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OPERATING LEASES AND COMMITMENTS (Future minimum commitments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases and Commitments      
Rental expense $ 31,700 $ 26,700 $ 25,000
Future minimum rental commitments for all noncancelable operating leases      
2018 17,734    
2019 13,945    
2020 11,312    
2021 8,018    
2022 4,300    
Thereafter 5,231    
Total 60,540    
Land and structures (service centers)      
Future minimum rental commitments for all noncancelable operating leases      
2018 16,088    
2019 12,874    
2020 10,365    
2021 7,706    
2022 4,300    
Thereafter 5,231    
Total 56,564    
Equipment and other      
Future minimum rental commitments for all noncancelable operating leases      
2018 1,646    
2019 1,071    
2020 947    
2021 312    
Total $ 3,976