Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Amortization of intangible assets	$ 2,738	$ 2,981
Customer Relationships [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	10 years 7 months 6 days
Trade Name [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	10 years 3 months 18 days
Non-Compete Agreements [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	9 years 4 months 24 days
Ziegler Intangibles [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets	12 years
Ziegler [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill and intangible assets	$ 27,500