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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Customer relationships
Dec. 31, 2012
Customer relationships
Dec. 31, 2013
Proprietary technology
Dec. 31, 2012
Proprietary technology
Dec. 31, 2013
Noncompete agreements
Dec. 31, 2012
Noncompete agreements
Dec. 31, 2013
Trade names
Dec. 31, 2012
Trade names
Dec. 31, 2013
Minimum
Customer relationships
Dec. 31, 2013
Maximum
Customer relationships
Dec. 31, 2013
Maximum
Proprietary technology
Goodwill And Other Intangible Assets [Line Items]                              
Goodwill $ 172,788 $ 176,620 $ 165,372 $ 103,639                      
Identifiable intangible assets:                              
Other identifiable intangibles         25,962 31,163 14,356 17,145 600 2,359          
Tradenames                     12,594 13,332      
Total carrying value of other intangibles 53,512 63,999                          
Identifiable Intangible Asset, Useful Life (Yrs)                 2 years       10 years 12 years 15 years
Other identifiable intangibles, cost basis         31,357 34,135 18,851 19,624 4,154 4,154          
Total carrying value of goodwill and other intangibles $ 226,300 $ 240,619