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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
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, 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.
The cost of property, plant and equipment is depreciated generally by the straight-line method. Depletion of long-term mineral rights is based on the units-of-production method. Depreciation expense amounted to $169.5 million, $178.8 million and $162.2 million during the years ended December 31, 2017, 2016 and 2015, respectively. Depreciation expense related to discontinued operations was $8.9 million and $18.5 million during the years ended December 31, 2016 and 2015, respectively. Interest capitalized on significant capital projects in 2017, 2016 and 2015 was $7.4 million, $6.8 million and $11.2 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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