Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period		$ 8,129	$ 7,414
Acquisitions		4,767	3,369
Payments		(3,963)	(3,732)
Accretion	[1]	868	782
Fair value adjustments	[1]	562	422
Balance at end of the period		10,363	8,255	[2]
Less current portion in accrued expenses and other current liabilities		(2,681)	(3,705)
Total long-term portion in other long-term liabilities		7,682	$ 4,550
Contingent consideration, total remaining estimated payments		$ 16,100

[1] Recorded in selling, general and administrative expense in the Condensed Consolidated Statements of Income

[2] Amounts represent the fair value of estimated remaining payments. The total estimated remaining payments as of September 30, 2015 are $16.1 million. The liability for contingent consideration expires at various dates through September 2029. Certain of the contingent consideration arrangements are subject to a maximum payment amount, while the remaining arrangements have no maximum contingent consideration.