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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 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) | June 30, 2021 |  | December 31, 2020 |  | June 30, 2020
Land | $ | 39,884 |  |  | $ | 40,222 |  |  | $ | 40,188 |
Land improvements and leasehold improvements | 97,454 |  |  | 96,700 |  |  | 96,028 |
Buildings and storage facilities | 386,832 |  |  | 387,992 |  |  | 377,652 |
Machinery and equipment | 948,517 |  |  | 925,074 |  |  | 881,144 |
Construction in progress | 19,987 |  |  | 19,725 |  |  | 35,982 |
| 1,492,674 |  |  | 1,469,713 |  |  | 1,430,994 |
Less: accumulated depreciation | 650,912 |  |  | 590,534 |  |  | 524,977 |
Property, plant and equipment, net | $ | 841,762 |  |  | $ | 879,179 |  |  | $ | 906,017 |
Depreciation expense on property, plant and equipment was $64.2 million and $62.3 million for the six months ended June 30, 2021 and 2020, respectively. Additionally, depreciation expense on property, plant and equipment was $32.3 million and $31.2 million for the three months ended June 30, 2021 and 2020, respectively. Rail Assets The components of Rail assets leased to others are as follows:
(in thousands) | June 30, 2021 |  | December 31, 2020 |  | June 30, 2020
Rail assets leased to others | $ | 735,255 |  |  | $ | 750,473 |  |  | $ | 742,107 |
Less: accumulated depreciation | 160,670 |  |  | 158,527 |  |  | 149,286 |
Rail assets, net | $ | 574,585 |  |  | $ | 591,946 |  |  | $ | 592,821 |
Depreciation expense on Rail assets leased to others amounted to $15.3 million and $15.4 million for the six months ended June 30, 2021 and 2020, respectively. Additionally, depreciation expense on Rail assets leased to others amounted to $7.6 million and $7.7 million for the three months ended June 30, 2021 and 2020, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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