Goodwill and Intangible Assets (Schedule of Carrying Amount and Accumulated Amortization of Intangible Asset) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives:	$ 2,871
Intangible assets subject to amortization:
Gross carrying amount	66,303
Accumulated amortization	(46,643)
Net book value, intangible assets subject to amortization	19,660
Total intangible assets at March 31, 2019	22,531	$ 23,784
Customer And Referral Relationships [Member]
Intangible assets subject to amortization:
Gross carrying amount	42,356
Accumulated amortization	(33,436)
Net book value, intangible assets subject to amortization	8,920
Total intangible assets at March 31, 2019	8,920
Trade Names And Trademarks [Member]
Intangible assets subject to amortization:
Gross carrying amount	21,551
Accumulated amortization	(11,175)
Net book value, intangible assets subject to amortization	10,376
Total intangible assets at March 31, 2019	10,376
Non-competition Agreements [Member]
Intangible assets subject to amortization:
Gross carrying amount	2,155
Accumulated amortization	(2,009)
Net book value, intangible assets subject to amortization	146
Total intangible assets at March 31, 2019	146
State Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives:	2,871
Intangible assets subject to amortization:
Gross carrying amount	241
Accumulated amortization	(23)
Net book value, intangible assets subject to amortization	218
Total intangible assets at March 31, 2019	$ 3,089