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Significant Payors (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues [Member] | Illinois Department On Aging [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 23.00% | 25.30% | 31.70%
Revenues [Member] | Geographic Concentration Risk [Member] | Illinois [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 37.70% | 38.20% | 45.00%
Accounts Receivable [Member] | Illinois Department On Aging [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 15.90% | 25.10% |

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