$FSTR
FOSTER L B CO Stock $fstr

$fstr Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000035282520000057 Filed on November 05, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$115.6M	$118.4M	$141.6M
YoY Change	-18.22%	-18.28%	-25.77%
Cost Of Revenue	$93.90M	$96.30M	$113.4M
YoY Change	-16.98%	-17.62%	-30.76%
Gross Profit	$21.69M	$22.06M	$28.14M
YoY Change	-23.1%	-21.07%	-23.18%
Gross Profit Margin	18.76%	18.64%	19.88%
Selling, General & Admin	$17.40M	$17.07M	$18.87M
YoY Change	-11.68%	-18.87%	-17.44%
% of Gross Profit	80.24%	77.36%	67.06%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.470M	$1.940M	$1.963M
YoY Change	0.58%	-3.24%	-29.08%
% of Gross Profit	16.0%	8.79%	6.98%
Operating Expenses	$18.60M	$17.07M	$18.87M
YoY Change	-25.0%	-18.87%	-17.44%
Operating Profit	$3.085M	$6.117M	$3.217M
YoY Change	-9.21%	-31.81%	-80.33%
Interest Expense	$470.0K	$940.0K	$1.089M
YoY Change	-152.22%	-185.45%	-168.06%
% of Operating Profit	15.24%	15.37%	33.85%
Other Income/Expense, Net		$209.0K	$2.306M
YoY Change		-44.12%	815.08%
Pretax Income	$2.100M	$2.836M	$9.072M
YoY Change	-16.0%	-38.21%	-19.35%
Income Tax	-$100.0K	-$13.74M	$2.102M
% Of Pretax Income	-4.76%	-484.56%	23.17%
Net Earnings	$2.095M	$6.830M	$523.0K
YoY Change	-92.02%	122.91%	-94.53%
Net Earnings / Revenue	1.81%	5.77%	0.37%
Basic Earnings Per Share	$0.20	$0.65	$0.05
Diluted Earnings Per Share	$0.20	$0.64	$0.05
COMMON SHARES
Basic Shares Outstanding	10.75M shares	10.56M shares	10.56M shares
Diluted Shares Outstanding		10.66M shares	10.62M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$7.600M	$9.300M	$7.400M
YoY Change	-46.48%	-39.61%	-38.33%
Cash & Equivalents	$7.564M	$9.311M	$7.387M
Short-Term Investments
Other Short-Term Assets	$13.00M	$15.18M	$7.168M
YoY Change	216.92%	139.9%	2.55%
Inventory	$78.62M	$117.3M	$113.7M
Prepaid Expenses
Receivables	$58.21M	$98.30M	$116.1M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$195.3M	$203.2M	$210.8M
YoY Change	-9.85%	-13.73%	-16.38%
LONG-TERM ASSETS
Property, Plant & Equipment	$78.20M	$79.40M	$97.30M
YoY Change	-5.0%	-4.1%	15.23%
Goodwill	$20.34M	$19.82M	$18.97M
YoY Change	3.96%	4.72%	-1.27%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$1.204M	$1.172M	$1.250M
YoY Change	7.6%	-9.5%	-7.75%
Total Long-Term Assets	$175.1M	$175.8M	$186.5M
YoY Change	-7.12%	9.31%	13.27%
TOTAL ASSETS
Total Short-Term Assets	$195.3M	$203.2M	$210.8M
Total Long-Term Assets	$175.1M	$175.8M	$186.5M
Total Assets	$370.4M	$378.9M	$397.4M
YoY Change	-8.58%	-4.38%	-4.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$54.79M	$60.18M	$71.48M
YoY Change	-13.08%	-17.84%	-8.99%
Accrued Expenses	$15.74M	$13.32M	$15.19M
YoY Change	1.16%	-5.87%	15.75%
Deferred Revenue	$7.144M	$7.835M	$8.517M
YoY Change	-15.42%	-10.05%	-0.3%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$100.0K	$100.0K	$100.0K
YoY Change	-96.55%	-96.67%	-96.77%
Total Short-Term Liabilities	$95.30M	$99.24M	$113.1M
YoY Change	-18.37%	-17.79%	-8.45%
LONG-TERM LIABILITIES
Long-Term Debt	$44.90M	$49.00M	$55.40M
YoY Change	-18.81%	-30.0%	-37.05%
Other Long-Term Liabilities	$11.76M	$10.64M	$15.69M
YoY Change	-1.33%	-33.92%	-3.55%
Total Long-Term Liabilities	$11.76M	$10.64M	$15.69M
YoY Change	-1.33%	-33.92%	-3.55%
TOTAL LIABILITIES
Total Short-Term Liabilities	$95.30M	$99.24M	$113.1M
Total Long-Term Liabilities	$11.76M	$10.64M	$15.69M
Total Liabilities	$107.1M	$109.9M	$128.8M
YoY Change	-16.79%	-19.69%	-7.88%
SHAREHOLDERS EQUITY
Retained Earnings	$165.1M	$163.0M	$156.2M
YoY Change	4.81%	24.18%	21.82%
Common Stock	$111.0K	$111.0K	$111.0K
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$12.70M	$12.72M	$12.72M
YoY Change	-24.36%	-24.4%	-24.46%
Treasury Stock Shares	552.5K shares	553.4K shares	553.4K shares
Shareholders Equity	$176.8M	$173.4M	$163.9M
YoY Change
Total Liabilities & Shareholders Equity	$370.4M	$378.9M	$397.4M
YoY Change	-8.58%	-4.38%	-4.67%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$2.095M	$6.830M	$523.0K
YoY Change	-92.02%	122.91%	-94.53%
Depreciation, Depletion And Amortization	$3.470M	$1.940M	$1.963M
YoY Change	0.58%	-3.24%	-29.08%
Cash From Operating Activities	$3.640M	$9.390M	$14.69M
YoY Change	-76.87%	-53.9%	256.55%
INVESTING ACTIVITIES
Capital Expenditures	-$1.530M	-$220.0K	-$4.620M
YoY Change	-56.53%	-116.42%	260.94%
Acquisitions
YoY Change
Other Investing Activities	-$100.0K	-$1.050M	$10.00K
YoY Change	-111.11%	2000.0%	-50.0%
Cash From Investing Activities	-$1.630M	-$1.270M	-$4.610M
YoY Change	-37.79%	-198.45%	265.87%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-4.130M	-6.460M	-9.050M
YoY Change	-72.15%	-64.29%	-22725.0%
NET CHANGE
Cash From Operating Activities	3.640M	9.390M	14.69M
Cash From Investing Activities	-1.630M	-1.270M	-4.610M
Cash From Financing Activities	-4.130M	-6.460M	-9.050M
Net Change In Cash	-2.120M	1.660M	1.030M
YoY Change	23.98%	-53.5%	-64.48%
FREE CASH FLOW
Cash From Operating Activities	$3.640M	$9.390M	$14.69M
Capital Expenditures	-$1.530M	-$220.0K	-$4.620M
Free Cash Flow	$5.170M	$9.610M	$19.31M
YoY Change	-73.16%	-49.5%	257.59%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Registrant Name EntityRegistrantName	FOSTER L B CO
	dei	Entity Central Index Key EntityCentralIndexKey	0000352825
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201802Member
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CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2020Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:LongTermDebtAndCapitalLeaseObligations
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-10436
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	PA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	25-1324733
	dei	Entity Address Address Line1 EntityAddressAddressLine1	415 Holiday Drive
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
	dei	Entity Address City Or Town EntityAddressCityOrTown	Pittsburgh
	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	15220
	dei	City Area Code CityAreaCode	412
	dei	Local Phone Number LocalPhoneNumber	928-3400
	dei	Security12b Title Security12bTitle	Common stock, par value $0.01
	dei	Trading Symbol TradingSymbol	FSTR
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-5509000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-1509000	USD
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-9748000	USD
CY2019Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-690000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-18056000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-1455000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	6830000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	3064000	USD
	us-gaap	Net Income Loss NetIncomeLoss	5487000	USD
	us-gaap	Net Income Loss NetIncomeLoss	16318000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.57
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.36
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.24
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.71
