Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 61,423	$ 61,542
Less accumulated depreciation	(48,500)	(47,859)
Property and equipment, net	12,923	13,683
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,403	44,059
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,525	9,051
Leasehold improvements and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,495	$ 8,432