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Note 3. Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
 
Three Months Ended
March 31,
(Dollars in thousands)
2015
 
2014
Revenue from External Customers
 
 
 
Freight
$
846,634

 
$
836,329

Logistics
398,179

 
389,372

Truckload
125,767

 
140,597

Corporate and Eliminations
1,851

 
2,545

 
$
1,372,431

 
$
1,368,843

Revenue from Internal Customers
 
 
 
Freight
$
8,978

 
$
11,698

Logistics
18,891

 
16,993

Truckload
12,958

 
15,413

Corporate and Eliminations
18,290

 
14,390

 
$
59,117

 
$
58,494

Operating Income (Loss)
 
 
 
Freight
$
37,376

 
$
18,565

Logistics
8,616

 
6,174

Truckload
7,561

 
6,380

Corporate and Eliminations
(1,626
)
 
1,943

 
$
51,927

 
$
33,062