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Discontinued Operations (Schedule of Net Sales and Income from Discontinued Operations) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discontinued Operations [Abstract]                      
Net sales                 $ 2us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 73us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 8,705us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Income from discontinued operations before income taxes                 4us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 23us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 3,842us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax (benefit) expense                 2us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 9us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation 2,418us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
(Loss) Income from discontinued operations $ (9)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (3)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 14us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 38us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (24)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 2us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 14us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 1,424us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Effective Income Tax Rate Discontinued Operations                 50.00%fstr_EffectiveIncomeTaxRateDiscontinuedOperations 39.10%fstr_EffectiveIncomeTaxRateDiscontinuedOperations 62.90%fstr_EffectiveIncomeTaxRateDiscontinuedOperations