Accrued And Other Liabilities (Schedule Of Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued And Other Liabilities [Abstract]
Long term employee indemnity	$ 13,887	$ 11,152
Defined benefit pension obligation	8,290	7,613
Other long term liabilities	7,596	7,183
Long term deferred revenue	7,298	7,464
Long term tax liability	9,340	5,726
Long term earnouts related to acquisitions	2,343	7,568
Arbitration award		11,282
Total	$ 48,754	$ 57,988