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Inventories, Net and Significant Suppliers (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Inventories, Net | Inventories, net were as follows:
| December 31,
(In thousands) | 2019 |  | 2018
Raw materials | $ | 61,220 |  |  | $ | 68,834 |
Components | 25,239 |  |  | 25,071 |
Work in process | 1,526 |  |  | 5,577 |
Finished goods | 68,175 |  |  | 50,006 |
Reserve for excess and obsolete inventory | (11,025 | ) |  | (5,138 | )
Inventories, net | $ | 145,135 |  |  | $ | 144,350 |
Changes in Reserve for Excess and Obsolete Inventory | Changes in the reserve for excess and obsolete inventory were as follows:
| Year Ended December 31,
(In thousands) | 2019 |  | 2018 |  | 2017
Balance at beginning of period | $ | 5,138 |  |  | $ | 4,288 |  |  | $ | 4,205 |
Additions charged to costs and expenses | 12,792 |  |  | 6,702 |  |  | 3,685 |
Sell through (1) | (1,500 | ) |  | (1,825 | ) |  | (1,242 | )
(Write-offs)/Foreign exchange effects | (5,405 | ) |  | (4,027 | ) |  | (2,360 | )
Balance at end of period | $ | 11,025 |  |  | $ | 5,138 |  |  | $ | 4,288 |
(1) | These amounts represent the reversal of reserves associated with inventory items that were sold during the period.
Purchases from Significant Suppliers | Purchases from the following supplier totaled more than 10% of our total inventory purchases:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Texas Instruments | — |  | (1) | — | (1) | — |  | (1) | — | (1) | $ | 42,058 |  |  | 10.0 | %
(1) Purchases associated with this supplier did not total more than 10% of our total inventory purchases for the indicated period.

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