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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, at Cost | Property, plant and equipment, at cost, consist of the following at December 31, 2015 and 2014 (in thousands):
|  | Useful Lives (Years) |  | December 31,
2015 |  | 2014
Land(a) |  | — |  | $ | 145,912 |  |  | $ | 56,249 |
Land improvements |  | 5 – 30 |  | 59,423 |  |  | 49,099 |
Buildings and improvements(a) |  | 10 – 45 |  | 297,163 |  |  | 214,364 |
Machinery and equipment(b) |  | 2 – 45 |  | 2,305,641 |  |  | 2,106,451 |
Long-term mineral rights and production equipment costs |  | 7 – 60 |  | 652,871 |  |  | 85,888 |
Construction in progress |  | — |  | 420,152 |  |  | 108,619 |
Total |  |  |  | $ | 3,881,162 |  |  | $ | 2,620,670 |
(a) | Includes Land under capital lease of $2.8 million and Buildings and improvements under capital lease of $9.9 million at December 31, 2015.
(b) | 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.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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