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Note 3. Segment Reporting (Tables)
6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(Dollars in thousands)
2014
 
2013
 
2014
 
2013
Revenue from External Customers
 
 
 
 
 
 
 
Freight
$
927,942

 
$
881,824

 
$
1,764,271

 
$
1,698,960

Logistics
413,830

 
353,528

 
803,202

 
732,256

Truckload
148,930

 
144,490

 
289,527

 
282,839

Corporate and Eliminations
1,647

 
1,528

 
4,192

 
3,479

 
$
1,492,349

 
$
1,381,370

 
$
2,861,192

 
$
2,717,534

Revenue from Internal Customers
 

 
 

 
 
 
 
Freight
$
12,561

 
$
10,451

 
$
24,259

 
$
20,851

Logistics
19,820

 
16,850

 
36,813

 
30,479

Truckload
15,134

 
17,314

 
30,547

 
35,968

Corporate and Eliminations
17,152

 
16,393

 
31,542

 
31,045

 
$
64,667

 
$
61,008

 
$
123,161

 
$
118,343

Operating Income (Loss)
 

 
 

 
 
 
 
Freight
$
83,021

 
$
54,689

 
101,586

 
70,713

Logistics
6,418

 
6,039

 
12,592

 
12,571

Truckload
13,499

 
10,873

 
19,879

 
20,828

Corporate and Eliminations
(238
)
 
4,698

 
1,705

 
3,786

 
$
102,700

 
$
76,299

 
$
135,762

 
$
107,898