Acquisitions and Divestitures (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Acquisitions and Divestitures [Abstract]
Revenue	$ 12,742	$ 11,227	$ 33,256	$ 35,122
Net (loss) income before non-controlling interests	(455)	(1,518)	5,232	13,969
Net (loss) income attributable to non-controlling interests	270	16	(2,234)	92
Net (loss) income attributable to controlling interests	$ (725)	$ (1,534)	$ 7,566	$ 13,877
Net income per share (basic)	$ (0.09)	$ (0.27)	$ 1.00	$ 2.49
Net income per share (diluted)	$ (0.10)	$ (0.27)	$ 0.96	$ 2.14