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