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Related Party Transactions Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2019
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes the revenues from related companies on our consolidated statements of operations:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Revenues from related companies
$
136

 
$
120

 
$
245

 
$
222

The following table summarizes the accounts receivable from related companies on our consolidated balance sheets:
 
June 30, 2019
 
December 31, 2018
Accounts receivable from related companies:
 
 
 
FGT
$
32

 
$
25

Phillips 66
47

 
42

Other
32

 
44

Total accounts receivable from related companies
$
111

 
$
111