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Segment Reporting (Tables)
6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
(Dollars in thousands)
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Revenues from External Customers
 
 
 
 
 
 
 
Freight
$
881,824

 
$
865,058

 
$
1,698,960

 
$
1,683,699

Logistics
353,528

 
436,207

 
732,256

 
845,008

Truckload
144,490

 
143,715

 
282,839

 
281,472

Corporate and Eliminations
1,528

 
1,116

 
3,479

 
2,078

 
$
1,381,370

 
$
1,446,096

 
$
2,717,534

 
$
2,812,257

Revenues from Internal Customers
 

 
 

 
 
 
 
Freight
$
10,451

 
$
13,466

 
$
20,851

 
$
25,872

Logistics
16,850

 
11,822

 
30,479

 
22,167

Truckload
17,314

 
19,205

 
35,968

 
38,771

Corporate and Eliminations
16,393

 
13,520

 
31,045

 
26,849

 
$
61,008

 
$
58,013

 
$
118,343

 
$
113,659

Operating Income (Loss)
 

 
 

 
 
 
 
Freight
$
54,689

 
$
53,429

 
70,713

 
87,931

Logistics
6,039

 
12,688

 
12,571

 
24,982

Truckload
10,873

 
14,619

 
20,828

 
25,169

Corporate and Eliminations
4,698

 
(593
)
 
3,786

 
(2,249
)
 
$
76,299

 
$
80,143

 
$
107,898

 
$
135,833