Orion (ORN) 10-K 16 Mar 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 09, 2023	Jun. 30, 2022
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
Entity File Number	1-33891
Entity Registrant Name	ORION GROUP HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-0097459
Entity Address, Address Line One	12000 Aerospace Avenue, Suite 300
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77034
City Area Code	713
Local Phone Number	852-6500
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	ORN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 71.3
Entity Common Stock, Shares Outstanding		32,167,799
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0001402829
Amendment Flag	false
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Houston, Texas

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 3,784	$ 12,293
Accounts receivable:
Trade, net of allowance for credit losses of $606 and $323, respectively	106,758	88,173
Retainage	50,873	41,379
Income taxes receivable	402	405
Other current	3,526	17,585
Inventory	2,862	1,428
Contract assets	43,903	28,529
Prepaid expenses and other	8,229	8,142
Total current assets	220,337	197,934
Property and equipment, net of depreciation	100,977	106,654
Operating lease right-of-use assets, net of amortization	14,978	14,686
Financing lease right-of-use assets, net of amortization	15,839	14,561
Inventory, non-current	5,469	5,418
Intangible assets, net of amortization	7,317	8,556
Deferred income tax asset	70	41
Other non-current	2,168	3,900
Total assets	367,155	351,750
Current liabilities:
Current debt, net of debt issuance costs	34,956	39,141
Accounts payable:
Trade	87,605	48,217
Retainage	1,198	923
Accrued liabilities	18,466	38,594
Income taxes payable	522	601
Contract liabilities	37,720	26,998
Current portion of operating lease liabilities	4,738	3,857
Current portion of financing lease liabilities	4,031	3,406
Total current liabilities	189,236	161,737
Long-term debt, net of debt issuance costs	716	259
Operating lease liabilities	11,018	11,637
Financing lease liabilities	11,102	10,908
Other long-term liabilities	17,072	18,942
Deferred income tax liability	211	169
Total liabilities	229,355	203,652
Stockholders' equity:
Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued
Common stock -- $0.01 par value, 50,000,000 authorized, 32,770,550 and 31,712,457 issued; 32,059,319 and 31,001,226 outstanding at December 31, 2022 and December 31, 2021, respectively	328	317
Treasury stock, 711,231 shares, at cost, as of December 31, 2022 and December 31, 2021, respectively	(6,540)	(6,540)
Additional paid-in capital	188,184	185,881
Retained loss	(44,172)	(31,560)
Total stockholders' equity	137,800	148,098
Total liabilities and stockholders' equity	$ 367,155	$ 351,750

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Allowance for credit losses	$ 606	$ 323
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	32,770,550	31,712,457
Common stock, shares outstanding	32,059,319	31,001,226
Treasury stock, shares (in shares)	711,231	711,231

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Costs of contract revenues	697,580	560,393	625,239
Gross profit	50,742	40,967	84,703
Selling, general and administrative expenses	62,503	60,181	65,091
Amortization of intangible assets	1,239	1,521	2,070
Gain on disposal of assets, net	(4,970)	(11,418)	(9,044)
Operating income (loss)	(8,030)	(9,317)	26,586
Other (expense) income:
Other income	199	199	347
Interest income	104	136	183
Interest expense	(4,456)	(5,076)	(4,920)
Other expense, net	(4,153)	(4,741)	(4,390)
Income (loss) income before income taxes	(12,183)	(14,058)	22,196
Income tax (benefit) expense	429	502	1,976
Net income (loss)	$ (12,612)	$ (14,560)	$ 20,220
Basic income (loss) per share (in dollars per share)	$ (0.40)	$ (0.47)	$ 0.67
Diluted income (loss) per share (in dollars per share)	$ (0.40)	$ (0.47)	$ 0.67
Shares used to compute income (loss) per share:
Basic (in shares)	31,402,328	30,763,527	30,122,362
Diluted (in shares)	31,402,328	30,763,527	30,122,362

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (12,612)	$ (14,560)	$ 20,220
Change in fair value of cash flow hedge, net of tax expense of $368 and tax benefit of $128 for the years ended December 31, 2021 and 2020, respectively		1,234	(429)
Total comprehensive income (loss)	$ (12,612)	$ (13,326)	$ 19,791

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income (Loss) [Abstract]
Change in fair value of cash flow hedge, tax expense (benefit)	$ 368	$ (128)

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Other Comprehensive Income (Loss)	Additional Paid-In Capital	Retained Earnings	Total
Beginning balance, shares at Dec. 31, 2019	30,303,395
Beginning treasury stock, shares at Dec. 31, 2019		(711,231)
Beginning balance at Dec. 31, 2019	$ 303	$ (6,540)	$ (1,045)	$ 182,523	$ (37,220)	$ 138,021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				1,998		1,998
Issuance of restricted stock, shares	1,038,044
Issuance of restricted stock	$ 10			(10)
Forfeiture of restricted stock, shares	(107,383)
Payments related to tax withholding for stock-based compensation, shares	(62,252)
Payments related to tax withholding for stock-based compensation	$ (1)			(187)		(188)
Cash flow hedge			(557)			(557)
Net income (loss)					20,220	20,220
Ending balance, shares at Dec. 31, 2020	31,171,804
Ending treasury stock, shares at Dec. 31, 2020		(711,231)
Ending balance at Dec. 31, 2020	$ 312	$ (6,540)	(1,602)	184,324	(17,000)	159,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				2,401		$ 2,401
Exercise of stock options, shares	28,546					28,546
Exercise of stock options				110		$ 110
Issuance of restricted stock, shares	916,531
Issuance of restricted stock	$ 9			(9)
Forfeiture of restricted stock, shares	(234,232)
Forfeiture of restricted stock	$ (2)			2
Payments related to tax withholding for stock-based compensation, shares	(170,192)
Payments related to tax withholding for stock-based compensation	$ (2)			(947)		(949)
Cash flow hedge			$ 1,602			1,602
Net income (loss)					(14,560)	$ (14,560)
Ending balance, shares at Dec. 31, 2021	31,712,457					31,712,457
Ending treasury stock, shares at Dec. 31, 2021		(711,231)				(711,231)
Ending balance at Dec. 31, 2021	$ 317	$ (6,540)		185,881	(31,560)	$ 148,098
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation				2,754		2,754
Issuance of restricted stock, shares	1,603,434
Issuance of restricted stock	$ 16			(16)
Forfeiture of restricted stock, shares	(382,480)
Forfeiture of restricted stock	$ (4)			4
Payments related to tax withholding for stock-based compensation, shares	(162,861)
Payments related to tax withholding for stock-based compensation	$ (1)			(439)		(440)
Net income (loss)					(12,612)	$ (12,612)
Ending balance, shares at Dec. 31, 2022	32,770,550					32,770,550
Ending treasury stock, shares at Dec. 31, 2022		(711,231)				(711,231)
Ending balance at Dec. 31, 2022	$ 328	$ (6,540)		$ 188,184	$ (44,172)	$ 137,800

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net (loss) income	$ (12,612)	$ (14,560)	$ 20,220
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	20,915	22,608	23,893
Amortization of ROU operating leases	4,813	5,102	5,874
Amortization of ROU finance leases	3,142	2,822	3,324
Write-off of debt issuance costs upon debt modification		790
Amortization of deferred debt issuance costs	424	430	763
Deferred income taxes	13	(9)	17
Stock-based compensation	2,754	2,401	1,998
Gain on disposal of assets, net	(4,970)	(11,418)	(6,185)
Gain on involuntary disposition of assets, net			(2,859)
Allowance for credit losses	322		(487)
Change in operating assets and liabilities:
Accounts receivable	(28,660)	4,703	23,587
Income tax receivable	3	14	543
Inventory	(1,485)	371	148
Prepaid expenses and other	1,645	143	(1,070)
Contract assets	(15,374)	3,742	9,118
Accounts payable	39,370	589	(22,015)
Accrued liabilities	(6,630)	(6,544)	11,092
Operating lease liabilities	(4,748)	(4,940)	(5,399)
Income tax payable	(79)	(38)	(884)
Contract liabilities	10,722	(6,137)	(15,646)
Net cash provided by operating activities	9,565	69	46,032
Cash flows from investing activities:
Proceeds from sale of property and equipment	4,880	27,164	5,944
Purchase of property and equipment	(14,584)	(16,975)	(14,694)
Contributions to CSV life insurance			(99)
Insurance claim proceeds related to property and equipment		440	5,720
Net cash (used in) provided by investing activities	(9,704)	10,629	(3,129)
Cash flows from financing activities:
Borrowings on credit	24,000	53,000	10,000
Payments made on borrowings of credit	(28,274)	(49,120)	(48,204)
Loan costs from Credit Facility	(664)		(389)
Payments of finance lease liabilities	(2,992)	(3,035)	(3,619)
Payments related to tax withholding for stock-based compensation	(440)	(949)	(188)
Exercise of stock options		110
Net cash (used in) provided by financing activities	(8,370)	6	(42,400)
Net change in cash, cash equivalents and restricted cash	(8,509)	10,704	503
Cash, cash equivalents and restricted cash at beginning of period	12,293	1,589	1,086
Cash, cash equivalents and restricted cash at end of period	3,784	12,293	1,589
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	2,923	2,423	3,187
Taxes, net of refunds	$ 533	$ 568	$ 2,174

