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Unit-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table presents the phantom unit activity under the LTIP for the three months ended March 31, 2018:
 
Phantom
Units
 
Weighted Average
Grant-Date
Fair Value
Unvested at December 31, 2017
105,439

 
$
17.10

Granted
101,403

 
$
23.18

Vested
(39,147
)
 
$
22.30

Unvested at March 31, 2018
167,695

 
$
19.56