Business Segments and Geographic Information (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)	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	$ 1,119	$ 1,485
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	$ 900	1,100
Investment in Joint Ventures	$ 9,900		$ 9,000
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	$ 300	$ 400
Losses in equity method investment	$ (900)		$ (1,200)