Description of Business and Bas

Description of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	1. Description of Business Orion Group Holdings, Inc., its subsidiaries and affiliates (hereafter collectively referred to as the “Company”), provide a broad range of specialty construction services in the infrastructure, industrial, and building sectors of the continental United States, Alaska, Canada and the Caribbean Basin. The Company’s marine segment services the infrastructure sector through marine transportation facility construction, marine pipeline construction, marine environmental structures, dredging of waterways, channels and ports, environmental dredging, design, and specialty services. Its concrete segment services the building sector by providing turnkey concrete construction services including place and finish, site preparation, layout, forming, and rebar placement for large commercial, structural and other associated business areas. The Company is headquartered in Houston, Texas with offices throughout its operating areas. The tools used by the chief operating decision maker (“CODM”) to allocate resources and assess performance are based on two reportable and operating segments: marine, which operates under the Orion brand and logo, and concrete, which operates under the TAS Commercial Concrete brand and logo. Although we describe the business in this report in terms of the services the Company provides, its base of customers and the areas in which it operates, the Company has determined that its operations currently comprise two reportable segments pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 280, Segment Reporting In making this determination, the Company considered the similar economic characteristics of its operations that comprise its marine segment. For the marine segment, the methods used, and the internal processes employed, to deliver marine construction services are similar throughout the segment, including standardized estimating, project controls and project management. This segment has the same customers with similar funding drivers and are subject to similar regulatory regimes driven through Federal agencies such as the U.S. Army Corps of Engineers, U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency and U.S. Occupational Safety and Health Administration (“OSHA”), among others. Additionally, the segment is driven by macro-economic considerations including the level of import/export seaborne transportation, development of energy-related infrastructure, cruise line expansion and operations, marine bridge infrastructure development, waterway pipeline crossings and the maintenance of waterways. These considerations, and others, are key catalysts for future prospects and are similar across the segment. For the concrete segment, the Company also considered the similar economic characteristics of these operations. The methods used, and the internal processes employed, to deliver concrete construction services are similar throughout the segment, including standardized estimating, project controls and project management. The projects of this segment are subject to similar regulatory regimes such as OSHA. Additionally, this segment is driven by macro-economic considerations, including movements in population, commercial real estate development, institutional funding and expansion, and recreational development, specifically in metropolitan areas of Texas. These considerations, and others, are key catalysts for current operations and future prospects and are similar across the segment. Basis of Presentation These consolidated financial statements include the accounts of the parent company, Orion Group Holdings, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with U.S. GAAP on the going concern basis of accounting, which assumes the Company will continue to operate as a going concern and which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. All intercompany balances and transactions have been eliminated in consolidation. ​ In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable that a company will be unable to meet its obligations as they become due within one year after the date that the consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date that the financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued; and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Generally, to be considered probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued. The Company has sustained operating losses for the years ended December 31, 2022 and 2021. The assessment of the liquidity and going concern requires the Company to make estimates of future activity and judgments about whether the Company is compliant with financial covenant calculations under its debt and other agreements and has adequate liquidity to operate. Significant assumptions used in the Company's forecasted model of liquidity include forecasted sales, costs, and capital expenditures; expected timing and proceeds of planned real estate transactions. Also as described in Note 11, the Company had $35.0 million of outstanding indebtedness under its Credit Facility as of December 31, 2022 which matures on July 31, 2023. As of the date of these financial statements, the Company’s existing cash and cash equivalents are not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of these financial statements. ​ To alleviate these conditions, the Company is engaged in a syndication process to refinance the outstanding debt. Based on the advanced nature of our discussions, the completion of substantial due diligence by potential lenders, agreement among the parties on key terms of a new credit facility, and the expected timeline for documentation and execution of a new credit agreement, Management believes it will successfully complete a refinancing transaction prior to the maturity of the current credit facility. Additionally, the Company is exploring sales of underutilized assets as a source of liquidity. ​ The Company’s ability to continue as a going concern is dependent upon obtaining sufficient liquidity to repay its existing credit facility through a combination of proceeds from new debt, proceeds from the sale of underutilized assets, and operating cash flow. As the Company’s refinancing activities are ongoing, there can be no assurances that the Company will be able to secure financing on terms that are acceptable to the Company or at all. ​ These conditions raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. While management has developed and is in process to implement plans that management believes could alleviate in the future the substantial doubt that was raised, management concluded at the date of the issuance of the financial statements that substantial doubt exists as those plans are not within the control of management. The Company’s consolidated financial statements do not include adjustments, if any, that may arise from the outcome of this uncertainty. ​ There is an explanatory paragraph included in the report of the Company’s independent registered public accounting firm describing the uncertainty about the Company’s ability to continue as a going concern, which is considered an event of noncompliance under the Company’s Credit Facility. Management has obtained a consent with respect to the delivery of annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders, and the Company is compliant with the financial covenants of the credit agreement.

