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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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

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