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Inventories (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Inventories [Abstract] |  |  |
Raw materials | $ 11,535 us-gaap_InventoryRawMaterials | $ 12,328 us-gaap_InventoryRawMaterials |
Work in progress | 1,473 us-gaap_InventoryWorkInProcess | 360 us-gaap_InventoryWorkInProcess |
Finished products | 48,822 us-gaap_InventoryFinishedGoods | 51,551 us-gaap_InventoryFinishedGoods |
Inventories | 61,830 us-gaap_InventoryNet | 64,239 us-gaap_InventoryNet |
Inventories shipped to customers | 18,622 us-gaap_OtherInventoryInTransit | 20,851 us-gaap_OtherInventoryInTransit |
Inventory write-off | 3,515 us-gaap_InventoryWriteDown | 396 us-gaap_InventoryWriteDown | 904 us-gaap_InventoryWriteDown
Inventory write-off provision | $ 5,238 us-gaap_InventoryValuationReserves | $ 3,252 us-gaap_InventoryValuationReserves |

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