Summary of Significant Accounti

Summary of Significant Accounting Principles	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Principles	2. The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Management’s estimates, judgments and assumptions are continually evaluated based on available information and experience; however, actual amounts could differ from those estimates. On an ongoing basis, the Company evaluates the significant accounting policies used to prepare its consolidated financial statements, including, but not limited to, those related to: ● Revenue recognition from construction contracts; ● The recording of accounts receivable and allowance for credit losses; ● The carrying value of property, plant and equipment; ● Leases; ● Finite and infinite-lived intangible assets, testing for indicators of impairment; ● Stock-based compensation; ● Income taxes; and ● Self-insurance. Revenue Recognition The Company’s revenue is derived from contracts to provide marine construction, dredging, turnkey concrete services, and other specialty services. The Company’s projects are typically brief in duration, but occasionally, span a period of over one year. The Company determines the appropriate accounting treatment for each contract before work begins and, subject to qualifications discussed in the next paragraph, generally records contract revenue over time. Performance obligations are promises in a contract to transfer distinct goods or services to the customer and are the unit of account under Topic 606. Each of the Company’s contracts and related change orders typically represent a single performance obligation because the Company provides an integrated service and individual goods and services are not separately identifiable. Revenue is recognized over time because control of the promised goods and services are continuously transferred to the customer over the life of the contract. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using its best estimate of the stand-alone selling price of each distinct good or service. Progress is measured by the percentage of actual contract costs incurred to date to total estimated costs for each contract. This method is used because management considers contract costs incurred to be the best available measure of progress on these contracts. Contract costs include all direct costs, such as material and labor, and those indirect costs incurred that are related to contract performance such as payroll taxes and insurance. General and administrative costs are charged to expense as incurred. Upfront costs, such as costs to mobilize personnel and equipment prior to satisfying a performance obligation are capitalized and amortized over the contract performance period. Changes in job performance, job conditions and estimated profitability, including those arising from final contract settlements, may result in revisions to costs and reported revenue and are recognized in the period in which the revisions are determined. The effect of changes in estimates of contract revenue or contract costs is recognized as an adjustment to recognized revenue on a cumulative catch-up basis. When the Company anticipates a loss on a contract that is not yet complete, it recognizes the entire loss in the period in which such losses are determined. Revenue is recorded net of any sales taxes collected and paid on behalf of the customer, if applicable. Contract revenue is derived from the original contract price as modified by agreed-upon change orders and estimates of variable consideration related to incentive fees and change orders or claims for which price has not yet been agreed by the customer. The Company estimates variable consideration based on its assessment of the most likely amount to which it expects to be entitled. Variable consideration is included in the estimated recognition of revenue to the extent it is probable that a significant reversal of cumulative recognized revenue will not occur. A determination that the collection of a claim is probable is based upon compliance with the terms of the contract and the extent to which the Company performed in accordance therewith but does not guarantee collection in full. Assets and liabilities derived from contracts with customers include the following: ● Accounts Receivable: Trade, net of allowance - Represent amounts billed and currently due from customers and are stated at their estimated net realizable value. ● Accounts Receivable: Retainage - Represent amounts which have not been billed to or paid by customers due to retainage provisions in construction contracts, which amounts generally become payable upon contract completion and acceptance by the customer. ● Contract Assets - Represent revenues recognized in excess of amounts billed, which management believes will be billed and collected within one year of the completion of the contract and are recorded as a current asset, until such amounts are either received or written off. ● Contract Liabilities - Represent billings in excess of revenues recognized and are recorded as a current liability, until the underlying obligation has been performed or discharged. ​ Classification of Current Assets and Liabilities The Company includes in current assets and liabilities amounts realizable and payable in the normal course of contract completion. Cash and Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. At times, cash held by financial institutions may exceed federally insured limits. The Company has not historically sustained losses on its cash balances in excess of federally insured limits. Cash equivalents at December 31, 2022 and December 31, 2021 consisted primarily of overnight bank deposits. Risk Concentrations Financial instruments that potentially subject the Company to concentrations of credit risk principally consist of accounts receivable. The Company depends on its ability to continue to obtain federal, state and local governmental contracts, and indirectly, on the amount of funding available to these agencies for new and current governmental projects. Therefore, a portion of the Company’s operations is dependent upon the level and timing of government funding. Statutory mechanics liens provide the Company high priority in the event of lien foreclosures following financial difficulties of private owners, thus minimizing credit risk with private customers. Accounts Receivable Accounts receivable are stated at the historical carrying value, net of allowances for credit losses. The Company had significant investments in billed and unbilled receivables as of December 31, 2022 and December 31, 2021. Billed receivables represent amounts billed upon the completion of small contracts and progress billings on large contracts in accordance with contract terms and milestone achievements. Unbilled receivables on contracts represent recoverable costs and accrued profits that are not yet capable of being billed under the terms of the applicable contracts. Revenue associated with these billings is recorded net of any sales tax, if applicable. Past due balances over 90 days and other higher risk receivables identified by management are reviewed individually for collectability. In establishing an allowance for credit losses, the Company evaluates its contract receivables and contract assets and thoroughly reviews historical collection experience, the financial condition of its customers, billing disputes and other factors. The Company writes off potentially uncollectible accounts receivable against the allowance for credit losses if it is determined that the amounts will not be collected or if a settlement with respect to a disputed receivable is reached for an amount that is less than the carrying value. As of December 31, 2022 and December 31, 2021, the Company had recorded an allowance for credit losses of $0.6 million and $0.3 million, respectively. Balances billed to customers but not paid pursuant to retainage provisions in construction contracts generally become payable upon contract completion and acceptance by the owner. Retainage at December 31, 2022 totaled $50.9 million, of which $4.9 million is expected to be collected beyond December 31, 2023. Retainage at December 31, 2021 totaled $41.4 million. From time to time, the Company negotiates change orders and claims with its customers. Unsuccessful negotiations of claims could result in a change to contract revenue that is less than amounts previously recorded, which could result in the recording of a loss in the amount of the shortfall. Successful claims negotiations could result in the recovery of previously recorded losses. Significant losses on receivables could adversely affect the Company’s financial position, results of operations and overall liquidity. Advertising Costs The Company primarily obtains contracts through the open bid process, and therefore advertising costs are not a significant component of expense. Advertising costs are expensed as incurred. Environmental Costs Costs related to environmental remediation are charged to expense. Other environmental costs are also charged to expense unless they increase the value of the property and/or provide future economic benefits, in which event the costs are capitalized. Environmental liabilities, if any, are recognized when the liability is considered probable and the amount can be reasonably estimated. The Company did not recognize any environmental liabilities as of December 31, 2022 or December 31, 2021. Fair Value Measurements The Company evaluates and presents certain amounts included in the accompanying consolidated financial statements at “fair value” in accordance with U.S. GAAP, which requires the Company to base its estimates on assumptions that market participants, in an orderly transaction, would use to price an asset or liability, and to establish a hierarchy that prioritizes the information used to determine fair value. Refer to Note 8 The Company generally applies fair value valuation techniques on a non-recurring basis associated with (1) valuing assets and liabilities acquired in connection with business combinations and other transactions; (2) valuing potential impairment loss related to long-lived assets; and (3) valuing potential impairment loss related to goodwill and indefinite-lived intangible assets. Inventory Current inventory consists of parts and small equipment held for use in the ordinary course of business and is valued at the lower of cost (using historical average cost) or net realizable value. Where shipping and handling costs are incurred by the Company, these charges are included in inventory and charged to cost of contract revenue upon use. Non-current inventory consists of spare parts (including engines, cutters and gears) that require special order or long-lead times for manufacture or fabrication, but must be kept on hand to reduce downtime and is valued at the lower of cost (using historical average cost) or net realizable value. Property and Equipment Property and equipment are recorded at cost. Ordinary maintenance and repairs that do not improve or extend the useful life of the asset are expensed as incurred. Major renewals and betterments of equipment are capitalized and depreciated generally over three When property and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in results of operations for the respective period. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets for financial statement purposes, as follows: ​ ​ ​ ​ Automobiles and trucks 3 to 10 years Buildings and improvements 10 to 30 years Construction equipment 3 to 10 years Vessels and other equipment 3 to 40 years Office equipment 3 to 5 years ​ The Company generally uses accelerated depreciation methods for tax purposes where beneficial. Dry-docking costs are capitalized and amortized using the straight-line method over a period ranging from three determine if the estimates are accurate. If warranted, a significant upgrade of equipment may result in a revision to the useful life of the asset, in which case the change is accounted for prospectively. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset or asset group may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or the fair value, less the costs to sell, and are no longer depreciated. There was $0.8 million of assets classified as held for sale as of December 31, 2022 included in prepaid expenses and other in the Company’s Consolidated Balance Sheets. There was no assets classified as held for sale as of December 31, 2021. Leases Management determines if a contract is or contains a lease at inception of the contract or modification of the contract. A contract is or contains a lease if the contract conveys the right to control the use of an identified asset for a period in exchange for consideration. Control over the use of the identified asset means the lessee has both (a) the right to obtain substantially all of the economic benefits from the use of the asset and (b) the right to direct the use of the asset. Finance and operating lease right-of-use (“ROU”) assets and liabilities are recognized based on the present value of future minimum lease payments over the expected lease term at commencement date. As the implicit rate is not determinable in most of the Company’s leases, management uses the Company’s incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The expected lease term includes options to extend or terminate the lease when it is reasonably certain the Company will exercise such option. Lease expense for minimum lease payments is recognized on a straight-line basis over the expected lease term. The Company’s lease arrangements have lease and non-lease components. Leases with an expected term of 12 months or less are not accounted for on the balance sheet and the related lease expense is recognized on a straight-line basis over the expected lease term. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. See Note 19 Intangible Assets Intangible assets that have finite lives are amortized. In addition, the Company evaluates the remaining useful life of intangible assets in each reporting period to determine whether events and circumstances warrant a revision of the remaining period of amortization. If the estimate of an intangible asset’s remaining life is changed, the remaining carrying value of such asset is amortized prospectively over that revised remaining useful life. Intangible assets that have infinite lives are not amortized, but are subject to impairment testing at least annually or more frequently if events or circumstances indicate that the asset may be impaired. The Company has one infinite-lived intangible asset, a trade name, which it tests for impairment annually on October 31, or whenever events or circumstances indicate that the carrying amount of the trade name may not be recoverable. Impairment is calculated as the excess of the trade name’s carrying value over its fair value. The fair value of the trade name is determined using the relief from royalty method, a variation of the income approach. This method assumes that if a company owns intellectual property, it does not have to “rent” the asset and is, therefore, “relieved” from paying a royalty. Once a supportable royalty rate is determined, the rate is then applied to the projected revenues over the expected remaining life of the intangible assets to estimate the royalty savings. This approach is dependent on a number of factors, including estimates of future growth and trends, royalty rates, discount rates and other variables. See Note 9 Stock-Based Compensation The Company recognizes compensation expense for equity awards over the vesting period based on the fair value of these awards at the date of grant. The computed fair value of these awards is recognized as a non-cash cost over the period the employee provides services, which is typically the vesting period of the award. The fair value of restricted stock grants and restricted stock units is equivalent to the fair value of the stock issued on the date of grant and is measured as the closing price of the stock on the date of grant. Compensation expense is recognized only for stock-based payments expected to vest. The Company estimates forfeitures at the date of grant based on historical experience and future expectations. This assessment is updated on a periodic basis. See Note 15 Income Taxes The Company determines its consolidated income tax provision using the asset and liability method prescribed by U.S. GAAP, which requires the recognition of income tax expense for the amount of taxes payable or refundable for the current period and for deferred tax liabilities and assets for the future tax consequences of events that have been recognized in an entity’s financial statements or tax returns. The Company must make significant assumptions, judgments and estimates to determine its current provision for income taxes, its deferred tax assets and liabilities, and any valuation allowance to be recorded against any deferred tax asset. The current provision for income tax is based upon the current tax laws and the Company’s interpretation of these laws, as well as the probable outcomes of any tax audits. The value of any net deferred tax asset depends upon estimates of the amount and category of future taxable income reduced by the amount of any tax benefits that the Company does not expect to realize. Actual operating results and the underlying amount and category of income in future years could render current assumptions, judgments and estimates of recoverable net deferred taxes inaccurate, thus impacting the Company’s financial position and results of operations. The Company computes deferred income taxes using the liability method. Under the liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Under the liability method, the effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company accounts for uncertain tax positions in accordance with the provisions of ASC 740, Income Taxes ​ See Note 13 Insurance Coverage The Company maintains insurance coverage for its business and operations. Insurance related to property, equipment, automobile, general liability, and a portion of workers’ compensation is provided through traditional policies, subject to a deductible or deductibles. A portion of the Company’s workers’ compensation exposure is covered through a mutual association, which is subject to supplemental calls. The marine segment maintains five levels of excess loss insurance coverage, totaling $200 million in excess of primary coverage. The marine segment’s excess loss coverage responds to most of its policies when a primary limit of $1 million has been exhausted; provided that the primary limit for Contingent Maritime Employer’s Liability is $10 million and the Watercraft Pollution Policy primary limit is $5 million. The concrete segment maintains five levels of excess loss insurance coverage, totaling $200 million in excess of primary coverage. The concrete segment’s excess loss coverage responds to most of its policies when a primary limit of $1 million has been exhausted. If a claim arises and a potential insurance recovery is probable, the impending gain is recognized separately from the related loss. The recovery will only be recognized up to the amount of the loss once the recovery of the claim is deemed probable and any excess gain will fall under contingency accounting and will only be recognized once it is realized. The Company does not net insurance recoveries against the related claim liability as the amount of the claim liability is determined without consideration of the anticipated insurance recoveries from third parties. Separately, the Company’s marine segment employee health care is paid for by general assets of the Company and currently administered by a third party. The administrator has purchased appropriate stop-loss coverage. Losses on these policies up to the deductible amounts are accrued based upon known claims incurred and an estimate of claims incurred but not reported. The accruals are derived from known facts, historical trends and industry averages to determine the best estimate of the ultimate expected loss. Actual claims may vary from estimates. Any adjustments to such reserves are included in the Consolidated Statements of Operations in the period in which they become known. The Company’s concrete segment employee health care is provided through two policies. A fully funded policy is offered primarily to salaried employees and their dependents while a partially self-funded plan with an appropriate stop-loss is offered primarily to hourly employees and their dependents. The self-funded plan is funded to the maximum exposure and, as a result, is expected to receive a partial refund after the policy expiration. The total accrual for insurance claims liabilities was $5.8 million and $19.8 million at December 31, 2022 and December 31, 2021, respectively, reflected as a component of accrued liabilities in the consolidated balance sheet. The total accrual for insurance claims receivable was none and $13.3 million at December 31, 2022 and December 31, 2021, respectively, reflected as a component of other current accounts receivable in the consolidated balance sheet .

