Composition Of Certain Financial Statement Captions (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Items Included in Consolidated Statement of Financial Condition [Abstract]
Buildings	$ 137,751	$ 136,949
Equipment	66,167	64,256
Land	9,929	9,929
Purchased software	91,468	77,971
Furniture and fixtures	18,535	17,999
Leasehold improvements	5,037	4,558
Construction in progress	112	339
Property and Equipment, gross	328,999	312,001
Less: Accumulated depreciation	(201,418)	(182,453)
Property and Equipment, net	127,581	129,548
Depreciation expense	$ 22,586	$ 21,471	$ 21,902