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-0.92
CY2019Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-0.07
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-1.72
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-0.14
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.57
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.35
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.21
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-0.92
CY2019Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-0.06
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-1.69
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-0.14
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.53
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	6830000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	3064000	USD
	us-gaap	Net Income Loss NetIncomeLoss	5487000	USD
	us-gaap	Net Income Loss NetIncomeLoss	16318000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1818000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1416000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1708000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1038000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-277000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-151000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-809000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1309000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	98000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	98000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-137000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-137000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	15000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	46000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	66000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	90000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	200000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	275000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2021000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1477000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2180000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2072000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8851000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1587000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3307000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14246000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	23543000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	17773000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-8653000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	968000	USD
	us-gaap	Depreciation Depreciation	5838000	USD
	us-gaap	Depreciation Depreciation	5985000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	4271000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	4947000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	29000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-8000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1842000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2910000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-12099000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	2978000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-529000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5001000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1527000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-369000	USD
	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	9241000	USD
	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	4038000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	3393000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	425000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-3739000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-4011000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-575000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	2143000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-4012000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-26000	USD
	fstr	Increase Decrease In Accrued Settlement IncreaseDecreaseInAccruedSettlement	-4000000	USD
	fstr	Increase Decrease In Accrued Settlement IncreaseDecreaseInAccruedSettlement	-6000000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-106000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-1271000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	3325000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-1013000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	16201000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	10311000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-2921000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	2972000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	32000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7650000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2510000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1050000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-8688000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-2478000	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	2278000	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-2306000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	134155000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	156909000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	125122000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	154961000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	454000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	836000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1660000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	600000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-11147000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-3384000	USD
	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-19000	USD
	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-35000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-571000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	12000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4867000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5092000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14178000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10282000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	9311000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15374000	USD
	us-gaap	Interest Paid Net InterestPaidNet	2453000	USD
