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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Customer Relationships [Member]
Dec. 31, 2011
Customer Relationships [Member]
Dec. 31, 2012
Proprietary Technology [Member]
Dec. 31, 2011
Proprietary Technology [Member]
Dec. 31, 2012
Noncompete Agreements [Member]
Dec. 31, 2011
Noncompete Agreements [Member]
Dec. 31, 2012
Trade Names [Member]
Dec. 31, 2011
Trade Names [Member]
Dec. 31, 2012
Minimum [Member]
Customer Relationships [Member]
Dec. 31, 2012
Maximum [Member]
Customer Relationships [Member]
Dec. 31, 2012
Maximum [Member]
Proprietary Technology [Member]
Goodwill And Other Intangible Assets [Line Items]                              
Goodwill $ 177,181 $ 165,372 $ 103,639 $ 104,290                      
Other identifiable intangibles, cost basis         37,400 32,600 21,516 18,116 4,302 2,702          
Other identifiable intangibles         31,163 30,850 17,145 16,042 2,359 2,119          
Indefinite-lived intangible assets                     13,332 9,049      
Total carrying value of other intangibles 63,999 58,060                          
Total carrying value of goodwill and other intangibles $ 241,180 $ 223,432                          
Identifiable Intangible Asset, Useful Life (Yrs)                 2 years       10 years 12 years 15 years