Business Segments and Geographic Information (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of reportable business segments | segment			4
Equity in earnings (losses) of affiliates, net of income tax provision	$ 1,693	$ 1,340	$ 4,943	$ 3,949
Investment in subsidiary	0		$ 0		$ 0
SACS
Schedule of Equity Method Investments [Line Items]
Ownership percentage in Entity			50.00%
Equity in earnings (losses) of affiliates, net of income tax provision	1,100	1,200	$ 2,900	3,400
Investment in Joint Ventures	10,300		$ 10,300		9,900
Geo Amey
Schedule of Equity Method Investments [Line Items]
Ownership percentage in Entity			50.00%
Equity in earnings (losses) of affiliates, net of income tax provision	700	$ 200	$ 2,100	$ 600
Investment in subsidiary	$ 200		$ 200		$ (1,500)