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Subsequent Events (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 11, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                        
Net service revenues   $ 195,996 $ 193,987 $ 184,576 $ 190,216 $ 192,376 $ 168,993 $ 148,915 $ 138,507 $ 764,775 $ 648,791 $ 516,647
Consumer Directed Personal Assistance Program [Member] | Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Net service revenues $ 52,000                      
Consumer Directed Personal Assistance Program [Member] | Minimum [Member] | Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Estimated transition period 6 months                      
Consumer Directed Personal Assistance Program [Member] | Maximum [Member] | Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Estimated transition period 12 months