L.B. Foster (FSTR) 10-Q 4 Aug 21 2021 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2021	Jul. 28, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Commission File Number	000-10436
Entity Registrant Name	FOSTER L B CO
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1324733
Entity Address, Street Name	415 Holiday Drive
Entity Address, Suite	Suite 100
Entity Address, City	Pittsburgh
Entity Address, State	PA
Entity Address, Postal Zip Code	15220
City Area Code	412
Local Phone Number	928-3400
Title of each class	Common stock, par value $0.01
Trading Symbol(s)	FSTR
Name of each exchange on which registered	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,834,481
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000352825
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 4,140	$ 7,564
Accounts receivable - net (Note 6)	78,356	58,298
Inventories - net (Note 7)	114,236	116,460
Other current assets	13,737	12,997
Total current assets	210,469	195,319
Property, plant, and equipment - net (Note 8)	60,526	62,085
Operating lease right-of-use assets - net (Note 9)	15,010	16,069
Other assets:
Goodwill (Note 5)	20,428	20,340
Other intangibles - net (Note 5)	34,038	36,897
Deferred tax assets (Note 12)	38,452	38,481
Other assets	1,018	1,204
TOTAL ASSETS	379,941	370,395
Current liabilities:
Accounts payable	65,837	54,787
Deferred revenue	17,322	7,144
Accrued payroll and employee benefits	7,714	9,182
Current portion of accrued settlement (Note 16)	8,000	8,000
Current maturities of long-term debt (Note 10)	124	119
Other accrued liabilities	12,888	15,740
Current liabilities of discontinued operations (Note 3)	77	330
Total current liabilities	111,962	95,302
Long-term debt (Note 10)	37,121	44,905
Deferred tax liabilities (Note 12)	4,010	4,085
Long-term portion of accrued settlement (Note 16)	22,000	24,000
Long-term operating lease liabilities (Note 9)	12,482	13,516
Other long-term liabilities	11,474	11,757
Stockholders’ equity:
Common stock, par value $0.01, authorized 20,000,000 shares; shares issued at June 30, 2021 and December 31, 2020, 11,115,779; shares outstanding at June 30, 2021 and December 31, 2020, 10,637,580 and 10,563,290, respectively	111	111
Paid-in capital	43,650	44,583
Retained earnings	166,725	165,107
Treasury stock - at cost, 478,199 and 552,489 common stock shares at June 30, 2021 and December 31, 2020, respectively	(11,104)	(12,703)
Accumulated other comprehensive loss	(18,873)	(20,268)
Total L.B. Foster Company stockholders’ equity	180,509	176,830
Noncontrolling interest	383	0
Total stockholders’ equity	180,892	176,830
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 379,941	$ 370,395

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, issued (in shares)	11,115,779	11,115,779
Common stock, shares outstanding (in shares)	10,637,580	10,563,290
Treasury stock shares - at cost, common stock (in shares)	478,199	552,489

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total net sales	$ 154,522	$ 141,563	$ 270,602	$ 263,470
Total cost of sales	128,361	113,425	225,611	212,210
Gross profit	26,161	28,138	44,991	51,260
Selling and administrative expenses	19,767	18,870	37,793	39,207
Amortization expense	1,470	1,413	2,935	2,843
Interest expense - net	861	1,089	1,732	1,901
Other expense (income) - net	70	(2,306)	129	(1,700)
Income from continuing operations before income taxes	3,993	9,072	2,402	9,009
Income tax expense from continuing operations	1,139	2,102	818	2,044
Income from continuing operations	2,854	6,970	1,584	6,965
Net loss attributable to noncontrolling interest	(22)	0	(34)	0
Income from continuing operations attributable to L.B. Foster Company	2,876	6,970	1,618	6,965
Discontinued operations:
Loss from discontinued operations before income taxes	0	(7,456)	0	(10,087)
Income tax benefit from discontinued operations	0	(1,009)	0	(1,779)
Loss from discontinued operations	0	(6,447)	0	(8,308)
Net income (loss) attributable to L.B. Foster Company	$ 2,876	$ 523	$ 1,618	$ (1,343)
Basic income (loss) per common share:
From continuing operations (usd per share)	$ 0.27	$ 0.66	$ 0.15	$ 0.66
From discontinued operations (usd per share)	0	(0.61)	0	(0.79)
Basic income (loss) per common share (usd per share)	0.27	0.05	0.15	(0.13)
Diluted income (loss) per common share:
From continuing operations (usd per share)	0.27	0.66	0.15	0.66
From discontinued operations (usd per share)	0	(0.61)	0	(0.79)
Diluted income (loss) per common share (usd per share)	$ 0.27	$ 0.05	$ 0.15	$ (0.13)
Sales of goods
Total net sales	$ 138,309	$ 122,879	$ 238,855	$ 219,267
Total cost of sales	115,087	100,177	199,212	180,656
Sales of services
Total net sales	16,213	18,684	31,747	44,203
Total cost of sales	$ 13,274	$ 13,248	$ 26,399	$ 31,554

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (Loss)		$ 2,854	$ 523	$ 1,584	$ (1,343)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		538	181	961	(3,526)
Unrealized gain (loss) on cash flow hedges, net of tax expense (benefit) of $0, $19, $0, and $(277), respectively		0	55	0	(809)
Cash flow hedges reclassified to earnings, net of tax expense of $98, $0, $196, and $0, respectively		137	0	273	0
Reclassification of pension liability adjustments to earnings, net of tax expense of $24, $31, $48, and $55, respectively*	[1]	91	76	182	134
Total comprehensive income (loss)		3,620	835	3,000	(5,544)
Less comprehensive income (loss) attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest		(22)	0	(34)	0
Foreign currency translation adjustment		51	0	21	0
Amounts attributable to noncontrolling interest		29	0	(13)	0
Comprehensive income (loss) attributable to L.B. Foster Company		$ 3,591	$ 835	$ 3,013	$ (5,544)
[1]	Reclassifications out of “Accumulated other comprehensive loss” for pension obligations are charged to “Selling and administrative expenses” within the Condensed Consolidated Statements of Operations.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Unrealized loss on cash flow hedge, tax	$ 0	$ 19	$ 0	$ (277)
Cash flow hedges reclassified to earnings, tax	98	0	196	0
Reclassification of pension liability adjustments to earnings, tax	$ 24	$ 31	$ 48	$ 55

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income from continuing operations	$ 1,584	$ 6,965
Adjustments to reconcile net income from continuing operations to cash provided by (used in) operating activities:
Deferred income taxes	(93)	1,725
Depreciation	4,008	3,898
Amortization	2,935	2,843
Loss on sales and disposals of property, plant, and equipment	30	1
Stock-based compensation	1,213	1,238
Change in operating assets and liabilities:
Accounts receivable	(19,876)	(7,444)
Inventories	2,820	2,912
Other current assets	(1,391)	(2,540)
Prepaid income tax	741	(958)
Other noncurrent assets	1,215	(4,421)
Accounts payable	10,854	9,166
Deferred revenue	10,168	151
Accrued payroll and employee benefits	(1,506)	(3,896)
Accrued settlement	(2,000)	(2,000)
Other current liabilities	(2,561)	(3,510)
Other long-term liabilities	(1,299)	3,992
Net cash provided by continuing operating activities	6,842	8,122
Net cash used in discontinued operating activities	(253)	(1,974)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	0	11
Capital expenditures on property, plant, and equipment	(2,248)	(5,711)
Net cash used in continuing investing activities	(2,248)	(5,700)
Net cash used in discontinued investing activities	0	(1,722)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(90,666)	(86,345)
Proceeds from debt	82,899	83,748
Debt issuance costs	0	(418)
Treasury stock acquisitions	(547)	(1,660)
Investment of noncontrolling interest	396	0
Net cash used in continuing financing activities	(7,918)	(4,675)
Net cash used in discontinued financing activities	0	(14)
Effect of exchange rate changes on cash and cash equivalents	153	(828)
Net decrease in cash and cash equivalents	(3,424)	(6,791)
Cash and cash equivalents at beginning of period	7,564	14,178
Cash and cash equivalents at end of period	4,140	7,387
Supplemental disclosure of cash flow information:
Interest paid	1,439	1,504
Income taxes paid	$ 898	$ 1,327

Condensed Consolidated Statem_5

Condensed Consolidated Statements Of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning balance at Dec. 31, 2019	$ 169,862	$ 111	$ 49,204	$ 157,525	$ (16,795)	$ (20,183)	$ 0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(1,343)			(1,343)
Other comprehensive income, net of tax:
Pension liability adjustment	134					134
Foreign currency translation adjustment	(3,526)					(3,526)
Cash flow hedges reclassified to earnings	0
Unrealized derivative loss on cash flow hedges	(809)					(809)
Issuance of common shares, net of share withheld for taxes	(1,660)		(5,733)		4,073
Stock-based compensation	1,238		1,238
Ending balance at Jun. 30, 2020	163,896	111	44,709	156,182	(12,722)	(24,384)	0
Beginning balance at Mar. 31, 2020	162,506	111	44,328	155,659	(12,896)	(24,696)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	523			523
Other comprehensive income, net of tax:
Pension liability adjustment	76					76
Foreign currency translation adjustment	181					181
Cash flow hedges reclassified to earnings	0
Unrealized derivative loss on cash flow hedges	55					55
Issuance of common shares, net of share withheld for taxes	(3)		(177)		174
Stock-based compensation	558		558
Ending balance at Jun. 30, 2020	163,896	111	44,709	156,182	(12,722)	(24,384)	0
Beginning balance at Dec. 31, 2020	176,830	111	44,583	165,107	(12,703)	(20,268)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	1,584			1,618			(34)
Other comprehensive income, net of tax:
Pension liability adjustment	182					182
Foreign currency translation adjustment	961					940	21
Cash flow hedges reclassified to earnings	273					273
Unrealized derivative loss on cash flow hedges	0
Issuance of common shares, net of share withheld for taxes	(547)		(2,146)		1,599
Stock-based compensation	1,213		1,213
Investment of noncontrolling interest	396						396
Ending balance at Jun. 30, 2021	180,892	111	43,650	166,725	(11,104)	(18,873)	383
Beginning balance at Mar. 31, 2021	176,886	111	43,943	163,849	(11,783)	(19,588)	354
Increase (Decrease) in Stockholders' Equity
Net income (loss)	2,854			2,876			(22)
Other comprehensive income, net of tax:
Pension liability adjustment	91					91
Foreign currency translation adjustment	538					487	51
Cash flow hedges reclassified to earnings	137					137
Unrealized derivative loss on cash flow hedges	0
Issuance of common shares, net of share withheld for taxes	0		(679)		679
Stock-based compensation	386		386
Ending balance at Jun. 30, 2021	$ 180,892	$ 111	$ 43,650	$ 166,725	$ (11,104)	$ (18,873)	$ 383

Condensed Consolidated Statem_6

Condensed Consolidated Statements Of Stockholders' Equity (Unaudited) (Parenthetical) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Common shares issues net of shares withheld (in shares)	30,145	9,217	106,175	140,305

Financial Statements

Financial Statements	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Financial Statements	Financial Statements Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all estimates and adjustments (consisting of normal recurring accruals, unless otherwise stated herein) considered necessary for a fair presentation of the financial position of L.B. Foster Company and subsidiaries as of June 30, 2021 and December 31, 2020 and its Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Comprehensive Income (Loss), and Condensed Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2021 and 2020 and its Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2021 and 2020 have been included. However, actual results could differ from those estimates and changes in those estimates are recorded when known. The results of operations for interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Condensed Consolidated Balance Sheet as of December 31, 2020 was derived from audited financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and footnotes thereto included in L.B. Foster Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In this Quarterly Report on Form 10-Q, references to “we,” “us,” “our,” and the “Company” refer collectively to L.B. Foster Company and its consolidated subsidiaries. Reclassifications 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. Recently Issued Accounting Standards In March 2020 and as clarified in January 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. (“ASU”) 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. The amendments are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the impacts of the provisions of ASU 2020-04 on its financial condition, results of operations, and cash flows.

