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BUSINESS ACQUISITIONS AND DIVESTITURE - KWS BioTest Limited Additional Information (Details) - KWS BioTest Limited $ in Thousands, £ in Millions		3 Months Ended	6 Months Ended
	Jan. 11, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jan. 11, 2018 GBP (£)
Business Acquisition [Line Items]
Purchase price	$ 20,300
Undiscounted contingent payments	4,000			£ 3.0
Purchase price allocation	22,034
Cash acquired	$ 1,000
Integration related costs and transaction costs		$ 100	$ 500
Client relationships
Business Acquisition [Line Items]
Weighted average amortization life of intangible assets acquired			12 years

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