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GOODWILL AND OTHER INTANGIBLE ASSETS - Components of Company's Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 1,400,869 |  | $ 1,416,615
Accumulated Amortization | (303,610) |  | (256,988)
Net | 1,097,259 |  | 1,159,627
Trade Names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 162,900 |  | 162,900
Net | $ 162,900 |  | 162,900
Completed technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life | 19 years | 19 years |
Cost | $ 855,799 |  | 869,174
Accumulated Amortization | (156,157) |  | (124,096)
Net | $ 699,642 |  | 745,078
Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life | 13 years | 13 years |
Cost | $ 232,083 |  | 233,430
Accumulated Amortization | (102,618) |  | (91,961)
Net | $ 129,465 |  | 141,469
Trademarks/brand names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life | 28 years | 28 years |
Cost | $ 104,347 |  | 104,879
Accumulated Amortization | (24,903) |  | (22,293)
Net | $ 79,444 |  | 82,586
Supplier relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life | 27 years | 27 years |
Cost | $ 34,721 |  | 34,721
Accumulated Amortization | (16,162) |  | (15,092)
Net | $ 18,559 |  | 19,629
All other |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life | 4 years | 4 years |
Cost | $ 11,019 |  | 11,511
Accumulated Amortization | (3,770) |  | (3,546)
Net | $ 7,249 |  | $ 7,965

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