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Business Combinations - Textual (Details) | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2021 USD ($) bed | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) bed | Jun. 30, 2020 USD ($) | Jun. 01, 2021 location | Apr. 30, 2021 bed
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired |  |  | $ 97,700,000 | $ 1,100,000 |  |
Home Health and Hospice |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire businesses, gross |  |  | 4,000,000 |  |  |
Home Health and Hospice | Frontier Home Health and Hospice |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired | $ 97,700,000 | $ 0 | $ 97,700,000 | 1,100,000 |  |
Home Health and Hospice | Heart of the Rockies Home Health | Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 50.00% |
Home Health and Hospice | Hospice of Southwest Montana | Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 90.00% |
Equity method investment, additional ownership percentage |  |  |  |  | 40.00% |
Home Health and Hospice | Home health | Frontier Home Health and Hospice |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of locations | location |  |  |  |  | 9 |
Home Health and Hospice | Hospice | Frontier Home Health and Hospice |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of locations | location |  |  |  |  | 11 |
Inpatient Rehabilitation Segment | Shannon Medical | Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition percentage of voting interests acquired |  |  |  |  |  | 51.00%
Number of beds acquired | bed |  |  |  |  |  | 14
Inpatient Rehabilitation Segment | Heritage Valley Health System, Inc | Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition percentage of voting interests acquired | 75.00% |  | 75.00% |  |  |
Number of beds acquired | bed | 16 |  | 16 |  |  |
Acquisitions of businesses, net of cash acquired |  |  | $ 1,100,000 |  |  |
Inpatient Rehabilitation Segment | Shannon Medical And Heritage Valley Health System |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired | $ 1,100,000 | $ 0 | 1,100,000 | $ 0 |  |
Goodwill expected to be tax-deductible amount | $ 0 |  | $ 0 |  |  |

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