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Segment And Related Information (Reconciliation Of Revenue from Segments To Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment And Related Information [Abstract]    
Total segment operating income $ 11,400 $ 11,081
Amortization of acquired software (410) (295)
Amortization of customer and trade name intangibles (946) (804)
Other expense, net (703) (500)
Income before income taxes $ 9,341 $ 9,482