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Other Comprehensive Income (Schedule of OCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Mar. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Before-Tax Amount: |  |  |  |  |  |
Amortization of prior service cost | $ 9 |  | $ 8 |  | $ 18 | $ 17
Amortization of actuarial loss | 1,147 |  | 888 |  | 2,293 | 1,776
Total defined benefit pension plans | 1,156 |  | 896 |  | 2,311 | 1,793
Foreign currency translation | 16,652 |  | (77,953) |  |  |
Other Comprehensive income (loss) | 22,853 |  | (76,456) |  | 15,681 | (60,399)
Tax (Expense) or Benefit: |  |  |  |  |  |
Amortization of prior service cost | (2) |  | (1) |  | (5) | (4)
Amortization of actuarial loss | (295) |  | (229) |  | (589) | (456)
Total defined benefit pension plans | (297) |  | (230) |  | (594) | (460)
Foreign currency translation | (326) |  | 1,116 |  |  |
Other Comprehensive income (loss) | (2,062) |  | 732 |  | (855) | 1,054
Net-of-Tax Amount: |  |  |  |  |  |
Amortization of prior service cost | 7 |  | 7 |  | 13 | 13
Amortization of actuarial loss | 852 |  | 659 |  | 1,704 | 1,320
Total defined benefit pension plans | 859 |  | 666 |  | 1,717 | 1,333
Foreign currency translation | 16,326 | $ (4,886) | (76,837) | $ 17,295 | 11,440 | (59,542)
Net current-period other comprehensive income | 20,791 |  | (75,724) |  | 14,826 | (59,345)
Natural Gas Swap [Member] |  |  |  |  |  |
Before-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | 0 |  | 0 |  | 0 | 14
Gain (loss) activity recognized in other comprehensive loss | 0 |  | (1) |  | 0 | 15
Total swap derivatives | 0 |  | (1) |  | 0 | 29
Tax (Expense) or Benefit: |  |  |  |  |  |
Loss (gain) reclassified to net income | 0 |  | 1 |  | 0 | (3)
Gain (loss) activity recognized in other comprehensive loss | 0 |  | 0 |  | 0 | (4)
Total swap derivatives | 0 |  | 1 |  | 0 | (7)
Net-of-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | 0 |  | 1 |  | 0 | 11
Gain (loss) activity recognized in other comprehensive loss | 0 |  | (1) |  | 0 | 11
Total swap derivatives | 0 |  | 0 | 22 | 0 | 22
Corn Option [Member] |  |  |  |  |  |
Before-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | (37) |  | (323) |  | (37) | (991)
Gain (loss) activity recognized in other comprehensive loss | 67 |  | 925 |  | 67 | (572)
Total swap derivatives | 30 |  | 602 |  | 30 | (1,563)
Tax (Expense) or Benefit: |  |  |  |  |  |
Loss (gain) reclassified to net income | 10 |  | 84 |  | 10 | 257
Gain (loss) activity recognized in other comprehensive loss | (18) |  | (239) |  | (18) | 148
Total swap derivatives | (8) |  | (155) |  | (8) | 405
Net-of-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | (27) |  | (239) |  | (27) | (734)
Gain (loss) activity recognized in other comprehensive loss | 49 |  | 686 |  | 49 | (424)
Total swap derivatives | 22 |  | 447 | (1,605) | 22 | (1,158)
Heating Oil Swaps And Options [Member] |  |  |  |  |  |
Before-Tax Amount: |  |  |  |  |  |
Gain (loss) activity recognized in other comprehensive loss | 2,874 |  | 0 |  | 2,874 | 0
Total swap derivatives | 2,874 |  | 0 |  | 2,874 | 0
Tax (Expense) or Benefit: |  |  |  |  |  |
Gain (loss) activity recognized in other comprehensive loss | (741) |  | 0 |  | (741) | 0
Total swap derivatives | (741) |  | 0 |  | (741) | 0
Net-of-Tax Amount: |  |  |  |  |  |
Gain (loss) activity recognized in other comprehensive loss | 2,133 |  | 0 |  | 2,133 | 0
Total swap derivatives | 2,133 |  | 0 |  | 2,133 | 0
Foreign Exchange Contract [Member] |  |  |  |  |  |
Before-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | 287 |  | 0 |  | 287 | 0
Gain (loss) activity recognized in other comprehensive loss | 1,854 |  | 0 |  | (1,080) | 0
Total swap derivatives | 2,141 |  | 0 |  | (793) | 0
Tax (Expense) or Benefit: |  |  |  |  |  |
Loss (gain) reclassified to net income | (111) |  | 0 |  | (111) | 0
Gain (loss) activity recognized in other comprehensive loss | (579) |  | 0 |  | 418 | 0
Total swap derivatives | (690) |  | 0 |  | 307 | 0
Net-of-Tax Amount: |  |  |  |  |  |
Loss (gain) reclassified to net income | 176 |  | 0 |  | 176 | 0
Gain (loss) activity recognized in other comprehensive loss | 1,275 |  | 0 |  | (662) | 0
Total swap derivatives | 1,451 | (1,937) | 0 |  | (486) | 0
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Before-Tax Amount: |  |  |  |  |  |
Foreign currency translation |  |  |  |  | 11,259 | (60,658)
Tax (Expense) or Benefit: |  |  |  |  |  |
Foreign currency translation |  |  |  |  | 181 | 1,116
Net-of-Tax Amount: |  |  |  |  |  |
Foreign currency translation | 17,797 | (6,645) | (76,787) | 16,778 | $ 11,440 | $ (59,542)
Accumulated Other Comprehensive Income (Loss) [Member] | Natural Gas Swap [Member] |  |  |  |  |  |
Net-of-Tax Amount: |  |  |  |  |  |
Total swap derivatives |  |  |  | 22 |  |
Accumulated Other Comprehensive Income (Loss) [Member] | Corn Option [Member] |  |  |  |  |  |
Net-of-Tax Amount: |  |  |  |  |  |
Total swap derivatives | 22 |  | $ 447 | $ (1,605) |  |
Accumulated Other Comprehensive Income (Loss) [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |
Net-of-Tax Amount: |  |  |  |  |  |
Total swap derivatives | $ 1,451 | $ (1,937) |  |  |  |

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