Revenue

Revenue	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	3. Contract revenues are recognized when control of the promised goods or services is transferred to the customer in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The following table represents a disaggregation of the Company’s contract revenues by service line for the marine and concrete segments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2022 2021 2020 Marine Segment ​ ​ ​ Construction ​ $ 239,656 ​ $ 169,554 ​ $ 272,870 Dredging ​ 85,414 ​ 80,831 ​ 106,647 Specialty Services ​ 14,143 ​ 13,530 ​ 8,656 Marine segment contract revenues ​ $ 339,213 ​ $ 263,915 ​ $ 388,173 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Concrete Segment ​ ​ ​ Structural ​ $ 57,425 ​ $ 58,420 ​ $ 85,904 Light Commercial ​ 351,684 ​ 279,018 ​ 235,835 Other ​ — ​ 7 ​ 30 Concrete segment contract revenues ​ $ 409,109 ​ $ 337,445 ​ $ 321,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total contract revenues ​ $ 748,322 ​ $ 601,360 ​ $ 709,942 ​ The Company has determined that it has two reportable segments pursuant to FASB ASC Topic 280, Segment Reporting Note 1 Marine Segment Construction services include construction, restoration, maintenance, dredging and repair of marine transportation facilities, marine pipelines, bridges and causeways and marine environmental structures. Dredging services generally enhance or preserve the navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Specialty services include design, salvage, demolition, surveying, towing, diving and underwater inspection, excavation and repair. Concrete Segment Structural services include elevated concrete pouring for products such as columns, elevated beams and structural walls. Light commercial services include horizontally poured concrete for products such as slabs, sidewalks, ramps and tilt walls. Other services comprise labor related to concrete pouring such as rebar installation and pumping services and typically support the Company’s structural and light commercial services.

Concentration of Risk and Enter

Concentration of Risk and Enterprise-Wide Disclosures	12 Months Ended
	Dec. 31, 2022
Risks and Uncertainties [Abstract]
Concentration of Risk and Enterprise Wide Disclosures	4. In both reportable segments accounts receivable include amounts billed to governmental agencies and private customers and do not bear interest. Balances billed to customers but not paid pursuant to retainage provisions generally become payable upon contract completion and acceptance by the owner. ​ The table below presents the concentrations of current receivables (trade and retainage) at December 31, 2022 and December 31, 2021, respectively: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ December 31, 2021 Federal Government $ 4,612 3 % $ 6,563 5 % State Governments ​ 3,111 2 % 61 - % Local Governments ​ 16,197 10 % 11,923 9 % Private Companies ​ 134,317 85 % 111,328 86 % Gross receivables ​ ​ 158,237 ​ 100 % ​ 129,875 ​ 100 % Allowance for credit losses ​ ​ (606) ​ ​ ​ ​ (323) ​ ​ ​ Net receivables ​ $ 157,631 ​ ​ $ 129,552 ​ ​ ​ At December 31, 2022 and 2021, no single customer accounted for more than 10.0% of total current receivables. Additionally, the table below represents concentrations of contract revenue by type of customer for the years ended December 31, 2022, 2021 and 2020. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 % 2021 % 2020 % Federal Government $ 80,116 11 % $ 54,480 9 % $ 51,793 7 % State Governments 62,516 8 % 4,790 1 % 27,574 4 % Local Government 125,015 17 % 120,311 20 % 202,839 29 % Private Companies 480,675 64 % 421,779 70 % 427,736 60 % Total contract revenues $ 748,322 100 % $ 601,360 100 % $ 709,942 100 % ​ In the year ended December 31, 2020 one customer in the Local Governments category accounted for 11.4% of total contract revenues. In the years ended December 31, 2022 and 2021, no single customer exceeded 10.0% of total contract revenues. The Company does not believe that the loss of any one of its customers would have a material adverse effect on the Company or its subsidiaries and affiliates since no single specific customer sustains such a large portion of receivables or contract revenue over time. The concrete segment primarily purchases concrete from select suppliers. The loss of any one of these suppliers could adversely impact short-term operations. Contract revenues generated outside the United States totaled 0.9%, 0.5% and 1.8% of total revenues for the years ended December 31, 2022, 2021 and 2020, respectively, and were primarily located in the Caribbean Basin and Mexico.

Contracts in Progress

Contracts in Progress	12 Months Ended
	Dec. 31, 2022
Contractors [Abstract]
Contracts in Progress	​ ​ 5. Contracts in progress are as follows as of December 31, 2022 and December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Costs incurred on uncompleted contracts ​ $ 1,251,853 ​ $ 1,138,298 Estimated earnings ​ 180,705 ​ 168,861 ​ ​ 1,432,558 ​ 1,307,159 Less: Billings to date ​ (1,426,375) ​ (1,305,628) ​ ​ $ 6,183 ​ $ 1,531 Included in the accompanying Consolidated Balance Sheets under the following captions: ​ ​ Contract assets ​ $ 43,903 ​ $ 28,529 Contract liabilities ​ (37,720) ​ (26,998) ​ ​ $ 6,183 ​ $ 1,531 ​ Included in contract assets is approximately $13.4 million and $3.8 million at December 31, 2022 and December 31, 2021, respectively, related to claims and unapproved change orders. See Note 2 Remaining performance obligations represent the transaction price of firm orders or other written contractual commitments from customers for which work has not been performed or is partially completed and excludes unexercised contract options and potential orders. As of December 31, 2022, the aggregate amount of the remaining performance obligations was approximately $448.8 million. Of this amount, the current expectation of the Company is that it will recognize $396.2 million, or 88%, in the next 12 months and the remaining balance thereafter.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment	6. The following is a summary of property and equipment as of December 31, 2022 and December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Automobiles and trucks ​ $ 2,232 ​ $ 2,337 Building and improvements ​ 36,952 ​ 34,796 Construction equipment ​ 130,660 ​ 137,786 Vessels and other equipment ​ 91,495 ​ 82,455 Office equipment ​ 6,885 ​ 6,430 ​ ​ 268,224 ​ 263,804 Less: Accumulated depreciation ​ (195,948) ​ (191,542) Net book value of depreciable assets ​ 72,276 ​ 72,262 Construction in progress ​ 816 ​ 6,507 Land ​ 27,885 ​ 27,885 ​ ​ $ 100,977 ​ $ 106,654 ​ During the year ended December 31, 2021 the Company sold its land, building and improvements located in Tampa, Florida. The book value of the assets and related accumulated depreciation have been removed from the balance sheet and the Company recognized a net gain on the sale of $6.7 million. For the years ended December 31, 2022, 2021 and 2020, depreciation expense was $19.7 million, $21.1. million and $21.8. million, respectively. Substantially all depreciation expense is included in the cost of contract revenue in the Company’s Consolidated Statements of Operations. Substantially all of the assets of the Company are pledged as collateral under the Company’s Credit Agreement (as defined in Note 11 Substantially all of the Company’s long-lived assets are located in the United States. See Note 2

