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Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012
Before-Tax Amount: |  |  |  |
Amortization of prior service cost | $ 15 | $ 22 | $ 30 | $ 44
Amortization of actuarial loss | 1,300 | 1,189 | 2,600 | 2,378
Total defined benefit pension plans | 1,315 | 1,211 | 2,630 | 2,422
Loss activity recognized in other comprehensive loss | 1,400 | (200) | 3,100 | 500
Other Comprehensive income (loss) | 1,558 | 1,751 | 4,663 | 3,207
Tax (Expense) or Benefit: |  |  |  |
Amortization of prior service cost | (6) | (8) | (12) | (16)
Amortization of actuarial loss | (504) | (461) | (1,008) | (922)
Total defined benefit pension plans | (510) | (469) | (1,020) | (938)
Loss activity recognized in other comprehensive loss | 500 | 100 | 1,200 | (200)
Other Comprehensive income (loss) | (604) | (678) | (1,807) | (1,243)
Net-of-Tax Amount: |  |  |  |
Amortization of prior service cost | 9 | 14 | 18 | 28
Amortization of actuarial loss | 796 | 728 | 1,592 | 1,456
Total defined benefit pension plans | 805 | 742 | 1,610 | 1,484
Total other comprehensive income | 954 | 1,073 | 2,856 | 1,964
Natural Gas Swap [Member] |  |  |  |
Before-Tax Amount: |  |  |  |
Loss reclassified to net income | (244) | 295 | (187) | 1,008
Loss activity recognized in other comprehensive loss | (97) | 217 | 87 | (483)
Total swap derivatives | (341) | 512 | (100) | 525
Tax (Expense) or Benefit: |  |  |  |
Loss reclassified to net income | 94 | (114) | 72 | (390)
Loss activity recognized in other comprehensive loss | 38 | (84) | (33) | 186
Total swap derivatives | 132 | (198) | 39 | (204)
Net-of-Tax Amount: |  |  |  |
Loss reclassified to net income | (150) | 181 | (115) | 618
Loss activity recognized in other comprehensive loss | (59) | 133 | 54 | (297)
Total swap derivatives | (209) | 314 | (61) | 321
Corn Option [Member] |  |  |  |
Before-Tax Amount: |  |  |  |
Loss reclassified to net income | (866) | 0 | (908) | 0
Loss activity recognized in other comprehensive loss | 1,450 | 0 | 3,041 | 0
Total swap derivatives | 584 | 0 | 2,133 | 0
Tax (Expense) or Benefit: |  |  |  |
Loss reclassified to net income | 336 | 0 | 352 | 0
Loss activity recognized in other comprehensive loss | (562) | 0 | (1,178) | 0
Total swap derivatives | (226) | 0 | (826) | 0
Net-of-Tax Amount: |  |  |  |
Loss reclassified to net income | (530) | 0 | (556) | 0
Loss activity recognized in other comprehensive loss | 888 | 0 | 1,863 | 0
Total swap derivatives | 358 | 0 | 1,307 | 0
Interest Rate Swap [Member] |  |  |  |
Before-Tax Amount: |  |  |  |
Total swap derivatives | 0 | 28 | 0 | 260
Tax (Expense) or Benefit: |  |  |  |
Total swap derivatives | 0 | (11) | 0 | (101)
Net-of-Tax Amount: |  |  |  |
Total swap derivatives | $ 0 | $ 17 | $ 0 | $ 159

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