Composition Of Certain Financial Statement Captions (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Items Included in Consolidated Statement of Financial Condition [Abstract]
Buildings	$ 138,106		$ 138,106		$ 137,751
Equipment	67,182		67,182		66,167
Land	9,929		9,929		9,929
Purchased software	95,448		95,448		91,468
Furniture and fixtures	16,909		16,909		18,535
Leasehold improvements	4,467		4,467		5,037
Construction in progress	1,106		1,106		112
Property and Equipment, gross	333,147		333,147		328,999
Less: Accumulated depreciation	(214,653)		(214,653)		(201,418)
Property and Equipment, net	118,494		118,494		127,581
Depreciation expense	$ 5,616	$ 5,761	$ 17,050	$ 16,823