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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite-lived intangibles    
Finite-lived intangibles, Cost $ 271,594 $ 254,593
Accumulated Amortization (165,702) (156,246)
Finite-lived intangibles, Net 105,892 98,347
Indefinite-lived intangibles    
Indefinite-lived intangibles 10,475 10,475
Total intangibles, Cost 282,069 265,068
Total intangibles, Net 116,367 108,822
Customer relationships    
Finite-lived intangibles    
Finite-lived intangibles, Cost 271,294 254,293
Accumulated Amortization (165,447) (156,006)
Finite-lived intangibles, Net 105,847 98,287
Non-competition agreements    
Finite-lived intangibles    
Finite-lived intangibles, Cost 300 300
Accumulated Amortization (255) (240)
Finite-lived intangibles, Net 45 60
Trademarks    
Indefinite-lived intangibles    
Indefinite-lived intangibles $ 10,475 $ 10,475