	us-gaap	Interest Paid Net InterestPaidNet	3599000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	2330000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	6176000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	163896000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	6830000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-66000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1818000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-137000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	604000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	173351000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	136221000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	3064000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-151000	USD
CY2019Q3	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	543	shares
CY2019Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-9000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-90000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1416000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	876000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	138675000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	169862000	USD
	us-gaap	Net Income Loss NetIncomeLoss	5487000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-200000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1708000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-809000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-137000	USD
	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	140305	shares
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-1660000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1842000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	173351000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	122119000	USD
	us-gaap	Net Income Loss NetIncomeLoss	16318000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-275000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1038000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1309000	USD
	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	54628	shares
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-600000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2910000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	138675000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	118365000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	6117000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	144848000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	8970000	USD
CY2020Q3	us-gaap	Assets Assets	378930000	USD
CY2019Q4	us-gaap	Assets Assets	405171000	USD
	fstr	Revenue From Contract With Customer Percentage RevenueFromContractWithCustomerPercentage	0.279
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4472000	USD
	fstr	Revenue From Contract With Customer Percentage RevenueFromContractWithCustomerPercentage	0.299
CY2020Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	36891000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	37032000	USD
CY2020Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	3606000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	118365000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	144848000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	381835000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	475097000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	118365000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	144848000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	381835000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	475097000	USD
	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	23907000	USD
	fstr	Contractwith Customer Liability Increasefrom Cash Receipts ContractwithCustomerLiabilityIncreasefromCashReceipts	3286000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	175000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	194000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	3708000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	1460000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	235190000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.206
CY2019Q4	us-gaap	Goodwill Goodwill	19565000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	466000	USD
	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-208000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	19823000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	79569000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	41523000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	38046000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	80769000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	38656000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42113000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1428000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1622000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4271000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4947000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1452000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5780000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5694000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5223000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4210000	USD
CY2020Q3	fstr	Finite Lived Intangible Asset Expected Amortization Due After Year Four FiniteLivedIntangibleAssetExpectedAmortizationDueAfterYearFour	15687000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	38046000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1176000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1073000	USD
CY2020Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-63000	USD
CY2019Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-119000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	221000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-34000	USD
CY2020Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	63462000	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	59024000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	36891000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	37032000	USD
CY2020Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	4612000	USD
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	3728000	USD
CY2020Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	12302000	USD
CY2019Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	18677000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	117267000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	118461000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	166710000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	159304000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	103989000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	98869000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	62721000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	60435000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	1940000	USD
CY2019Q3	us-gaap	Depreciation Depreciation	2005000	USD
	us-gaap	Depreciation Depreciation	5838000	USD
	us-gaap	Depreciation Depreciation	5985000	USD
	fstr	Lessee Lease Renewal Term LesseeLeaseRenewalTerm	P12Y
