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Other Comprehensive Income (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
Before-Tax Amount:        
Amortization of prior service cost $ 15 $ 23 $ 45 $ 67
Amortization of actuarial loss 1,300 1,189 3,900 3,567
Total defined benefit pension plans 1,315 1,212 3,945 3,634
Loss activity recognized in other comprehensive loss 2,700 100 5,800 600
Other Comprehensive income (loss) 1,917 1,348 6,580 4,555
Tax (Expense) or Benefit:        
Amortization of prior service cost (6) (9) (18) (25)
Amortization of actuarial loss (503) (461) (1,511) (1,383)
Total defined benefit pension plans (509) (470) (1,529) (1,408)
Loss activity recognized in other comprehensive loss 1,000 100 2,200 (200)
Other Comprehensive income (loss) (737) (523) (2,544) (1,766)
Net-of-Tax Amount:        
Amortization of prior service cost 9 14 27 42
Amortization of actuarial loss 797 728 2,389 2,184
Total defined benefit pension plans 806 742 2,416 2,226
Total other comprehensive income 1,180 825 4,036 2,789
Natural Gas Swap [Member]
        
Before-Tax Amount:        
Loss reclassified to net income 95 259 (92) 1,267
Loss activity recognized in other comprehensive loss (14) (123) 73 (606)
Total swap derivatives 81 136 (19) 661
Tax (Expense) or Benefit:        
Loss reclassified to net income (37) (101) 35 (491)
Loss activity recognized in other comprehensive loss 5 48 (28) 234
Total swap derivatives (32) (53) 7 (257)
Net-of-Tax Amount:        
Loss reclassified to net income 58 158 (57) 776
Loss activity recognized in other comprehensive loss (9) (75) 45 (372)
Total swap derivatives 49 83 (12) 404
Corn Option [Member]
        
Before-Tax Amount:        
Loss reclassified to net income (2,155) 0 (3,063) 0
Loss activity recognized in other comprehensive loss 2,676 0 5,717 0
Total swap derivatives 521 0 2,654 0
Tax (Expense) or Benefit:        
Loss reclassified to net income 835 0 1,187 0
Loss activity recognized in other comprehensive loss (1,031) 0 (2,209) 0
Total swap derivatives (196) 0 (1,022) 0
Net-of-Tax Amount:        
Loss reclassified to net income (1,320) 0 (1,876) 0
Loss activity recognized in other comprehensive loss 1,645 0 3,508 0
Total swap derivatives 325 0 1,632 0
Interest Rate Swap [Member]
        
Before-Tax Amount:        
Total swap derivatives 0 0 0 260
Tax (Expense) or Benefit:        
Total swap derivatives 0 0 0 (101)
Net-of-Tax Amount:        
Total swap derivatives $ 0 $ 0 $ 0 $ 159