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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Inventory Disclosure [Abstract] |  |  |  |
Raw materials | $ 34,153us-gaap_InventoryRawMaterials | $ 28,592us-gaap_InventoryRawMaterials |  |
Work in process | 2,262us-gaap_InventoryWorkInProcess | 2,286us-gaap_InventoryWorkInProcess |  |
Finished goods | 1,917us-gaap_InventoryFinishedGoods | 1,841us-gaap_InventoryFinishedGoods |  |
Inventory, gross | 38,332us-gaap_InventoryGross | 32,719us-gaap_InventoryGross |  |
Less: Allowance for excess and obsolete inventories | (714)us-gaap_InventoryValuationReserves | (579)us-gaap_InventoryValuationReserves | (363)us-gaap_InventoryValuationReserves | (300)us-gaap_InventoryValuationReserves
Total, net | $ 37,618us-gaap_InventoryNet | $ 32,140us-gaap_InventoryNet |  |

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