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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, 2013
Mar. 31, 2012
Segment And Related Information [Abstract]    
Segment operating income $ 16,150 $ 11,400
Amortization of acquired software (549) (410)
Amortization of customer and trade name intangibles (1,131) (946)
Other expense, net (338) (703)
Income before income taxes $ 14,132 $ 9,341