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Goodwill and Intangible Assets (Schedule of Carrying Amount and Accumulated Amortization of Intangible Asset) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]    
Intangible assets with indefinite lives $ 21,221  
Intangible assets subject to amortization:    
Gross carrying amount 106,890  
Accumulated amortization (61,779)  
Intangible assets subject to amortization, net 45,111  
Total intangible assets at September 30, 2021 66,332 $ 71,549
Customer And Referral Relationships [Member]    
Intangible assets subject to amortization:    
Gross carrying amount 44,672  
Accumulated amortization (35,866)  
Intangible assets subject to amortization, net 8,806  
Total intangible assets at September 30, 2021 8,806  
Trade Names and Trademarks [Member]    
Intangible assets subject to amortization:    
Gross carrying amount 42,926  
Accumulated amortization (17,800)  
Intangible assets subject to amortization, net 25,126  
Total intangible assets at September 30, 2021 25,126  
Non-competition Agreements [Member]    
Intangible assets subject to amortization:    
Gross carrying amount 6,785  
Accumulated amortization (3,579)  
Intangible assets subject to amortization, net 3,206  
Total intangible assets at September 30, 2021 3,206  
State Licenses [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangible assets with indefinite lives 21,221  
Intangible assets subject to amortization:    
Gross carrying amount 12,507  
Accumulated amortization (4,534)  
Intangible assets subject to amortization, net 7,973  
Total intangible assets at September 30, 2021 $ 29,194