$FSTR
FOSTER L B CO Stock $fstr

$fstr Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000035282521000068 Filed on November 03, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$113.0M	$130.1M	$118.4M
YoY Change	-2.26%	9.87%	-18.28%
Cost Of Revenue	$93.93M	$107.8M	$96.30M
YoY Change	0.03%	11.91%	-17.62%
Gross Profit	$19.04M	$22.28M	$22.06M
YoY Change	-12.22%	0.97%	-21.07%
Gross Profit Margin	16.85%	17.13%	18.64%
Selling, General & Admin	$18.15M	$20.06M	$17.07M
YoY Change	4.29%	17.52%	-18.87%
% of Gross Profit	95.33%	90.03%	77.36%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.441M	$2.041M	$1.940M
YoY Change	-0.84%	5.21%	-3.24%
% of Gross Profit	18.08%	9.16%	8.79%
Operating Expenses	$19.26M	$20.06M	$17.07M
YoY Change	3.55%	17.52%	-18.87%
Operating Profit	-$226.0K	$2.220M	$6.117M
YoY Change	-107.33%	-63.71%	-31.81%
Interest Expense	-$502.0K	$722.0K	$940.0K
YoY Change	-206.81%	-23.19%	-185.45%
% of Operating Profit		32.52%	15.37%
Other Income/Expense, Net		$2.880M	$209.0K
YoY Change		1277.99%	-44.12%
Pretax Income	-$728.0K	$2.916M	$2.836M
YoY Change	-134.67%	2.82%	-38.21%
Income Tax	-$375.0K	$676.0K	-$13.74M
% Of Pretax Income		23.18%	-484.56%
Net Earnings	-$334.0K	$2.342M	$6.830M
YoY Change	-115.94%	-65.71%	122.91%
Net Earnings / Revenue	-0.3%	1.8%	5.77%
Basic Earnings Per Share		$0.22	$0.65
Diluted Earnings Per Share	-$31.37K	$0.22	$0.64
COMMON SHARES
Basic Shares Outstanding	10.83M shares	10.64M shares	10.56M shares
Diluted Shares Outstanding		10.76M shares	10.66M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$10.37M	$6.405M	$9.300M
YoY Change	36.47%	-31.13%	-39.61%
Cash & Equivalents	$10.37M	$6.405M	$9.311M
Short-Term Investments
Other Short-Term Assets	$14.15M	$14.71M	$15.18M
YoY Change	8.84%	-3.06%	139.9%
Inventory	$62.87M	$108.9M	$117.3M
Prepaid Expenses
Receivables	$55.91M	$105.8M	$98.30M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$179.5M	$194.6M	$203.2M
YoY Change	-8.11%	-4.2%	-13.73%
LONG-TERM ASSETS
Property, Plant & Equipment	$73.35M	$73.21M	$79.40M
YoY Change	-6.2%	-7.79%	-4.1%
Goodwill	$20.15M	$20.15M	$19.82M
YoY Change	-0.92%	1.63%	4.72%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$1.346M	$1.336M	$1.172M
YoY Change	11.79%	13.99%	-9.5%
Total Long-Term Assets	$163.1M	$165.2M	$175.8M
YoY Change	-6.83%	-6.02%	9.31%
TOTAL ASSETS
Total Short-Term Assets	$179.5M	$194.6M	$203.2M
Total Long-Term Assets	$163.1M	$165.2M	$175.8M
Total Assets	$342.6M	$359.8M	$378.9M
YoY Change	-7.51%	-5.05%	-4.38%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$41.41M	$53.69M	$60.18M
YoY Change	-24.41%	-10.79%	-17.84%
Accrued Expenses	$13.76M	$12.96M	$13.32M
YoY Change	-12.6%	-2.69%	-5.87%
Deferred Revenue	$13.41M	$13.15M	$7.835M
YoY Change	87.72%	67.89%	-10.05%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$98.00K	$111.0K	$100.0K
YoY Change	-2.0%	11.0%	-96.67%
Total Short-Term Liabilities	$86.19M	$97.94M	$99.24M
YoY Change	-9.56%	-1.32%	-17.79%
LONG-TERM LIABILITIES
Long-Term Debt	$31.15M	$32.34M	$49.00M
YoY Change	-30.62%	-34.0%	-30.0%
Other Long-Term Liabilities	$9.606M	$11.24M	$10.64M
YoY Change	-18.3%	5.63%	-33.92%
Total Long-Term Liabilities	$9.606M	$11.24M	$10.64M
YoY Change	-18.3%	5.63%	-33.92%
TOTAL LIABILITIES
Total Short-Term Liabilities	$86.19M	$97.94M	$99.24M
Total Long-Term Liabilities	$9.606M	$11.24M	$10.64M
Total Liabilities	$95.80M	$109.2M	$109.9M
YoY Change	-10.52%	-0.64%	-19.69%
SHAREHOLDERS EQUITY
Retained Earnings	$168.7M	$169.1M	$163.0M
YoY Change	2.2%	3.71%	24.18%
Common Stock	$111.0K	$111.0K	$111.0K
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$10.18M	$10.92M	$12.72M
YoY Change	-19.87%	-14.19%	-24.4%
Treasury Stock Shares	445.4K shares	470.1K shares	553.4K shares
Shareholders Equity	$183.1M	$182.1M	$173.4M
YoY Change
Total Liabilities & Shareholders Equity	$342.6M	$359.8M	$378.9M
YoY Change	-7.51%	-5.05%	-4.38%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	-$334.0K	$2.342M	$6.830M
YoY Change	-115.94%	-65.71%	122.91%
Depreciation, Depletion And Amortization	$3.441M	$2.041M	$1.940M
YoY Change	-0.84%	5.21%	-3.24%
Cash From Operating Activities	$6.000M	-$13.65M	$9.390M
YoY Change	64.84%	-245.39%	-53.9%
INVESTING ACTIVITIES
Capital Expenditures	-$1.052M	-$1.320M	-$220.0K
YoY Change	-31.24%	500.0%	-116.42%
Acquisitions
YoY Change
Other Investing Activities	-$36.00K	$22.48M	-$1.050M
YoY Change	-64.0%	-2240.76%	2000.0%
Cash From Investing Activities	-$1.088M	$21.16M	-$1.270M
YoY Change	-33.25%	-1765.98%	-198.45%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-874.0K	-5.112M	-6.460M
YoY Change	-78.84%	-20.87%	-64.29%
NET CHANGE
Cash From Operating Activities	6.000M	-13.65M	9.390M
Cash From Investing Activities	-1.088M	21.16M	-1.270M
Cash From Financing Activities	-874.0K	-5.112M	-6.460M
Net Change In Cash	4.038M	2.394M	1.660M
YoY Change	-290.47%	44.22%	-53.5%
FREE CASH FLOW
Cash From Operating Activities	$6.000M	-$13.65M	$9.390M
Capital Expenditures	-$1.052M	-$1.320M	-$220.0K
Free Cash Flow	$7.052M	-$12.33M	$9.610M
YoY Change	36.4%	-228.32%	-49.5%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2021Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	10024000	USD
	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
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent
CY2021Q3	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2021Q3	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2021Q3	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	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	true
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2021Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	10834105	shares
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6405000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7564000	USD
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CY2021Q3	us-gaap	Inventory Net InventoryNet	108895000	USD
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CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	15740000	USD
CY2021Q3	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
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CY2021Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3950000	USD
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	us-gaap	Gross Profit GrossProfit	67267000	USD
	us-gaap	Gross Profit GrossProfit	73321000	USD
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	us-gaap	Interest Expense InterestExpense	2454000	USD
	us-gaap	Interest Expense InterestExpense	2841000	USD
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CY2021Q3	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	-30000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	0	USD
	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	-64000	USD
	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	0	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	2270000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	16578000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3888000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	23543000	USD
CY2021Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	72000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-13478000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	72000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-23565000	USD
