Accrued And Other Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Compensation and benefits	$ 19,496	$ 20,432
Accrued taxes	16,457	13,861
Arbitration awards	11,282	11,282
Vendor accruals	7,078	7,044
Product warranty liability	5,855	5,564
Accrued earnouts related to acquisitions	2,556	2,772
Accrued other	1,350	2,485
Royalties payable	1,570	1,679
Accrued professional fees	686	742
Accrued interest	112	38
Total	$ 66,442	$ 65,899