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Acquisitions Acquisition (Tables)
 12 Months Ended
Dec. 31, 2019
Acquisition Performance [Abstract]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block] For the year ended December 31, 2019, these acquisitions generated the following operating revenue and income:
 
 
For the Year Ended
 
 
December 31, 2019
 
 
Operating Revenues
 
Operating Income
(in thousands)
 
 
 
 
Marlin Gas Services
 
$
5,702

 
$
1,500

Ohl propane acquisition
 
$
1,662

 
$
385

Boulden acquisition
 
$
550

 
$
239