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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Accumulated Amortization $ 100,506 $ 85,487 $ 90,658
Intangible Assets, Gross (Excluding Goodwill) 272,230 220,248 220,790
Intangible Assets, Net (Excluding Goodwill) 171,724 134,761 130,132
Customer Relationships      
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Gross 187,804 138,941 138,687
Finite-Lived Intangible Assets, Accumulated Amortization 52,204 39,792 42,276
Finite-Lived Intangible Assets, Net $ 135,600 $ 99,149 96,411
Customer Relationships | Minimum      
Acquired Intangible Assets      
Estimated useful life in years 6 years 6 years  
Customer Relationships | Maximum      
Acquired Intangible Assets      
Estimated useful life in years 16 years 16 years  
Patents      
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Gross $ 55,858 $ 57,416 57,576
Finite-Lived Intangible Assets, Accumulated Amortization 38,451 37,277 38,764
Finite-Lived Intangible Assets, Net $ 17,407 $ 20,139 18,812
Patents | Minimum      
Acquired Intangible Assets      
Estimated useful life in years 3 years 3 years  
Patents | Maximum      
Acquired Intangible Assets      
Estimated useful life in years 19 years 19 years  
Tradenames      
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Gross $ 15,922 $ 10,416 10,995
Finite-Lived Intangible Assets, Accumulated Amortization 5,828 4,708 5,381
Finite-Lived Intangible Assets, Net $ 10,094 $ 5,708 5,614
Tradenames | Minimum      
Acquired Intangible Assets      
Estimated useful life in years 3 years 3 years  
Tradenames | Maximum      
Acquired Intangible Assets      
Estimated useful life in years 15 years 15 years  
Non-compete Agreements      
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Gross $ 7,650 $ 8,479 8,536
Finite-Lived Intangible Assets, Accumulated Amortization 3,890 3,609 4,128
Finite-Lived Intangible Assets, Net $ 3,760 $ 4,870 4,408
Non-compete Agreements | Minimum      
Acquired Intangible Assets      
Estimated useful life in years 3 years 3 years  
Non-compete Agreements | Maximum      
Acquired Intangible Assets      
Estimated useful life in years 6 years 6 years  
Other      
Acquired Intangible Assets      
Finite-Lived Intangible Assets, Gross $ 309 $ 309 309
Finite-Lived Intangible Assets, Accumulated Amortization 133 101 109
Finite-Lived Intangible Assets, Net $ 176 $ 208 200
Other | Minimum      
Acquired Intangible Assets      
Estimated useful life in years 2 years 2 years  
Other | Maximum      
Acquired Intangible Assets      
Estimated useful life in years 12 years 12 years  
Purchased research and development      
Acquired Intangible Assets      
Indefinite-Lived Intangible Assets - Purchased research and development $ 4,687 $ 4,687 $ 4,687