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Fair Value Measurements (Summary Of Accrued Earnout Activity) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Fair Value Measurements [Abstract]    
Beginning balance $ 7,230 $ 15,086
Additions 2,594 3,228
Payments (3,914) (3,608)
Change in estimate (2,098) (5,299)
Foreign currency translation adjustments 20 (588)
Ending balance $ 3,832 $ 8,819