Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 57,622	$ 53,696
Less: accumulated depreciation	(40,293)	(36,078)
Total	17,329	17,618
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	49,170	45,790
Furniture, Equipment and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 8,452	$ 7,906