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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 December 31, consist of the following:
| 2017 |  | 2016
Land and improvements | $ | 41,823 |  |  | $ | 42,654 |
Buildings and improvements | 331,735 |  |  | 330,254 |
Machinery and equipment | 1,398,687 |  |  | 1,374,551 |
Construction in progress | 22,517 |  |  | 21,106 |
| 1,794,762 |  |  | 1,768,565 |
Less accumulated depreciation | (822,846 | ) |  | (742,280 | )
Property, plant and equipment - net | $ | 971,916 |  |  | $ | 1,026,285 |
For the years ended December 31, 2017, 2016 and 2015, we recorded depreciation and amortization expense of $84,249, $84,780 and $80,117, respectively. See Note 3. Helguvik and Ravenswood gains and losses regarding impairment of our Helguvik project.

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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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