SEGMENT INFORMATION - Operating Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net service revenue	$ 550,700	$ 544,100	$ 485,000	$ 491,700	$ 500,700	$ 494,600	$ 493,000	$ 467,300	$ 2,071,519	$ 1,955,633	$ 1,662,578
Other operating income									34,372	0	0
Cost of service, excluding depreciation and amortization									1,185,369	1,150,337	992,863
General and administrative expenses									668,200	607,900	501,300
Depreciation and amortization									28,802	18,428	13,261
Asset impairment charge									4,152	1,470	0
Operating expenses									1,886,623	1,778,161	1,507,430
Operating income (loss)									219,268	177,472	155,148
Home Health [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									1,249,200	1,256,400	1,174,500
Other operating income									20,200
Cost of service, excluding depreciation and amortization									729,900	754,100	722,100
General and administrative expenses									307,200	297,200	276,300
Depreciation and amortization									3,900	4,200	3,500
Asset impairment charge									3,400	1,500
Operating expenses									1,044,400	1,057,000	1,001,900
Operating income (loss)									225,000	199,400	172,600
Hospice [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									750,100	617,200	410,900
Other operating income									13,100
Cost of service, excluding depreciation and amortization									400,600	335,100	212,000
General and administrative expenses									175,400	137,500	84,600
Depreciation and amortization									2,200	1,600	1,100
Asset impairment charge									800	0
Operating expenses									579,000	474,200	297,700
Operating income (loss)									184,200	143,000	113,200
Personal Care [Member]
Segment Reporting Information [Line Items]
Other operating income									1,000
Personal Care [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									72,200	82,000	77,200
Other operating income									1,100
Cost of service, excluding depreciation and amortization									54,900	61,100	58,800
General and administrative expenses									12,400	12,300	12,800
Depreciation and amortization									200	200	300
Asset impairment charge									0	0
Operating expenses									67,500	73,600	71,900
Operating income (loss)									5,800	8,400	5,300
Other [Member] | Other Segment [Member]
Segment Reporting Information [Line Items]
Net service revenue									0	0	0
Other operating income									0
Cost of service, excluding depreciation and amortization									0	0	0
General and administrative expenses									173,200	160,900	127,600
Depreciation and amortization									22,500	12,400	8,400
Asset impairment charge									0	0
Operating expenses									195,700	173,300	136,000
Operating income (loss)									$ (195,700)	$ (173,300)	$ (136,000)