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Equity-Based Compensation
9 Months Ended
Sep. 30, 2013
Share-based Compensation [Abstract]  
Share-Based Compensation
Equity-Based Compensation
Unit-based compensation expense related to the Partnership and stock-based compensation expense allocated to our Predecessor that was included in our Consolidated Statements of Operations was as follows (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2012
 
September 30, 2013
 
September 30, 2012
 
September 30, 2013
 
Predecessor
 
 
 
Predecessor
 
 
Phantom common units
$
6

 
$
101

 
$
6

 
$
407

Predecessor allocated expense
241

 

 
810

 

SUSS allocated expense

 
445

 

 
944

Total equity-based compensation expense
$
247

 
$
546

 
$
816

 
$
1,351



Phantom Common Unit Awards
During the third quarter of 2013, 3,674 grants were issued. The fair value of each phantom unit on the grant date is based on the market price of our common unit on that date. The estimated fair value of our phantom units is amortized over the vesting period using the straight-line method. Non-employee director awards vest over a one to three-year period and employee awards vest ratably over a two to five-year service period. The fair value of nonvested service phantom units outstanding as of September 30, 2013, totaled $0.9 million which will be amortized to expense over the requisite service period.
A summary of our phantom unit award activity is set forth below:
 
Number of Phantom Common Units
 
Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2011

 
$

Granted
32,500

 
18.93

Nonvested at December 31, 2012
32,500

 
18.93

Granted
15,813

 
27.15

Vested
(7,834
)
 
19.12

Nonvested at September 30, 2013
40,479

 
$
22.10