SEGMENT INFORMATION - Operating Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net service revenue	$ 417,335	$ 373,704	$ 1,228,200	$ 1,113,311
Cost of service, excluding depreciation and amortization	249,739	227,269	730,612	664,139
General and administrative expenses	124,500	118,800	369,000	358,600
Depreciation and amortization	3,164	4,185	9,882	13,139
Securities Class Action Lawsuit settlement, net	0	0	0	28,712
Operating expenses	377,447	350,331	1,109,479	1,064,533
Operating income	39,888	23,373	118,721	48,778
Home Health
Segment Reporting Information [Line Items]
Net service revenue	294,900	264,100	870,500	802,000
Cost of service, excluding depreciation and amortization	181,800	168,300	532,700	496,100
General and administrative expenses	68,800	70,800	205,200	207,800
Depreciation and amortization	800	900	2,400	2,700
Securities Class Action Lawsuit settlement, net				0
Operating expenses	251,400	240,000	740,300	706,600
Operating income	43,500	24,100	130,200	95,400
Hospice
Segment Reporting Information [Line Items]
Net service revenue	103,400	95,900	302,100	269,800
Cost of service, excluding depreciation and amortization	53,400	48,400	155,200	136,700
General and administrative expenses	21,400	19,000	61,700	56,200
Depreciation and amortization	300	200	800	700
Securities Class Action Lawsuit settlement, net				0
Operating expenses	75,100	67,600	217,700	193,600
Operating income	28,300	28,300	84,400	76,200
Personal Care
Segment Reporting Information [Line Items]
Net service revenue	19,000	13,700	55,600	41,500
Cost of service, excluding depreciation and amortization	14,500	10,600	42,700	31,300
General and administrative expenses	3,000	3,100	9,500	9,200
Depreciation and amortization	100	0	200	100
Securities Class Action Lawsuit settlement, net				0
Operating expenses	17,600	13,700	52,400	40,600
Operating income	1,400	0	3,200	900
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	31,300	25,900	92,600	85,400
Depreciation and amortization	2,000	3,100	6,500	9,600
Securities Class Action Lawsuit settlement, net				28,700
Operating expenses	33,300	29,000	99,100	123,700
Operating income	$ (33,300)	$ (29,000)	$ (99,100)	$ (123,700)