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Fair Value Measurements (Summary Of Accrued Earnout Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Measurements [Abstract]    
Beginning balance $ 7,230 $ 15,086
Additions 173 1,372
Payments (1,360) (1,234)
Change in estimate (1,023) (1,552)
Foreign currency translation adjustments 4 (319)
Ending balance $ 5,024 $ 13,353