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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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 years ended December 31, 2016, 2015 and 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

Granted
 
11,836

 
$
39.73

Vested
 
(82,228
)
 
$
23.55

Non-vested
December 31, 2015
145,072

 
$
24.76

Granted
 
12,475

 
$
26.05

Vested
 
(69,094
)
 
$
24.66

Forfeited
 
(14,500
)
 
$
22.65

Non-vested
December 31, 2016
73,953

 
$
25.49