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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 7,271us-gaap_InventoryRawMaterials	$ 7,145us-gaap_InventoryRawMaterials
Work in process	1,199us-gaap_InventoryWorkInProcess	1,142us-gaap_InventoryWorkInProcess
Finished goods	4,455us-gaap_InventoryFinishedGoods	4,606us-gaap_InventoryFinishedGoods
Total inventory	$ 12,925us-gaap_InventoryNet	$ 12,893us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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