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Unit-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Nonvested Share Activity
Phantom unit award activity for the years ended December 31, 2017 and December 31, 2016 consisted of the following:
 
Number of Phantom Common Units
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2015
1,147,048

 
$
41.19

Granted
966,337

 
26.95

Vested
(1,240
)
 
36.98

Forfeited
(98,511
)
 
39.77

Outstanding at December 31, 2016
2,013,634

 
34.43

Granted
203,867

 
28.31

Vested
(289,377
)
 
45.48

Forfeited
(150,823
)
 
34.71

Outstanding at December 31, 2017
1,777,301

 
$
31.89