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Inventory (Schedule of Inventory) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Inventories [Abstract] |  |  |
Finished goods | $ 65,335 us-gaap_InventoryFinishedGoods | $ 55,166 us-gaap_InventoryFinishedGoods |
Work-in-process | 16,188 us-gaap_InventoryWorkInProcess | 11,332 us-gaap_InventoryWorkInProcess |
Raw materials | 21,855 us-gaap_InventoryRawMaterials | 19,485 us-gaap_InventoryRawMaterials |
Total inventories at current costs | 103,378 us-gaap_InventoryGross | 85,983 us-gaap_InventoryGross |
Less: LIFO reserve | (8,289)us-gaap_InventoryLIFOReserve | (9,027)us-gaap_InventoryLIFOReserve |
Inventory | 95,089 us-gaap_InventoryNet | 76,956 us-gaap_InventoryNet |
Excess of Book LIFO Over Tax LIFO | 11,697 fstr_ExcessOfBookLifoOverTaxLifoValue | 12,241 fstr_ExcessOfBookLifoOverTaxLifoValue |
Effect Of Inventory Liquidation On Cost Of Good Sold, Increase/(Decrease) | $ 6 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome | $ 1,128 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome | $ 15 us-gaap_EffectOfLIFOInventoryLiquidationOnIncome

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