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Accumulated Other Comprehensive Loss - Changes in accumulated balances (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Abstract]        
Foreign currency, net of tax, Beginning balance $ 1,688 $ 1,829 $ 1,797 $ 1,694
Foreign currency, net of tax, Other comprehensive loss before reclassification (162)   (271)  
Foreign currency, net of tax, Amounts reclassified from accumulated other comprehensive loss          
Foreign currency, net of tax, Current-period other comprehensive (loss) income (162) (109) (271) 26
Foreign currency, net of tax, Ending balance 1,526 1,720 1,526 1,720
Defined benefit pension plan, net of tax, Beginning balance (31,333) (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 158   876  
Defined benefit pension plan, net of tax, Current-period other comprehensive (loss) income 158    876   
Defined benefit pension plan, net of tax, Ending balance (31,175) (23,806) (31,175) (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 (29,433) (21,765) (30,042) (21,900)
Other comprehensive loss before reclassification (162)   (271)  
Amounts reclassified from accumulated other comprehensive loss 158   876  
Current-period other comprehensive (loss) income (4) (109) 605 26
Ending balance $ (29,437) $ (21,874) $ (29,437) $ (21,874)