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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | PROPERTY, P LANT AND E QUIPMENT, N ET Property, plant and equipment, net at December 31 was as follows:
| 2019 |  | 2018
| (Dollars in thousands)
Land | $ | 77,233 |  |  | $ | 73,084 |
Buildings and improvements | 493,035 |  |  | 467,067 |
Machinery and equipment | 3,009,591 |  |  | 2,912,841 |
Construction in progress | 167,635 |  |  | 159,758 |
| 3,747,494 |  |  | 3,612,750 |
Accumulated depreciation | (2,177,163 | ) |  | (2,095,240 | )
| $ | 1,570,331 |  |  | $ | 1,517,510 |
Depreciation expense in 2019, 2018 and 2017 was $179.3 million, $164.1 million and $150.5 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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