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Inventories, Net and Significant Suppliers (Tables) | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories, Net | Inventories, net were as follows:
(In thousands) | March 31, 2018 |  | December 31, 2017 |
Raw materials | $ | 46,886 |  |  | $ | 43,638 |
Components | 11,972 |  |  | 16,214 |
Work in process | 252 |  |  | 1,847 |
Finished goods | 84,526 |  |  | 105,178 |
Reserve for excess and obsolete inventory | (4,228 | ) |  | (4,288 | )
Inventories, net | $ | 139,408 |  |  | $ | 162,589 |
Changes in Reserve for Excess and Obsolete Inventory | Changes in the reserve for excess and obsolete inventory were as follows:
(In thousands) | Three Months Ended March 31,
2018 |  | 2017
Balance at beginning of period | $ | 4,288 |  |  | $ | 4,205 |
Additions charged to costs and expenses (1) | 643 |  |  | 632 |
Sell through (2) | (315 | ) |  | (354 | )
(Write-offs)/Foreign exchange effects | (388 | ) |  | (274 | )
Balance at end of period | $ | 4,228 |  |  | $ | 4,209 |
(1) | The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $113 thousand and $27 thousand for the three months ended March 31, 2018 and 2017, respectively. These amounts are production waste and are not included in management's reserve for excess and obsolete inventory.
(2) | These amounts represent the reduction in 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:
| Three Months Ended March 31,
| 2018 |  | 2017
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Texas Instruments (1) | $ | — |  |  | — | % |  | $ | 9,128 |  |  | 10.4 | %
(1) | Purchases associated with this supplier did not total more than 10% of our total inventory purchases for the three months ended March 31, 2018.
Inventory Purchases from Related Party Supplier | Inventory purchases from this supplier were as follows:
| Three Months Ended March 31,
| 2018 |  | 2017
| $ (thousands) |  | % of Total Inventory Purchases |  | $ (thousands) |  | % of Total Inventory Purchases
Related party supplier | $ | 1,117 |  |  | 1.2 | % |  | $ | 946 |  |  | 1.1 | %
Total accounts payable to this supplier were as follows:
| March 31, 2018 |  | December 31, 2017
| $ (thousands) |  | % of Accounts Payable |  | $ (thousands) |  | % of Accounts Payable
Related party supplier | $ | 1,781 |  |  | 1.7 | % |  | $ | 1,500 |  |  | 1.3 | %

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