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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consisted of the following at December 31:
(In thousands) | 2021 |  | 2020
Land | $ | 11,820 |  |  | $ | 11,901 |
Buildings and improvements | 118,395 |  |  | 122,961 |
Machinery and equipment | 282,258 |  |  | 285,678 |
Computer hardware and software | 48,389 |  |  | 46,801 |
Furniture and fixtures | 5,879 |  |  | 5,955 |
Construction in progress | 8,194 |  |  | 6,958 |
| 474,935 |  |  | 480,254 |
Less accumulated depreciation | (287,046) |  |  | (268,862) |
| 187,889 |  |  | 211,392 |
Composite mats (rental fleet) | 135,975 |  |  | 126,617 |
Less accumulated depreciation - composite mats | (63,608) |  |  | (60,313) |
| 72,367 |  |  | 66,304 |
Property, plant and equipment, net | $ | 260,256 |  |  | $ | 277,696 |
Depreciation expense was $38.5 million, $40.9 million, and $42.8 million in 2021, 2020 and 2019, respectively. Fluids Systems segment includes a $3.0 million impairment charge for 2020, attributable to the abandonment of certain property, plant and equipment.

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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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