Business Segments

Business Segments	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Business Segments	Business Segments The Company provides products and services for the rail industry and solutions to support critical infrastructure projects. The Company’s innovative engineering and product development solutions address the safety, reliability, and performance of its customers’ challenging requirements. The Company maintains locations in North America, South America, Europe, and Asia. The Company’s segments represent components of the Company (a) that engage in activities from which revenue is generated and expenses are incurred, (b) whose operating results are regularly reviewed by the CODM, who uses such information to make decisions about resources to be allocated to the segments, and (c) for which discrete financial information is available. Operating segments are evaluated on their segment profit contribution to the Company’s consolidated results. Other income and expenses, interest, income taxes, and certain other items are managed on a consolidated basis. The Company’s segment accounting policies are described in Note 2 Business Segments of the Notes to the Company’s Consolidated Financial Statements contained in its Annual Report on Form 10-K for the year-ended December 31, 2020. The following table illustrates the Company’s revenues and profit from operations by segment for the periods indicated: Three Months Ended Three Months Ended Net Sales Segment Profit Net Sales Segment Profit Rail Technologies and Services $ 88,782 $ 5,963 $ 74,939 $ 5,816 Infrastructure Solutions 65,740 2,347 66,624 4,856 Total $ 154,522 $ 8,310 $ 141,563 $ 10,672 Six Months Ended Six Months Ended Net Sales Segment Profit Net Sales Segment Profit Rail Technologies and Services $ 155,014 $ 8,495 $ 145,143 $ 6,987 Infrastructure Solutions 115,588 1,681 118,327 6,461 Total $ 270,602 $ 10,176 $ 263,470 $ 13,448 Segment profit from operations, as shown above, includes allocated corporate operating expenses. Operating expenses related to corporate headquarter functions that directly support the segment activity are allocated based on segment headcount, revenue contribution, or activity of the business units within the segments, based on the corporate activity type provided to the segment. The expense allocation excludes certain corporate costs that are separately managed from the segments. The following table provides a reconciliation of segment net profit from continuing operations to the Company’s consolidated continuing operations total for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 Profit for reportable segments $ 8,310 $ 10,672 $ 10,176 $ 13,448 Interest expense - net (861) (1,089) (1,732) (1,901) Other (expense) income - net 256 2,292 197 2,421 Unallocated corporate expenses and other unallocated charges (3,712) (2,803) (6,239) (4,959) Income before income taxes from continuing operations $ 3,993 $ 9,072 $ 2,402 $ 9,009 The following table illustrates assets of the Company by segment for the periods presented: June 30, December 31, Rail Technologies and Services $ 176,863 $ 161,485 Infrastructure Solutions 137,433 137,519 Unallocated corporate assets 65,645 71,391 Total $ 379,941 $ 370,395

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued OperationsOn September 4, 2020, the Company completed the sale of the issued and outstanding membership interests of its upstream oil and gas test and inspection business, Test and Inspection Services. Proceeds from the sale were $4,000 and resulted in a loss of $10,034, net of tax. The Company has reflected the results of operations of the Test and Inspection Services business as discontinued operations in the Condensed Consolidated Financial Statements for all periods presented. The Test and Inspection Services business was historically included in the legacy Tubular and Energy segment, whose remaining divisions are now included as part of the Infrastructure Solutions segment. There was no activity regarding the Company’s discontinued operations during the three and six months ended June 30, 2021. The following table provides the net sales and losses from discontinued operations for the three and six months ended June 30, 2020: Three Months Ended Six Months Ended 2020 2020 Net sales $ 4,203 $ 11,071 Loss from discontinued operations before income taxes (7,456) (10,087) Income tax benefit from discontinued operations (1,009) (1,779) Loss from discontinued operations $ (6,447) $ (8,308)

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Revenue from products or services provided to customers over time accounted for 27.9% and 25.1% of revenue for the three months ended June 30, 2021 and 2020, respectively, and 26.8% and 25.9% of revenue for the six months ended June 30, 2021 and 2020, respectively. The majority of revenue under these long-term agreements is recognized over time either using an input measure based upon the proportion of actual costs incurred to estimated total project costs or an input measure based upon actual labor costs as a percentage of estimated total labor costs, depending upon which measure the Company believes best depicts its performance to date under the terms of the contract. Revenue recognized over time using an input measure was $27,687 and $24,858 for the three months ended June 30, 2021 and 2020, respectively, and $48,795 and $49,290 for the six months ended June 30, 2021 and 2020, respectively. A certain portion of the Company’s revenue recognized over time under these long-term agreements is recognized using an output method, specifically units delivered, based upon certain customer acceptance and delivery requirements. Revenue recognized over time using an output measure was $15,487 and $10,688 for the three months ended June 30, 2021 and 2020, respectively, and was $23,751 and $19,033 for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021 and December 31, 2020, the Company had contract assets of $40,496 and $37,843, respectively, that were recorded in “Inventories - net” within the Condensed Consolidated Balance Sheets. As of June 30, 2021 and December 31, 2020, the Company had contract liabilities of $6,098 and $1,324, respectively, that were recorded in “Deferred revenue” within the Condensed Consolidated Balance Sheets. The majority of the Company’s revenue is from products transferred and services rendered to customers at a point in time. Point in time revenue accounted for 72.1% and 74.9% of revenue for the three months ended June 30, 2021 and 2020, respectively, and 73.2% and 74.1% of revenue for the six months ended June 30, 2021 and 2020, respectively. The Company recognizes revenue at the point in time at which the customer obtains control of the product or service, which is generally when the product title passes to the customer upon shipment or the service has been rendered to the customer. In limited cases, title does not transfer and revenue is not recognized until the customer has received the products at a physical location. The following table summarizes the Company’s net sales by major product and service category for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 Rail Products $ 64,565 $ 56,500 $ 108,375 $ 104,399 Rail Technologies 24,217 18,439 46,639 40,744 Rail Technologies and Services 88,782 74,939 155,014 145,143 Fabricated Steel Products 32,223 25,580 59,944 43,971 Precast Concrete Products 20,073 16,428 32,751 27,071 Coatings and Measurement 13,444 24,616 22,893 47,285 Infrastructure Solutions 65,740 66,624 115,588 118,327 Total net sales $ 154,522 $ 141,563 $ 270,602 $ 263,470 Net sales by the timing of the transfer of products and services was as follows for the periods presented: Three Months Ended June 30, 2021 Rail Technologies Infrastructure Total Point in time $ 71,711 $ 39,637 $ 111,348 Over time 17,071 26,103 43,174 Total net sales $ 88,782 $ 65,740 $ 154,522 Three Months Ended June 30, 2020 Rail Technologies Infrastructure Total Point in time $ 61,275 $ 44,742 $ 106,017 Over time 13,664 21,882 35,546 Total net sales $ 74,939 $ 66,624 $ 141,563 Six Months Ended June 30, 2021 Rail Technologies Infrastructure Total Point in time $ 123,755 $ 74,301 $ 198,056 Over time 31,259 41,287 72,546 Total net sales $ 155,014 $ 115,588 $ 270,602 Six Months Ended June 30, 2020 Rail Technologies Infrastructure Total Point in time $ 116,163 $ 78,984 $ 195,147 Over time 28,980 39,343 68,323 Total net sales $ 145,143 $ 118,327 $ 263,470 The timing of revenue recognition, billings, and cash collections results in billed receivables, costs in excess of billings (contract assets, included in “Inventories - net”), and billings in excess of costs (contract liabilities, included in “Deferred revenue”) within the Condensed Consolidated Balance Sheets. Significant changes in contract assets during the six months ended June 30, 2021 resulted from transfers of $18,049 from the contract assets balance as of December 31, 2020 to receivables. Significant changes in contract liabilities during the six months ended June 30, 2021 resulted from increases of $5,524 due to billings in excess of costs, excluding amounts recognized as revenue during the period. Contract liabilities were reduced due to revenue recognized during the three months ended June 30, 2021 and 2020 of $228 and $1,237, respectively, and revenue recognized during the six months ended June 30, 2021 and 2020 of $904 and $3,851, respectively, which were included in contract liabilities at the beginning of each period. As of June 30, 2021, the Company had approximately $253,231 of obligations under new contracts and remaining performance obligations, which is also referred to as backlog. Approximately 10.8% of the June 30, 2021 backlog was related to projects that are anticipated to extend beyond June 30, 2022.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table presents the changes in goodwill balance by reportable segment for the period presented: Rail Technologies Infrastructure Total Balance as of December 31, 2020 $ 14,743 $ 5,597 $ 20,340 Foreign currency translation impact 88 — 88 Balance as of June 30, 2021 $ 14,831 $ 5,597 $ 20,428 The Company performs goodwill impairment tests annually during the fourth quarter, and also performs interim goodwill impairment tests if it is determined that it is more likely than not that the fair value of a reporting unit is less than the carrying amount. Qualitative factors are assessed to determine whether it is more likely than not that the fair value of a reporting unit is less than the carrying amount, which included the impacts of COVID-19. However, the future impacts of COVID-19 are unpredictable and are subject to change. No interim goodwill impairment test was required as a result of the evaluation of qualitative factors as of June 30, 2021. The components of the Company’s intangible assets were as follows for the periods presented: June 30, 2021 Weighted Average Gross Accumulated Net Patents 10 394 (220) 174 Customer relationships 18 36,402 (17,190) 19,212 Trademarks and trade names 16 7,820 (4,428) 3,392 Technology 13 35,841 (24,581) 11,260 $ 80,457 $ (46,419) $ 34,038 December 31, 2020 Weighted Average Gross Accumulated Net Patents 10 383 (206) 177 Customer relationships 18 36,269 (15,914) 20,355 Trademarks and trade names 16 7,809 (4,135) 3,674 Technology 13 35,815 (23,124) 12,691 $ 80,276 $ (43,379) $ 36,897 The Company amortizes intangible assets over their useful lives, which range from 5 to 25 years, with a total weighted average amortization period of approximately 16 years as of June 30, 2021. Amortization expense was $1,470 and $1,413 for the three months ended June 30, 2021 and 2020, respectively, and was $2,935 and $2,843 for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, estimated amortization expense for the remainder of 2021 and thereafter was as follows: Amortization Expense Remainder of 2021 $ 2,925 2022 5,786 2023 5,315 2024 4,324 2025 2,462 2026 and thereafter 13,226 $ 34,038

Accounts Receivable

Accounts Receivable	6 Months Ended
	Jun. 30, 2021
Accounts Receivable Additional Disclosures [Abstract]
Accounts Receivable	Accounts Receivable The Company extends credit based upon an evaluation of the customer’s financial condition and, while collateral is not required, the Company periodically receives surety bonds that guarantee payment. Credit terms are consistent with industry standards and practices. The amounts of trade accounts receivable as of June 30, 2021 and December 31, 2020 have been reduced by an allowance for credit losses of $780 and $944, respectively. Changes in reserves for uncollectible accounts, which are recorded as part of “Selling and administrative expenses” within the Condensed Consolidated Statements of Operations, resulted in expense of $40 and $221 for the three months ended June 30, 2021 and 2020, respectively, and expense of $18 and $307 for the six months ended June 30, 2021 and 2020, respectively. The Company established the allowance for credit losses by calculating the amount to reserve based on the age of a given trade receivable and considering historical collection patterns and bad debt expense experience, in addition to any other relevant subjective adjustments to individual receivables made by management. The Company also considers current and expected future market and other conditions. Trade receivables are pooled within the calculation based on a range of ages, which appropriately groups receivables of similar credit risk together. The established reserve thresholds to calculate the allowance for credit loss are based on and supported by historic collection patterns and bad debt expense incurred by the Company, as well as the expectation that collection patterns and bad debt expense will continue to adhere to patterns observed in recent years, which was formed based on trends observed as well as current and expected future conditions, including the impacts of the COVID-19 pandemic. Management maintains high-quality credit review practices as well as positive customer relationships that further mitigate credit risk. The following table sets forth the Company’s allowance for credit losses: Allowance for Credit Losses Balance as of December 31, 2020 $ 944 Current period provision 18 Write-off against allowance (182) Balance as of June 30, 2021 $ 780

