Sep. 30, 2013
Phantom Units
  
Phantom Units Activity
The following table presents phantom units activity for the nine months ended September 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
(45,158
)
 
24.34

Forfeited service condition
(25,900
)
 
23.29

Forfeited market condition
(44,397
)
 
19.52

Outstanding at end of period
1,168,247

 
$
23.41