Accrued And Other Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued And Other Liabilities [Abstract]
Compensation and benefits	$ 20,432	$ 22,771
Accrued taxes	13,861	9,831
Arbitration awards	11,282
Vendor accruals	7,044	8,231
Product warranty liability	5,564	5,219
Accrued earnouts related to acquisitions	2,772	3,238
Accrued other	2,485	2,956
Royalties payable	1,679	2,092
Accrued professional fees	742	810
Accrued interest	38	39
Total	$ 65,899	$ 55,187