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Fair Value Measurements (Summary Of Accrued Earnout Activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value Measurements [Abstract]    
Beginning balance $ 7,230 $ 15,086
Additions 459 2,664
Payments (1,910) (3,088)
Change in estimate (1,288) (2,201)
Foreign currency translation adjustments 5 (267)
Ending balance $ 4,496 $ 12,194