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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory [Line Items]    
Raw materials $ 18,959us-gaap_InventoryRawMaterials $ 17,121us-gaap_InventoryRawMaterials
Work in process 2,611us-gaap_InventoryWorkInProcess 3,243us-gaap_InventoryWorkInProcess
Finished goods 2,440us-gaap_InventoryFinishedGoods 2,741us-gaap_InventoryFinishedGoods
Stores and spares 2,602us-gaap_OtherInventoriesSpareParts 2,404us-gaap_OtherInventoriesSpareParts
Packing material 181tgls_InventoryPackingMaterialGross 110tgls_InventoryPackingMaterialGross
Inventory Gross 26,793us-gaap_InventoryGross 25,619us-gaap_InventoryGross
Less: inventory allowances (1,474)us-gaap_InventoryValuationReserves (1,438)us-gaap_InventoryValuationReserves
Inventory Net $ 25,319us-gaap_InventoryNet $ 24,181us-gaap_InventoryNet