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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Phantom Units Award Activity
A summary of our unit award activity for the years ended December 31, 2017, 2016 and 2015, is set forth below:
 
 
 
Number of Phantom Units
 
Weighted-Average Grant Price
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

Granted
 
10,090

 
$
32.20

Vested
 
(68,079
)
 
$
24.60

Non-vested
December 31, 2017
15,964

 
$
33.54