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Note 3. Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(Dollars in thousands)
Three Months Ended
March 31,
 
2014
 
2013
Revenue from External Customers
 
 
 
Freight
$
836,329

 
$
817,136

Logistics
389,372

 
378,728

Truckload
140,597

 
138,349

Corporate and Eliminations
2,545

 
1,951

 
$
1,368,843

 
$
1,336,164

Revenue from Internal Customers
 

 
 

Freight
$
11,698

 
$
10,400

Logistics
16,993

 
13,629

Truckload
15,413

 
18,654

Corporate and Eliminations
14,390

 
14,652

 
$
58,494

 
$
57,335

Operating Income (Loss)
 

 
 

Freight
$
18,565

 
$
16,024

Logistics
6,174

 
6,532

Truckload
6,380

 
9,955

Corporate and Eliminations
1,943

 
(912
)
 
$
33,062

 
$
31,599