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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

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