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Unit-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of the Company's nonvested phantom units
A summary of the Company’s non-vested phantom units and performance units as of December 31, 2019, and the changes during the years ended December 31, 2019, 2018 and 2017, are presented below:
 
Number of
Phantom Units
 
Weighted-Average
Grant Date
Fair Value
Non-vested at January 1, 2017
754,833

 
$
9.58

Granted
2,753,507

 
4.10

Vested
(925,199
)
 
7.30

Forfeited
(47,363
)
 
9.73

Non-vested at December 31, 2017
2,535,778

 
$
3.11

Granted
1,030,174

 
6.29

Vested
(1,175,363
)
 
6.97

Forfeited
(120,082
)
 
6.83

Non-vested at December 31, 2018
2,270,507

 
$
5.71

Granted
1,653,340

 
3.01

Vested
(883,511
)
 
4.28

Forfeited
(139,048
)
 
4.10

Non-vested at December 31, 2019
2,901,288

 
$
5.21