Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period		$ 10,840	$ 8,129
Acquisitions		1,322	1,093
Payments		(2,715)	(1,874)
Accretion	[1]	664	559
Fair value adjustments	[1]	421	90
Balance at end of the period	[2]	10,532	7,997
Less current portion in accrued expenses and other current liabilities		(4,720)	(4,264)
Total long-term portion in other long-term liabilities		5,812	$ 3,733
Contingent consideration, total remaining estimated payments		$ 13,100

[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 June 30, 2016 are $13.1 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.