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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 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) | June 30, 2019 |  | December 31, 2018 |  | June 30, 2018
Land | $ | 39,241 |  |  | $ | 29,739 |  |  | $ | 29,579 |
Land improvements and leasehold improvements | 84,127 |  |  | 68,826 |  |  | 68,384 |
Buildings and storage facilities | 327,418 |  |  | 284,998 |  |  | 280,226 |
Machinery and equipment | 514,030 |  |  | 393,640 |  |  | 377,202 |
Construction in progress | 164,532 |  |  | 102,394 |  |  | 37,456 |
| 1,129,348 |  |  | 879,597 |  |  | 792,847 |
Less: accumulated depreciation | 433,521 |  |  | 402,886 |  |  | 384,272 |
| $ | 695,827 |  |  | $ | 476,711 |  |  | $ | 408,575 |
Depreciation expense on property, plant and equipment was $32.7 million and $23.2 million for the six months ended June 30, 2019 and 2018, respectively. Additionally, depreciation expense on property, plant and equipment was $15.0 million and $11.5 million for the three months ended June 30, 2019 and 2018, respectively. In the second quarter of 2019, the Company recorded a $3.1 million impairment charge related to its remaining Tennessee facilities in the Trade group. The Company wrote down the value of these assets to the extent their carrying values exceeded their 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) | June 30, 2019 |  | December 31, 2018 |  | June 30, 2018
Rail Group assets leased to others | $ | 688,320 |  |  | $ | 640,349 |  |  | $ | 564,555 |
Less: accumulated depreciation | 128,609 |  |  | 118,564 |  |  | 106,131 |
| $ | 559,711 |  |  | $ | 521,785 |  |  | $ | 458,424 |
Depreciation expense on Rail Group assets leased to others amounted to $13.7 million and $12.2 million for the six months ended June 30, 2019 and 2018, respectively. Additionally, depreciation expense on Rail Group assets leased to others amounted to $7.0 million and $6.0 million for the three months ended June 30, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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