SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended	15 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 91,646	$ 91,646	$ 81,808
Restricted cash	1,000	1,000	1,549
Cash, Cash Equivalents and Restricted Cash	92,646	92,646	83,357	$ 180,327	$ 96,490
Cash Balance Associated with Provider Relief Fund	62,000	62,000
Provider relief fund advance	58,328	58,328	$ 60,000
CARES Act Provider Relief Funds Utilized	4,000	46,600
Asana Hospice [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 1,000	$ 1,000