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GOODWILL AND OTHER INTANGIBLE ASSETS, Finite-lived intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 164,858 $ 197,395  
Accumulated amortization (70,027) (85,098)  
Carrying amount, net 94,831 112,297 $ 130,333
Amortization expense 18,061 20,621 $ 22,480
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract]      
2017 17,209    
2018 15,558    
2019 14,114    
2020 10,680    
2021 8,427    
Thereafter 28,843    
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 163,022 195,580  
Accumulated amortization (68,446) (83,741)  
Carrying amount, net $ 94,576 111,839  
Weighted average remaining estimated life 9 years 2 months 12 days    
Non-Compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 1,836 1,815  
Accumulated amortization (1,581) (1,357)  
Carrying amount, net $ 255 $ 458  
Weighted average remaining estimated life 2 years 4 months 24 days