Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 115,185	$ 91,694
Less -- accumulated depreciation	61,989	47,383
Total	53,196	44,311
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	14,445	10,957
Computer and related equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	33,121	21,741
Computer Software, Intangible Asset [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	52,929	41,416
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	10,551	5,637
Work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 4,139	$ 11,943