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Other Comprehensive Income (Schedule of OCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Before-Tax Amount:        
Amortization of prior service cost $ 8 $ 9 $ 17 $ 18
Amortization of actuarial loss 888 1,203 1,776 2,406
Total defined benefit pension plans 896 1,212 1,793 2,424
Other Comprehensive income (loss) (76,456) 48,904 (60,399) 63,995
Tax (Expense) or Benefit:        
Amortization of prior service cost (1) (2) (4) (5)
Amortization of actuarial loss (229) (450) (456) (900)
Total defined benefit pension plans (230) (452) (460) (905)
Other Comprehensive income (loss) 732 99 1,054 344
Net-of-Tax Amount:        
Amortization of prior service cost 7 7 13 13
Amortization of actuarial loss 659 753 1,320 1,506
Total defined benefit pension plans 666 760 1,333 1,519
Foreign currency translation (76,837) 49,112 (59,542) 64,791
Net current-period other comprehensive income (75,724) 49,003 (59,345) 64,339
Natural Gas Swap [Member]        
Before-Tax Amount:        
Loss (gain) reclassified to net income 0 0 14 0
Gain (loss) activity recognized in other comprehensive loss (1) 0 15 0
Total swap derivatives (1) 0 29 0
Tax (Expense) or Benefit:        
Loss (gain) reclassified to net income 1 0 (3) 0
Gain (loss) activity recognized in other comprehensive loss 0 0 (4) 0
Total swap derivatives 1 0 (7) 0
Net-of-Tax Amount:        
Loss (gain) reclassified to net income 1 0 11 0
Gain (loss) activity recognized in other comprehensive loss (1) 0 11 0
Total swap derivatives 0 0 22 0
Corn Option [Member]        
Before-Tax Amount:        
Loss (gain) reclassified to net income (323) (1,213) (991) (2,398)
Gain (loss) activity recognized in other comprehensive loss 925 (207) (572) (822)
Total swap derivatives 602 (1,420) (1,563) (3,220)
Tax (Expense) or Benefit:        
Loss (gain) reclassified to net income 84 470 257 930
Gain (loss) activity recognized in other comprehensive loss (239) 81 148 319
Total swap derivatives (155) 551 405 1,249
Net-of-Tax Amount:        
Loss (gain) reclassified to net income (239) (743) (734) (1,468)
Gain (loss) activity recognized in other comprehensive loss 686 (126) (424) (503)
Total swap derivatives 447 (869) (1,158) (1,971)
Accumulated Other Comprehensive Income (Loss) [Member]        
Before-Tax Amount:        
Foreign currency translation (77,953) 49,112 (60,658) 64,791
Tax (Expense) or Benefit:        
Foreign currency translation 1,116 0 1,116 0
Net-of-Tax Amount:        
Foreign currency translation $ (76,837) $ 49,112 $ (59,542) $ 64,791