Inventory

Inventory	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventory	Inventory Inventories as of June 30, 2021 and December 31, 2020 are summarized in the following table: June 30, December 31, Finished goods $ 47,474 $ 60,766 Contract assets 40,496 37,843 Work-in-process 4,527 5,143 Raw materials 21,739 12,708 Inventories - net $ 114,236 $ 116,460 Inventories of the Company are valued at average cost or net realizable value, whichever is lower. Contract assets consist of costs and earnings in excess of billings, retainage, and other unbilled amounts generated when revenue recognized exceeds the amount billed to the customer. The Company records appropriate provisions related to the allowance for credit losses associated with contract assets, as these assets held in inventory will convert to trade receivables once the customer is billed under the contract to which they pertain. Provisions are recorded based on the specific review of individual contracts as necessary, and a standard provision is recorded over any remaining contract assets pooled together based on similar low risk of credit loss. The development of these provisions are based on historic collection trends, accuracy of estimates within contract margin reporting, as well as the expectation that collection patterns, margin reporting, and bad debt expense will continue to adhere to patterns observed in recent years. These expectations were formed based on trends observed as well as current and expected future conditions.

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant, and Equipment Property, plant, and equipment as of June 30, 2021 and December 31, 2020 consisted of the following: June 30, December 31, Land $ 6,636 $ 6,627 Improvements to land and leaseholds 17,771 17,573 Buildings 27,598 27,348 Machinery and equipment, including equipment under finance leases 118,060 116,175 Construction in progress 1,325 915 Gross property, plant, and equipment 171,390 168,638 Less accumulated depreciation and amortization, including accumulated amortization of finance leases (110,864) (106,553) Property, plant, and equipment - net $ 60,526 $ 62,085 Depreciation expense was $2,018 and $1,963 for the three months ended June 30, 2021 and 2020, respectively, and $4,008 and $3,898 for the six months ended June 30, 2021 and 2020, respectively. The Company reviews its property, plant, and equipment for recoverability whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. The Company recognizes an impairment loss if it believes that the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. There were no impairments of property, plant, and equipment during the six months ended June 30, 2021 and 2020.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	Leases The Company determines if an arrangement is a lease at its inception. Operating leases are included in “Operating lease right-of-use assets - net,” “Other accrued liabilities,” and “Long-term operating lease liabilities” within the Condensed Consolidated Balance Sheets. Finance leases are included within “Property, plant, and equipment - net,” “Current maturities of long-term debt,” and “Long-term debt” within the Condensed Consolidated Balance Sheets. The Company has operating and finance leases for manufacturing facilities, corporate offices, sales offices, vehicles, and certain equipment. As of June 30, 2021, the Company’s leases had remaining lease terms of 2 to 12 years, some of which include options to extend the leases for up to 12 years, and some of which include options to terminate the leases within 1 year. The balance sheet components of the Company’s leases were as follows as of June 30, 2021 and December 31, 2020: June 30, December 31, 2020 Operating leases Operating lease right-of-use assets $ 15,010 $ 16,069 Other accrued liabilities $ 2,528 $ 2,553 Long-term operating lease liabilities 12,482 13,516 Total operating lease liabilities $ 15,010 $ 16,069 Finance leases Property, plant, and equipment $ 1,163 $ 1,116 Accumulated amortization (943) (869) Property, plant, and equipment - net $ 220 $ 247 Current maturities of long-term debt $ 124 $ 119 Long-term debt 96 128 Total finance lease liabilities $ 220 $ 247 The components of lease expense within the Company’s Condensed Consolidated Statements of Operations were as follows for the three and six months ended June 30, 2021 and 2020: Three Months Ended Six Months Ended 2021 2020 2021 2020 Finance lease cost: Amortization of finance leases $ 51 $ 175 $ 102 $ 352 Interest on lease liabilities 20 18 42 36 Operating lease cost 694 748 1,336 1,546 Sublease income (50) (50) (100) (67) Total lease cost $ 715 $ 891 $ 1,380 $ 1,867 The cash flow components of the Company’s leases were as follows for the three and six months ended June 30, 2021 and 2020: Six Months Ended 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows related to operating leases $ (1,630) $ (1,965) Financing cash flows related to finance leases (111) (352) Right-of-use assets obtained in exchange for new lease liabilities: Operating leases $ 279 $ 6,435 The weighted-average remaining lease term (in years) and discount rate related to the operating leases were as follows as of the dates presented: June 30, 2021 2020 Operating lease weighted-average remaining lease term 7 8 Operating lease weighted-average discount rate 5.2 % 5.2 % Finance lease weighted-average remaining lease term 1 2 Finance lease weighted-average discount rate 4.2 % 4.2 % As of June 30, 2021, estimated annual maturities of lease liabilities remaining for the year ending December 31, 2021 and thereafter were as follows: Operating Leases Finance Leases Remainder of 2021 $ 1,676 $ 91 2022 2,991 115 2023 2,667 42 2024 2,589 11 2025 2,386 — 2026 and thereafter 5,383 — Total undiscounted lease payments 17,692 259 Interest (2,682) (39) Total $ 15,010 $ 220
Leases	Leases The Company determines if an arrangement is a lease at its inception. Operating leases are included in “Operating lease right-of-use assets - net,” “Other accrued liabilities,” and “Long-term operating lease liabilities” within the Condensed Consolidated Balance Sheets. Finance leases are included within “Property, plant, and equipment - net,” “Current maturities of long-term debt,” and “Long-term debt” within the Condensed Consolidated Balance Sheets. The Company has operating and finance leases for manufacturing facilities, corporate offices, sales offices, vehicles, and certain equipment. As of June 30, 2021, the Company’s leases had remaining lease terms of 2 to 12 years, some of which include options to extend the leases for up to 12 years, and some of which include options to terminate the leases within 1 year. The balance sheet components of the Company’s leases were as follows as of June 30, 2021 and December 31, 2020: June 30, December 31, 2020 Operating leases Operating lease right-of-use assets $ 15,010 $ 16,069 Other accrued liabilities $ 2,528 $ 2,553 Long-term operating lease liabilities 12,482 13,516 Total operating lease liabilities $ 15,010 $ 16,069 Finance leases Property, plant, and equipment $ 1,163 $ 1,116 Accumulated amortization (943) (869) Property, plant, and equipment - net $ 220 $ 247 Current maturities of long-term debt $ 124 $ 119 Long-term debt 96 128 Total finance lease liabilities $ 220 $ 247 The components of lease expense within the Company’s Condensed Consolidated Statements of Operations were as follows for the three and six months ended June 30, 2021 and 2020: Three Months Ended Six Months Ended 2021 2020 2021 2020 Finance lease cost: Amortization of finance leases $ 51 $ 175 $ 102 $ 352 Interest on lease liabilities 20 18 42 36 Operating lease cost 694 748 1,336 1,546 Sublease income (50) (50) (100) (67) Total lease cost $ 715 $ 891 $ 1,380 $ 1,867 The cash flow components of the Company’s leases were as follows for the three and six months ended June 30, 2021 and 2020: Six Months Ended 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows related to operating leases $ (1,630) $ (1,965) Financing cash flows related to finance leases (111) (352) Right-of-use assets obtained in exchange for new lease liabilities: Operating leases $ 279 $ 6,435 The weighted-average remaining lease term (in years) and discount rate related to the operating leases were as follows as of the dates presented: June 30, 2021 2020 Operating lease weighted-average remaining lease term 7 8 Operating lease weighted-average discount rate 5.2 % 5.2 % Finance lease weighted-average remaining lease term 1 2 Finance lease weighted-average discount rate 4.2 % 4.2 % As of June 30, 2021, estimated annual maturities of lease liabilities remaining for the year ending December 31, 2021 and thereafter were as follows: Operating Leases Finance Leases Remainder of 2021 $ 1,676 $ 91 2022 2,991 115 2023 2,667 42 2024 2,589 11 2025 2,386 — 2026 and thereafter 5,383 — Total undiscounted lease payments 17,692 259 Interest (2,682) (39) Total $ 15,010 $ 220

