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Current Liabilities - Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]            
Salaries and benefits $ 8,122   $ 10,359      
Warranty accrual 1,873 2,052 2,273 2,795 2,165 2,398
Advanced billing 232   29      
Accrued taxes-other 202   0      
Capital lease, current portion 0   15      
Other 1,533   2,184      
Balance, end of the period $ 11,962   $ 14,860 [1]      
[1] The balance sheet as of December 31, 2012 has been derived from the audited financial statements at that date.