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Stockholders' Equity (Rollforward Of Common Stock Table) (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |
Balance (Outstanding Shares), Ending | 10,242,405 us-gaap_CommonStockSharesOutstanding | 10,188,521 us-gaap_CommonStockSharesOutstanding |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Balance (Treasury Shares), Beginning | 927,258 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 966,381 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 1,042,376 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Balance (Outstanding Shares), Beginning | 10,188,521 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 10,149,398 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 10,073,403 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Issued for stock-based compensation plans (Treasury) | (53,884)us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (39,123)us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (75,995)us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Issued for stock-based compensation plans (Outstanding) | 53,884 fstr_StockIssuedDuringPeriodSharesTreasuryStockReissuedCommonSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 39,123 fstr_StockIssuedDuringPeriodSharesTreasuryStockReissuedCommonSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 75,995 fstr_StockIssuedDuringPeriodSharesTreasuryStockReissuedCommonSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Balance (Treasury Shares), Ending | 873,374 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 927,258 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 966,381 us-gaap_TreasuryStockNumberOfSharesHeld / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Balance (Outstanding Shares), Ending | 10,242,405 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 10,188,521 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 10,149,398 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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