Long-term Debt and Related Matt

Long-term Debt and Related Matters	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Long-term Debt and Related Matters	Long-term Debt and Related Matters Long-term debt consisted of the following: June 30, December 31, Revolving credit facility $ 37,025 $ 44,777 Finance leases and financing agreements 220 247 Total 37,245 45,024 Less current maturities (124) (119) Long-term portion $ 37,121 $ 44,905 On June 26, 2020, the Company, its domestic subsidiaries, and certain of its Canadian and United Kingdom subsidiaries (collectively, the “Borrowers”), entered into the First Amendment (the “First Amendment”) to its Third Amended and Restated Credit Agreement (the “Credit Agreement”) with PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank, N.A., and BMO Harris Bank, N.A. The First Amendment modified the Credit Agreement, which had a maximum revolving credit line of $140,000 and provided for a $25,000 term loan of which $22,500 remained outstanding as of June 26, 2020. The First Amendment provided for a reduction in the revolving credit facility to permit aggregate borrowings of the Borrowers up to $120,000 with a sublimit of the equivalent of $25,000 U.S. dollars that is available to the Canadian and United Kingdom borrowers in the aggregate, and repaid and terminated the outstanding term loan by drawing funds on the revolving credit facility. The First Amendment provides additional $5,000 annual reductions to the revolving credit facility that began on December 31, 2020 through the maturity of the facility on April 30, 2024. Borrowings under the First Amendment bear interest at rates based upon either the base rate or Euro-rate plus applicable margins. The applicable margins have been adjusted as part of the First Amendment and are dictated by the ratio of the Company’s total net indebtedness to the Company’s consolidated earnings before interest, taxes, depreciation, and amortization (“Consolidated EBITDA”) for four trailing quarters, as defined in the Credit Agreement. The base rate is the highest of (a) the Overnight Bank Funding Rate plus 50 basis points, (b) the Prime Rate, or (c) the Daily Euro-rate plus 100 basis points (each as defined in the Credit Agreement) and an increase to the interest rate floor to 100 basis points. The base rate and Euro-rate spreads range from 100 to 200 basis points and 200 to 300 basis points, respectively. The First Amendment further provides for modifications to the financial covenants as defined in the Credit Agreement. The First Amendment modified three financial covenants in the Credit Agreement: (a) Maximum Gross Leverage Ratio, defined as the Company’s Consolidated Indebtedness divided by the Company’s Consolidated EBITDA, which must not exceed, other than during a period of four consecutive fiscal quarters of the Company beginning with a fiscal quarter during which the Company consummates a permitted acquisition, and including such fiscal quarter and the immediately three succeeding fiscal quarters (the “Acquisition Period”), (i) 3.25 to 1.00 for the testing period ended June 30, 2020, 3.00 to 1.00 for the testing periods ending September 30, 2020 through March 31, 2022, and 2.75 to 1.00 for the testing periods June 30, 2022 and thereafter, and (ii) 3.50 to 1.00 for the testing period ended June 30, 2020, 3.25 to 1.00 for the testing periods ending September 30, 2020 through March 31, 2022, and 3.00 to 1.00 for the testing periods ending June 30, 2022 and thereafter occurring during an Acquisition Period; (b) Minimum Consolidated Fixed Charge Coverage Ratio, defined as the Company’s Consolidated EBITDA divided by the Company’s Fixed Charges, which must be a minimum of 1.00 to 1.00 for the testing period ended June 30, 2020, 1.05 to 1.00 for the testing periods ending September 30, 2020 through June 30, 2021, 1.15 to 1.00 for the testing periods ending September 30, 2021 through June 30, 2022, and 1.25 to 1.00 for the testing periods ending September 30, 2022 and thereafter; and (c) Minimum Working Capital to Revolving Facility Usage Ratio, defined as the sum of 50% of the inventory and 85% of the accounts receivable of the Borrowers and certain other Guarantors divided by the dollar equivalent sum of the outstanding revolving credit loans, the outstanding swing loans, and the letter of credit obligations (the “Revolving Facility Usage”), which must not be less than 1.50 to 1.00. In addition, the First Amendment modifies the definition of Consolidated EBITDA to allow for certain additional adjustments. The First Amendment also includes changes to the non-financial covenants as defined in the Credit Agreement by increasing the basket for dispositions from $25,000 to $40,000. The Credit Agreement’s incremental loan feature permits the Company to increase the available revolving borrowings under the facility by up to an additional $50,000 subject to the Company’s receipt of increased commitments from existing or new lenders and the satisfaction of certain conditions. The Company’s and the domestic, Canadian, and United Kingdom guarantors’ (the “Guarantors”) obligations under the Credit Agreement, as amended, are secured by the grant of a security interest by the Borrowers and Guarantors in substantially all of the personal property owned by such entities. Additionally, the equity interests in each of the loan parties, other than the Company, and the equity interests held by each loan party in its respective domestic subsidiaries, have been pledged to the lenders as collateral for the lending obligations. The Credit Agreement, as amended, permits the Company to pay dividends and make distributions and redemptions with respect to its stock provided no event of default or potential default (as defined in the Credit Agreement) has occurred prior to or after giving effect to the dividend, distribution, or redemption. Additionally, the Credit Agreement, as amended, permits the Company to complete acquisitions so long as (a) no event of default or potential default has occurred prior to or as a result of such acquisition; (b) the liquidity of the Borrowers is not less than $25,000 prior to and after giving effect to such acquisition; and (c) the aggregate consideration for the acquisition did not exceed: (i) $50,000 per acquisition; (ii) $50,000 in the aggregate for multiple acquisitions entered into during four consecutive quarters; and (iii) $100,000 in the aggregate over the term of the Credit Agreement. Other restrictions exist at all times including, but not limited to, limitations on the Company’s sale of assets and the incurrence by either the Borrowers or the non-borrower subsidiaries of the Company of other indebtedness, guarantees, and liens. On January 29, 2021, the Company and the Borrowers entered into the Second Amendment (the “Second Amendment”) to the Credit Agreement, which permits the Company to incur indebtedness to finance insurance premiums in the ordinary course of business and allows for certain liens to secure the financing of insurance premiums. The Second Amendment also modifies the definition of Gross Leverage Ratio and Leverage Ratio in the Credit Agreement to exclude the Indebtedness permitted for the financing of insurance premiums in an aggregate amount not to exceed $3,000. As of June 30, 2021, the Company was in compliance with the covenants in the Credit Agreement, as amended. As of June 30, 2021, the Company had outstanding letters of credit of approximately $497 and had net available borrowing capacity of $77,478, subject to covenant restrictions. The maturity date of the facility is April 30, 2024.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share (Share amounts in thousands) The following table sets forth the computation of basic and diluted earnings (loss) per common share for the periods indicated: Three Months Ended Six Months Ended 2021 2020 2021 2020 Numerator for basic and diluted loss per common share: Income from continuing operations $ 2,854 $ 6,970 $ 1,584 $ 6,965 Loss from discontinued operations — (6,447) — (8,308) Net income (loss) $ 2,854 $ 523 $ 1,584 $ (1,343) Denominator: Weighted average shares outstanding 10,619 10,557 10,601 10,518 Denominator for basic income (loss) per common share 10,619 10,557 10,601 10,518 Effect of dilutive securities: Stock compensation plans 115 66 128 — Dilutive potential common shares 115 66 128 — Denominator for diluted income (loss) per common share - adjusted weighted average shares outstanding 10,734 10,623 10,729 10,518 Continuing operations $ 0.27 $ 0.66 $ 0.15 $ 0.66 Discontinued operations — (0.61) — (0.79) Basic income (loss) per common share $ 0.27 $ 0.05 $ 0.15 $ (0.13) Continuing operations $ 0.27 $ 0.66 $ 0.15 $ 0.66 Discontinued operations — (0.61) — (0.79) Diluted income (loss) per common share $ 0.27 $ 0.05 $ 0.15 $ (0.13) There were no anti-dilutive shares during the three months ended June 30, 2021 and 2020 and six months ended June 30, 2021. There were 131 anti-dilutive shares during the six months ended June 30, 2020.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFor the three months ended June 30, 2021 and 2020, the Company recorded an income tax expense of $1,139 on pre-tax income from continuing operations of $3,993 and an income tax expense of $2,102 on pre-tax income from continuing operations of $9,072, respectively, for effective income tax rates of 28.5% and 23.2%, respectively. For the six months ended June 30, 2021 and 2020, the Company recorded an income tax expense of $818 on pre-tax income from continuing operations of $2,402 and an income tax expense of $2,044 on pre-tax income from continuing operations of $9,009, respectively, for effective income tax rates of 34.1% and 22.7%, respectively. The Company’s effective tax rate for the three- and six-month periods ended differed from the federal statutory rate of 21% primarily due to state income taxes, nondeductible expenses, and research tax credits.

Stock-based Compensation

Stock-based Compensation	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]
Stock-based Compensation	Stock-based Compensation The Company applies the provisions of the FASB’s Accounting Standards Codification (“ASC”) Topic 718, “Compensation – Stock Compensation,” to account for the Company’s stock-based compensation. Stock-based compensation cost is measured at the grant date based on the calculated fair value of the award and is recognized over the employees’ requisite service periods. The Company recorded stock-based compensation expense related to restricted stock awards and performance share units of $386 and $558 for the three months ended June 30, 2021 and 2020, respectively, and expense of $1,213 and $1,238 for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, unrecognized compensation expense for unvested awards approximated $5,138. The Company expects to recognize this expense over the upcoming 3.7 years through February 2025. Shares issued as a result of vested stock-based compensation awards generally will be from previously issued shares that have been reacquired by the Company and held as treasury stock or authorized and previously unissued common stock. Restricted Stock Awards, Performance Share Units, and Performance-based Stock Awards Under the 2006 Omnibus Plan, the Company grants eligible employees restricted stock and performance share units. The forfeitable restricted stock awards granted generally time-vest ratably over a three-year period, unless indicated otherwise by the underlying restricted stock agreement. Since May 2018, awards of restricted stock have been subject to a minimum one-year vesting period, including those granted to non-employee directors. Prior to May 2018, awards to non-employee directors were made in fully-vested shares. Performance share units are offered annually under separate three-year long-term incentive programs. Performance share units are subject to forfeiture and will be converted into common stock of the Company based upon the Company’s performance relative to performance measures and conversion multiples, as defined in the underlying program. If the Company’s estimate of the number of performance share units expected to vest changes in a subsequent accounting period, cumulative compensation expense could increase or decrease. The change will be recognized in the current period for the vested shares and would change future expense over the remaining vesting period. Since May 1, 2017, non-employee directors have been permitted to defer receipt of annual stock awards and equity elected to be received in lieu of quarterly cash compensation. If so elected, these deferred stock units will be issued as common stock six months after separation from their service on the Board of Directors. Since May 2018, no non-employee directors have elected the option to receive deferred stock units of the Company’s common stock in lieu of director cash compensation. In February 2021, the Compensation Committee approved the 2021 Performance Share Unit Program and the Executive Annual Incentive Compensation Plan (consisting of cash and equity components). Also in February 2021, the Board of Directors approved a special performance-based stock retention program under the 2006 Omnibus Plan, whereby eligible executives could earn shares of Company common stock provided that the Company’s stock price achieves certain enumerated thirty-day average closing stock price hurdles over a five-year performance period. Any shares earned are payable no earlier than the third anniversary of the date of the grant. The program expires on February 28, 2026, after which date no shares may be earned or distributed. The following table summarizes the restricted stock awards, deferred stock units, and performance share units activity for the six months ended June 30, 2021: Restricted Deferred Performance Weighted Average Outstanding as of December 31, 2020 171,934 66,136 150,022 $ 18.05 Granted 108,300 8,814 141,471 16.13 Vested (98,234) — (7,940) 19.08 Adjustment for incentive awards expected to vest — — (55,743) 17.87 Outstanding as of June 30, 2021 182,000 74,950 227,810 $ 17.77

