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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The components of Property, plant and equipment, net are as follows:
(in thousands) | September 30, 2018 |  | December 31, 2017 |  | September 30, 2017
Land | $ | 29,545 |  |  | $ | 22,388 |  |  | $ | 23,342 |
Land improvements and leasehold improvements | 68,859 |  |  | 69,127 |  |  | 71,559 |
Buildings and storage facilities | 282,826 |  |  | 284,820 |  |  | 298,951 |
Machinery and equipment | 380,109 |  |  | 373,127 |  |  | 384,422 |
Construction in progress | 65,539 |  |  | 7,502 |  |  | 7,703 |
| 826,878 |  |  | 756,964 |  |  | 785,977 |
Less: accumulated depreciation | 392,373 |  |  | 372,287 |  |  | 366,629 |
| $ | 434,505 |  |  | $ | 384,677 |  |  | $ | 419,348 |
Capitalized interest totaled $0.9 million for the nine months ended September 30, 2018. Depreciation expense on property, plant and equipment was $34.7 million and $36.0 million for the nine months ended September 30, 2018 and 2017, respectively. Additionally, depreciation expense on property, plant and equipment was $11.5 million and $11.9 million for the three months ended September 30, 2018 and 2017, respectively. In June 2018, the Company recorded charges totaling $1.6 million for impairment of property, plant and equipment in the Grain segment related to assets that were reclassified as assets held for sale at June 30, 2018 and were sold in the third quarter. In December 2017, the Company recorded charges totaling $10.9 million for impairment of property, plant and equipment in the Grain segment, of which $5.6 million relates to assets that are deemed held and used and $5.3 million related to assets that have been reclassified as assets held for sale at December 31, 2017. The Company wrote down the value of these assets to the extent their carrying amounts exceeded fair value. The Company classified the significant assumptions used to determine the fair value of the impaired assets as Level 3 inputs in the fair value hierarchy. Rail Group Assets The components of Rail Group assets leased to others are as follows:
(in thousands) | September 30, 2018 |  | December 31, 2017 |  | September 30, 2017
Rail Group assets leased to others | $ | 576,622 |  |  | $ | 531,391 |  |  | $ | 484,214 |
Less: accumulated depreciation | 111,846 |  |  | 107,948 |  |  | 106,821 |
| $ | 464,776 |  |  | $ | 423,443 |  |  | $ | 377,393 |
Depreciation expense on Rail Group assets leased to others amounted to $18.4 million and $14.9 million for the nine months ended September 30, 2018 and 2017, respectively. Additionally, depreciation expense on Rail Group assets leased to others amounted to $6.1 million and $5.2 million for the three months ended September 30, 2018 and 2017, respectively. In June 2018, the Company recorded charges totaling $4.7 million related to Rail Group assets leased to others that have been reclassified as assets held for sale at June 30, 2018. The Company classified the significant assumptions used to determine the fair value of the impaired assets as Level 3 inputs in the fair value hierarchy.Sale of Assets The Company closed on an agreement to sell its grain elevators in Humboldt, Kenton and Dyer, Tennessee for $19.5 million plus working capital during the second quarter of 2018 and its Como location for $1.3 million plus working capital during the third quarter of 2018. During the third quarter of 2018, the Company also closed on an agreement to sell one of its convertible preferred security investments for $6.4 million and recorded a pre-tax gain of $3.9 million in Other income, net. The Company sold two of its retail properties during the third quarter of 2017 for $7.6 million and recorded a $5.7 million gain in Other income, net. On March 31, 2017 the Company sold four farm center locations in Florida for $17.4 million and recorded a $4.7 million gain, net of transaction costs in Other income, net. The sale price included a working capital adjustment of $3.6 million.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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