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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant, and Equipment Property, plant, and equipment as of September 30, 2021 and December 31, 2020 consisted of the following:
|  | September 30, 2021 |  | December 31, 2020
Land |  | $ | 6,223 |  |  | $ | 6,627 |
Improvements to land and leaseholds |  | 15,401 |  |  | 17,573 |
Buildings |  | 26,966 |  |  | 27,348 |
Machinery and equipment, including equipment under finance leases |  | 110,821 |  |  | 116,175 |
Construction in progress |  | 1,276 |  |  | 915 |
Gross property, plant, and equipment |  | 160,687 |  |  | 168,638 |
Less accumulated depreciation and amortization, including accumulated amortization of finance leases |  | (101,876) |  |  | (106,553) |
Property, plant, and equipment - net |  | $ | 58,811 |  |  | $ | 62,085 |
Depreciation expense was $2,041 and $1,940 for the three months ended September 30, 2021 and 2020, respectively, and $6,049 and $5,838 for the nine months ended September 30, 2021 and 2020, respectively. The Company reviews its property, plant, and equipment for recoverability whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. The Company recognizes an impairment loss if it believes that the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. There were no impairments of property, plant, and equipment during the nine months ended September 30, 2021 and 2020. On September 24, 2021, the Company executed the sale of its Piling Products division for $23,902 in total expected proceeds. The Company retained all pre-closing receivables and liabilities associated with the division. The sale included substantially all fixed assets held by the Company associated with the division. The Piling Products division is included in the Fabricated Steel business unit within the Infrastructure Solutions business segment.

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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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