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Summary of Significant Accounting Policies - Net Operating Revenues & Accounts Receivable (Details) - Payor Source [Member] | 12 Months Ended
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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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