BUSINESS ACQUISITIONS - Consideration Exchanged (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 06, 2019	Mar. 31, 2020	Dec. 31, 2019	Aug. 05, 2019
Business Acquisition [Line Items]
Number of BioScrip common shares outstanding at time of the merger (in shares)		176,704,306	176,591,907
BioScrip
Business Acquisition [Line Items]
Number of BioScrip common shares outstanding at time of the merger (in shares)	132,639,000			129,181,000
Common shares issued to warrant and preferred stockholders at time of the merger (in shares)	3,458,000
BioScrip share price as of August 6, 2019 (in dollars per share)	$ 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