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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Schedule of property, plant and equipment | For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:
Property, Plant and Equipment Classification | Estimated Useful Lives
Buildings and improvements | 30-40 years
Machinery and equipment | 5-15 years
Office equipment | 3-10 years
| As of December 31,
(Dollars in thousands) | 2018 |  | 2017
Land | $ | 21,525 |  |  | $ | 14,620 |
Buildings and improvements | 175,279 |  |  | 135,191 |
Machinery and equipment | 256,301 |  |  | 238,000 |
Office equipment | 64,886 |  |  | 56,554 |
Property plant and equipment, gross | 517,991 |  |  | 444,365 |
Accumulated depreciation | (317,414 | ) |  | (289,909 | )
Property, plant and equipment, net | 200,577 |  |  | 154,456 |
Equipment in process | 42,182 |  |  | 25,155 |
Total property, plant and equipment, net | $ | 242,759 |  |  | $ | 179,611 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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