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company determines the fair value of assets and liabilities based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The fair values are based on assumptions that market participants would use when pricing an asset or liability, including assumptions about risk and the risks inherent in valuation techniques and the inputs to valuations. The fair value hierarchy is based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s own assumptions of what market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Unobservable inputs that are not corroborated by market data. The classification of a financial asset or liability within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. Cash equivalents - Included in “Cash and cash equivalents” within the Condensed Consolidated Balance Sheets are investments in non-domestic term deposits. The carrying amounts approximate fair value because of the short maturity of the instruments. LIBOR-based interest rate swaps - To reduce the impact of interest rate changes on outstanding variable-rate debt, the Company entered into forward starting LIBOR-based interest rate swaps with notional values totaling $50,000. The fair value of the interest rate swaps is based on market-observable forward interest rates and represents the estimated amount that the Company would pay to terminate the agreements. As such, the swap agreements are classified as Level 2 within the fair value hierarchy. As of June 30, 2021 and December 31, 2020, the interest rate swaps were recorded in “Other accrued liabilities” within the Condensed Consolidated Balance Sheets. Fair Value Measurements at Reporting Date Fair Value Measurements at Reporting Date June 30, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs December 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Term deposits $ 18 $ 18 $ — $ — $ 18 $ 18 $ — $ — Total assets $ 18 $ 18 $ — $ — $ 18 $ 18 $ — $ — Interest rate swaps $ 635 $ — $ 635 $ — $ 1,097 $ — $ 1,097 $ — Total liabilities $ 635 $ — $ 635 $ — $ 1,097 $ — $ 1,097 $ — Prior to the third quarter of 2020, the Company accounted for the interest rate swaps as cash flow hedges and the objective of the hedges is to offset the expected interest variability on payments associated with the interest rate on its debt. In the third quarter of 2020, the Company dedesignated its cash flow hedges and now accounts for all existing interest rate swaps on a mark-to-market basis with changes in fair value recorded in current period earnings. In connection with this dedesignation, the Company froze the balances recorded in “Accumulated other comprehensive loss” at June 30, 2020 and reclassifies balances to earnings as the underlying physical transactions occur, unless it is no longer probable that the physical transaction will occur at which time the related gains deferred in Other Comprehensive Income will be immediately recorded in earnings. The gains and losses related to the interest rate swaps are reclassified from “Accumulated other comprehensive loss” in the Condensed Consolidated Balance Sheets and included in “Interest expense - net” in the Condensed Consolidated Statements of Operations as the interest expense from the Company’s debt is recognized. For the three months ended June 30, 2021 and 2020, the Company recognized interest expense of $245 and $217, respectively, and for the six months ended June 30, 2021 and 2020, the Company recognized interest expense of $480 and $290, respectively, from interest rate swaps. In accordance with the provisions of ASC Topic 820, “Fair Value Measurement,” the Company measures certain nonfinancial assets and liabilities at fair value, which are recognized and disclosed on a nonrecurring basis.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 30, 2021
Employee-related Liabilities [Abstract]
Retirement Plans	Retirement Plans Retirement Plans The Company has three retirement plans that cover its hourly and salaried employees in the United States: one defined benefit plan, which is frozen, and two defined contribution plans. Employees are eligible to participate in the appropriate plan based on employment classification. The Company’s contributions to the defined benefit and defined contribution plans are governed by the Employee Retirement Income Security Act of 1974, as amended (“ERISA”) and the Company’s policy and investment guidelines applicable to each respective plan. The Company’s policy is to contribute at least the minimum in accordance with the funding standards of ERISA. The Company maintains two defined contribution plans for its employees in Canada, as well as one post-retirement benefit plan. The Company also maintains two defined contribution plans and one defined benefit plan for its employees in the United Kingdom. United States Defined Benefit Plan Net periodic pension costs for the United States defined benefit pension plan for the three and six months ended June 30, 2021 and 2020 were as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Interest cost $ 43 $ 56 $ 86 $ 112 Expected return on plan assets (62) (58) (124) (115) Recognized net actuarial loss 25 13 49 27 Net periodic pension cost $ 6 $ 11 $ 11 $ 24 The Company has made contributions to its United States defined benefit pension plan of $300 during the six months ended June 30, 2021 and expects to make total contributions of $450 during 2021. United Kingdom Defined Benefit Plan Net periodic pension costs for the United Kingdom defined benefit pension plan for the three and six months ended June 30, 2021 and 2020 were as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Interest cost $ 28 $ 43 $ 56 $ 86 Expected return on plan assets (65) (58) (130) (116) Amortization of prior service costs and transition amount 7 6 14 12 Recognized net actuarial loss 83 63 166 126 Net periodic pension cost $ 53 $ 54 $ 106 $ 108 United Kingdom regulations require trustees to adopt a prudent approach to funding required contributions to defined benefit pension plans. For the six months ended June 30, 2021, the Company contributed approximately $171 to the plan. The Company anticipates total contributions of approximately $342 to the United Kingdom pension plan during 2021. Defined Contribution Plans The Company sponsors six defined contribution plans for hourly and salaried employees across its domestic and international facilities. The following table summarizes the expense associated with the contributions made to these plans for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 United States $ 408 $ 433 $ 772 $ 295 Canada 40 30 86 69 United Kingdom 135 101 255 210 $ 583 $ 564 $ 1,113 $ 574

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Product Liability Claims The Company is subject to product warranty claims that arise in the ordinary course of its business. For certain manufactured products, the Company maintains a product warranty accrual, which is adjusted on a monthly basis as a percentage of cost of sales. In addition, the product warranty accrual is adjusted periodically based on the identification or resolution of known individual product warranty claims. The following table sets forth the Company’s product warranty accrual: Warranty Liability Balance as of December 31, 2020 $ 1,249 Additions to warranty liability 226 Warranty liability utilized (518) Balance as of June 30, 2021 $ 957 Union Pacific Railroad (“UPRR”) Concrete Tie Matter On March 13, 2019, the Company and its subsidiary, CXT Incorporated (“CXT”), entered into a Settlement Agreement (the “Settlement Agreement”) with UPRR to resolve the pending litigation in the matter of Union Pacific Railroad Company v. L.B. Foster Company and CXT Incorporated , Case No. CI 15-564, in the District Court for Douglas County, Nebraska. Under the Settlement Agreement, the Company and CXT will pay UPRR the aggregate amount of $50,000 without pre-judgment interest, which began with a $2,000 immediate payment, and with the remaining $48,000 paid in installments over a six-year period commencing on the effective date of the Settlement Agreement through December 2024 pursuant to a Promissory Note. Additionally, commencing in January 2019 and through December 2024, UPRR agreed to purchase and has been purchasing from the Company and its subsidiaries and affiliates, a cumulative total amount of $48,000 of products and services, targeting $8,000 of annual purchases per year beginning March 13, 2019 per letters of intent under the Settlement Agreement. The Settlement Agreement also includes a mutual release of all claims and liability regarding or relating to all CXT pre-stressed concrete railroad ties with no admission of liability and dismissal of the litigation with prejudice. The expected payments under the UPRR Settlement Agreement for the remainder of the year ending December 31, 2021 and thereafter are as follows: Year Ending December 31, Remainder of 2021 $ 6,000 2022 8,000 2023 8,000 2024 8,000 Total $ 30,000 Environmental and Legal Proceedings The Company is subject to national, state, foreign, provincial, and/or local laws and regulations relating to the protection of the environment. The Company’s efforts to comply with environmental regulations may have an adverse effect on its future earnings. On June 5, 2017, a General Notice Letter was received from the United States Environmental Protection Agency (“EPA”) indicating that the Company may be a potentially responsible party (“PRP”) regarding the Portland Harbor Superfund Site cleanup along with numerous other companies. More than 140 other companies received such a notice. The Company and a predecessor owned and operated a facility near the harbor site for a period prior to 1982. The net present value and undiscounted costs of the selected remedy throughout the harbor site are estimated by the EPA to be approximately $1.1 billion and $1.7 billion, respectively, and the remedial work is expected to take as long as 13 years to complete. These costs may increase given that the remedy will not be initiated or completed for several years. The Company is reviewing the basis for its identification by the EPA and the nature of the historic operations of a Company predecessor near the site. Additionally, the Company executed a PRP agreement which provides for a private allocation process among almost 100 PRPs in a working group whose work is ongoing. On March 26, 2020, the EPA issued a Unilateral Administrative Order to two parties requiring them to perform remedial design work for that portion of the Harbor Superfund Site that includes the area closest to the facility; the Company was not a recipient of this Unilateral Administrative Order. The Company cannot predict the ultimate impact of these proceedings because of the large number of PRPs involved throughout the harbor site, the size and extent of the site, the degree of contamination of various wastes, varying environmental impacts throughout the harbor site, the scarcity of data related to the facility once operated by the Company and a predecessor, potential comparative liability between the allocation parties and regarding non-participants, and the speculative nature of the remediation costs. Based upon information currently available, management does not believe that the Company’s alleged PRP status regarding the Portland Harbor Superfund Site or other compliance with the present environmental protection laws will have a material adverse effect on the financial condition, results of operations, cash flows, competitive position, or capital expenditures of the Company. As more information develops and the allocation process is completed, and given the resolution of factors like those described above, an unfavorable resolution could have a material adverse effect. As of June 30, 2021 and December 31, 2020, the Company maintained environmental reserves approximating $2,524 and $2,562, respectively. The following table sets forth the Company’s environmental obligation: Environmental liability Balance as of December 31, 2020 $ 2,562 Environmental obligations utilized (38) Balance as of June 30, 2021 $ 2,524 The Company is also subject to other legal proceedings and claims that arise in the ordinary course of its business. Legal actions are subject to inherent uncertainties, and future events could change management’s assessment of the probability or estimated amount of potential losses from pending or threatened legal actions. Based on available information, it is the opinion of management that the ultimate resolution of pending or threatened legal actions, both individually and in the aggregate, will not result in losses having a material adverse effect on the Company’s financial position or liquidity as of June 30, 2021. If management believes that, based on available information, it is at least reasonably possible that a material loss (or additional material loss in excess of any accrual) will be incurred in connection with any legal actions, the Company discloses an estimate of the possible loss or range of loss, either individually or in the aggregate, as appropriate, if such an estimate can be made, or discloses that an estimate cannot be made. Based on the Company’s assessment as of June 30, 2021, no such disclosures were considered necessary.

Financial Statements (Policies)

Financial Statements (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all estimates and adjustments (consisting of normal recurring accruals, unless otherwise stated herein) considered necessary for a fair presentation of the financial position of L.B. Foster Company and subsidiaries as of June 30, 2021 and December 31, 2020 and its Condensed Consolidated Statements of Operations, Condensed Consolidated Statements of Comprehensive Income (Loss), and Condensed Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2021 and 2020 and its Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2021 and 2020 have been included. However, actual results could differ from those estimates and changes in those estimates are recorded when known. The results of operations for interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The Condensed Consolidated Balance Sheet as of December 31, 2020 was derived from audited financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and footnotes thereto included in L.B. Foster Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In this Quarterly Report on Form 10-Q, references to “we,” “us,” “our,” and the “Company” refer collectively to L.B. Foster Company and its consolidated subsidiaries.
Reclassifications	Reclassifications 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.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In March 2020 and as clarified in January 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. (“ASU”) 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) or by another reference rate expected to be discontinued. The amendments are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the impacts of the provisions of ASU 2020-04 on its financial condition, results of operations, and cash flows.
Inventory	Inventories of the Company are valued at average cost or net realizable value, whichever is lower. Contract assets consist of costs and earnings in excess of billings, retainage, and other unbilled amounts generated when revenue recognized exceeds the amount billed to the customer.
Share Based Compensation	The Company applies the provisions of the FASB’s Accounting Standards Codification (“ASC”) Topic 718, “Compensation – Stock Compensation,” to account for the Company’s stock-based compensation. Stock-based compensation cost is measured at the grant date based on the calculated fair value of the award and is recognized over the employees’ requisite service periods.

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table illustrates the Company’s revenues and profit from operations by segment for the periods indicated: Three Months Ended Three Months Ended Net Sales Segment Profit Net Sales Segment Profit Rail Technologies and Services $ 88,782 $ 5,963 $ 74,939 $ 5,816 Infrastructure Solutions 65,740 2,347 66,624 4,856 Total $ 154,522 $ 8,310 $ 141,563 $ 10,672 Six Months Ended Six Months Ended Net Sales Segment Profit Net Sales Segment Profit Rail Technologies and Services $ 155,014 $ 8,495 $ 145,143 $ 6,987 Infrastructure Solutions 115,588 1,681 118,327 6,461 Total $ 270,602 $ 10,176 $ 263,470 $ 13,448
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	The following table provides a reconciliation of segment net profit from continuing operations to the Company’s consolidated continuing operations total for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 Profit for reportable segments $ 8,310 $ 10,672 $ 10,176 $ 13,448 Interest expense - net (861) (1,089) (1,732) (1,901) Other (expense) income - net 256 2,292 197 2,421 Unallocated corporate expenses and other unallocated charges (3,712) (2,803) (6,239) (4,959) Income before income taxes from continuing operations $ 3,993 $ 9,072 $ 2,402 $ 9,009
Reconciliation of Assets from Segment to Consolidated	The following table illustrates assets of the Company by segment for the periods presented: June 30, December 31, Rail Technologies and Services $ 176,863 $ 161,485 Infrastructure Solutions 137,433 137,519 Unallocated corporate assets 65,645 71,391 Total $ 379,941 $ 370,395

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	The following table provides the net sales and losses from discontinued operations for the three and six months ended June 30, 2020: Three Months Ended Six Months Ended 2020 2020 Net sales $ 4,203 $ 11,071 Loss from discontinued operations before income taxes (7,456) (10,087) Income tax benefit from discontinued operations (1,009) (1,779) Loss from discontinued operations $ (6,447) $ (8,308)

