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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill impairment     $ 0   $ 0
Amortization of intangible assets $ 2,375,000 $ 2,447,000 7,918,000 $ 6,038,000  
Cost of sales amortization expenses $ 587,000 $ 437,000 $ 1,461,000 $ 1,171,000