Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 50,142	$ 37,834
Less accumulated depreciation and amortization	(16,054)	(13,173)
Property and equipment, net	34,088	24,661
Depreciation expense	3,500	2,300	$ 2,800
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,318	13,830
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,741	3,912
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,545	3,924
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,239	1,448
Furniture, fixtures and other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,299	4,279
Construction in Progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 0	$ 10,441