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Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 1,317,007
Accumulated impairment losses	(15,914)
Goodwill	1,301,093
Goodwill acquired during year	19,554
Goodwill disposed of during year	(61,088)
Goodwill impaired during year	(461)
Foreign currency translation	(26,134)
Goodwill	1,249,339
Accumulated impairment losses	(16,375)
Goodwill	1,232,964
Feed Ingredients
Goodwill [Roll Forward]
Goodwill	848,167
Accumulated impairment losses	(15,914)
Goodwill	832,253
Goodwill acquired during year	19,554
Goodwill disposed of during year	(61,088)
Goodwill impaired during year	0
Foreign currency translation	(15,342)
Goodwill	791,291
Accumulated impairment losses	(15,914)
Goodwill	775,377
Fuel Ingredients
Goodwill [Roll Forward]
Goodwill	124,369
Accumulated impairment losses	0
Goodwill	124,369
Goodwill acquired during year	0
Goodwill disposed of during year	0
Goodwill impaired during year	0
Foreign currency translation	(4,309)
Goodwill	120,060
Accumulated impairment losses	0
Goodwill	120,060
Food Ingredients
Goodwill [Roll Forward]
Goodwill	344,471
Accumulated impairment losses	0
Goodwill	344,471
Goodwill acquired during year	0
Goodwill disposed of during year	0
Goodwill impaired during year	(461)
Foreign currency translation	(6,483)
Goodwill	337,988
Accumulated impairment losses	(461)
Goodwill	$ 337,527

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