Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 21,866	$ 27,189
Less: accumulated depreciation	(10,174)	(13,750)
Property and equipment, net	11,692	13,439
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,848	2,848
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,240	9,432
Maintenance equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	0	802
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,245	5,174
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,001	5,007
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,462	3,591
Automobiles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 70	$ 335