Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 87,278	$ 81,392
Less: accumulated depreciation	(64,057)	(57,263)
Total	23,221	24,129
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	73,429	67,631
Furniture, Equipment and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 13,849	$ 13,761