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Equity Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Equity Based Compensation [Abstract]  
Schedule of Share-based Compensation, Phantom Units Award Activity [Table Text Block]
A summary of our unit award activity for the twelve months ended December 31, 2014 is set forth below:
 
 
Number of Phantom Units
 
Weighted-Average Grant Price
Non-vested
December 31, 2013
274,952

 
$
22.94

Granted
 
10,000

 
$
35.46

Vested
 
(69,488
)
 
$
23.08

Non-vested
December 31, 2014
215,464

 
$
23.48