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Property, Plant and Equipment (Textual) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | $ 900 |  |
Depreciation expense |  |  | $ 11,500 | $ 11,900 |  | 34,700 | $ 36,000 |
Total impairments |  |  | 0 | 0 |  | 6,272 | 0 |
Grain |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-sale |  | $ 5,300 |  |  | $ 1,600 |  |  |
Total impairments |  |  |  |  |  |  |  | $ 10,900
Impairment of long-lived assets held-for-use |  | $ 5,600 |  |  |  |  |  |
Rail |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment of long-lived assets held-for-use | $ 4,700 |  |  |  |  |  |  |
Depreciation expense on railcar assets leased to others |  |  | $ 6,100 | $ 5,200 |  | $ 18,400 | $ 14,900 |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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