Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 8,465us-gaap_InventoryRawMaterials	$ 12,852us-gaap_InventoryRawMaterials
Work in progress	6,126us-gaap_InventoryWorkInProcess	1,866us-gaap_InventoryWorkInProcess
Finished goods	4,800us-gaap_InventoryFinishedGoods	5,306us-gaap_InventoryFinishedGoods
Supplies	915us-gaap_OtherInventorySupplies	1,034us-gaap_OtherInventorySupplies
Total Inventories	20,306us-gaap_InventoryGross	21,058us-gaap_InventoryGross
Inventory reserve	(131)us-gaap_InventoryValuationReserves	(305)us-gaap_InventoryValuationReserves
Net Inventories	$ 20,175us-gaap_InventoryNet	$ 20,753us-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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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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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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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