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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable Other Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount $ 169,039 $ 163,149
Accumulated Amortization (97,256) (84,624)
Carrying Amount, net 71,783 78,525
Customer relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount 168,255 162,200
Accumulated Amortization (96,639) (83,806)
Carrying Amount, net 71,616 78,394
Non-compete agreements    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount 784 949
Accumulated Amortization (617) (818)
Carrying Amount, net $ 167 $ 131