Other Current Accounts Receivab

Other Current Accounts Receivable	12 Months Ended
	Dec. 31, 2022
Other Current Accounts Receivable
Other Current Accounts Receivable	7. Other current accounts receivable at December 31, 2022 and 2021 consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Insurance claims receivable ​ $ — ​ $ 13,273 Accident loss receivables ​ 1,328 ​ 3,760 Vendor receivables ​ ​ 807 ​ ​ 118 Purchase incentive receivable ​ ​ 695 ​ ​ — Bond premium dividend receivable ​ ​ 391 ​ ​ 385 Other current accounts receivable ​ ​ 305 ​ ​ 49 Total other current accounts receivable ​ $ 3,526 ​ $ 17,585 ​

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value	8. Recurring Fair Value Measurements The fair value of financial instruments is the amount at which the instrument could be exchanged in a current transaction between willing parties. Due to their short-term nature, the Company believes that the carrying value of its accounts receivable, other current assets, accounts payable and other current liabilities approximate their fair values. The Company classifies financial assets and liabilities into the following three levels based on the inputs used to measure fair value in the order of priority indicated: ● Level 1- fair values are based on observable inputs such as quoted prices in active markets for identical assets or liabilities; ● Level 2 - fair values are based on pricing inputs other than quoted prices in active markets for identical assets and liabilities and are either directly or indirectly observable as of the measurement date; and ● Level 3- fair values are based on unobservable inputs in which little or no market data exists. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value requires judgment and may affect the placement of assets and liabilities within the fair value hierarchy levels. The following table sets forth by level within the fair value hierarchy the Company’s recurring financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2022 and December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements ​ Carrying Value Level 1 Level 2 Level 3 December 31, 2022 ​ ​ ​ ​ ​ Assets: ​ Cash surrender value of life insurance policy ​ $ 1,811 — 1,811 — December 31, 2021 ​ ​ ​ ​ ​ Assets: ​ Cash surrender value of life insurance policy ​ $ 2,813 — 2,813 — ​ The Company’s derivatives, which are comprised of interest rate swaps, are valued using a discounted cash flow analysis that incorporates observable market parameters, such as interest rate yield curves and credit risk adjustments, that are necessary to reflect the probability of default by us or the counterparty. These derivatives are classified as a Level 2 measurement within the fair value hierarchy. See Note 11 Our concrete segment has life insurance policies with a combined face value of $11.1 million as of December 31, 2022. The policies are invested in mutual funds and the fair value measurement of the cash surrender balance associated with these policies is determined using Level 2 inputs within the fair value hierarchy and will vary with investment performance. These assets are included in the "Other noncurrent" asset section in the Company’s Consolidated Balance Sheets. Non-Recurring Fair Value Measurements The Company generally applies fair value valuation techniques on a non-recurring basis associated with (1) valuing assets and liabilities acquired in connection with business combinations and other transactions; (2) valuing potential impairment loss related to long-lived assets; and (3) valuing potential impairment loss related to the infinite-lived intangible asset. Other Fair Value Measurements The fair value of the Company’s debt at December 31, 2022 and 2021 approximated its carrying value of $35.7. million and $39.4 million, respectively, as interest is based on current market interest rates for debt with similar risk and maturity. If the Company’s debt was measured at fair value, it would have been classified as Level 2 in the fair value hierarchy.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	9. Intangible assets The tables below present the activity and amortizations of finite-lived intangible assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Finite-lived intangible assets, beginning of period ​ $ 35,240 ​ $ 35,240 Additions ​ — ​ — Total finite-lived intangible assets, end of period ​ $ 35,240 ​ $ 35,240 ​ ​ ​ ​ ​ ​ ​ Accumulated amortization, beginning of period ​ $ (33,576) ​ $ (32,055) Current year amortization ​ (1,239) ​ (1,521) Total accumulated amortization ​ (34,815) ​ (33,576) ​ ​ ​ ​ ​ ​ ​ Net finite-lived intangible assets, end of period ​ $ 425 ​ ​ 1,664 Infinite-lived intangible assets ​ ​ 6,892 ​ ​ 6,892 Total net intangible assets ​ $ 7,317 ​ $ 8,556 ​ Remaining net finite-lived intangible assets were acquired as part of the purchase of TAS during 2015 and TBC during 2017 and included customer relationships. Customer relationships were valued at approximately $18.8 million and are being amortized over eight years using an accelerated method based on the pattern in which the economic benefits of the assets are consumed. For the years ended December 31, 2022, 2021 and 2020, $1.2 million, $1.5 million and $2.1 million, respectively, of amortization expense was recognized for these assets. In 2022 and 2021, the Company evaluated the useful lives of these finite-lived intangible assets and no change was needed. Future expense remaining of approximately $0.4 million will be amortized as follows: ​ ​ ​ ​ ​ 2023 ​ 388 2024 ​ 37 ​ ​ $ 425 ​ The annual impairment test for both 2022 and 2021 concluded that the fair value of the Company’s infinite-lived trade name was in excess of the carrying value, therefore no impairment was recorded in each respective year.

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued Liabilities	​ ​ 10. Accrued liabilities as of December 31, 2022 and 2021 consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Accrued salaries, wages and benefits ​ $ 7,605 ​ $ 9,879 Accrued liabilities expected to be covered by insurance ​ 5,757 ​ 19,818 Sales taxes ​ 1,737 ​ 5,113 Property taxes ​ 522 ​ 1,047 Sale-leaseback arrangement ​ ​ 813 ​ ​ 743 Accounting and audit fees ​ ​ 222 ​ ​ 413 Interest ​ 60 ​ 23 Other accrued expenses ​ 1,750 ​ 1,558 Total accrued liabilities ​ $ 18,466 ​ $ 38,594 ​

