Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period	$ 12,545	$ 9,241
Acquisitions	0	7,288
Payments	(4,877)	(2,574)
Accretion	769	1,227
Fair value adjustments	(1,169)	1,204
Net foreign currency translation adjustment	(164)	659
Balance at end of the period	7,104	17,045
Less current portion in accrued expenses and other current liabilities	(25)	(6,649)
Total long-term portion in other long-term liabilities	7,079	$ 10,396
Contingent consideration, total remaining estimated payments	$ 9,100