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Long-Term Debt (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
D
Dec. 31, 2011
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Cash [Member]
Dec. 31, 2012
Mexican Subsidiaries [Member]
Dec. 31, 2012
Standby letters of credit [Member]
Dec. 31, 2011
Standby letters of credit [Member]
May 31, 2011
Credit facility [Member]
Dec. 31, 2012
Credit facility [Member]
May 12, 2011
Credit facility [Member]
Dec. 31, 2011
Credit facility [Member]
Maximum [Member]
Dec. 31, 2012
Credit facility [Member]
Minimum [Member]
Long-Term Debt (Textual) [Abstract]                        
Amount available under credit facility           $ 5,000,000     $ 13,173,000 $ 50,000,000    
Credit facility maturity date               2016-05        
Increase in availability of credit facility                   60,000,000    
Unrestricted cash balance       18,664,000 11,748,000              
Letter of credit issued           999,000 990,000          
Fixed charge coverage ratio     1.15                  
Line of credit facility covenants terms credit amount                     8,000,000 6,000,000
Long-Term Debt (Additional Textual) [Abstract]                        
Unrestricted cash balance related to borrowing capacity 31,837,000                      
Weighted average interest rate for outstanding borrowings 2.60%                      
Weighted average interest rate for borrowings 2.40% 5.60%                    
Interest incurred 514,000 1,881,000                    
Capitalized interest 0 0                    
Interest paid $ 250,000 $ 1,100,000                    
Number of days for which credit facility falls below the specified limit 5