Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Business Combination, Contingent Consideration, Reconciliation of Change in Liability [Roll Forward]
Balance at beginning of period	$ 9,241	$ 10,840
Acquisitions	(7,288)	(1,322)
Payments	(2,569)	(2,715)
Accretion	716	664
Fair value adjustments	1,137	421
Net foreign currency translation adjustment	353	0
Balance at end of the period	16,166	10,532
Less current portion in accrued expenses and other current liabilities	(6,263)	(4,720)
Total long-term portion in other long-term liabilities	9,903	$ 5,812
Contingent consideration, total remaining estimated payments	$ 20,200