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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
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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 |

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