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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2021
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, 2021 |  | December 31, 2020 |  | March 31, 2020
Land | $ | 39,874 |  |  | $ | 40,222 |  |  | $ | 40,336 |
Land improvements and leasehold improvements | 96,901 |  |  | 96,700 |  |  | 95,327 |
Buildings and storage facilities | 388,075 |  |  | 387,992 |  |  | 381,258 |
Machinery and equipment | 939,123 |  |  | 925,074 |  |  | 861,812 |
Construction in progress | 16,396 |  |  | 19,725 |  |  | 41,824 |
| 1,480,369 |  |  | 1,469,713 |  |  | 1,420,557 |
Less: accumulated depreciation | 622,100 |  |  | 590,534 |  |  | 498,972 |
Property, plant and equipment, net | $ | 858,269 |  |  | $ | 879,179 |  |  | $ | 921,585 |
Depreciation expense on property, plant and equipment was $32.0 million and $31.0 million for the three months ended March 31, 2021 and 2020, respectively. Rail Assets The components of Rail assets leased to others are as follows:
(in thousands) | March 31, 2021 |  | December 31, 2020 |  | March 31, 2020
Rail assets leased to others | $ | 737,862 |  |  | $ | 750,473 |  |  | $ | 740,809 |
Less: accumulated depreciation | 157,263 |  |  | 158,527 |  |  | 143,740 |
Rail assets, net | $ | 580,599 |  |  | $ | 591,946 |  |  | $ | 597,069 |
Depreciation expense on Rail assets leased to others amounted to $7.7 million for both the three months ended March 31, 2021 and 2020, 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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