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

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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 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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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Gross amount of merchandise or supplies to which the entity holds the title but does not hold physical possession because the goods are currently being transported.

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