Business Segments and Geographic Information (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 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	$ 1,174,000	$ 1,029,000	$ 2,658,000	$ 2,246,000
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	2,300,000	2,500,000
Investment in Joint Ventures	9,900,000		9,900,000		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	100,000	(200,000)	300,000	(300,000)
Investment in Joint Ventures	$ (2,600,000)		$ (2,600,000)		$ (3,000,000)