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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 | Property, Plant and Equipment: Property, plant and equipment, at cost, consist of the following at December 31, 2020 and 2019 (in thousands):
|  | Useful Lives (Years) |  | December 31,
2020 |  | 2019
Land |  | — |  | $ | 121,330 |  |  | $ | 116,728 |
Land improvements |  | 10 – 30 |  | 115,693 |  |  | 83,256 |
Buildings and improvements |  | 10 – 50 |  | 354,679 |  |  | 337,728 |
Machinery and equipment(a) |  | 2 – 45 |  | 3,564,389 |  |  | 3,355,519 |
Mineral rights and reserves |  | 7 – 60 |  | 1,780,236 |  |  | 1,764,067 |
Construction in progress |  | — |  | 1,491,314 |  |  | 1,160,545 |
Total |  |  |  | $ | 7,427,641 |  |  | $ | 6,817,843 |
(a)Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 2 – 7 years, (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years, (3) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (4) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years. The cost of property, plant and equipment is depreciated generally by the straight-line method. Depletion of mineral rights is based on the units-of-production method. Depreciation expense, including depletion, amounted to $203.6 million, $183.3 million and $170.0 million during the years ended December 31, 2020, 2019 and 2018, respectively. Interest capitalized on significant capital projects in 2020, 2019 and 2018 was $30.4 million, $30.2 million and $19.3 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 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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