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Unit-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Nonvested Share Activity
A summary of our phantom unit award activity is as follows:
 
Number of Phantom Units
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2018
2,124,012

 
$
29.15

Granted
655,630

 
30.70

Vested
(477,256
)
 
30.04

Forfeited
(189,064
)
 
28.16

Outstanding at December 31, 2019
2,113,322

 
29.21

Granted
17,235

 
29.77

Vested
(49,361
)
 
34.32

Forfeited
(5,816
)
 
28.96

Outstanding at March 31, 2020
2,075,380

 
$
29.10