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Business Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) business	Dec. 31, 2017 USD ($) business	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 6,024	$ 6,024	$ 63,934	$ 63,934
Grain
Business Acquisition [Line Items]
Goodwill	$ 1,171		$ 0	$ 0
Grain | Insignificant Acquisition in 2017
Business Acquisition [Line Items]
Number of completed acquisitions | business	1	1
Purchase price of acquisition	$ 2,200	$ 3,500

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Name Accounting Standards Codification
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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.

+ References

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

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The number of businesses acquired by the entity during the period.

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