Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period		$ 8,129	$ 7,414
Acquisitions		1,093	1,455
Payments		(1,874)	(3,513)
Accretion (a)	[1]	559	533
Fair value adjustments (a)	[1]	90	828
Balance at end of the period (b)		7,997	6,717	[2]
Less current portion in accrued expenses and other current liabilities		(4,264)	(1,964)
Total long-term portion in other long-term liabilities		3,733	$ 4,753
Contingent consideration, total remaining estimated payments		$ 11,400

[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, 2015 are $11.4 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.