BUSINESS ACQUISITIONS - Consideration Exchanged (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Feb. 03, 2020	Aug. 06, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Aug. 05, 2019 shares
Business Acquisition [Line Items]
Number of BioScrip common shares outstanding at time of the merger (in shares) | shares			176,591,907	142,613,749
Fair value of total consideration acquired, net of cash acquired			$ 700,170	$ 10,727	$ 0
BioScrip
Business Acquisition [Line Items]
Number of BioScrip common shares outstanding at time of the merger (in shares) | shares		132,639,000				129,181,000
Common shares issued to warrant and preferred stockholders at time of the merger (in shares) | shares		3,458,000
BioScrip share price as of August 6, 2019 (in dollars per share) | $ / shares		$ 2.67
Fair value of common shares		$ 354,146
Fair value of share-based instruments		32,898
Cash paid in conjunction with the Merger included in purchase consideration		714,957
Fair value of total consideration transferred		1,102,001
Less: cash acquired		14,787
Fair value of total consideration acquired, net of cash acquired		$ 1,087,214
Subsequent Event
Business Acquisition [Line Items]
Stock conversion ratio	0.25