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	11. The Company entered into an amended syndicated credit agreement (the “Credit Agreement” also known as the “Fourth Amendment”) on July 31, 2018 with Regions Bank, as administrative agent and collateral agent, and the following co-syndication agents: Bank of America, N.A., BOKF, NA dba Bank of Texas, KeyBank National Association, NBH Bank, IBERIABANK, Trustmark National Bank, First Tennessee Bank NA, and Branch Banking and Trust Company. The Credit Agreement was subsequently amended in March 2019 (the “Fifth Amendment”), May 2019 (the “Sixth Amendment”), June 2020 (the “Seventh Amendment”), October 2020 (the “Eighth Amendment”), and March 2022 (the “Ninth Amendment”). The Company incurred debt issuance costs related to the initial Credit Agreement and several of the subsequent amendments. The Credit Facility matures on July 31, 2023. The Credit Agreement, which may be amended from time to time, provides for borrowings under a revolving line of credit and a term loan (together, the “Credit Facility”). The Credit Facility is guaranteed by the subsidiaries of the Company, secured by the assets of the Company, including stock held in its subsidiaries, and may be used to finance general corporate and working capital purposes, to finance capital expenditures, to refinance existing indebtedness, to finance permitted acquisitions and associated fees, and to pay for all related expenses to the Credit Facility. Interest is due and is computed based on the designation of the loan, with the option of a Base Rate Loan (the base rate plus the Applicable Margin), or an Adjusted LIBOR Rate Loan (the adjusted LIBOR rate plus the Applicable Margin). Interest is due on the last day of each quarter end for Base Rate Loans and at the end of the LIBOR rate period for Adjusted LIBOR Rate Loans. Principal balances drawn under the Credit Facility may be prepaid at any time, in whole or in part, without premium or penalty. Amounts repaid under the revolving line of credit may be re-borrowed. Effective, March 1, 2022, the Company entered into the Ninth Amendment to the Credit Agreement to, among other things, waive certain covenant defaults, reset the revolver limit, implement an anti-cash hoarding provision and institute temporary covenant requirements. The amendment reduced the commitment on the revolving line of credit to $42.5 million. With the execution of the Ninth Amendment, the existing Credit Facility was treated as a modification of debt and accounted for under the guidelines of ASC 470-50, Debt, Modifications and Extinguishments. The new debt issuance costs of approximately $1.0 million, inclusive of appraisal and bank consulting fees, related to the execution of the Ninth Amendment will be amortized through the maturity date. The yearly weighted average interest rate for the Credit Facility as of December 31, 2022 was 6.23%. ​ The Company’s obligations under debt arrangements consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ December 31, 2021 ​ ​ Debt Issuance ​ ​ Debt Issuance ​ ​ ​ Principal ​ Costs (1) ​ Total ​ Principal ​ Costs (1) ​ Total Revolving line of credit ​ $ 35,000 ​ $ (327) ​ $ 34,673 ​ $ 39,000 ​ $ — ​ $ 39,000 Other debt ​ ​ 283 ​ ​ — ​ ​ 283 ​ ​ 141 ​ ​ — ​ ​ 141 Total current debt ​ 35,283 ​ (327) ​ 34,956 ​ 39,141 ​ — ​ 39,141 Other debt ​ ​ 716 ​ ​ — ​ ​ 716 ​ ​ 259 ​ ​ — ​ ​ 259 Total long-term debt ​ ​ 716 ​ ​ — ​ ​ 716 ​ ​ 259 ​ ​ — ​ ​ 259 Total debt ​ $ 35,999 ​ $ (327) ​ $ 35,672 ​ $ 39,400 ​ $ — ​ $ 39,400 (1) Total debt issuance costs, include underwriter fees, legal fees and syndication fees and fees related to the execution of the Ninth Amendment to the Credit Agreement. Provisions of the revolving line of credit The Company has a maximum borrowing availability under the revolving line of credit and swingline loans (as defined in the Credit Agreement) of $42.5 million. There is a letter of credit sublimit that is equal to the lesser of $20.0 million and the aggregate unused amount of the revolving commitments then in effect. There is also a swingline sublimit equal to the lesser of $5.0 million and the aggregate unused amount of the revolving commitments then in effect. Revolving loans may be designated as Base Rate Loan or Adjusted LIBOR Rate Loans, at the Company’s request, and must be drawn in an aggregate minimum amount of $1.0 million and integral multiples of $250,000 in excess of that amount. Swingline loans must be drawn in an aggregate minimum amount of $250,000 and integral multiples of $50,000 in excess of that amount. The Company may convert, change, or modify such designations from time to time. The Company is subject to a commitment fee for the unused portion of the maximum borrowing availability under the revolving line of credit. The commitment fee, which is due quarterly in arrears, is equal to the Applicable Margin of the actual daily amount by which the Aggregate Revolving Commitments exceeds the Total Revolving Outstanding. The revolving line of credit termination date is the earlier of the Credit Facility termination date, July 31, 2023, or the date the outstanding balance is permanently reduced to zero, in accordance with the terms of the amended Credit Facility. As of December 31, 2022, the Company had $35.0 million of borrowings under the revolving line of credit. There were $1.5 million in outstanding letters of credit as of December 31, 2022, which reduced the maximum borrowing availability on the revolving line of credit to $6.0 million. During the year ended December 31, 2022, the Company drew down $24.0 million for general corporate purposes and made payments of $28.0 million on the revolving line of credit which resulted in a net decrease of $4.0 million. Other debt The Company has entered into debt agreements with De Lage Landen Financial Services, Inc. and Mobilease for the purpose of financing equipment purchased. As of December 31, 2022, the carrying value of this debt was $1.0 million. The agreements are secured by the financed equipment assets and the debt is included as a component of current debt and long-term debt on the Consolidated Balance Sheets. Financial covenants Restrictive financial covenants under the Credit Facility include: • Consolidated Leverage Ratio - Fiscal Quarter Ending December 31, 2022 and each Fiscal Quarter thereafter, maximum of 3.00 to 1.00 • Consolidated Fixed Charge Coverage Ratio - Fiscal Quarter Ending December 31, 2022 and each Fiscal Quarter thereafter, minimum of 1.25 to 1.00. ​ In addition, the Credit Facility contains events of default that are usual and customary for similar arrangements, including non-payment of principal, interest or fees; breaches of representations and warranties that are not timely cured; violation of covenants; bankruptcy and insolvency events; and events constituting a change of control. The Company was in compliance with all financial covenants as of December 31, 2022, with the reported consolidated leverage ratio of 2.38 to 1.00 and the reported consolidated fixed charge coverage ratio of 1.76 to 1.00. ​ Management has obtained a consent with respect to the delivery of its annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders, and at the date of this filing is negotiating a new credit facility. ​

