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Inventories | 12 Months Ended
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Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventories | Inventories The Company’s significant components of inventory at December 31, 2021 and 2020 were as follows (in thousands):
| December 31, 2021 |  | December 31, 2020
Raw materials and parts | $ | 97,053 |  |  | $ | 151,531 |
Work in process | 24,618 |  |  | 15,946 |
Finished goods | 182,954 |  |  | 229,212 |
Gross inventories | 304,625 |  |  | 396,689 |
Inventory reserve | (62,885) |  |  | (144,942) |
Inventories | $ | 241,740 |  |  | $ | 251,747 |
The change in the amounts of the inventory reserve during the two year period ended December 31, 2021 is as follows (in thousands):
Period ended | Balance at beginning of period |  | Charged to expense |  | Deductions or other |  | Balance at end of period
December 31, 2020 | 66,075 |  |  | 100,794 |  |  | (21,927) |  |  | $ | 144,942 |
December 31, 2021 | 144,942 |  |  | 8,096 |  |  | (90,153) |  |  | $ | 62,885 |
The $100.8 million charged to expense during the year ended December 31, 2020 includes significant write downs of inventory related to the Company’s decision to discontinue certain products and other changes to sourcing and manufacturing strategies.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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