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Taxes (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 01, 2012
Dec. 31, 2011
Taxes (Textual) [Abstract]      
Increase in liability net of deferred tax benefit for uncertain tax positions $ 111,000 $ 222,000  
Increase (decrease) in interest and penalties 31,000 63,000  
Interest and penalties, gross 5,624,000 5,624,000  
Reserve for income taxes, noncurrent 5,066,000 5,066,000 4,796,000
Reserve for income taxes, current 558,000 558,000  
Reserve for income taxes, total 1,299,000 1,299,000  
Reserve for Income Taxes to be Recorded in Additional Paid in Capital   311,000  
Release of reserves, lower range 300,000 300,000  
Release of reserves, upper range $ 400,000 $ 400,000  
Tax years open to examination by various tax authorities 2007 through 2011    
Tax years open to examination by various tax authorities for other entities 2006 through 2011