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OPERATING LEASES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING LEASES      
Rental expense $ 23,200,000 $ 22,200,000 $ 19,500,000
Future minimum rental commitments for all noncancelable operating leases      
2013 14,218,000    
2014 11,876,000    
2015 9,053,000    
2016 6,243,000    
2017 4,584,000    
Thereafter 12,784,000    
Total 58,758,000    
Terminals
      
Future minimum rental commitments for all noncancelable operating leases      
2013 12,576,000    
2014 10,584,000    
2015 8,566,000    
2016 6,231,000    
2017 4,574,000    
Thereafter 12,784,000    
Total 55,315,000    
Equipment and Other
      
Future minimum rental commitments for all noncancelable operating leases      
2013 1,642,000    
2014 1,292,000    
2015 487,000    
2016 12,000    
2017 10,000    
Total $ 3,443,000