Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 87,276	$ 82,856
Less accumulated depreciation and amortization	(59,585)	(56,324)
Property and equipment, net	27,691	26,532
Computers And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,693	9,960
Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	69,907	64,241
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,995	2,815
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,681	$ 5,840