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Unit-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Schedule of Nonvested Share Activity
A summary of our phantom unit award activity is as follows:
 
Number of Phantom Common Units
 
Weighted-Average Grant Date Fair Value
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

Granted
420,300

 
28.86

Vested
(169,996
)
 
28.18

Forfeited
(214,344
)
 
31.93

Outstanding at March 31, 2018
1,813,261

 
$
30.96