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Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2012
Segment Reporting [Abstract]  
Operating Income (Loss)
(Dollars in thousands)
 
Three Months Ended
March 31,
 
   
2012
   
2011
 
Revenues before Inter-segment Eliminations
           
Freight
  $ 831,047     $ 767,741  
Logistics
    419,146       369,975  
Truckload
    157,323       145,215  
Other
    14,291       11,997  
Inter-segment Revenue Eliminations
    (55,646 )     (49,301 )
    $ 1,366,161     $ 1,245,627  
                 
Inter-segment Revenue Eliminations
               
Freight
  $ 12,406     $ 11,291  
Logistics
    10,345       6,161  
Truckload
    19,566       20,846  
Other
    13,329       11,003  
    $ 55,646     $ 49,301  
                 
Revenues from External Customers
               
Freight
  $ 818,641     $ 756,450  
Logistics
    408,801       363,814  
Truckload
    137,757       124,369  
Other
    962       994  
    $ 1,366,161     $ 1,245,627  
Operating Income (Loss)
               
Freight
  $ 34,502     $ 20,344  
Logistics
    12,294       8,646  
Truckload
    10,550       7,083  
Other
    (1,656 )     623  
    $ 55,690     $ 36,696