Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 1,006,959		$ 423,593	$ 1,938,394	$ 869,015
Cost of sales and operating expenses	747,966		309,922	1,492,945	632,608
Selling, general and administrative expenses	111,845		40,793	217,248	83,086
Depreciation and amortization	67,498		22,076	133,167	43,943
Operating income	75,485		50,802	74,921	109,378
Equity in net income/ (loss) of unconsolidated subsidiaries	2,040		(1,962)	7,117	(3,157)
Nonoperating Income (Expense)	(27,447)		(6,087)	(101,256)	(10,645)
Income/ (loss) before income taxes	50,078		42,753	(19,218)	95,576
Assets	5,554,795			5,554,795		3,244,133
Feed Ingredients [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	599,884		421,366	1,169,687	865,148
Cost of sales and operating expenses	431,549	442,666	308,326	869,197	629,659
Gross Margin	168,335		113,040	300,490	235,489
Selling, general and administrative expenses	53,963	55,749	33,108	110,167	67,194
Acquisition and integration costs	0		0	0	0
Depreciation and amortization	39,866		21,535	78,425	42,173
Operating income	74,506		58,397	111,898	126,122
Equity in net income/ (loss) of unconsolidated subsidiaries	561		0	964	0
Segment income	75,067		58,397	112,862	126,122
Assets	2,786,197			2,786,197		1,986,564
Food Ingredients [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	329,541		0	624,824	0
Cost of sales and operating expenses	256,153	229,838	0	512,148	0
Gross Margin	73,388		0	112,676	0
Selling, general and administrative expenses	42,447	33,315	0	76,437	0
Acquisition and integration costs	0		0	0	0
Depreciation and amortization	19,628		0	37,069	0
Operating income	11,313		0	(830)	0
Equity in net income/ (loss) of unconsolidated subsidiaries	0		0	0	0
Segment income	11,313		0	(830)	0
Assets	1,881,335			1,881,335		0
Fuel Ingredients [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	77,534		2,227	143,883	3,867
Cost of sales and operating expenses	60,278	72,596	1,679	111,630	3,040
Gross Margin	17,256		548	32,253	827
Selling, general and administrative expenses	5,998	6,396	95	11,133	191
Acquisition and integration costs	0		0	0	0
Depreciation and amortization	5,819		31	13,196	62
Operating income	5,439		422	7,924	574
Equity in net income/ (loss) of unconsolidated subsidiaries	1,479		(1,962)	6,153	(3,157)
Segment income	6,918		(1,540)	14,077	(2,583)
Assets	743,597			743,597		179,722
Corporate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	0		0	0	0
Cost of sales and operating expenses	(14)	(121)	(83)	(30)	(91)
Gross Margin	14		83	30	91
Selling, general and administrative expenses	9,437	9,943	7,590	19,511	15,701
Acquisition and integration costs	4,165		0	20,113	0
Depreciation and amortization	2,185		510	4,477	1,708
Operating income	(15,773)		(8,017)	(44,071)	(17,318)
Equity in net income/ (loss) of unconsolidated subsidiaries	0		0	0	0
Segment income	(15,773)		(8,017)	(44,071)	(17,318)
Assets	143,666			143,666		1,077,847
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,006,959		423,593	1,938,394	869,015
Cost of sales and operating expenses	747,966	744,979	309,922	1,492,945	632,608
Gross Margin	258,993		113,671	445,449	236,407
Selling, general and administrative expenses	111,845	105,403	40,793	217,248	83,086
Acquisition and integration costs	4,165		0	20,113	0
Depreciation and amortization	67,498		22,076	133,167	43,943
Operating income	75,485		50,802	74,921	109,378
Equity in net income/ (loss) of unconsolidated subsidiaries	2,040		(1,962)	7,117	(3,157)
Segment income	77,525		48,840	82,038	106,221
Assets	$ 5,554,795			$ 5,554,795		$ 3,244,133