Business Segments and Geographic Information (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012
Business Segment and Geographical Information (Textual) [Abstract]
Number of reportable business segment	4
Ownership percentage in Entity	50.00%
Equity in earnings of affiliates, net of income tax provision	$ 1,217,000	$ 748,000
SACS
Business Segment and Geographical Information (Textual) [Abstract]
Ownership percentage in Entity	50.00%
Equity in earnings of affiliates, net of income tax provision	1,300,000	1,300,000
Investment in Joint Ventures	7,600,000		7,800,000
Geo Amey
Business Segment and Geographical Information (Textual) [Abstract]
Equity in earnings of affiliates, net of income tax provision	100,000	500,000
Investment in Joint Ventures	$ (4,200,000)		$ (4,100,000)