Business Segments and Geographic Information (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 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	$ 1,340	$ 1,544	$ 3,949	$ 4,202
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	1,200	1,300	$ 3,400	3,600
Investment in Joint Ventures	9,900		$ 9,900		$ 8,000
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	200	$ 300	$ 500	$ 600
Losses in equity method investment	$ (1,500)		$ (1,500)		$ (2,200)