Business Segments and Geographic Information (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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	$ 1,544,000	$ 1,526,000	$ 4,202,000	$ 3,772,000
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	1,300,000	1,300,000	3,600,000	3,800,000
Investment in Joint Ventures	9,200,000		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	200,000	600,000	100,000
Investment in Joint Ventures	$ (2,400,000)		$ (2,400,000)		$ (3,000,000)