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Segment And Geographic Information (Revenues By Major Geographic Area) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Total revenues $ 193,329 $ 178,595 $ 374,370 $ 351,293
United States [Member]
       
Total revenues 144,872 138,760 278,172 268,123
Europe [Member]
       
Revenue from foreign countries 25,209 20,076 50,296 44,228
Asia Pacific [Member]
       
Revenue from foreign countries 11,625 9,174 22,372 18,411
Other Foreign [Member]
       
Revenue from foreign countries $ 11,623 $ 10,585 $ 23,530 $ 20,531