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Significant Payors (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |
Net service revenues | $ 864,499 | $ 764,775 | $ 648,791
Operating income | 65,936 | $ 44,507 | $ 34,752
New York [Member] | CDPAP |  |  |
Concentration Risk [Line Items] |  |  |
Net service revenues | 42,000 |  |
Operating income | $ 3,000 |  |
Revenues [Member] | Geographic Concentration Risk [Member] | Illinois [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 38.20% | 37.70% | 38.20%
Revenues [Member] | Illinois Department On Aging [Member] | Geographic Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 21.40% | 23.00% | 25.30%
Accounts Receivable [Member] | Illinois Department On Aging [Member] | Geographic Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 16.10% | 15.90% |

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