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Details of Certain Balance Sheet Accounts (Schedule of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Details Of Certain Balance Sheet Accounts [Abstract]    
Current portion of operating lease liabilities $ 9,713 $ 9,283
Payor advances 6,684 4,206
Accrued health insurance 4,380 5,607
Accrued professional fees 2,860 4,220
Accrued payroll taxes 1,199 4,543
Other 10,944 9,705
Total accrued expenses $ 35,780 $ 37,564