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Inventories, Net and Significant Suppliers - Inventory Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Reserve for Excess and Obsolete Inventory |  |  |  |
Balance at beginning of period |  | $ 2,539 | $ 2,714 | $ 2,024
Additions charged to costs and expenses | [1] | 3,070 | 3,181 | 3,387
Sell through | [2] | (1,108) | (869) | (365)
Write-offs/FX effects |  | (1,456) | (2,487) | (2,332)
Balance at end of period |  | 3,045 | 2,539 | 2,714
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, 2015, 2014, and 2013, 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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