Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 60,296	$ 60,986
Accumulated depreciation	(37,849)	(46,871)
Property and equipment, net	22,447	14,115
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,551	45,173
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,949	9,090
Leasehold improvements and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,796	$ 6,723