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table summarizes the Company’s net sales by major product and service category for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 Rail Products $ 64,565 $ 56,500 $ 108,375 $ 104,399 Rail Technologies 24,217 18,439 46,639 40,744 Rail Technologies and Services 88,782 74,939 155,014 145,143 Fabricated Steel Products 32,223 25,580 59,944 43,971 Precast Concrete Products 20,073 16,428 32,751 27,071 Coatings and Measurement 13,444 24,616 22,893 47,285 Infrastructure Solutions 65,740 66,624 115,588 118,327 Total net sales $ 154,522 $ 141,563 $ 270,602 $ 263,470 Net sales by the timing of the transfer of products and services was as follows for the periods presented: Three Months Ended June 30, 2021 Rail Technologies Infrastructure Total Point in time $ 71,711 $ 39,637 $ 111,348 Over time 17,071 26,103 43,174 Total net sales $ 88,782 $ 65,740 $ 154,522 Three Months Ended June 30, 2020 Rail Technologies Infrastructure Total Point in time $ 61,275 $ 44,742 $ 106,017 Over time 13,664 21,882 35,546 Total net sales $ 74,939 $ 66,624 $ 141,563 Six Months Ended June 30, 2021 Rail Technologies Infrastructure Total Point in time $ 123,755 $ 74,301 $ 198,056 Over time 31,259 41,287 72,546 Total net sales $ 155,014 $ 115,588 $ 270,602 Six Months Ended June 30, 2020 Rail Technologies Infrastructure Total Point in time $ 116,163 $ 78,984 $ 195,147 Over time 28,980 39,343 68,323 Total net sales $ 145,143 $ 118,327 $ 263,470

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents the changes in goodwill balance by reportable segment for the period presented: Rail Technologies Infrastructure Total Balance as of December 31, 2020 $ 14,743 $ 5,597 $ 20,340 Foreign currency translation impact 88 — 88 Balance as of June 30, 2021 $ 14,831 $ 5,597 $ 20,428
Schedule of Intangible Assets	The components of the Company’s intangible assets were as follows for the periods presented: June 30, 2021 Weighted Average Gross Accumulated Net Patents 10 394 (220) 174 Customer relationships 18 36,402 (17,190) 19,212 Trademarks and trade names 16 7,820 (4,428) 3,392 Technology 13 35,841 (24,581) 11,260 $ 80,457 $ (46,419) $ 34,038 December 31, 2020 Weighted Average Gross Accumulated Net Patents 10 383 (206) 177 Customer relationships 18 36,269 (15,914) 20,355 Trademarks and trade names 16 7,809 (4,135) 3,674 Technology 13 35,815 (23,124) 12,691 $ 80,276 $ (43,379) $ 36,897
Estimated Future Amortization	As of June 30, 2021, estimated amortization expense for the remainder of 2021 and thereafter was as follows: Amortization Expense Remainder of 2021 $ 2,925 2022 5,786 2023 5,315 2024 4,324 2025 2,462 2026 and thereafter 13,226 $ 34,038

Accounts Receivable (Tables)

Accounts Receivable (Tables)	6 Months Ended
	Jun. 30, 2021
Accounts Receivable Additional Disclosures [Abstract]
Accounts Receivable, Allowance for Credit Loss	The following table sets forth the Company’s allowance for credit losses: Allowance for Credit Losses Balance as of December 31, 2020 $ 944 Current period provision 18 Write-off against allowance (182) Balance as of June 30, 2021 $ 780

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories as of June 30, 2021 and December 31, 2020 are summarized in the following table: June 30, December 31, Finished goods $ 47,474 $ 60,766 Contract assets 40,496 37,843 Work-in-process 4,527 5,143 Raw materials 21,739 12,708 Inventories - net $ 114,236 $ 116,460

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant, and equipment as of June 30, 2021 and December 31, 2020 consisted of the following: June 30, December 31, Land $ 6,636 $ 6,627 Improvements to land and leaseholds 17,771 17,573 Buildings 27,598 27,348 Machinery and equipment, including equipment under finance leases 118,060 116,175 Construction in progress 1,325 915 Gross property, plant, and equipment 171,390 168,638 Less accumulated depreciation and amortization, including accumulated amortization of finance leases (110,864) (106,553) Property, plant, and equipment - net $ 60,526 $ 62,085

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Balance Sheet Locations	The balance sheet components of the Company’s leases were as follows as of June 30, 2021 and December 31, 2020: June 30, December 31, 2020 Operating leases Operating lease right-of-use assets $ 15,010 $ 16,069 Other accrued liabilities $ 2,528 $ 2,553 Long-term operating lease liabilities 12,482 13,516 Total operating lease liabilities $ 15,010 $ 16,069 Finance leases Property, plant, and equipment $ 1,163 $ 1,116 Accumulated amortization (943) (869) Property, plant, and equipment - net $ 220 $ 247 Current maturities of long-term debt $ 124 $ 119 Long-term debt 96 128 Total finance lease liabilities $ 220 $ 247
Components of Lease Cost	The components of lease expense within the Company’s Condensed Consolidated Statements of Operations were as follows for the three and six months ended June 30, 2021 and 2020: Three Months Ended Six Months Ended 2021 2020 2021 2020 Finance lease cost: Amortization of finance leases $ 51 $ 175 $ 102 $ 352 Interest on lease liabilities 20 18 42 36 Operating lease cost 694 748 1,336 1,546 Sublease income (50) (50) (100) (67) Total lease cost $ 715 $ 891 $ 1,380 $ 1,867 The cash flow components of the Company’s leases were as follows for the three and six months ended June 30, 2021 and 2020: Six Months Ended 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows related to operating leases $ (1,630) $ (1,965) Financing cash flows related to finance leases (111) (352) Right-of-use assets obtained in exchange for new lease liabilities: Operating leases $ 279 $ 6,435 The weighted-average remaining lease term (in years) and discount rate related to the operating leases were as follows as of the dates presented: June 30, 2021 2020 Operating lease weighted-average remaining lease term 7 8 Operating lease weighted-average discount rate 5.2 % 5.2 % Finance lease weighted-average remaining lease term 1 2 Finance lease weighted-average discount rate 4.2 % 4.2 %
Lessee, Operating Lease, Liability, Maturity	As of June 30, 2021, estimated annual maturities of lease liabilities remaining for the year ending December 31, 2021 and thereafter were as follows: Operating Leases Finance Leases Remainder of 2021 $ 1,676 $ 91 2022 2,991 115 2023 2,667 42 2024 2,589 11 2025 2,386 — 2026 and thereafter 5,383 — Total undiscounted lease payments 17,692 259 Interest (2,682) (39) Total $ 15,010 $ 220
Finance Lease, Liability, Maturity	As of June 30, 2021, estimated annual maturities of lease liabilities remaining for the year ending December 31, 2021 and thereafter were as follows: Operating Leases Finance Leases Remainder of 2021 $ 1,676 $ 91 2022 2,991 115 2023 2,667 42 2024 2,589 11 2025 2,386 — 2026 and thereafter 5,383 — Total undiscounted lease payments 17,692 259 Interest (2,682) (39) Total $ 15,010 $ 220

Long-term Debt and Related Ma_2

Long-term Debt and Related Matters (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt consisted of the following: June 30, December 31, Revolving credit facility $ 37,025 $ 44,777 Finance leases and financing agreements 220 247 Total 37,245 45,024 Less current maturities (124) (119) Long-term portion $ 37,121 $ 44,905

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings (loss) per common share for the periods indicated: Three Months Ended Six Months Ended 2021 2020 2021 2020 Numerator for basic and diluted loss per common share: Income from continuing operations $ 2,854 $ 6,970 $ 1,584 $ 6,965 Loss from discontinued operations — (6,447) — (8,308) Net income (loss) $ 2,854 $ 523 $ 1,584 $ (1,343) Denominator: Weighted average shares outstanding 10,619 10,557 10,601 10,518 Denominator for basic income (loss) per common share 10,619 10,557 10,601 10,518 Effect of dilutive securities: Stock compensation plans 115 66 128 — Dilutive potential common shares 115 66 128 — Denominator for diluted income (loss) per common share - adjusted weighted average shares outstanding 10,734 10,623 10,729 10,518 Continuing operations $ 0.27 $ 0.66 $ 0.15 $ 0.66 Discontinued operations — (0.61) — (0.79) Basic income (loss) per common share $ 0.27 $ 0.05 $ 0.15 $ (0.13) Continuing operations $ 0.27 $ 0.66 $ 0.15 $ 0.66 Discontinued operations — (0.61) — (0.79) Diluted income (loss) per common share $ 0.27 $ 0.05 $ 0.15 $ (0.13)

Stock-based Compensation (Table

Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Nonvested Share Activity	The following table summarizes the restricted stock awards, deferred stock units, and performance share units activity for the six months ended June 30, 2021: Restricted Deferred Performance Weighted Average Outstanding as of December 31, 2020 171,934 66,136 150,022 $ 18.05 Granted 108,300 8,814 141,471 16.13 Vested (98,234) — (7,940) 19.08 Adjustment for incentive awards expected to vest — — (55,743) 17.87 Outstanding as of June 30, 2021 182,000 74,950 227,810 $ 17.77

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Fair Value Measurements at Reporting Date Fair Value Measurements at Reporting Date June 30, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs December 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Term deposits $ 18 $ 18 $ — $ — $ 18 $ 18 $ — $ — Total assets $ 18 $ 18 $ — $ — $ 18 $ 18 $ — $ — Interest rate swaps $ 635 $ — $ 635 $ — $ 1,097 $ — $ 1,097 $ — Total liabilities $ 635 $ — $ 635 $ — $ 1,097 $ — $ 1,097 $ —

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Defined Benefit Plan Disclosure
Schedule of Costs of Retirement Plans	The following table summarizes the expense associated with the contributions made to these plans for the periods presented: Three Months Ended Six Months Ended 2021 2020 2021 2020 United States $ 408 $ 433 $ 772 $ 295 Canada 40 30 86 69 United Kingdom 135 101 255 210 $ 583 $ 564 $ 1,113 $ 574
United States
Defined Benefit Plan Disclosure
Schedule of Net Benefit Costs	Net periodic pension costs for the United States defined benefit pension plan for the three and six months ended June 30, 2021 and 2020 were as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Interest cost $ 43 $ 56 $ 86 $ 112 Expected return on plan assets (62) (58) (124) (115) Recognized net actuarial loss 25 13 49 27 Net periodic pension cost $ 6 $ 11 $ 11 $ 24
United Kingdom
Defined Benefit Plan Disclosure
Schedule of Net Benefit Costs	Net periodic pension costs for the United Kingdom defined benefit pension plan for the three and six months ended June 30, 2021 and 2020 were as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Interest cost $ 28 $ 43 $ 56 $ 86 Expected return on plan assets (65) (58) (130) (116) Amortization of prior service costs and transition amount 7 6 14 12 Recognized net actuarial loss 83 63 166 126 Net periodic pension cost $ 53 $ 54 $ 106 $ 108

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Product Warranty Liability	The following table sets forth the Company’s product warranty accrual: Warranty Liability Balance as of December 31, 2020 $ 1,249 Additions to warranty liability 226 Warranty liability utilized (518) Balance as of June 30, 2021 $ 957
Schedule Of Future Payments Of Legal Settlements	The expected payments under the UPRR Settlement Agreement for the remainder of the year ending December 31, 2021 and thereafter are as follows: Year Ending December 31, Remainder of 2021 $ 6,000 2022 8,000 2023 8,000 2024 8,000 Total $ 30,000
Environmental Loss Contingencies	The following table sets forth the Company’s environmental obligation: Environmental liability Balance as of December 31, 2020 $ 2,562 Environmental obligations utilized (38) Balance as of June 30, 2021 $ 2,524

