Other Comprehensive Income (Schedule of OCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Before-Tax Amount:
Amortization of prior service cost	$ 9	$ 8	$ 27	$ 22
Amortization of actuarial loss	1,204	1,168	3,610	3,502
Amortization of settlement	0	0	0	(123)
Total defined benefit pension plans	1,213	1,176	3,637	3,401
Gain (loss) activity recognized in other comprehensive loss	2,800		2,000
Other Comprehensive income (loss)	48,848	(3,464)	112,843	49,136
Tax (Expense) or Benefit:
Amortization of prior service cost	(3)	(2)	(8)	(7)
Amortization of actuarial loss	(451)	(447)	(1,351)	(1,338)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Amortization of Settlement, Tax	0	0	0	48
Total defined benefit pension plans	(454)	(449)	(1,359)	(1,297)
Gain (loss) activity recognized in other comprehensive loss	1,100	800	800	2,000
Other Comprehensive income (loss)	(1,006)	(914)	(662)	(2,093)
Net-of-Tax Amount:
Amortization of prior service cost	6	6	19	15
Amortization of actuarial loss	753	721	2,259	2,164
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Amortization of Settlement, Net of Tax	0	0	0	(75)
Total defined benefit pension plans	759	727	2,278	2,104
Gain (loss) activity recognized in other comprehensive loss		2,100		5,300
Foreign currency translation	46,211	(5,839)	111,002	43,684
Net current-period other comprehensive income	47,842	(4,378)	112,181	47,043
Natural Gas Swap [Member]
Before-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	36	0	36	0
Total swap derivatives	36	0	36	0
Tax (Expense) or Benefit:
Gain (loss) activity recognized in other comprehensive loss	(14)	0	(14)	0
Total swap derivatives	(14)	0	(14)	0
Net-of-Tax Amount:
Gain (loss) activity recognized in other comprehensive loss	22	0	22	0
Total swap derivatives	22	0	22	0
Corn Option [Member]
Before-Tax Amount:
Loss (gain) reclassified to net income	(1,352)	(861)	(3,750)	(3,204)
Gain (loss) activity recognized in other comprehensive loss	2,740	2,060	1,918	5,255
Total swap derivatives	1,388	1,199	(1,832)	2,051
Tax (Expense) or Benefit:
Loss (gain) reclassified to net income	525	334	1,455	1,243
Gain (loss) activity recognized in other comprehensive loss	(1,063)	(799)	(744)	(2,039)
Total swap derivatives	(538)	(465)	711	(796)
Net-of-Tax Amount:
Loss (gain) reclassified to net income	(827)	(527)	(2,295)	(1,961)
Gain (loss) activity recognized in other comprehensive loss	1,677	1,261	1,174	3,216
Total swap derivatives	850	734	(1,121)	1,255
Accumulated Other Comprehensive Income (Loss) [Member]
Before-Tax Amount:
Foreign currency translation	46,211	(5,839)	111,002	43,684
Tax (Expense) or Benefit:
Foreign currency translation	0	0	0	0
Net-of-Tax Amount:
Foreign currency translation	$ 46,211	$ (5,839)	$ 111,002	$ 43,684