Accrued And Other Liabilities (Schedule Of Other Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued And Other Liabilities [Abstract]
Arbitration award	$ 11,282	$ 11,282
Long term employee indemnity	11,152	9,794
Defined benefit pension obligation	7,613	6,211
Long term tax liability	7,183	6,996
Long term earnouts related to acquisitions	7,568	9,673
Long term deferred revenue	7,464	7,956
Other long term liabilities	5,726	4,927
Total	$ 57,988	$ 56,839