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Significant Payors (Narrative) (Details)
12 Months Ended
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%