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Note 3. Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(Dollars in thousands)
2014
 
2013
 
2014
 
2013
Revenue from External Customers
 
 
 
 
 
 
 
Freight
$
934,313

 
$
888,508

 
$
2,698,584

 
$
2,587,468

Logistics
422,645

 
362,830

 
1,225,847

 
1,095,086

Truckload
145,320

 
144,583

 
434,847

 
427,422

Corporate and Eliminations
1,872

 
2,100

 
6,064

 
5,579

 
$
1,504,150

 
$
1,398,021

 
$
4,365,342

 
$
4,115,555

Revenue from Internal Customers
 

 
 

 
 
 
 
Freight
$
11,993

 
$
10,746

 
$
36,252

 
$
31,597

Logistics
21,300

 
17,719

 
58,113

 
48,198

Truckload
13,866

 
17,596

 
44,413

 
53,564

Corporate and Eliminations
18,367

 
18,410

 
49,909

 
49,455

 
$
65,526

 
$
64,471

 
$
188,687

 
$
182,814

Operating Income (Loss)
 

 
 

 
 
 
 
Freight
$
71,889

 
$
51,570

 
$
173,475

 
$
122,283

Logistics
7,602

 
8,178

 
20,194

 
20,749

Truckload
10,694

 
8,971

 
30,573

 
29,799

Corporate and Eliminations
1,190

 
(1,044
)
 
2,895

 
2,742

 
$
91,375

 
$
67,675

 
$
227,137

 
$
175,573