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Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 30, 2013 | Mar. 31, 2012
Before-Tax Amount: |  |
Amortization of prior service cost | $ 15 | $ 22
Amortization of actuarial loss | 1,300 | 1,189
Total defined benefit pension plans | 1,315 | 1,211
Loss activity recognized in other comprehensive loss | 1,800 | 700
Other Comprehensive income (loss) | 3,105 | 1,456
Tax (Expense) or Benefit: |  |
Amortization of prior service cost | (6) | (8)
Amortization of actuarial loss | (504) | (461)
Total defined benefit pension plans | (510) | (469)
Loss activity recognized in other comprehensive loss | 700 | (300)
Other Comprehensive income (loss) | (1,203) | (565)
Net-of-Tax Amount: |  |
Amortization of prior service cost | 9 | 14
Amortization of actuarial loss | 796 | 728
Total defined benefit pension plans | 805 | 742
Total other comprehensive income | 1,902 | 891
Natural Gas Swap [Member] |  |
Before-Tax Amount: |  |
Loss reclassified to net income | 57 | 713
Loss activity recognized in other comprehensive loss | 184 | (700)
Total swap derivatives | 241 | 13
Tax (Expense) or Benefit: |  |
Loss reclassified to net income | (22) | (276)
Loss activity recognized in other comprehensive loss | (71) | 270
Total swap derivatives | (93) | (6)
Net-of-Tax Amount: |  |
Loss reclassified to net income | 35 | 437
Loss activity recognized in other comprehensive loss | 113 | (430)
Total swap derivatives | 148 | 7
Corn Option [Member] |  |
Before-Tax Amount: |  |
Loss reclassified to net income | (42) | 0
Loss activity recognized in other comprehensive loss | 1,591 | 0
Total swap derivatives | 1,549 | 0
Tax (Expense) or Benefit: |  |
Loss reclassified to net income | 16 | 0
Loss activity recognized in other comprehensive loss | (616) | 0
Total swap derivatives | (600) | 0
Net-of-Tax Amount: |  |
Loss reclassified to net income | (26) | 0
Loss activity recognized in other comprehensive loss | 975 | 0
Total swap derivatives | 949 | 0
Interest Rate Swap [Member] |  |
Before-Tax Amount: |  |
Total swap derivatives | 0 | 232
Tax (Expense) or Benefit: |  |
Total swap derivatives | 0 | (90)
Net-of-Tax Amount: |  |
Total swap derivatives | $ 0 | $ 142

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