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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)