Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period	$ 9,241	$ 10,840
Acquisitions	(4,922)	0
Payments	(1,884)	(415)
Accretion	292	239
Fair value adjustments	815	(366)
Balance at end of the period	13,386	10,298
Less current portion in accrued expenses and other current liabilities	(5,797)	(5,073)
Total long-term portion in other long-term liabilities	7,589	$ 5,225
Contingent consideration, total remaining estimated payments	$ 17,800