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Property, Plant, and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment Property, plant, and equipment on the Consolidated Balance Sheets is summarized as follows:
|  | December 31,
(Thousands) |  | 2022 |  | 2021
Land |  | $ | 26,579 |  |  | $ | 26,627 |
Buildings |  | 200,223 |  |  | 173,907 |
Machinery and equipment |  | 770,628 |  |  | 687,502 |
Software |  | 44,886 |  |  | 45,445 |
Construction in progress |  | 100,188 |  |  | 130,838 |
Allowances for depreciation |  | (720,455) |  |  | (690,166) |
Subtotal |  | 422,049 |  |  | 374,153 |
Finance leases |  | 31,662 |  |  | 32,865 |
Allowances for depreciation |  | (7,395) |  |  | (6,193) |
Subtotal |  | 24,267 |  |  | 26,672 |
Mineral resources |  | 4,980 |  |  | 4,980 |
Mine development |  | 30,059 |  |  | 30,059 |
Allowances for amortization and depletion |  | (32,590) |  |  | (26,889) |
Subtotal |  | 2,449 |  |  | 8,150 |
Property, plant, and equipment — net |  | $ | 448,765 |  |  | $ | 408,975 |
The Company received $63.5 million from the U.S. Department of Defense (DoD), in previous periods, for reimbursement of the DoD's share of the cost of equipment. This amount was recorded in property, plant, and equipment and the reimbursements are reflected in Unearned income on the Consolidated Balance Sheets. The equipment was placed in service during 2012, and its full cost is being depreciated in accordance with Company policy. The unearned income liability is being reduced ratably with the depreciation expense recorded over the life of the equipment. Unearned income was reduced by $4.4 million in 2022 and $4.3 million in both 2021 and 2020 and credited to cost of sales in the Consolidated Statements of Income, offsetting the impact of the depreciation expense on the associated equipment on the Company's cost of sales and gross margin. The unamortized unearned income balance was $15.3 million and $19.7 million at December 31, 2022 and December 31, 2021, respectively. We recorded depreciation and depletion expense of $35.2 million in 2022, $31.4 million in 2021, and $30.9 million in 2020. Depreciation, depletion, and amortization as shown on the Consolidated Statement of Cash Flows is net of the reduction in the unearned income liability in 2022, 2021, and 2020. The net c arrying value of capitalize d software was $4.6 million and $5.4 million at December 31, 2022 and December 31, 2021, respectively. Depreciation expense related to software was $1.8 million in 2022, 2021, and 2020, respectively. As of December 31, 2022 and December 31, 2021 capital expenditures in accounts payable was $12.1 million and $2.1 million, 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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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