CY2021Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2020Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-3730000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-5509000	USD
CY2021Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	72000	USD
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-9748000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	72000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-18056000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	2342000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	6830000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3960000	USD
	us-gaap	Net Income Loss NetIncomeLoss	5487000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.21
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.57
	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
CY2021Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	0.01
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-0.92
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	0.01
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicShare	-1.72
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.21
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.56
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.36
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.21
CY2021Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-0.92
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	0.01
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare	-1.69
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2021Q3	us-gaap	Profit Loss ProfitLoss	2312000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6830000	USD
	us-gaap	Profit Loss ProfitLoss	3896000	USD
	us-gaap	Profit Loss ProfitLoss	5487000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1610000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1818000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-649000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1708000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-11000	USD
CY2020Q3	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	-11000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	277000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-33000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-33000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-809000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	99000	USD
CY2020Q3	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	295000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	98000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-136000	USD
CY2020Q3	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	-409000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-137000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-23000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-15000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-71000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-46000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	92000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	66000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	274000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	200000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	897000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	8851000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3897000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3307000	USD
CY2021Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-30000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-64000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-31000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-10000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-61000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-74000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	958000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8851000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3971000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3307000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3824000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	23543000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	526000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-8653000	USD
	us-gaap	Depreciation Depreciation	6049000	USD
	us-gaap	Depreciation Depreciation	5838000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	4397000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	4271000	USD
	fstr	Equity Loss Income And Remeasurement Gain EquityLossIncomeAndRemeasurementGain	-5000	USD
	fstr	Equity Loss Income And Remeasurement Gain EquityLossIncomeAndRemeasurementGain	0	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-30000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1800000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1842000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	2741000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	6384000	USD
	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-12099000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	12665000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-529000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1245000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1527000	USD
	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	-776000	USD
	us-gaap	Increase Decrease In Prepaid Taxes IncreaseDecreaseInPrepaidTaxes	9241000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-2063000	USD
	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	3393000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-892000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-3739000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	6046000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-575000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	852000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-4012000	USD
	fstr	Increase Decrease In Accrued Settlement IncreaseDecreaseInAccruedSettlement	4000000	USD
	fstr	Increase Decrease In Accrued Settlement IncreaseDecreaseInAccruedSettlement	4000000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-3461000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-106000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-1780000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	3325000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-6810000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	16201000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-253000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-2921000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3568000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7650000	USD
	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	22707000	USD
	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	229000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1050000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	18910000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-8688000	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0	USD