Business Segments - Reconciliat

Business Segments - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information
Total net sales	$ 154,522	$ 141,563	$ 270,602	$ 263,470
Operating Segments
Segment Reporting Information
Total net sales	154,522	141,563	270,602	263,470
Segment Profit	8,310	10,672	10,176	13,448
Rail Technologies and Services | Operating Segments
Segment Reporting Information
Total net sales	88,782	74,939	155,014	145,143
Segment Profit	5,963	5,816	8,495	6,987
Infrastructure Solutions
Segment Reporting Information
Total net sales	65,740	66,624	115,588	118,327
Infrastructure Solutions | Operating Segments
Segment Reporting Information
Total net sales	65,740	66,624	115,588	118,327
Segment Profit	$ 2,347	$ 4,856	$ 1,681	$ 6,461

Business Segments - Reconcili_2

Business Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Other (expense) income - net	$ (70)	$ 2,306	$ (129)	$ 1,700
Income from continuing operations before income taxes	3,993	9,072	2,402	9,009
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit for reportable segments	8,310	10,672	10,176	13,448
Interest expense - net	(861)	(1,089)	(1,732)	(1,901)
Other (expense) income - net	256	2,292	197	2,421
Unallocated corporate expenses and other unallocated charges	(3,712)	(2,803)	(6,239)	(4,959)
Income from continuing operations before income taxes	$ 3,993	$ 9,072	$ 2,402	$ 9,009

Business Segments - Reconcili_3

Business Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information
Assets	$ 379,941	$ 370,395
Operating Segments | Rail Technologies and Services
Segment Reporting Information
Assets	176,863	161,485
Operating Segments | Infrastructure Solutions
Segment Reporting Information
Assets	137,433	137,519
Unallocated corporate assets
Segment Reporting Information
Assets	$ 65,645	$ 71,391

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands	Sep. 04, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations		$ 0	$ 6,447	$ 0	$ 8,308
Test and Inspection Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	$ 4,000
Loss from discontinued operations	$ (10,034)

Discontinued Operations - Net S

Discontinued Operations - Net Sales and Losses from Discontinued Operations (Details) - USD ($) $ in Thousands	Sep. 04, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before income taxes		$ 0	$ (7,456)	$ 0	$ (10,087)
Income tax benefit from discontinued operations		0	(1,009)	0	(1,779)
Loss from discontinued operations		$ 0	(6,447)	$ 0	(8,308)
Test and Inspection Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations	$ 10,034
Test and Inspection Services | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales			4,203		11,071
Loss from discontinued operations before income taxes			(7,456)		(10,087)
Income tax benefit from discontinued operations			(1,009)		(1,779)
Loss from discontinued operations			$ (6,447)		$ (8,308)

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue
Revenue recognized	$ 154,522	$ 141,563	$ 270,602	$ 263,470
Contract with customer, assets	40,496		40,496		$ 37,843
Contract with customer, liability	6,098		6,098		$ 1,324
Contract assets transferred to receivables			18,049
Cash proceeds from liability contract			5,524
Revenue recognized from contract liability	$ 228	$ 1,237	$ 904	$ 3,851
Over time
Disaggregation of Revenue
Customer revenue transferred (percentage)	27.90%	25.10%	26.80%	25.90%
Revenue recognized	$ 43,174	$ 35,546	$ 72,546	$ 68,323
Over time | Performance Based
Disaggregation of Revenue
Revenue recognized	27,687	24,858	48,795	49,290
Over time | Delivery Based
Disaggregation of Revenue
Revenue recognized	$ 15,487	$ 10,688	$ 23,751	$ 19,033
Point in time
Disaggregation of Revenue
Customer revenue transferred (percentage)	72.10%	74.90%	73.20%	74.10%
Revenue recognized	$ 111,348	$ 106,017	$ 198,056	$ 195,147

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Total net sales	$ 154,522	$ 141,563	$ 270,602	$ 263,470
Rail Technologies and Services
Disaggregation of Revenue
Total net sales	88,782	74,939	155,014	145,143
Rail Technologies and Services | Rail Products
Disaggregation of Revenue
Total net sales	64,565	56,500	108,375	104,399
Rail Technologies and Services | Rail Technologies
Disaggregation of Revenue
Total net sales	24,217	18,439	46,639	40,744
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	65,740	66,624	115,588	118,327
Infrastructure Solutions | Fabricated Steel Products
Disaggregation of Revenue
Total net sales	32,223	25,580	59,944	43,971
Infrastructure Solutions | Precast Concrete Products
Disaggregation of Revenue
Total net sales	20,073	16,428	32,751	27,071
Infrastructure Solutions | Coatings and Measurement
Disaggregation of Revenue
Total net sales	$ 13,444	$ 24,616	$ 22,893	$ 47,285

Revenue - Timing of Transfer (D

Revenue - Timing of Transfer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Total net sales	$ 154,522	$ 141,563	$ 270,602	$ 263,470
Point in time
Disaggregation of Revenue
Total net sales	111,348	106,017	198,056	195,147
Over time
Disaggregation of Revenue
Total net sales	43,174	35,546	72,546	68,323
Rail Technologies and Services
Disaggregation of Revenue
Total net sales	88,782	74,939	155,014	145,143
Rail Technologies and Services | Point in time
Disaggregation of Revenue
Total net sales	71,711	61,275	123,755	116,163
Rail Technologies and Services | Over time
Disaggregation of Revenue
Total net sales	17,071	13,664	31,259	28,980
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	65,740	66,624	115,588	118,327
Infrastructure Solutions | Point in time
Disaggregation of Revenue
Total net sales	39,637	44,742	74,301	78,984
Infrastructure Solutions | Over time
Disaggregation of Revenue
Total net sales	$ 26,103	$ 21,882	$ 41,287	$ 39,343

Revenue - Remaining Performance

Revenue - Remaining Performance Obligation (Details) $ in Thousands	Jun. 30, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Revenue remaining performance obligation	$ 253,231
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue remaining performance obligation	$ 253,231
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue remaining performance obligation (percentage)	10.80%
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill
Goodwill, beginning balance	$ 20,340
Foreign currency translation impact	88
Goodwill, ending balance	20,428
Rail Technologies and Services
Goodwill
Goodwill, beginning balance	14,743
Foreign currency translation impact	88
Goodwill, ending balance	14,831
Infrastructure Solutions
Goodwill
Goodwill, beginning balance	5,597
Foreign currency translation impact	0
Goodwill, ending balance	$ 5,597

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Intangible Asset (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross Carrying Value		$ 80,457	$ 80,276
Accumulated Amortization		(46,419)	(43,379)
Net Carrying Amount		34,038	36,897
Patents
Finite-Lived Intangible Assets
Gross Carrying Value		394	383
Accumulated Amortization		(220)	(206)
Net Carrying Amount		174	177
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Value		36,402	36,269
Accumulated Amortization		(17,190)	(15,914)
Net Carrying Amount		19,212	20,355
Trademarks and trade names
Finite-Lived Intangible Assets
Gross Carrying Value		7,820	7,809
Accumulated Amortization		(4,428)	(4,135)
Net Carrying Amount		3,392	3,674
Technology
Finite-Lived Intangible Assets
Gross Carrying Value		35,841	35,815
Accumulated Amortization		(24,581)	(23,124)
Net Carrying Amount		$ 11,260	$ 12,691
Weighted Average
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years		16 years
Weighted Average | Patents
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	10 years	10 years
Weighted Average | Customer relationships
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	18 years	18 years
Weighted Average | Trademarks and trade names
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	16 years	16 years
Weighted Average | Technology
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	13 years	13 years

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets
Amortization expense	$ 1,470	$ 1,413	$ 2,935	$ 2,843
Minimum
Finite-Lived Intangible Assets
Finite lived intangible asset, useful life			5 years
Maximum
Finite-Lived Intangible Assets
Finite lived intangible asset, useful life			25 years
Weighted Average
Finite-Lived Intangible Assets
Finite lived intangible asset, useful life			16 years

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Expected Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 2,925
2022	5,786
2023	5,315
2024	4,324
2025	2,462
2026 and thereafter	13,226
Net Carrying Amount	$ 34,038	$ 36,897

Accounts Receivable - Narrative

Accounts Receivable - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance doubtful accounts, receivables	$ 780		$ 780		$ 944
Current period provision			$ 18	$ 307
Selling, General and Administrative Expenses
Financing Receivable, Allowance for Credit Loss [Line Items]
Current period provision	$ 40	$ 221

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Allowance for Doubtful Accounts
Allowance for doubtful accounts, beginning balance	$ 944
Current period provision	18	$ 307
Write-off against allowance	(182)
Allowance for doubtful accounts, ending balance	$ 780

Inventory - Schedule of Invento

Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Finished goods	$ 47,474	$ 60,766
Contract assets	40,496	37,843
Work-in-process	4,527	5,143
Raw materials	21,739	12,708
Inventories - net	$ 114,236	$ 116,460

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment
Gross property, plant, and equipment	$ 171,390,000		$ 171,390,000		$ 168,638,000
Less accumulated depreciation and amortization, including accumulated amortization of finance leases	(110,864,000)		(110,864,000)		(106,553,000)
Property, plant, and equipment - net	60,526,000		60,526,000		62,085,000
Depreciation	2,018,000	$ 1,963,000	4,008,000	$ 3,898,000
Impairments of property, plant, and equipment			0	$ 0
Land
Property, Plant and Equipment
Gross property, plant, and equipment	6,636,000		6,636,000		6,627,000
Improvements to land and leaseholds
Property, Plant and Equipment
Gross property, plant, and equipment	17,771,000		17,771,000		17,573,000
Buildings
Property, Plant and Equipment
Gross property, plant, and equipment	27,598,000		27,598,000		27,348,000
Machinery and equipment, including equipment under finance leases
Property, Plant and Equipment
Gross property, plant, and equipment	118,060,000		118,060,000		116,175,000
Construction in progress
Property, Plant and Equipment
Gross property, plant, and equipment	$ 1,325,000		$ 1,325,000		$ 915,000

Leases - Narrative (Details)

Leases - Narrative (Details)	6 Months Ended
	Jun. 30, 2021
Lessee, Lease, Description
Lease renewal term	12 years
Lease termination period	1 year
Minimum
Lessee, Lease, Description
Lease term	2 years
Maximum
Lessee, Lease, Description
Lease term	12 years

Leases - Balance Sheet Location

Leases - Balance Sheet Location (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating leases
Operating lease right of use assets	$ 15,010	$ 16,069
Other accrued liabilities	2,528	2,553
Long-term operating lease liabilities	12,482	13,516
Total operating lease liabilities	15,010	16,069
Finance leases
Property, plant, and equipment	1,163	1,116
Accumulated amortization	(943)	(869)
Property, plant, and equipment - net	220	247
Current maturities of long-term debt	124	119
Long-term debt	96	128
Total finance lease liabilities	$ 220	$ 247
Operating lease, liability, current, statement of financial position	Other accrued liabilities	Other accrued liabilities
Finance lease, right-of-use asset, statement of financial position	Property, plant, and equipment - net (Note 8)	Property, plant, and equipment - net (Note 8)
Finance lease, liability, current, statement of financial position	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance lease, liability, noncurrent, statement of financial position	Long-term portion	Long-term portion

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost:
Amortization of finance leases	$ 51	$ 175	$ 102	$ 352
Interest on lease liabilities	20	18	42	36
Operating lease cost	694	748	1,336	1,546
Sublease income	(50)	(50)	(100)	(67)
Total lease cost	$ 715	$ 891	$ 1,380	$ 1,867

Leases - Cash Flow Components (

Leases - Cash Flow Components (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows related to operating leases	$ (1,630)	$ (1,965)
Financing cash flows related to finance leases	(111)	(352)
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	$ 279	$ 6,435

