BUSINESS ACQUISITIONS - Acquired Identifiable Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,425,542		$ 632,469	$ 627,392
BioScrip
Business Acquisition [Line Items]
Accounts receivable, net		$ 96,532
Inventories		19,683
Property and equipment, net		48,732
Intangible assets, net		193,245
Deferred tax assets, net of deferred tax liabilities		26,731
Operating lease right-of-use asset		22,378
Operating lease liability		(28,897)
Accounts payable		(64,030)
Other assumed liabilities, net of other acquired assets		(20,233)
Total acquired identifiable assets and liabilities		294,141
Goodwill		793,073
Total consideration transferred		$ 1,087,214