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Fair Value Measurements (Summary Of Accrued Earnout Activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fair Value Measurements [Abstract]    
Beginning balance, December 31, $ 15,086 $ 30,063
Additions 2,664 5,375
Payments (3,088) (14,439)
Change in estimate (2,201) (1,647)
Foreign currency translation adjustments (267) 427
Ending balance, June 30, $ 12,194 $ 19,779