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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2022
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, 2022 |  | December 31, 2021 |  | June 30, 2021
Land | $ | 38,630 |  |  | $ | 39,162 |  |  | $ | 39,367 |
Land improvements and leasehold improvements | 91,542 |  |  | 91,122 |  |  | 93,166 |
Buildings and storage facilities | 370,453 |  |  | 368,577 |  |  | 377,946 |
Machinery and equipment | 949,142 |  |  | 936,476 |  |  | 921,190 |
Construction in progress | 31,237 |  |  | 20,676 |  |  | 19,723 |
| 1,481,004 |  |  | 1,456,013 |  |  | 1,451,392 |
Less: accumulated depreciation | 717,561 |  |  | 669,984 |  |  | 627,829 |
Property, plant and equipment, net | $ | 763,443 |  |  | $ | 786,029 |  |  | $ | 823,563 |
Depreciation expense on property, plant and equipment used in continuing operations was $55.8 million and $62.5 million for the six months ended June 30, 2022 and 2021, respectively. Additionally, depreciation expense on property, plant and equipment used in continuing operations was $27.5 million and $31.4 million for the three months ended June 30, 2022 and 2021, respectively. During the second quarter of 2022, the Company closed on the sale of the remaining assets of the Company's Frac Sand business for total consideration of $8.4 million resulting in a pre-tax gain of $3.7 million.

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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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