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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 12. Property, Plant and Equipment: A summary of property, plant and equipment, at cost, and related accumulated depreciation is as follows:
|  | June 30, 2021 |  | December 31, 2020
Land |  | $ | 97,712 |  |  | $ | 93,650 |
Buildings |  | 77,695 |  |  | 76,010 |
Machinery and equipment |  | 688,774 |  |  | 656,502 |
Construction in progress |  | 39,568 |  |  | 42,446 |
|  | 903,749 |  |  | 868,608 |
Less: accumulated depreciation |  | (308,726) |  |  | (276,898) |
|  | $ | 595,023 |  |  | $ | 591,710 |
Depreciation expense was $17,529 and $16,340 for the three months ended June 30, 2021 and 2020, respectively. Depreciation expense was $33,533 and $31,635 for the six months ended June 30, 2021 and 2020, 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 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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