BUSINESS ACQUISITIONS - Acquired Identifiable Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 1,477,564	$ 1,428,610	$ 1,425,542		$ 632,469
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				(66,668)
Other assumed liabilities, net of other acquired assets				(20,663)
Total acquired identifiable assets and liabilities				291,073
Goodwill				796,141
Total consideration transferred				$ 1,087,214