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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - Payor Source [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%
Accounts Receivable [Member] | Medicare [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	75.10%	73.00%
Accounts Receivable [Member] | Managed Care and Other Discount Plans, including Medicare Advantage [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	17.40%	18.50%
Accounts Receivable [Member] | Medicaid [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.40%	2.70%
Accounts Receivable [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.90%	3.30%
Accounts Receivable [Member] | Workers' Compensation [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.60%
Accounts Receivable [Member] | Patients [Member] | Self-Pay [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.90%	0.90%
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	100.00%	100.00%	100.00%
Sales Revenue, Net [Member] | Medicare [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	75.50%	75.20%	74.90%
Sales Revenue, Net [Member] | Medicare [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	73.20%	73.30%	73.20%
Sales Revenue, Net [Member] | Medicare [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	85.10%	82.90%	83.70%
Sales Revenue, Net [Member] | Medicare Advantage [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.70%	7.90%	7.90%
Sales Revenue, Net [Member] | Medicare Advantage [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	8.40%	7.70%	7.90%
Sales Revenue, Net [Member] | Medicare Advantage [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	9.70%	8.70%	7.70%
Sales Revenue, Net [Member] | Managed Care [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	9.50%	9.80%	9.80%
Sales Revenue, Net [Member] | Managed Care [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	10.90%	11.20%	11.10%
Sales Revenue, Net [Member] | Managed Care [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.80%	3.90%	3.00%
Sales Revenue, Net [Member] | Medicaid [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	2.70%	3.20%	3.00%
Sales Revenue, Net [Member] | Medicaid [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	3.10%	3.00%	2.50%
Sales Revenue, Net [Member] | Medicaid [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.20%	4.30%	5.50%
Sales Revenue, Net [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.40%	1.70%
Sales Revenue, Net [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.60%	1.80%	2.00%
Sales Revenue, Net [Member] | Other Third-party Payors [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.00%	0.00%	0.00%
Sales Revenue, Net [Member] | Workers' Compensation [Member] | Third-Party Payor [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.70%	0.80%	0.90%
Sales Revenue, Net [Member] | Workers' Compensation [Member] | Third-Party Payor [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.90%	1.00%	1.10%
Sales Revenue, Net [Member] | Workers' Compensation [Member] | Third-Party Payor [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.00%	0.00%	0.00%
Sales Revenue, Net [Member] | Patients [Member] | Self-Pay [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.50%	0.50%	0.60%
Sales Revenue, Net [Member] | Patients [Member] | Self-Pay [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.60%	0.60%	0.70%
Sales Revenue, Net [Member] | Patients [Member] | Self-Pay [Member] | Home Health and Hospice Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	0.10%	0.10%	0.10%
Sales Revenue, Net [Member] | Other Income Source [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.10%	1.20%	1.20%
Sales Revenue, Net [Member] | Other Income Source [Member] | Inpatient Rehabilitation Segment [Member]
Concentration Risk [Line Items]
Net operating revenues by payor source (percent)	1.30%	1.40%	1.50%
Sales Revenue, Net [Member] | 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%	0.00%

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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=84177426&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=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 275
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