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Inventories, Net and Significant Suppliers - Inventory Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Reserve for Excess and Obsolete Inventory |  |  |  |
Balance at beginning of period |  | $ 3,045 | $ 2,539 | $ 2,714
Additions charged to costs and expenses | [1] | 3,464 | 3,070 | 3,181
Sell through | [2] | (1,116) | (1,108) | (869)
Write-offs/Foreign exchange effects |  | (1,188) | (1,456) | (2,487)
Balance at end of period |  | 4,205 | 3,045 | 2,539
Inventory scrapped during production |  | $ 300 | $ 300 | $ 300
[1] | The additions charged to costs and expenses do not include inventory directly written-off that was scrapped during production totaling $0.3 million, $0.3 million, and $0.3 million for the years ended December 31, 2016, 2015, and 2014, respectively. These amounts are production waste and are not included in management’s reserve for excess and obsolete inventory.
[2] | These amounts represent the reversal of reserves associated with inventory items that were sold during the period.

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