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Summary of Accounting Policies Results of Operations for Acquisitions (Tables)
 9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Acquisition results [Table Text Block] For the quarter and nine months ended September 30, 2019, these acquisitions generated the following operating revenue and income:
 
Three Months Ended September 30, 2019
 
Nine Months Ended
September 30, 2019
 
Operating Revenue
 
Operating Income
 
Operating Revenue
 
Operating Income
(in thousands)
 
 
 
 
 
 
 
Marlin Gas Services
$
1,059

 
$
68

 
$
4,601

 
$
1,491

Ohl propane acquisition
$
149

 
$
(35
)
 
$
1,146

 
$
177