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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 6. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost and are depreciated and amortized over a period of three to 39 years generally under the straight-line method for financial reporting purposes and accelerated methods for income tax purposes. Property, plant and equipment as of December 31 were as follows (in thousands):
|  | 2020 |  |  | 2019 |
Land |  | $ | 3,600 |  |  | $ | 3,600 |
Buildings and improvements |  |  | 45,905 |  |  |  | 45,791 |
Machinery and equipment |  |  | 233,635 |  |  |  | 220,405 |
Furniture and fixtures |  |  | 8,429 |  |  |  | 8,231 |
Construction in-progress and deposits |  |  | 17,987 |  |  |  | 4,362 |
|  |  | 309,556 |  |  |  | 282,389 |
Accumulated depreciation and amortization |  |  | (239,162 | ) |  |  | (229,698 | )
Right of use asset — net |  |  | 4,449 |  |  |  | 4,261 |
Net balance |  | $ | 74,843 |  |  | $ | 56,952 |
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was approximately $10,950,000, $10,226,000, and $9,135,000 , respectively. As of December 31, 2020, the Company had approximately $13,141,000 of capital expenditure commitments.

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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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