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Basis of Presentation - Table 1 (Details) - Net operating revenues [Member] - Payor Source [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%	100.00%
Other Income Source [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.00%	1.40%	1.00%	1.20%
Other Income Source [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.60%	1.20%	1.50%
Other Income Source [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.10%	0.10%	0.10%	0.10%
Third-Party Payor [Member] | Medicare [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	75.30%	74.70%	75.10%	75.10%
Third-Party Payor [Member] | Medicare [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	72.80%	73.10%	73.00%	73.30%
Third-Party Payor [Member] | Medicare [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	84.90%	82.30%	84.50%	82.90%
Third-Party Payor [Member] | Medicare Advantage [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.90%	8.10%	8.90%	7.90%
Third-Party Payor [Member] | Medicare Advantage [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.70%	7.80%	8.60%	7.70%
Third-Party Payor [Member] | Medicare Advantage [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	10.10%	9.00%	10.20%	8.90%
Third-Party Payor [Member] | Managed Care [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	9.60%	10.00%	9.80%	9.80%
Third-Party Payor [Member] | Managed Care [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	11.10%	11.50%	11.20%	11.20%
Third-Party Payor [Member] | Managed Care [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.50%	3.70%	3.70%	3.20%
Third-Party Payor [Member] | Medicaid [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.80%	3.20%	2.70%	3.30%
Third-Party Payor [Member] | Medicaid [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.20%	2.90%	3.00%	3.00%
Third-Party Payor [Member] | Medicaid [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	4.80%	1.40%	4.80%
Third-Party Payor [Member] | Other Third-party Payors [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.40%	1.30%	1.40%
Third-Party Payor [Member] | Other Third-party Payors [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.60%	1.70%	1.60%	1.70%
Third-Party Payor [Member] | Workers' Compensation [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.70%	0.70%	0.70%	0.80%
Third-Party Payor [Member] | Workers' Compensation [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.80%	0.80%	0.90%	1.00%
Self-Pay [Member] | Patients [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.40%	0.50%	0.50%	0.50%
Self-Pay [Member] | Patients [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.50%	0.60%	0.50%	0.60%
Self-Pay [Member] | Patients [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.10%	0.10%	0.10%	0.10%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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