ACQUISITIONS & DIVESTITURES (Details) - USD ($)			3 Months Ended			9 Months Ended
	Sep. 14, 2018	Jul. 12, 2017	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Business Acquisition [Line Items]
Loss on divestiture of business			$ 0		$ 0	$ 9,177,000	$ 0
Goodwill			1,715,523,000			1,715,523,000		$ 1,712,764,000
Efflux
Business Acquisition [Line Items]
Estimated purchase price		$ 8,600,000
Goodwill		$ 6,100,000
HNT tools business | Disposed of by Sale
Business Acquisition [Line Items]
Proceeds from divestiture of business	$ 1,300,000
Contingent consideration related to the divestiture	$ 2,300,000		$ 2,300,000			$ 2,300,000
Contingent consideration related to the divestiture, measurement period	2 years
Net liabilities transferred related to divestiture				$ 4,500,000
Loss on divestiture of business				9,200,000
Divestiture transaction costs				1,300,000
Incentive compensation payable related to business divestiture				$ 500,000
Transitional services agreement term	18 months
HNT tools business | Disposed of by Sale | Maximum
Business Acquisition [Line Items]
Contingent consideration related to the divestiture	$ 4,000,000.0