Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Contingent Consideration, Reconciliation of Change in Liability
Balance at beginning of period	$ 7,302	$ 12,545	$ 9,241
Acquisitions	0	43	7,288
Payments	(10)	(4,803)	(7,682)
Accretion	792	951	1,652
Fair value adjustments	(3,691)	(944)	1,257
Net foreign currency translation adjustment	3	(490)	789
Balance at end of the period	4,396	7,302	12,545
Less current portion in accrued expenses and other current liabilities	(2,351)	(17)	(4,658)
Total long-term portion in other long-term liabilities	2,045	$ 7,285	$ 7,887
Contingent consideration, total remaining estimated payments	$ 5,600