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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
A summary of our unit award activity for the three years ended December 31, 2016, is set forth below:
 
Number of Phantom Units
 
Weighted Average
Grant Date
Fair Value
Not vested at December 31, 2013
10,908

 
$
22.00

Awards granted
293,810

 
28.52

Awards vested
(10,908
)
 
22.00

Awards forfeited
(13,559
)
 
33.02

Not vested at December 31, 2014
280,251

 
28.30

Awards granted
72,005

 
28.33

Awards vested
(60,556
)
 
28.95

Awards forfeited
(11,913
)
 
30.78

Not vested at December 31, 2015
279,787

 
28.06

Awards granted
101,955

 
22.69

Awards vested
(86,406
)
 
25.80

Awards forfeited
(10,181
)
 
31.87

Not vested at December 31, 2016
285,155

 
26.42