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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, at Cost | Property, plant and equipment, at cost, consist of the following at December 31, 2017 and 2016 (in thousands):
|  | Useful Lives (Years) |  | December 31,
2017 |  | 2016
Land |  | — |  | $ | 118,428 |  |  | $ | 120,842 |
Land improvements |  | 10 – 30 |  | 63,328 |  |  | 59,387 |
Buildings and improvements |  | 10 – 45 |  | 245,482 |  |  | 256,603 |
Machinery and equipment(a) |  | 2 – 45 |  | 2,627,667 |  |  | 2,501,481 |
Long-term mineral rights and production equipment costs |  | 7 – 60 |  | 675,832 |  |  | 654,006 |
Construction in progress |  | — |  | 393,598 |  |  | 318,203 |
Total(b) |  |  |  | $ | 4,124,335 |  |  | $ | 3,910,522 |
(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.
(b) | As of December 31, 2017, $215.9 million of Property, plant and equipment, at cost, was classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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