SEGMENT INFORMATION - Operating Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net service revenue	$ 411,603	$ 374,946	$ 810,865	$ 739,607
Cost of service, excluding depreciation and amortization	242,564	220,541	480,873	436,870
General and administrative expenses	123,100	121,000	244,500	239,600
Depreciation and amortization	3,125	4,537	6,718	8,954
Securities Class Action Lawsuit settlement, net	0	28,712	0	28,712
Operating expenses	368,775	374,706	732,032	714,202
Operating income	42,828	240	78,833	25,405
Home Health
Segment Reporting Information [Line Items]
Net service revenue	291,500	270,300	575,600	537,900
Cost of service, excluding depreciation and amortization	176,500	164,800	350,900	327,800
General and administrative expenses	68,400	68,900	136,400	136,900
Depreciation and amortization	800	1,000	1,600	1,900
Securities Class Action Lawsuit settlement, net		0		0
Operating expenses	245,700	234,700	488,900	466,600
Operating income	45,800	35,600	86,700	71,300
Hospice
Segment Reporting Information [Line Items]
Net service revenue	101,400	90,300	198,700	173,900
Cost of service, excluding depreciation and amortization	51,700	45,400	101,800	88,400
General and administrative expenses	20,300	19,100	40,300	37,000
Depreciation and amortization	300	200	500	500
Securities Class Action Lawsuit settlement, net		0		0
Operating expenses	72,300	64,700	142,600	125,900
Operating income	29,100	25,600	56,100	48,000
Personal Care
Segment Reporting Information [Line Items]
Net service revenue	18,700	14,300	36,600	27,800
Cost of service, excluding depreciation and amortization	14,400	10,300	28,200	20,700
General and administrative expenses	3,300	3,000	6,500	6,200
Depreciation and amortization	0	0	100	100
Securities Class Action Lawsuit settlement, net		0		0
Operating expenses	17,700	13,300	34,800	27,000
Operating income	1,000	1,000	1,800	800
Other
Segment Reporting Information [Line Items]
Net service revenue	0	0	0	0
Cost of service, excluding depreciation and amortization	0	0	0	0
General and administrative expenses	31,100	30,000	61,300	59,500
Depreciation and amortization	2,000	3,300	4,500	6,500
Securities Class Action Lawsuit settlement, net		28,700		28,700
Operating expenses	33,100	62,000	65,800	94,700
Operating income	$ (33,100)	$ (62,000)	$ (65,800)	$ (94,700)