Other Long-Term Liabilities

Other Long-Term Liabilities	12 Months Ended
	Dec. 31, 2022
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]
Other Long-Term Liabilities	​ 12. ​ Other long-term liabilities at December 31, 2022 and 2021 consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Sale-leaseback arrangement ​ $ 15,156 ​ $ 15,969 Deferred compensation ​ 1,639 ​ 2,759 Accrued liabilities expected to be covered by insurance ​ ​ 277 ​ 214 Total other long-term liabilities ​ $ 17,072 ​ $ 18,942 ​ Sale-Leaseback Arrangement On September 27, 2019, the Company entered into a purchase and sale agreement (the “Purchase and Sale Agreement”). Pursuant to the terms of the Purchase and Sale Agreement, the Company sold its 17300 & 17140 Market Street location in Channelview, Texas (the “Property”) for a purchase price of $19.1 million. Concurrent with the sale of the Property, the Company entered into a fifteen-year lease agreement (the “Lease Agreement”), whereby the Company will lease back the Property at an annual rental rate of approximately $1.5 million, subject to annual rent increases of 2.0% . Under the Lease Agreement, the Company has two consecutive options to extend the term of the Lease by ten years for each such option. This transaction was recorded as a failed sale-leaseback. The Company recorded a liability for the amounts received, will continue to depreciate the non-land portion of the asset, and has imputed an interest rate so that the net carrying amount of the financial liability and remaining assets will be zero at the end of the initial lease term. Concurrently with the sale, the Company paid $18.2 million towards the Term loan portion of the Company’s Credit Facility, consistent with terms of the Sixth Amendment.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	​ ​ 13. The following table presents the components of our consolidated income tax expense for the years ended December 31, 2022, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current Deferred Total Year ended December 31, 2022 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 449 ​ $ (29) ​ ​ 420 Foreign ​ (34) ​ 43 ​ 9 ​ ​ $ 415 ​ $ 14 ​ $ 429 Year ended December 31, 2021 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 243 ​ ​ (20) ​ ​ 223 Foreign ​ 268 ​ 11 ​ 279 ​ ​ $ 511 ​ $ (9) ​ $ 502 Year ended December 31, 2020 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 589 ​ ​ 13 ​ ​ 602 Foreign ​ 1,370 ​ 4 ​ 1,374 ​ ​ $ 1,959 ​ $ 17 ​ $ 1,976 ​ The Company’s income tax provision reconciles to the provision at the statutory U.S. federal income tax rate for each year ended December 31, as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Statutory amount ​ $ (2,558) ​ $ (2,952) ​ $ 4,662 ​ Valuation allowance on foreign tax credits ​ (136) ​ 186 ​ 1,344 ​ State income tax, net of federal benefit ​ 251 ​ 44 ​ 792 ​ Permanent differences, other ​ 185 ​ 303 ​ 558 ​ Permanent differences, stock compensation ​ 217 ​ (262) ​ 328 ​ Valuation allowance, other ​ 2,251 ​ 3,108 ​ (5,795) ​ Other ​ 219 ​ 75 ​ 87 ​ Consolidated income tax provision ​ $ 429 ​ $ 502 ​ $ 1,976 ​ Consolidated effective tax rate ​ (3.5) % (3.6) % 8.9 % ​ In the year ended 2022, the Company’s effective tax rate differed from the statutory federal rate of 21% primarily due to the tax impact from the valuation allowance for current year activity, state income taxes and the non-deductibility of other permanent items. In the year ended 2021, the Company’s effective tax rate differed from the statutory federal rate of 21% primarily due to the valuation allowance related to the current year net loss. In the year ended 2020, the Company’s effective tax rate differed from the statutory federal rate of 21% primarily due to the movement in the valuation allowance for current year activity, state income taxes and the non-deductibility of other permanent items. ​ Deferred Taxes The Company’s deferred tax assets and liabilities are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Long Term ​ ​ As of December 31, ​ 2022 2021 Assets related to: ​ ​ Accrued liabilities ​ $ 1,320 ​ $ 1,568 Intangible assets ​ 2,161 ​ 2,510 Net operating loss carryforward ​ 16,699 ​ 11,966 Stock-based compensation ​ 276 ​ 326 Foreign tax credits ​ 3,831 ​ 3,968 Goodwill ​ 4,328 ​ 5,249 Leases ​ ​ 9,018 ​ ​ 8,772 Other ​ 2,301 ​ 2,040 Total gross deferred tax assets ​ 39,934 ​ 36,399 Less valuation allowance ​ ​ (17,557) ​ ​ (15,443) Total net deferred tax assets ​ ​ 22,377 ​ ​ 20,956 Liabilities related to: ​ ​ Depreciation and amortization ​ (22,362) ​ (20,700) Other ​ (156) ​ (384) Total deferred tax liabilities ​ (22,518) ​ (21,084) Net deferred tax liabilities ​ $ (141) ​ $ (128) ​ The Company has net operating loss carryforwards for federal income tax purposes of $51.3 million as of December 31, 2022, which are available to reduce future taxable income. The Company’s federal net operating losses arose after the 2017 tax year and can be carried forward for an indefinite period of time but are limited to offset 80% of taxable income in any given year. The Company has state net operating losses of $132.0 million that expire beginning in 2027. A portion of the state losses that arose after the 2017 tax year may be carried forward indefinitely. Additionally, the Company has foreign tax credits of $3.8 million that can be carried forward for up to ten years. The Company has foreign tax credits that will expire next year. The Company assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to realize the existing deferred tax assets. The Company considers the scheduled reversal of deferred tax liabilities, available carryback periods, and tax-planning strategies in making this assessment. According to ASC subtopic 740-10, the Company’s history of losses is a significant piece of objective evidence. This objective evidence is weighed more heavily than the Company’s subjective positive evidence such as our estimated future taxable income and growth. Therefore, as of December 31, 2022, the Company continues to maintain a valuation allowance of $17.6 million. This valuation allowance increased by $2.2 million during the year ended December 31, 2022 primarily to offset net operating losses generated during the current period. Uncertain Tax Benefits The Company and its subsidiaries file consolidated federal income tax returns in the United States and also file in various states and foreign jurisdictions. With few exceptions, the Company remains subject to federal and state income tax examinations for the years of 2013-2021. As of December 31, 2022, the Company has recorded unrecognized tax benefits of $1.6 million for any uncertain tax positions. The Company does not expect that unrecognized tax benefits as of December 31, 2022 for certain federal income tax matters will significantly change over the next 12 months. The final outcome of these uncertain tax positions is not yet determinable. ​ The change in the total gross unrecognized tax benefits and prior year audit resolutions of the Company during the years ended December 31, 2022 and 2021 are reconciled in the table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Balance at beginning of the year ​ $ 1,614 ​ $ 1,614 Additions based on tax position related to current year ​ — ​ — Additions based on tax positions related to prior years ​ — ​ — Reductions based on tax positions related to current year ​ — ​ — Reductions based on tax positions related to prior years ​ — ​ — Settlements with tax authorities ​ — ​ — Lapse of statute of limitations ​ — ​ — Balance at end of the year ​ $ 1,614 ​ $ 1,614 ​ The Company’s policy is to recognize interest and penalties related to any unrecognized tax liabilities as additional tax expense. No interest or penalties have been accrued at December 31, 2022, 2021 and 2020. The Company believes it has appropriate and adequate support for the income tax positions taken and to be taken on its tax returns and that its accruals for tax liabilities are adequate for all open years based on an assessment of many factors including past experience and interpretations of tax law applied to the facts of each matter. Although the Company believes its recorded assets and liabilities are reasonable, tax regulations are subject to interpretation and tax litigation is inherently uncertain; therefore the Company’s assessments can involve both a series of complex judgments about future events and rely heavily on estimates and assumptions. Although the Company believes that the estimates and assumptions supporting its assessments are reasonable, the final determination of tax audit settlements and any related litigation could be materially different from that which is reflected in historical income tax provisions and recorded assets and liabilities. If the Company were to settle an audit or a matter under litigation, it could have a material effect on the income tax provision, net income, or cash flows in the period or periods for which that determination is made. Any accruals for tax contingencies are provided for in accordance with U.S. GAAP . The Company does not believe that its tax positions will significantly change due to any settlement and/or expiration of statutes of limitations prior to December 31, 2023.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share	14. Basic earnings per share is based on the weighted average number of common shares outstanding during each period. Diluted earnings per share is based on the weighted average number of common shares outstanding as well as the effect of all dilutive common stock equivalents during each period net income is generated. For the years ended December 31, 2022, 2021 and 2020, the Company had 490,678, 831,077, and 1,159,440, securities, respectively, that were potentially dilutive in earnings per share calculations. Such dilution is dependent on the excess of the market price of our stock over the exercise price and other components of the treasury stock method. The exercise price for certain stock options awarded by the Company exceeded the average market price of the Company’s common stock for the years ended December 31, 2022, 2021 and 2020. Such stock options are antidilutive and are not included in the computation of earnings per share for those periods. The following table reconciles the denominators used in the computations of both basic and diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2022 2021 2020 Basic: Weighted average shares outstanding 31,402,328 30,763,527 30,122,362 Diluted: Total basic weighted average shares outstanding 31,402,328 30,763,527 30,122,362 Effect of potentially dilutive securities: Common stock options — — — Total weighted average shares outstanding assuming dilution 31,402,328 30,763,527 30,122,362 ​

