Goodwill And Intangible Assets, Net (Schedule Of Finite-Lived Intangible Assets By Major Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets, Net [Abstract]
Customer lists and relationships	$ 106,980	$ 106,536
Non-compete agreements	23,478	23,407
Other	28,207	28,274
Intangible assets, at cost	158,665	158,217
Less: accumulated amortization	(132,232)	(129,490)
Intangible assets, net	$ 26,433	$ 28,727