Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Mar. 31, 2020	Mar. 03, 2020	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,237,672,000	$ 1,203,197,000			$ 17,279,000
Impairment losses	0	$ 0
Paradigm & Viomics
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 30,400,000	$ 30,431,000
Merger Agreement with Genomic Health, Inc.
Finite-Lived Intangible Assets [Line Items]
Genomic Health acquisition adjustment	$ 4,044,000