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Related Party (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The related payments (receipts) with related parties for the years ended December 31, 2018, 2017, and 2016 were as follows:
December 31, 2018December 31, 2017December 31, 2016
(in thousands)
Payments for tractor purchases— $— $4,300 
Receipts for trailer sales— (12)(108)
Revenue equipment lease payments— — 813 
Payments for parts and services551 650 1,300 
Terminal lease payments713 1,625 1,849 
1,264 2,263 $8,154