Derivatives (Gain (Loss) on Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Oct. 01, 2016		Sep. 30, 2017	Oct. 01, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 2,776		$ 2,060		$ 1,954	$ 5,255
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	1,352		861		3,750	3,204
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	1,689		323		384	537
Gain (loss) activity recognized in other comprehensive loss	2,800				2,000
Gain (loss) activity recognized in other comprehensive loss			2,100			5,300
Gain (loss) activity recognized in other comprehensive loss	1,100		800		800	2,000
Corn Option [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) activity recognized in other comprehensive loss	2,740		2,060		1,918	5,255
Gain (loss) activity recognized in other comprehensive loss	1,677		1,261		1,174	3,216
Gain (loss) activity recognized in other comprehensive loss	(1,063)		(799)		(744)	(2,039)
Corn Option [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	2,740		2,060		1,918	5,255
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	1,352		861		3,750	3,204
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	1,655		323		350	537
Natural Gas Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) activity recognized in other comprehensive loss	36		0		36	0
Gain (loss) activity recognized in other comprehensive loss	22		0		22	0
Gain (loss) activity recognized in other comprehensive loss	(14)		0		(14)	0
Natural Gas Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	36	[1]	0	[1]	36	0
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	[2]	0	[2]	0	0
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 34	[3]	$ 0	[3]	$ 34	$ 0

[1] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $2.8 million and $2.1 million recorded net of taxes of approximately $(1.1) million and $(0.8) million as of September 30, 2017 and October 1, 2016, respectively.

[2] Gains and (losses) reclassified from accumulated OCI into income (effective portion) for corn options are included in cost of sales, respectively, in the Company’s consolidated statements of operations.

[3] Gains and (losses) recognized in income on derivatives (ineffective portion) for corn options are included in other income/ (expense), net in the Company’s consolidated statements of operations.