Goodwill and Intangible Assets (Schedule of Carrying Amount and Accumulated Amortization of Intangible Asset) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives	$ 13,296
Intangible assets subject to amortization:
Gross carrying amount	96,793
Accumulated amortization	(57,216)
Intangible assets subject to amortization, net	39,577
Total intangible assets at September 30, 2020	52,873	$ 57,079
Customer and Referral Relationships [Member]
Intangible assets subject to amortization:
Gross carrying amount	48,028
Accumulated amortization	(37,263)
Intangible assets subject to amortization, net	10,765
Total intangible assets at September 30, 2020	10,765
Trade Names And Trademarks [Member]
Intangible assets subject to amortization:
Gross carrying amount	31,946
Accumulated amortization	(14,671)
Intangible assets subject to amortization, net	17,275
Total intangible assets at September 30, 2020	17,275
Noncompete Agreements
Intangible assets subject to amortization:
Gross carrying amount	4,655
Accumulated amortization	(2,716)
Intangible assets subject to amortization, net	1,939
Total intangible assets at September 30, 2020	1,939
State Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives	13,296
Intangible assets subject to amortization:
Gross carrying amount	12,164
Accumulated amortization	(2,566)
Intangible assets subject to amortization, net	9,598
Total intangible assets at September 30, 2020	$ 22,894