Goodwill And Other Intangible Assets (Acquired Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 65,277	$ 65,205
Accumulated Amortization	(40,723)	(34,378)
Net	24,554	30,827
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	18,928	18,848
Accumulated Amortization	(15,098)	(13,520)
Net	3,830	5,328
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	45,763	45,771
Accumulated Amortization	(25,131)	(20,407)
Net	20,632	25,364
Trademarks and other[Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	586	586
Accumulated Amortization	(494)	(451)
Net	$ 92	$ 135