SEGMENT INFORMATION - Operating Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net service revenue	$ 500,700	$ 494,600	$ 493,000	$ 467,300	$ 434,400	$ 417,300	$ 411,600	$ 399,300	$ 1,955,633	$ 1,662,578	$ 1,511,272
Cost of service, excluding depreciation and amortization									1,150,337	992,863	903,377
General and administrative expenses									607,900	501,300	482,300
Depreciation and amortization									18,428	13,261	17,123
Securities Class Action Lawsuit settlement, net									0	0	28,712
Asset impairment charge									1,470	0	1,323
Operating expenses									1,778,161	1,507,430	1,432,748
Operating income (loss)									177,472	155,148	78,524
Home Health [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									1,256,400	1,174,500	1,083,900
Cost of service, excluding depreciation and amortization									754,100	722,100	670,900
General and administrative expenses									297,200	276,300	278,400
Depreciation and amortization									4,200	3,500	3,500
Securities Class Action Lawsuit settlement, net											0
Asset impairment charge									1,500		1,300
Operating expenses									1,057,000	1,001,900	954,100
Operating income (loss)									199,400	172,600	129,800
Hospice [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									617,200	410,900	367,800
Cost of service, excluding depreciation and amortization									335,100	212,000	187,500
General and administrative expenses									137,500	84,600	76,600
Depreciation and amortization									1,600	1,100	900
Securities Class Action Lawsuit settlement, net											0
Asset impairment charge									0		0
Operating expenses									474,200	297,700	265,000
Operating income (loss)									143,000	113,200	102,800
Personal Care [Member] | Reportable Business Segments [Member]
Segment Reporting Information [Line Items]
Net service revenue									82,000	77,200	59,600
Cost of service, excluding depreciation and amortization									61,100	58,800	45,000
General and administrative expenses									12,300	12,800	9,500
Depreciation and amortization									200	300	200
Securities Class Action Lawsuit settlement, net											0
Asset impairment charge									0		0
Operating expenses									73,600	71,900	54,700
Operating income (loss)									8,400	5,300	4,900
Other [Member] | Other Segment [Member]
Segment Reporting Information [Line Items]
Net service revenue									0	0	0
Cost of service, excluding depreciation and amortization									0	0	0
General and administrative expenses									160,900	127,600	117,800
Depreciation and amortization									12,400	8,400	12,500
Securities Class Action Lawsuit settlement, net											28,700
Asset impairment charge									0		0
Operating expenses									173,300	136,000	159,000
Operating income (loss)									$ (173,300)	$ (136,000)	$ (159,000)