Other Comprehensive Income (Schedule of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Before-Tax Amount:
Amortization of prior service cost	$ 9	$ 9
Amortization of actuarial loss	1,146	888
Total defined benefit pension plans	1,155	897
Foreign currency translation	(5,393)	17,295
Other Comprehensive income (loss)	(7,172)	16,057
Tax (Expense) or Benefit:
Amortization of prior service cost	(3)	(3)
Amortization of actuarial loss	(294)	(227)
Total defined benefit pension plans	(297)	(230)
Foreign currency translation	507	0
Other Comprehensive income (loss)	1,207	322
Net-of-Tax Amount:
Amortization of prior service cost	6	6
Amortization of actuarial loss	852	661
Total defined benefit pension plans	858	667
Total swap derivatives	(1,937)
Foreign currency translation	(4,886)	17,295
Net current-period other comprehensive income	(5,965)	16,379
Natural Gas Swap [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	0	14
Gain (loss) activity recognized in other comprehensive loss	0	16
Total swap derivatives	0	30
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	0	(4)
Gain (loss) activity recognized in other comprehensive loss	0	(4)
Total swap derivatives	0	(8)
Net-of-Tax Amount:
Loss (gain) reclassified to net income	0	10
Gain (loss) activity recognized in other comprehensive loss	0	12
Total swap derivatives	0	22
Corn Option [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	0	(668)
Gain (loss) activity recognized in other comprehensive loss	0	(1,497)
Total swap derivatives	0	(2,165)
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	0	173
Gain (loss) activity recognized in other comprehensive loss	0	387
Total swap derivatives	0	560
Net-of-Tax Amount:
Loss (gain) reclassified to net income	0	(495)
Gain (loss) activity recognized in other comprehensive loss	0	(1,110)
Total swap derivatives	0	(1,605)
Foreign Exchange Contract [Member]
Before-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	(2,934)	0
Total swap derivatives	(2,934)	0
Tax (Expense) or Benefit:
Gain (loss) activity recognized in other comprehensive loss	997	0
Total swap derivatives	997	0
Net-of-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	(1,937)	0
Total swap derivatives	(1,937)	0
Accumulated Other Comprehensive Income (Loss) [Member]
Net-of-Tax Amount:
Total swap derivatives	(1,937)
Foreign currency translation	$ (6,645)	$ 16,778