Operating Segments and Related Information - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting [Abstract]
Sales Revenue, Services, Net	$ 38,510	$ 35,291	$ 72,079	$ 66,524
Revenue, net	0	(4)	0	(15)
Cost of sales	342	451	676	840
Selling, general and administrative expense	5	100	5	184
Depreciation and amortization	2	4	4	7
Loss from discontinued operations before income taxes	(349)	(559)	(685)	(1,046)
Income tax expense	0	0	0	0
Net loss from discontinued operations	$ (349)	$ (559)	$ (685)	$ (1,046)