Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period		$ 10,840	$ 8,129
Acquisitions		0	0
Payments		(415)	(127)
Accretion	[1]	239	289
Fair value adjustments	[1]	(366)	(232)
Balance at end of the period		10,298	8,059	[2]
Less current portion in accrued expenses and other current liabilities		(5,073)	(3,494)
Total long-term portion in other long-term liabilities		5,225	$ 4,565
Contingent consideration, total remaining estimated payments		$ 13,300

[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 March 31, 2016 are $13.3 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.