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Properties and Equipment Property and equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 107,163us-gaap_PropertyPlantAndEquipmentGross	$ 103,040us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(86,813)	(82,512)
Property and equipment, net	20,350us-gaap_PropertyPlantAndEquipmentNet	20,528us-gaap_PropertyPlantAndEquipmentNet
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49,220	46,427
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,443	19,429
Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,404	28,249
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,096	$ 8,935