Goodwill and Intangible Assets (Schedule of Carrying Amount and Accumulated Amortization of Intangible Asset) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives	$ 20,791
Intangible assets subject to amortization:
Gross carrying amount	106,330
Accumulated amortization	(57,726)
Intangible assets subject to amortization, net	48,604
Total intangible assets at March 31, 2021	69,395	$ 71,549
Customer and Referral Relationships [Member]
Intangible assets subject to amortization:
Gross carrying amount	44,672
Accumulated amortization	(34,915)
Intangible assets subject to amortization, net	9,757
Total intangible assets at March 31, 2021	9,757
Trade Names and Trademarks [Member]
Intangible assets subject to amortization:
Gross carrying amount	42,926
Accumulated amortization	(16,152)
Intangible assets subject to amortization, net	26,774
Total intangible assets at March 31, 2021	26,774
Non-competition Agreements [Member]
Intangible assets subject to amortization:
Gross carrying amount	6,225
Accumulated amortization	(3,111)
Intangible assets subject to amortization, net	3,114
Total intangible assets at March 31, 2021	3,114
State Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives	20,791
Intangible assets subject to amortization:
Gross carrying amount	12,507
Accumulated amortization	(3,548)
Intangible assets subject to amortization, net	8,959
Total intangible assets at March 31, 2021	$ 29,750