	fstr	Lessee Lease Termination Period LesseeLeaseTerminationPeriod	P1Y
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	16696000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	11280000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2615000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2268000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	14081000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9012000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	16696000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	11280000	USD
CY2020Q3	fstr	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	1086000	USD
CY2019Q4	fstr	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	3426000	USD
CY2020Q3	fstr	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	834000	USD
CY2019Q4	fstr	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	2892000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	252000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	534000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	117000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	377000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	135000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	157000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	252000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	534000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	29000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	174000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	381000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	516000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	17000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	15000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	53000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	36000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	719000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	754000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2265000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2281000	USD
CY2020Q3	us-gaap	Sublease Income SubleaseIncome	50000	USD
CY2019Q3	us-gaap	Sublease Income SubleaseIncome	0	USD
	us-gaap	Sublease Income SubleaseIncome	117000	USD
	us-gaap	Sublease Income SubleaseIncome	18000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	715000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	943000	USD
	us-gaap	Lease Cost LeaseCost	2582000	USD
	us-gaap	Lease Cost LeaseCost	2815000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2778000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2680000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	408000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	516000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7681000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1410000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.051
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.051
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.042
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.043
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	891000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	47000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3276000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	158000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2840000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	82000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2620000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	20000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2576000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	11000	USD
CY2020Q3	fstr	Lessee Operating Lease Liability Payments Due After Year Four LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	7776000	USD
CY2020Q3	fstr	Finance Lease Liability To Be Paid Due After Year Four FinanceLeaseLiabilityToBePaidDueAfterYearFour	0	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	19979000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	318000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3283000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	66000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	16696000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	252000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	252000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	534000	USD
CY2020Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	49104000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	58152000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	117000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2877000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	48987000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	55275000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	17000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	17000	USD
CY2020Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	17000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	17000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	1332000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	480000	USD
CY2020Q3	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	1332000	USD
CY2019Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	480000	USD
CY2020Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	234000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	16578000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	3064000	USD
	us-gaap	Net Income Loss NetIncomeLoss	5487000	USD
	us-gaap	Net Income Loss NetIncomeLoss	16318000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3754000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	23543000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	17773000	USD
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-9748000	USD
CY2019Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-690000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-18056000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-1455000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	6830000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10562000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10420000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10533000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10406000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10562000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10420000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10533000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10406000	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	97000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	254000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	121000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	225000	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	97000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	254000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	121000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	225000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10659000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10674000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10654000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10631000	shares
