Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Goodwill and Intangible Assets [Line Items]
Amortization of intangible assets	$ 3,000	$ 3,200	$ 5,740	$ 6,246
Customer Relationships [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			10 years 3 months 18 days
Trade Name [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			10 years
Non-Compete Agreements [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			9 years 1 month 6 days
Ziegler Intangibles [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			11 years 8 months 12 days
Ziegler [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill and intangible assets	$ 27,600		$ 27,600