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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 13, 2015
Cash, Cash Equivalents, and Short-term Investments |  | $ 18,276 us-gaap_CashCashEquivalentsAndShortTermInvestments |  |
Percentage of Weighted Average Cost Inventory | 44.00%us-gaap_PercentageOfWeightedAverageCostInventory | 38.00%us-gaap_PercentageOfWeightedAverageCostInventory |  |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |
Asset Retirement Obligation | 832 us-gaap_AssetRetirementObligation | 667 us-gaap_AssetRetirementObligation |  |
Product Warranty Accrual | 11,500 us-gaap_ProductWarrantyAccrual | 7,483 us-gaap_ProductWarrantyAccrual |  |
Foreign Currency Transaction Gain (Loss), Realized | 422 us-gaap_ForeignCurrencyTransactionGainLossRealized | 433 us-gaap_ForeignCurrencyTransactionGainLossRealized | (238)us-gaap_ForeignCurrencyTransactionGainLossRealized |
Research and Development Expense | 3,096 us-gaap_ResearchAndDevelopmentExpense | 3,154 us-gaap_ResearchAndDevelopmentExpense | 2,926 us-gaap_ResearchAndDevelopmentExpense |
Payments to Acquire Businesses, Net of Cash Acquired | 80,797 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 37,500 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
Non-Domestic [Member] |  |  |  |
Certificates of Deposit, at Carrying Value | 25 us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_StatementGeographicalAxis = fstr_NonDomesticMember | 32,947 us-gaap_CertificatesOfDepositAtCarryingValue / us-gaap_StatementGeographicalAxis = fstr_NonDomesticMember |  |
Cash, Cash Equivalents, and Short-term Investments | 49,233 us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_StatementGeographicalAxis = fstr_NonDomesticMember | 43,560 us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_StatementGeographicalAxis = fstr_NonDomesticMember |  |
Subsequent Event [Member] | Tew Holdings (2012), LTD [Member] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 26,600 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldings2012LtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Maximum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |  |  |
Maximum [Member] | Building [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 14 years |  |  |
Minimum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |
Minimum [Member] | Building [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 25 years |  |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |
Weighted Average [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 16 years |  |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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