Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 1,314,180	$ 1,241,807
Accumulated impairment losses	(15,914)	(15,914)
Goodwill	1,298,266	1,225,893
Goodwill acquired during year	1,880
Foreign currency translation	70,493
Feed Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	849,809	813,621
Accumulated impairment losses	(15,914)	(15,914)
Goodwill	833,895	797,707
Goodwill acquired during year	1,880
Foreign currency translation	34,308
Fuel Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	123,277	111,178
Accumulated impairment losses	0	0
Goodwill	123,277	111,178
Goodwill acquired during year	0
Foreign currency translation	12,099
Food Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	341,094	317,008
Accumulated impairment losses	0	0
Goodwill	341,094	$ 317,008
Goodwill acquired during year	0
Foreign currency translation	$ 24,086

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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