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Other Comprehensive Income (Reclassification out of AOCI) (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
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales and operating expenses $ (310,089) $ (327,909) $ (942,697) $ (918,516)
Interest expense (5,313) (5,868) (16,607) (18,546)
Amortization of prior service cost 15 23 45 67
Amortization of actuarial loss 1,300 1,189 3,900 3,567
Total before tax 45,024 59,307 140,600 161,877
Income taxes (17,373) (22,135) (54,126) (59,909)
Net income 27,651 37,172 86,474 101,968
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Net income 456 (900) (483) (3,161)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 2,060 (259) 3,155 (1,527)
Income taxes (798) 101 (1,222) 592
Net income 1,262 (158) 1,933 (935)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Natural Gas Swap [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales and operating expenses (95) (259) 92 (1,267)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Corn Option [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales and operating expenses 2,155 0 3,063 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 0 0 0 (260)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member]
        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service cost (15) [1] (23) [1] (45) [1] (67) [1]
Amortization of actuarial loss (1,300) [1] (1,189) [1] (3,900) [1] (3,567) [1]
Total before tax (1,315) (1,212) (3,945) (3,634)
Income taxes 509 470 1,529 1,408
Net income $ (806) $ (742) $ (2,416) $ (2,226)
[1] These items are included in the computation of net periodic pension cost. See Note 9 Employee Benefit Plans for additional information.