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Unit-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
Phantom unit award activity for the years ended December 31, 2019 and 2018 consisted of the following:
 
Number of Phantom Common Units
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2017
1,777,301

 
$
31.89

Granted
1,072,600

 
27.67

Vested
(414,472
)
 
32.92

Forfeited
(311,417
)
 
31.26

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