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Related Party (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party [Abstract]  
Schedule of Related Party Transactions [Table Text Block]

The related payments (receipts) with related parties for the years ended December 31, 2017, 2016, and 2015 were as follows:
 
December 31, 2017
 
December 31, 2016
 
December 31, 2015
 
(in thousands)
Payments for tractor purchases
$
—

 
$
4,300

 
$
58,599

Receipts for tractor sales
—

 
—

 
(38,064
)
Receipts for trailer sales
(12
)
 
(108
)
 
(28
)
Revenue equipment lease payments
—

 
813

 
3,223

Payments for parts and services
650

 
1,300

 
4,346

Terminal lease payments
1,625

 
1,849

 
3,408

Terminal purchase option payments
—

 
—

 
21,555

 
$
2,263

 
$
8,154

 
$
53,039