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Accumulated Other Comprehensive Loss - Changes in accumulated balances (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Abstract]        
Foreign currency, net of tax, Beginning balance $ 1,526 $ 1,720 $ 1,797 $ 1,694
Foreign currency, net of tax, Other comprehensive loss before reclassification 92   (179)  
Foreign currency, net of tax, Amounts reclassified from accumulated other comprehensive loss          
Foreign currency, net of tax, Current-period other comprehensive (loss) income 92 185 (179) 211
Foreign currency, net of tax, Ending balance 1,618 1,905 1,618 1,905
Defined benefit pension plan, net of tax, Beginning balance (31,175) (23,806) (32,051) (23,806)
Defined benefit pension plan, net of tax, Other comprehensive loss before reclassification          
Defined benefit pension plan, net of tax, Amounts reclassified from accumulated other comprehensive loss 437   1,313  
Defined benefit pension plan, net of tax, Current-period other comprehensive (loss) income 437    1,313   
Defined benefit pension plan, net of tax, Ending balance (30,738) (23,806) (30,738) (23,806)
Other, net of tax, Beginning balance 212 212 212 212
Other, net of tax, Other comprehensive loss before reclassification          
Other, net of tax, Amounts reclassified from accumulated other comprehensive loss          
Other, net of tax, Current-period other comprehensive (loss) income            
Other, net of tax, Ending balance 212 212 212 212
Beginning balance (29,437) (21,874) (30,042) (21,900)
Other comprehensive loss before reclassification 92   (179)  
Amounts reclassified from accumulated other comprehensive loss 437   1,313  
Current-period other comprehensive (loss) income 529 185 1,134 211
Ending balance $ (28,908) $ (21,689) $ (28,908) $ (21,689)