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Revenue Recognition (Comparison Of Geographic Revenues) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 1,214,969 $ 1,165,095 $ 1,142,167
U.S. [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 756,907 707,906 667,301
EMEA [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 212,699 211,349 207,474
CHINA      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 106,841 106,526 127,298
Other [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 138,522 $ 139,314 $ 140,094