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Equity Based Compensation (Tables)
12 Months Ended
Dec. 31, 2013
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, 2013 is set forth below:

 
 
Number of Phantom Units
 
Weighted-Average Grant Price
Non-vested
January 1, 2013
494,883

 
$
22.65

Granted
 
7,500

 
$
34.12

Vested
 
184,323

 
$
22.68

Forfeited
 
43,108

 
$
22.65

Non-vested
December 31, 2013
274,952

 
$
22.94