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Accumulated Other Comprehensive Loss - Changes in accumulated balances (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Abstract]    
Foreign currency, net of tax, Beginning balance $ 1,797 $ 1,694
Foreign currency, net of tax, Other comprehensive loss before reclassification (109)  
Foreign currency, net of tax, Amounts reclassified from accumulated other comprehensive loss     
Foreign currency, net of tax, Current-period other comprehensive (loss) income (109) 135
Foreign currency, net of tax, Ending balance 1,688 1,829
Defined benefit pension plan, net of tax, Other comprehensive loss before reclassification     
Defined benefit pension plan, net of tax, Beginning balance (32,051) (23,806)
Defined benefit pension plan, net of tax, Amounts reclassified from accumulated other comprehensive loss 718 [1]  
Defined benefit pension plan, net of tax, Current-period other comprehensive (loss) income 718   
Defined benefit pension plan, net of tax, Ending balance (31,333) (23,806)
Other, net of tax, Beginning balance 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
Beginning balance (30,042) (21,900)
Other comprehensive loss before reclassification (109)  
Amounts reclassified from accumulated other comprehensive loss 718  
Current-period other comprehensive (loss) income 609 135
Ending balance $ (29,433) $ (21,765)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost.