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Basis of Presentation and Significant Accounting Policies - Revenue Recognition Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Description Of Business And Significant Accounting Policies [Line Items]      
Revenue $ 1,279,185 $ 1,149,670 $ 943,747
Patient Visits      
Description Of Business And Significant Accounting Policies [Line Items]      
Revenue 933,900 818,500 $ 683,000
Clinical Trials      
Description Of Business And Significant Accounting Policies [Line Items]      
Revenue $ 3,700 $ 4,300