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Basis of Presentation, Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of inventory | Our “Inventories” line item in the consolidated statements of financial position consisted of the following:
| As of December 31,
(Dollars in thousands) | 2020 |  | 2019
Raw materials | $ | 44,976 |  |  | $ | 61,338 |
Work-in-process | 25,291 |  |  | 30,043 |
Finished goods | 32,093 |  |  | 41,478 |
Total inventories | $ | 102,360 |  |  | $ | 132,859 |
Schedule of property, plant and equipment, estimated useful lives | 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
Our “Property, plant and equipment, net” line item in the consolidated statements of financial position consisted of the following:
| As of December 31,
(Dollars in thousands) | 2020 |  | 2019
Land and improvements | $ | 22,589 |  |  | $ | 21,697 |
Buildings and improvements | 155,669 |  |  | 165,968 |
Machinery and equipment | 324,773 |  |  | 281,771 |
Office equipment | 59,001 |  |  | 68,349 |
Property plant and equipment, gross | 562,032 |  |  | 537,785 |
Accumulated depreciation | (365,844) |  |  | (341,119) |
Property, plant and equipment, net | 196,188 |  |  | 196,666 |
Equipment in process | 76,190 |  |  | 63,580 |
Total property, plant and equipment, net | $ | 272,378 |  |  | $ | 260,246 |

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