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Unit-Based Compensation Unit Based Compensation Tables (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
Phantom unit award activity for the years ended December 31, 2018 and 2017 consisted of the following:
 
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
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