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Accrued And Other Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accrued And Other Liabilities [Abstract]    
Compensation and benefits $ 19,075 $ 22,771
Arbitration award 11,282  
Accrued taxes 9,106 9,831
Vendor accruals 7,297 8,231
Accrued earnouts related to acquisitions 3,971 3,238
Accrued other 2,726 2,956
Royalties payable 1,707 2,092
Accrued professional fees 664 810
Accrued interest 38 39
Total $ 55,866 $ 49,968