	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	2278000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	147224000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	134155000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	134705000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	125122000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	358000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	454000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	549000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1660000	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	396000	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-13030000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-11147000	USD
	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	0	USD
	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-19000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	24000	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	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1159000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4867000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	7564000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14178000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6405000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	9311000	USD
	us-gaap	Interest Paid Net InterestPaidNet	2205000	USD
	us-gaap	Interest Paid Net InterestPaidNet	2453000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	1215000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	2330000	USD
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	180892000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	2312000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-92000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1610000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-33000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-136000	USD
CY2021Q3	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	8113	shares
CY2021Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-2000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	587000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	182374000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	163896000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	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 Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	173351000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	176830000	USD
	us-gaap	Profit Loss ProfitLoss	3896000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-274000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-649000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-33000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-409000	USD
	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	114288	shares
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-549000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1800000	USD
	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	396000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	182374000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	169862000	USD
	us-gaap	Profit Loss ProfitLoss	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 Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	173351000	USD
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:3pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reclassifications</span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain accounts in the prior year consolidated financial statements have been reclassified for comparative purposes principally to conform to the presentation of the current year period. Effective for the quarter ended September 30, 2020, the Company classified IOS Acquisitions, LLC and subsidiaries (“Test and Inspection Services”) as a discontinued operation. Effective for the quarter and year ended December 31, 2020, the Company implemented operational changes in how its Chief Operating Decision Maker (“CODM”) manages its businesses, including resource allocation and operating decisions. As a result of these changes, the Company now has two operating segments, Rail Technologies and Services and Infrastructure Solutions, representing the individual businesses that are run separately under the new structure. The Company has revised the information for all periods presented in this Quarterly Report on Form 10-Q to reflect these reclassifications.</span></div>
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2021Q3	us-gaap	Assets Assets	359803000	USD
CY2020Q4	us-gaap	Assets Assets	370395000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	41164000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	37843000	USD
CY2021Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4840000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	1324000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	130053000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	118365000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	400655000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	381835000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	130053000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	118365000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	400655000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	381835000	USD
	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	20561000	USD
	fstr	Contractwith Customer Liability Increasefrom Cash Receipts ContractwithCustomerLiabilityIncreasefromCashReceipts	4512000	USD
CY2021Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	81000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	175000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	985000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	3708000	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	231726000	USD
CY2021Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.112
CY2020Q4	us-gaap	Goodwill Goodwill	20340000	USD
	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-21000	USD
	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-172000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	20147000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	80085000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	47635000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	32450000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	80276000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	43379000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	36897000	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1462000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1428000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4397000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4271000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1445000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5749000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5278000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4284000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2467000	USD
