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OPERATING LEASES AND COMMITMENTS (Future minimum commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Leases and Commitments      
Rental expense $ 26,700 $ 25,000 $ 30,200
Future minimum rental commitments for all noncancelable operating leases      
2017 17,961    
2018 14,519    
2019 11,965    
2020 9,648    
2021 6,394    
Thereafter 5,670    
Total 66,157    
Land and structures (terminals)      
Future minimum rental commitments for all noncancelable operating leases      
2017 15,917    
2018 12,865    
2019 10,892    
2020 8,688    
2021 6,078    
Thereafter 5,670    
Total 60,110    
Equipment and other      
Future minimum rental commitments for all noncancelable operating leases      
2017 2,044    
2018 1,654    
2019 1,073    
2020 960    
2021 316    
Total $ 6,047