Leases - Weighted Average Lease

Leases - Weighted Average Lease Term and Discount Rate (Details)	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease weighted-average remaining lease term	7 years	8 years
Operating lease weighted-average discount rate	5.20%	5.20%
Finance lease weighted-average remaining lease term	1 year	2 years
Finance lease weighted-average discount rate	4.20%	4.20%

Leases - Estimated Annual Matur

Leases - Estimated Annual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating Leases
Remainder of 2021	$ 1,676
2022	2,991
2023	2,667
2024	2,589
2025	2,386
2026 and thereafter	5,383
Total undiscounted lease payments	17,692
Interest	(2,682)
Total	15,010	$ 16,069
Finance Leases
Remainder of 2021	91
2022	115
2023	42
2024	11
2025	0
2026 and thereafter	0
Total undiscounted lease payments	259
Interest	(39)
Total	$ 220	$ 247

Long-term Debt and Related Ma_3

Long-term Debt and Related Matters - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Revolving credit facility	$ 37,025	$ 44,777
Finance leases and financing agreements	220	247
Total	37,245	45,024
Less current maturities	(124)	(119)
Long-term portion	$ 37,121	$ 44,905

Long-term Debt and Related Ma_4

Long-term Debt and Related Matters - Narrative (Details)	Jun. 26, 2020USD ($)	Jun. 30, 2021USD ($)	Jan. 29, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 25, 2020USD ($)
Line of Credit Facility
Line of credit facility, amount outstanding		$ 37,025,000		$ 44,777,000
Second Amendment
Line of Credit Facility
Minimum aggregate indebtedness			$ 3,000,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company
Line of Credit Facility
Line of credit, covenants, basket for dispositions					$ 25,000,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment
Line of Credit Facility
Revolving facility usage	1.50
Line of credit, covenants, basket for dispositions	$ 40,000,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Inventories
Line of Credit Facility
Minimum working capital to revolving facility usage ratio	0.50
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Accounts Receivable
Line of Credit Facility
Minimum working capital to revolving facility usage ratio	0.85
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period One
Line of Credit Facility
Minimum leverage ratio	3.25
Maximum liquidity ratio required	3.50
Minimum interest coverage ratio	1
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Two
Line of Credit Facility
Minimum leverage ratio	3
Maximum liquidity ratio required	3.25
Minimum interest coverage ratio	1.05
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Three
Line of Credit Facility
Minimum leverage ratio	2.75
Maximum liquidity ratio required	3
Minimum interest coverage ratio	1.15
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | First Amendment | Debt Instrument, Redemption, Period Four
Line of Credit Facility
Minimum interest coverage ratio	1.25
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Overnight Bank Funding Rate | First Amendment
Line of Credit Facility
Debt instrument, basis spread on variable rate	0.50%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment | Minimum
Line of Credit Facility
Debt instrument, basis spread on variable rate	2.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | First Amendment | Maximum
Line of Credit Facility
Debt instrument, basis spread on variable rate	3.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment | Minimum
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | First Amendment | Maximum
Line of Credit Facility
Debt instrument, basis spread on variable rate	2.00%
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving credit facility
Line of Credit Facility
Line of credit facility, amount outstanding		497,000
Potential increase to borrowing capacity	$ 50,000,000
Liquidity covenant	25,000,000
Acquisition consideration threshold, per acquisition	50,000,000
Aggregate acquisition threshold for four consecutive periods where acquisitions occurred	50,000,000
Aggregate acquisition consideration threshold	100,000,000
Line of credit facility, current borrowing capacity		$ 77,478,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving credit facility | First Amendment
Line of Credit Facility
Line of credit facility, maximum borrowing capacity	140,000,000
Line of credit facility, accordion feature, decrease limit	120,000,000
Line of credit, accordion feature, lower borrowing capacity option	25,000,000			$ 5,000,000
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Secured debt | First Amendment
Line of Credit Facility
Debt instrument, face amount	25,000,000
Line of credit facility, amount outstanding	$ 22,500,000

Earning Per Common Share - Sche

Earning Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator for basic and diluted loss per common share:
Income from continuing operations	$ 2,854	$ 6,970	$ 1,584	$ 6,965
Loss from discontinued operations	0	(6,447)	0	(8,308)
Net income (loss)	$ 2,854	$ 523	$ 1,584	$ (1,343)
Denominator:
Weighted average shares outstanding (in shares)	10,619,000	10,557,000	10,601,000	10,518,000
Denominator for basic income (loss) per common share (in shares)	10,619,000	10,557,000	10,601,000	10,518,000
Effect of dilutive securities:
Stock compensation plans (in shares)	115,000	66,000	128,000	0
Dilutive potential common shares (in shares)	115,000	66,000	128,000	0
Denominator for diluted income (loss) per common share - adjusted weighted average shares outstanding (in shares)	10,734,000	10,623,000	10,729,000	10,518,000
Continuing operations (usd per share)	$ 0.27	$ 0.66	$ 0.15	$ 0.66
Discontinued operations (usd per share)	0	(0.61)	0	(0.79)
Basic income (loss) per common share (usd per share)	0.27	0.05	0.15	(0.13)
Continuing operations (usd per share)	0.27	0.66	0.15	0.66
Discontinued operations (usd per share)	0	(0.61)	0	(0.79)
Diluted income (loss) per common share (usd per share)	$ 0.27	$ 0.05	$ 0.15	$ (0.13)
Anti-dilutive shares (in shares)	0	0	0	131,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense from continuing operations	$ 1,139	$ 2,102	$ 818	$ 2,044
Income before income taxes from continuing operations	$ 3,993	$ 9,072	$ 2,402	$ 9,009
Effective income tax rate (percent)	28.50%	23.20%	34.10%	22.70%

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation				$ 1,213	$ 1,238
Expected cost on shares expected to vest		$ 5,138		$ 5,138
Recognition period for compensation expense not yet recognized				3 years 8 months 12 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation		386	$ 558
Restricted Stock | Vesting period one
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period				3 years
Restricted Stock | Vesting period two | Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period				1 year
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation		$ 386	$ 558
Vesting period				3 years
Performance Share Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	5 years
Stock price threshold, period	30 days

Stock-based Compensation - Rest

Stock-based Compensation - Restricted Stock and Performance Share Units (Details)	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Weighted Average Grant Date Fair Value
Outstanding, Beginning balance (usd per share) | $ / shares	$ 18.05
Granted (usd per share) | $ / shares	16.13
Vested (usd per share) | $ / shares	19.08
Adjustment for incentive awards expected to vest (usd per share) | $ / shares	17.87
Outstanding, Ending balance (usd per share) | $ / shares	$ 17.77
Restricted Stock
Restricted Stock, Deferred Stock Units and Performance Share Units
Outstanding, Beginning balance (in shares)	171,934
Granted (in shares)	108,300
Vested (in shares)	(98,234)
Adjustment for incentive awards expected to vest (in shares)	0
Outstanding, Ending balance (in shares)	182,000
Deferred Stock Units
Restricted Stock, Deferred Stock Units and Performance Share Units
Outstanding, Beginning balance (in shares)	66,136
Granted (in shares)	8,814
Vested (in shares)	0
Adjustment for incentive awards expected to vest (in shares)	0
Outstanding, Ending balance (in shares)	74,950
Performance Share Units
Restricted Stock, Deferred Stock Units and Performance Share Units
Outstanding, Beginning balance (in shares)	150,022
Granted (in shares)	141,471
Vested (in shares)	(7,940)
Adjustment for incentive awards expected to vest (in shares)	(55,743)
Outstanding, Ending balance (in shares)	227,810

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - Swap - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative, notional amount	$ 50,000,000		$ 50,000,000
Investment expense	$ 245,000	$ 217,000	$ 480,000
Investment Income, Interest				$ 290,000

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term deposits	$ 18	$ 18
Total assets	18	18
Interest rate swaps	635	1,097
Total liabilities	635	1,097
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term deposits	18	18
Total assets	18	18
Interest rate swaps	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term deposits	0	0
Total assets	0	0
Interest rate swaps	635	1,097
Total liabilities	635	1,097
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term deposits	0	0
Total assets	0	0
Interest rate swaps	0	0
Total liabilities	$ 0	$ 0

Retirement Plans - Narrative (D

Retirement Plans - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)plan
Defined Benefit Plan Disclosure
Defined contribution plan number	6
United States
Defined Benefit Plan Disclosure
Number of retirement plans	3
Number of defined benefit plans	1
Defined contribution plan number	2
Defined benefit plan, contributions by employer | $	$ 300
Defined benefit plan, expected future employer contributions, current fiscal year | $	$ 450
Canada
Defined Benefit Plan Disclosure
Defined contribution plan number	2
Number of post-retirement benefit plan	1
United Kingdom
Defined Benefit Plan Disclosure
Defined contribution plan number	2
Defined benefit plan, contributions by employer | $	$ 171
Defined benefit plan, expected future employer contributions, current fiscal year | $	$ 342

Retirement Plans - Schedule Of

Retirement Plans - Schedule Of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
United States
Defined Benefit Plan Disclosure
Interest cost	$ 43	$ 56	$ 86	$ 112
Expected return on plan assets	(62)	(58)	(124)	(115)
Recognized net actuarial loss	25	13	49	27
Net periodic pension cost	6	11	11	24
United Kingdom
Defined Benefit Plan Disclosure
Interest cost	28	43	56	86
Expected return on plan assets	(65)	(58)	(130)	(116)
Amortization of prior service costs and transition amount	7	6	14	12
Recognized net actuarial loss	83	63	166	126
Net periodic pension cost	$ 53	$ 54	$ 106	$ 108

Retirement Plans - Schedule o_2

Retirement Plans - Schedule of Costs of Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Contribution Plan Disclosure
Expenses associated with contributions made	$ 583	$ 564	$ 1,113	$ 574
United States
Defined Contribution Plan Disclosure
Expenses associated with contributions made	408	433	772	295
Canada
Defined Contribution Plan Disclosure
Expenses associated with contributions made	40	30	86	69
United Kingdom
Defined Contribution Plan Disclosure
Expenses associated with contributions made	$ 135	$ 101	$ 255	$ 210

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Schedule of Product Warranty Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Warranty Liability
Beginning balance	$ 1,249
Additions to warranty liability	226
Warranty liability utilized	(518)
Ending balance	$ 957

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Narrative (Details) $ in Thousands	Mar. 13, 2019USD ($)	Jun. 30, 2021USD ($)company	Dec. 31, 2020USD ($)	Jun. 05, 2017company
Product Liability Contingency
Litigation settlement amount		$ 30,000
Number of companies that received a general notice letter (company) | company				140
Present value of remedial work		1,100,000
Undiscovered remedial work		$ 1,700,000
Anticipated clean period		13 years
Number of potentially responsible parties included in agreement | company		100
Accrual for environmental loss		$ 2,524	$ 2,562
UPRR
Product Liability Contingency
Annual commitment amount	$ 8,000
UPRR
Product Liability Contingency
Litigation settlement amount	50,000
Litigation settlement amount, current	2,000
Litigation settlement amount, non-current	$ 48,000
Payment period	6 years

Commitments and Contingent Li_5

Commitments and Contingent Liabilities - Future Payments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2021	$ 6,000
2022	8,000
2023	8,000
2024	8,000
Total	$ 30,000

Commitments and Contingent Li_6

Commitments and Contingent Liabilities - Environmental Loss Contingencies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Accrual for Environmental Loss Contingencies
Environmental liability, beginning balance	$ 2,562
Environmental obligations utilized	(38)
Environmental liability, ending balance	$ 2,524