CY2021Q3	fstr	Finite Lived Intangible Asset Expected Amortization Due After Year Four FiniteLivedIntangibleAssetExpectedAmortizationDueAfterYearFour	13227000	USD
CY2021Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	32450000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	523000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	944000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-127000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	221000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	944000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-127000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	294000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	523000	USD
CY2021Q3	us-gaap	Inventory Finished Goods InventoryFinishedGoods	29597000	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	60766000	USD
CY2021Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	41164000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	37843000	USD
CY2021Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	9767000	USD
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	5143000	USD
CY2021Q3	us-gaap	Inventory Raw Materials InventoryRawMaterials	28367000	USD
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	12708000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	108895000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	116460000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	160687000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	168638000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	101876000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	106553000	USD
CY2021Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	58811000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	62085000	USD
CY2021Q3	us-gaap	Depreciation Depreciation	2041000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	1940000	USD
	us-gaap	Depreciation Depreciation	6049000	USD
	us-gaap	Depreciation Depreciation	5838000	USD
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
	fstr	Lessee Lease Renewal Term LesseeLeaseRenewalTerm	P12Y
	fstr	Lessee Lease Termination Period LesseeLeaseTerminationPeriod	P1Y
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	14403000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	16069000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2444000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2553000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	11959000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	13516000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	14403000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	16069000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	1162000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	1116000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	977000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	869000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	185000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	247000	USD
CY2021Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	111000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	119000	USD
CY2021Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	74000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	128000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	185000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	247000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	50000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	29000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	152000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	381000	USD
CY2021Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	19000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	17000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	61000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	53000	USD
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	706000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	719000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2042000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2265000	USD
CY2021Q3	us-gaap	Sublease Income SubleaseIncome	50000	USD
CY2020Q3	us-gaap	Sublease Income SubleaseIncome	50000	USD
	us-gaap	Sublease Income SubleaseIncome	150000	USD
	us-gaap	Sublease Income SubleaseIncome	117000	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	725000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	715000	USD
	us-gaap	Lease Cost LeaseCost	2105000	USD
	us-gaap	Lease Cost LeaseCost	2582000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2462000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2778000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	166000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	408000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	377000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7681000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.052
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.051
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.042
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.042
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	817000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	41000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3037000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	115000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2715000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	42000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2604000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	11000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2385000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2021Q3	fstr	Lessee Operating Lease Liability Payments Due After Year Four LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	5379000	USD
CY2021Q3	fstr	Finance Lease Liability To Be Paid Due After Year Four FinanceLeaseLiabilityToBePaidDueAfterYearFour	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	16937000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	209000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2534000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	24000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	14403000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	185000	USD
CY2021Q3	us-gaap	Line Of Credit LineOfCredit	32268000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	44777000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	185000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	247000	USD
CY2021Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	32453000	USD
CY2020Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	45024000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	111000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	119000	USD
CY2021Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	32342000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	44905000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2240000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	16578000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3824000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	23543000	USD
