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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-lived intangibles    
Finite-lived intangibles, Cost $ 275,543 $ 254,593
Accumulated Amortization (175,149) (156,246)
Finite-lived intangibles, Net 100,394 98,347
Indefinite-lived intangibles    
Indefinite-lived intangibles 10,475 10,475
Total intangibles, Cost 286,018 265,068
Total intangibles, Net 110,869 108,822
Customer relationships    
Finite-lived intangibles    
Finite-lived intangibles, Cost 275,243 254,293
Accumulated Amortization (174,879) (156,006)
Finite-lived intangibles, Net 100,364 98,287
Non-competition agreements    
Finite-lived intangibles    
Finite-lived intangibles, Cost 300 300
Accumulated Amortization (270) (240)
Finite-lived intangibles, Net 30 60
Trademarks    
Indefinite-lived intangibles    
Indefinite-lived intangibles $ 10,475 $ 10,475