Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 53,856	$ 54,414
Less accumulated depreciation and amortization	(33,088)	(29,776)
Property and equipment, net	20,768	24,638
Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	20,415	21,730
Computers and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,257	10,182
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,388	2,483
Other Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,326	4,266
Vehicles
Property Plant And Equipment [Line Items]
Property and equipment, gross	281	297
Construction in Process
Property Plant And Equipment [Line Items]
Property and equipment, gross	12,746	12,116
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3,443	$ 3,340