Business Segments and Geographic Information (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Number of reportable business segment	4
Equity in earnings (losses) of affiliates, net of income tax provision	$ 1,484,000	$ 1,217,000
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	1,200,000	1,300,000
Investment in Joint Ventures	9,200,000		8,100,000
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	(300,000)	100,000
Investment in Joint Ventures	$ (2,600,000)		$ (3,000,000)