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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2019
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) | March 31, 2019 |  | December 31, 2018 |  | March 31, 2018
Land | $ | 39,552 |  |  | $ | 29,739 |  |  | $ | 29,915 |
Land improvements and leasehold improvements | 82,681 |  |  | 68,826 |  |  | 69,320 |
Buildings and storage facilities | 337,631 |  |  | 284,998 |  |  | 285,084 |
Machinery and equipment | 481,454 |  |  | 393,640 |  |  | 377,563 |
Construction in progress | 151,895 |  |  | 102,394 |  |  | 15,116 |
| 1,093,213 |  |  | 879,597 |  |  | 776,998 |
Less: accumulated depreciation | 421,408 |  |  | 402,886 |  |  | 383,235 |
| $ | 671,805 |  |  | $ | 476,711 |  |  | $ | 393,763 |
Capitalized interest totaled $1.1 million and $1.7 million for the three months ended March 31, 2019 and year-ended December 31, 2018, respectively. Depreciation expense on property, plant and equipment was $17.9 million and $11.6 million for the three months ended March 31, 2019 and 2018, respectively. Rail Group Assets The components of Rail Group assets leased to others are as follows:
(in thousands) | March 31, 2019 |  | December 31, 2018 |  | March 31, 2018
Rail Group assets leased to others | $ | 660,747 |  |  | $ | 640,349 |  |  | $ | 577,678 |
Less: accumulated depreciation | 123,118 |  |  | 118,564 |  |  | 115,425 |
| $ | 537,629 |  |  | $ | 521,785 |  |  | $ | 462,253 |
Depreciation expense on Rail Group assets leased to others amounted to $6.7 million and $6.2 million for the three months ended March 31, 2019 and 2018, respectively.

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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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