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Related Party (Tables)
6 Months Ended
Jun. 30, 2019
Related Party [Abstract]  
Schedule of Related Party Transactions [Table Text Block]

The payments with related parties for the three and six months ended June 30, 2019 and 2018 (in thousands) were as follows:

 
Three months ended June 30,
 
2019
 
2018
Payments for parts and services
$
145

 
$
145

Terminal lease payments

 
214

 
$
145

 
$
359


 
Six months ended June 30,
 
2019
 
2018
Payments for parts and services
$
225

 
$
281

Terminal lease payments

 
461

 
$
225

 
$
742