CY2021Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	72000	USD
CY2020Q3	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-9748000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	72000	USD
	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-18056000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	2312000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	6830000	USD
	us-gaap	Profit Loss ProfitLoss	3896000	USD
	us-gaap	Profit Loss ProfitLoss	5487000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10642000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10562000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10615000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10533000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10642000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10562000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10615000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10533000	shares
CY2021Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	122000	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	97000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	129000	shares
	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	121000	shares
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	122000	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	97000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	129000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	121000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10764000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10659000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10744000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10654000	shares
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.21
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.57
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1494000	USD
	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
CY2021Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.92
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-1.72
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2021Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.21
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.56
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.36
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.21
CY2021Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.92
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
	fstr	Defined Contribution Plan Number DefinedContributionPlanNumber	6	plan
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-1.69
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	676000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2916000	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
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.232
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-4.846
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	5318000	USD
	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	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.281
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.988
	us-gaap	Share Based Compensation ShareBasedCompensation	1800000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1842000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3647000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y4M24D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	18.05
	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	15.92
	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	19.08
	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	17.84
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	16.46
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	17.89
CY2021Q3	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	18000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	18000	USD
CY2021Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	18000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	18000	USD
CY2021Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	445000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1097000	USD
CY2021Q3	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	445000	USD
CY2020Q4	us-gaap	Financial Liabilities Fair Value Disclosure FinancialLiabilitiesFairValueDisclosure	1097000	USD
CY2021Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	564000	USD
CY2020Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	482000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1677000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	972000	USD
CY2020Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	1249000	USD
	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	411000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	783000	USD
CY2021Q3	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	877000	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
	us-gaap	Litigation Settlement Amount Awarded To Other Party LitigationSettlementAmountAwardedToOtherParty	28000000	USD
CY2017Q2	fstr	Number Of Companies Receiving General Notice Letter NumberOfCompaniesReceivingGeneralNoticeLetter	140	company
CY2021Q3	fstr	Present Value Of Proposed Remedial Work PresentValueOfProposedRemedialWork	1100000000	USD
CY2021Q3	fstr	Undiscovered Remedial Work UndiscoveredRemedialWork	1700000000	USD
	fstr	Remedial Work Anticipated Clean Up Period RemedialWorkAnticipatedCleanUpPeriod	P13Y
CY2021Q3	fstr	Number Of Potentially Responsible Parties Included In Agreement NumberOfPotentiallyResponsiblePartiesIncludedInAgreement	100	company
CY2021Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2481000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2562000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2562000	USD
	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	81000	USD
CY2021Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	2481000	USD

Files In Submission

Name	View Source	Status
0000352825-21-000068-index-headers.html	Edgar Link	pending
0000352825-21-000068-index.html	Edgar Link	pending
0000352825-21-000068.txt	Edgar Link	pending
0000352825-21-000068-xbrl.zip	Edgar Link	pending
ex-21q32021.htm	Edgar Link	pending
ex-311q32021.htm	Edgar Link	pending
ex-312q32021.htm	Edgar Link	pending
ex-320q32021.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
fstr-20210930.htm	Edgar Link	pending
fstr-20210930.xsd	Edgar Link	pending
fstr-20210930_cal.xml	Edgar Link	unprocessable
fstr-20210930_def.xml	Edgar Link	unprocessable
fstr-20210930_htm.xml	Edgar Link	completed
fstr-20210930_lab.xml	Edgar Link	unprocessable
fstr-20210930_pre.xml	Edgar Link	unprocessable
MetaLinks.json	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$FSTR
FOSTER L B CO Stock $fstr

2021 Q4 Form 10-Q Financial Statement

#000035282521000068 Filed on November 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSTR FOSTER L B CO Stock $fstr

2021 Q4 Form 10-Q Financial Statement

#000035282521000068 Filed on November 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSTR
FOSTER L B CO Stock $fstr