Consolidated Statements of Stockholders’ Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Interest Rate Swap [Member]	Interest Rate Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Interest Rate Swap [Member] Parent [Member]	Natural Gas Swap [Member]	Natural Gas Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Natural Gas Swap [Member] Parent [Member]	Corn Option [Member]	Corn Option [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Corn Option [Member] Parent [Member]
Balance at Dec. 31, 2011	$ 920,375	$ 1,176	$ 587,685	$ (5,588)	$ (30,904)	$ 368,006	$ 920,375	$ 0
Balance (in shares) at Dec. 31, 2011		117,048,438
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	130,770					130,770	130,770
Pension adjustments	(1,169)				(1,169)		(1,169)
Total natural gas derivatives									159	159	159	391	391	391	194	194	194
Issuance of non-vested stock (in shares)		486,697
Issuance of non-vested stock	6,813	5	6,808				6,813
Stock-based compensation	3,727		3,727				3,727
Tax benefits associated with stock-based compensation	2,652		2,652				2,652
Treasury stock (in shares)		(264,275)
Treasury stock	(4,445)			(4,445)			(4,445)
Issuance of common stock (in shares)		544,131
Issuance of common stock	2,969	5	2,964				2,969
Balance at Dec. 29, 2012	1,062,436	1,186	603,836	(10,033)	(31,329)	498,776	1,062,436	0
Balance (in shares) at Dec. 29, 2012		117,814,991
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,020,952
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	108,967					108,967	108,967
Pension adjustments	15,140				15,140		15,140
Total natural gas derivatives									0			127	127	127	1,141	1,141	1,141
Foreign currency translation adjustments	(14,502)				(14,502)		(14,502)
Issuance of non-vested stock (in shares)		387,681
Issuance of non-vested stock	6,539	4	6,535				6,539
Stock-based compensation	50		50				50
Tax benefits associated with stock-based compensation	1,138		1,138				1,138
Treasury stock (in shares)		(185,919)
Treasury stock	(3,238)			(3,238)			(3,238)
Issuance of common stock (in shares)		46,250,672
Issuance of common stock	843,154	463	842,691				843,154
Balance at Dec. 28, 2013	2,020,952	1,653	1,454,250	(13,271)	(29,423)	607,743	2,020,952	0
Balance (in shares) at Dec. 28, 2013		164,267,425
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,051,134
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	90,919							90,919
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	68,311					64,215	64,215	4,096
Distribution of noncontrolling interest earnings	(4,272)							(4,272)
Additions to noncontrolling interests	1,201							1,201
Pension adjustments	(20,381)				(20,381)		(20,381)
Total natural gas derivatives									0			(113)	(113)	(113)	(1,259)	(1,259)	(1,259)
Foreign currency translation adjustments	(119,684)				(125,884)		(125,884)	6,200
Issuance of non-vested stock (in shares)		209,827
Issuance of non-vested stock	4,371	2	4,369				4,371
Stock-based compensation	9,993		9,993				9,993
Tax benefits associated with stock-based compensation	2,420		2,420				2,420
Treasury stock (in shares)		(507,552)
Treasury stock	(9,936)			(9,936)			(9,936)
Issuance of common stock (in shares)		742,963
Issuance of common stock	8,612	7	8,605				8,612
Balance at Jan. 03, 2015	$ 1,952,990	$ 1,662	$ 1,479,637	$ (23,207)	$ (177,060)	$ 671,958	$ 1,952,990	$ 98,144
Balance (in shares) at Jan. 03, 2015		164,712,663