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Goodwill and Other Intangible Assets (Changes in goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |  |  |  |
Goodwill at beginning of period |  |  | $ 63,934 | $ 72,365 | $ 58,554
Acquisitions |  |  | 0 | 47,735 | 13,811
Impairments |  |  | 0 | (56,166) | 0
Goodwill at end of period | $ 63,934 |  | 63,934 | 63,934 | 72,365
Grain |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill at beginning of period |  |  | 0 | 46,422 | 38,165
Acquisitions |  |  | 0 | 0 | 8,257
Impairments | (54,200) |  |  | (46,422) |
Goodwill at end of period | 0 |  | 0 | 0 | 46,422
Plant Nutrient |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill at beginning of period |  |  | 59,767 | 21,776 | 16,222
Acquisitions |  |  | 0 | 47,735 | 5,554
Impairments |  | $ (2,000) |  | (9,744) |
Goodwill at end of period | 59,767 |  | 59,767 | 59,767 | 21,776
Rail |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill at beginning of period |  |  | 4,167 | 4,167 | 4,167
Acquisitions |  |  | 0 | 0 | 0
Impairments |  |  |  | 0 |
Goodwill at end of period | $ 4,167 |  | $ 4,167 | $ 4,167 | $ 4,167

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- Definition 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 -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 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References 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 + Details
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- Definition Amount of loss from the write-down of an asset representing the 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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