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Goodwill and Other Intangible Assets (Goodwill) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Payments to acquire businesses $ 6,100
Goodwill [Roll Forward]  
Beginning balance 256,232
Goodwill resulting from business acquisitions 5,369
Reduction in goodwill resulting from a business acquisition purchase price allocation adjustment (525)
Foreign currency translation (321)
Ending balance $ 260,755