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Changes in shareholders' equity Accumulated other comprehensive income into income expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of goods sold $ (199,746) $ (206,793)
Total reclassifications, net of tax 2,586 897
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 1,871 (209)
Tax (benefit) expense (341) 10
Total reclassifications, net of tax 1,530 (199)
Pension and Other Postretirement Benefits Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 1,636 1,606
Tax (benefit) expense (580) (510)
Total reclassifications, net of tax 1,056 1,096
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 1,622 1,606
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 14 0
Foreign Currency Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of goods sold $ 1,871 $ (209)