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.57
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.36
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.24
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.71
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.92
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.07
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-1.72
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.14
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.57
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.56
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.35
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.21
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.67
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.92
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.06
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-1.69
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.14
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.53
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	604000	USD
CY2019Q3	us-gaap	Share Based Compensation ShareBasedCompensation	876000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1842000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	2910000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4096000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y6M
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	18.50
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	16.72
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	15.59
	fstr	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustment For Incentive Awards Expected To Vest Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentForIncentiveAwardsExpectedToVestWeightedAverageGrantDateFairValue	28.76
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	20.07
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	19.03
	fstr	Defined Contribution Plan Number DefinedContributionPlanNumber	6	plan
CY2020Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	482000	USD
CY2019Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	734000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	972000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2174000	USD
CY2019Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	1222000	USD
	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	571000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	607000	USD
CY2020Q3	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	1186000	USD
	fstr	Litigation Settlement Amount Awarded To Other Party Scheduled Payment Remainder Of Year LitigationSettlementAmountAwardedToOtherPartyScheduledPaymentRemainderOfYear	4000000	USD
	fstr	Litigation Settlement Amount Awarded To Other Party Scheduled Payment Year One LitigationSettlementAmountAwardedToOtherPartyScheduledPaymentYearOne	8000000	USD
	fstr	Litigation Settlement Amount Awarded To Other Party Scheduled Payment Year Two LitigationSettlementAmountAwardedToOtherPartyScheduledPaymentYearTwo	8000000	USD
	fstr	Litigation Settlement Amount Awarded To Other Party Scheduled Payment Year Three LitigationSettlementAmountAwardedToOtherPartyScheduledPaymentYearThree	8000000	USD
	fstr	Litigation Settlement Amount Awarded To Other Party Scheduled Payment Due After Year Four LitigationSettlementAmountAwardedToOtherPartyScheduledPaymentDueAfterYearFour	8000000	USD
	us-gaap	Litigation Settlement Amount Awarded To Other Party LitigationSettlementAmountAwardedToOtherParty	36000000	USD
CY2017Q2	fstr	Number Of Companies Receiving General Notice Letter NumberOfCompaniesReceivingGeneralNoticeLetter	140	company
CY2020Q3	fstr	Present Value Of Proposed Remedial Work PresentValueOfProposedRemedialWork	1100000000	USD
CY2020Q3	fstr	Undiscovered Remedial Work UndiscoveredRemedialWork	1700000000	USD
	fstr	Remedial Work Anticipated Clean Up Period RemedialWorkAnticipatedCleanUpPeriod	P13Y
CY2020Q3	fstr	Number Of Potentially Responsible Parties Included In Agreement NumberOfPotentiallyResponsiblePartiesIncludedInAgreement	100	company
CY2020Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2562000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2608000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2608000	USD
	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	46000	USD
CY2020Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2562000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-13742000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2836000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	836000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4590000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	480000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-4.846
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.182
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-11698000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11845000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3883000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	21656000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.988
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.179
	fstr	Discrete Income Tax Benefit DiscreteIncomeTaxBenefit	15824000	USD
CY2020Q3	fstr	Discrete Income Tax Benefit DiscreteIncomeTaxBenefit	15824000	USD
CY2020Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	9008000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	1332000	USD

Files In Submission

Name	View Source	Status
0000352825-20-000057-index-headers.html	Edgar Link	pending
0000352825-20-000057-index.html	Edgar Link	pending
0000352825-20-000057.txt	Edgar Link	pending
0000352825-20-000057-xbrl.zip	Edgar Link	pending
ex-311q32020.htm	Edgar Link	pending
ex-312q32020.htm	Edgar Link	pending
ex-320q32020.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
fstr-20200930.htm	Edgar Link	pending
fstr-20200930.xsd	Edgar Link	pending
fstr-20200930_cal.xml	Edgar Link	unprocessable
fstr-20200930_def.xml	Edgar Link	unprocessable
fstr-20200930_htm.xml	Edgar Link	completed
fstr-20200930_lab.xml	Edgar Link	unprocessable
fstr-20200930_pre.xml	Edgar Link	unprocessable
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$FSTR
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2020 Q4 Form 10-Q Financial Statement

#000035282520000057 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSTR FOSTER L B CO Stock $fstr

2020 Q4 Form 10-Q Financial Statement

#000035282520000057 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSTR
FOSTER L B CO Stock $fstr