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	​ ​ 15. The 2022 three Restricted Stock The following table summarizes the restricted stock activity under the Company’s equity incentive plans: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number ​ Average ​ ​ of ​ Fair Value ​ ​ Shares ​ Per Share Nonvested at January 1, 2020 516,572 ​ $ 4.29 Granted 1,038,044 ​ $ 2.76 Vested (496,797) ​ $ 2.87 Forfeited shares (107,383) ​ $ 7.13 Nonvested at December 31, 2020 950,436 ​ $ 3.04 Granted 916,531 ​ $ 4.58 Vested (690,676) ​ $ 3.43 Forfeited shares (234,232) ​ $ 4.22 Nonvested at December 31, 2021 942,059 ​ $ 3.97 Granted 1,603,434 ​ $ 2.73 Vested (806,241) ​ $ 2.90 Forfeited shares (382,480) ​ $ 4.60 Nonvested at December 31, 2022 1,356,772 ​ $ 2.96 ​ In January 2022, the Company granted an independent director 8,929 shares of restricted common stock, which vested immediately on the date of grant and had a fair value on the date of grant of $3.36 per share. In May 2022, independent directors as well as Mr. Austin J. Shanfelter, the Company’s Executive Chairman, Interim Chief Executive Officer and Interim Chief Financial Officer, were awarded an aggregate of 623,655 shares of restricted common stock. The total number included 193,548 shares, which were awarded to the six independent directors and vested immediately on the date of the grant, as well as 430,107 shares of time-vested restricted stock units awarded to Mr. Shanfelter. In September 2022, 179,211 of the time-vested restricted stock units cliff vested and were settled in stock as a result of Mr. Shanfelter fulfilling his term as Interim Chief Executive Officer. In March 2023, the remaining 250,896 time-vested restricted stock units cliff vested and were settled in stock as a result of Mr. Shanfelter fulfilling his term as Executive Chairman. The fair value on the date of the grant of all shares awarded in May 2022 was $2.79 per share. In August 2022, the Company granted an executive 446,097 shares of restricted common stock with a vesting period of three years. In addition, the Company granted the executive 241,636 performance-based units. The performance-based units will potentially vest 100% if the target is met, with 100% of the units to be earned based on the achievement of an objective, tiered return on invested capital, measured over a three-year performance period. The Company evaluates the probability of achieving this each reporting period. The fair value of all grants awarded in August 2022 was $2.69 per unit. In September 2022, the Company granted an executive 130,909 shares of restricted common stock with a vesting period of three years. In addition, the Company granted the executive 87,273 performance-based units. The performance-based units will potentially vest 100% if the target is met, with 100% of the units to be earned based on the achievement of an objective, tiered return on invested capital, measured over a three-year performance period. The Company evaluates the probability of achieving this each reporting period. The fair value of all grants awarded in September 2022 was $2.75 per unit. In November 2022, the Company granted an executive of the Company 64,935 shares of restricted common stock, which vested immediately on the date of grant. The fair value of all shares awarded on the date of grant was $2.31 per share. In May 2021, the Company’s six independent directors each received equity compensation grants of 14,975 shares, with a fair value of $6.01 per share. In September 2021, the Company granted an independent director 18,215 shares of restricted common stock, which vested immediately on the date of grant. The fair value of all shares awarded on the date of grant was $5.49. In May 2021, certain officers and executives of the Company were awarded 160,000 shares of restricted common stock with a vesting period of three years and a fair value of $6.01 per share. In September 2021, the Company granted an executive of the Company 9,901 shares of restricted common stock with a vesting period of three years and a fair value of $5.05 per share. In May 2021, the Company awarded certain executives 240,000 performance-based units. The performance-based units will potentially vest 100% if the target is met, with 100% of the units to be earned based on the achievement of an objective, tiered return on invested capital, measured over a three-year performance period. The Company evaluates the probability of achieving this each reporting period. The fair value of all units awarded on the date of the grant was $6.01 per unit. In December 2021, certain officers and executives of the Company were awarded 139,000 shares of restricted common stock with a vesting period of three years and a fair value of $3.75 per share. In February 2020, the Company granted an executive of the Company 15,121 shares of restricted common stock, which vested immediately on the date of grant. The fair value of all shares awarded on the date of grant was $4.96 per share. In March 2020, certain officers and executives of the Company were awarded 170,235 shares of restricted common stock with a vesting period of three years and a fair value of $3.73 per share. In May 2020, the Company’s six independent directors each received equity compensation grants of 39,823 shares, with a fair value of $2.26 per share. In May 2020, certain officers and executives of the Company were awarded 100,000 shares of restricted common stock with a vesting period of three years and a fair value of $2.26 per share. In September 2020, the Company granted an executive of the Company 25,000 shares of restricted common stock with a vesting period of three years and a fair value of $2.58 per share. In May 2020, the Company awarded certain executives 300,000 performance-based units. The performance-based units will potentially vest 50% if the target is met, with 25% each vesting on the second and third anniversary of the determination that the target was met, with 100% of the units to be earned based on the achievement of an objective, tiered return on invested capital, measured over a one-year performance period ending June 30,2021. The Company evaluates the probability of achieving this each reporting period. The fair value of all units awarded on the date of the grant was $2.26 per unit. In August 2021, the Company determined the performance-based units awarded in May 2020 vested near the outperformance level established above the target set based on the achievement of an objective, tiered return on invested capital, measured over a one-year performance period ending June 30, 2021. As a result, the executives earned an additional 259,565 performance-based units with a fair value of $2.26, of which 50% vested immediately on the date of determination and 25% each will vest on the first and second anniversary of the date of determination. In August 2020, the Company determined the performance-based units awarded in May 2019 vested at the outperformance level established above the target set based on the achievement of an objective, tiered return on invested capital, measured over a one-year performance period ending June 30, 2020. As a result, the executives earned an additional 93,750 performance-based units with a fair value of $1.96, of which 50% vested immediately on the date of determination and 25% each will vest on the first and second anniversary of the date of determination. In December 2020, certain officers and executives of the Company were awarded 95,000 shares with a vesting period of three years and a fair value of $4.92 per share. Stock Options The following table summarizes the stock option activity under the Company’s equity incentive plans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Weighted ​ ​ ​ ​ ​ ​ Average ​ Average ​ ​ ​ ​ ​ Number ​ Exercise ​ Contractual ​ Aggregate ​ ​ of ​ Price ​ Life ​ Intrinsic ​ ​ Shares ​ Per Share ​ (Years) ​ Value Outstanding at January 1, 2020 1,464,766 ​ $ 7.41 ​ Forfeited (542,151) ​ $ 7.94 ​ Outstanding at December 31, 2020 922,615 ​ $ 7.10 ​ Exercised ​ (28,546) ​ ​ 3.86 ​ ​ ​ ​ ​ Forfeited (169,365) ​ $ 6.32 ​ Outstanding at December 31, 2021 724,704 ​ $ 7.41 ​ Forfeited (421,375) ​ $ 7.49 ​ Outstanding at December 31, 2022 303,329 ​ $ 7.29 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested and expected to vest at December 31, 2022 303,329 ​ $ 7.29 3.18 ​ $ — Exercisable at December 31, 2022 303,329 ​ $ 7.29 3.18 ​ $ — ​ For years ended December 31, 2022, 2021 and 2020, compensation expense related to stock based awards outstanding for the periods was $2.8 million, $2.4 million and $2.0 million, respectively. The Company applies a 3.2% and 5.5% forfeiture rate, which gets compounded over the vesting terms of the individual award, to its restricted stock and option grants, respectively, based on historical analysis. For the years ended December 31, 2022, 2021 and 2020, payments related to tax withholding for share-based compensation for certain officers of the Company were approximately $0.4 million, $0.9 million and $0.2 million, respectively. In the year ended December 31, 2021, the Company received proceeds of approximately $0.1 million upon the exercise of 28,546 options. In the years ended December 31, 2022 and December 31, 2020, no stock options were exercised. As of December 31, 2022, total unrecognized compensation expense related to unvested stock was approximately $3.1 million, which is expected to be recognized over a period of approximately 2.3 years. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Total intrinsic value of options exercised ​ $ — ​ $ 50 ​ $ — Total fair value of shares vested ​ $ — ​ $ 93 ​ $ 329 ​

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Benefits	16. All of the Company’s marine segment employees except the Associate Divers, the Associate Tugmasters, and union employees in the Pacific Northwest, are eligible to participate in the Company’s 401(k) Retirement Plan after completing six months of service. Each participant may contribute between 1% and 80% of eligible compensation on a pre-tax basis, up to the annual IRS limit. The Company matches 100% on the first 2% of eligible compensation contributed to the Plan and 50% on the next 2% of eligible compensation contributed to the Plan. Participants’ contributions are fully vested at all times. Employer matching contributions vest over a four-year period. At its discretion, the Company may make additional matching and profit-sharing contributions. During the years ended December 31, 2022, 2021 and 2020 the Company contributed $1.4 million, $1.4 million and $1.2 million, respectively to the Plan. All of the Company’s concrete segment employees except Leads, Helpers, Laborers, Finishers, Formsetters, Carpenters, Rodbusters, Patchmen, Equipment Operators, Field Engineering Trainees and certain Highly Compensated Employees are eligible to participate in the AGC Southwest Chapters 401(k) Retirement Plan, a multiple employer plan, after completing three months of service. Each participant may contribute up to the annual IRS limit. The Company matches 50% on the first 6% of eligible compensation contributed to the Plan. Participants’ contributions are fully vested at all times. Employer matching contributions vest over a five-year period. At its discretion, the Company may make additional matching and profit-sharing contributions. During the year ended December 31, 2022, 2021 and 2020, the Company contributed $1.0 million, $0.9 million and less than $0.1 million, respectively. The Company contributes to several multi-employer defined pension plans under the terms of collective-bargaining agreements that cover its union-represented employees. Risks of participating in these multi-employer plans are different from single-employer plans in the following aspects: ● Assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers; ● If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers; and ● If the Company chooses to stop participating in its multi-employer plans, it may be required to pay a withdrawal liability based on the underfunded status of the plan. The following table presents the Company’s participation in these plans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Protection ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expiration ​ ​ ​ ​ Act ("PPA") ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ of ​ ​ Employer ​ Certified Zone Status ​ FIP/RP ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collective ​ ​ Identification ​ (1) ​ Status ​ Contributions ​ Surcharge ​ Bargaining Pension Trust Fund ​ Number ​ 2022 ​ 2021 ​ P/I (2) ​ 2022 ​ 2021 ​ 2020 ​ Imposed ​ Agreement International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds 91-6028571 Green Green N/A $ 1,289 $ 1,297 $ 2,480 — 2024 Washington Laborers ​ 91-6022315 ​ Green ​ Green ​ N/A ​ $ 106 ​ $ 244 ​ $ 236 ​ — ​ 2024 Carpenters Retirement Plan of Western Washington 91-6029051 Green Green N/A ​ $ 1,717 ​ $ 1,700 ​ $ 1,898 — 2024 Cement Masons & Plasterers Trust Funds ​ 91-6066773 ​ N/A ​ Green ​ N/A ​ $ — ​ $ 32 ​ $ 39 ​ — ​ N/A Western Conference of Teamsters Pension Trust Fund ​ 91-6145047 ​ Green ​ Green ​ N/A ​ $ 44 ​ $ 44 ​ $ 15 ​ — ​ 2024 Alaska Carpenters Trust Fund 92-0120866 N/A N/A N/A ​ $ — ​ $ — ​ $ 271 — N/A Alaska Laborers Trust Fund 91-6028298 N/A N/A N/A ​ $ — ​ $ — ​ $ 226 — N/A (1) The most recent PPA zone status available in 2022 and 2021 is for the plan’s year end during 2021 and 2020, respectively. Zone status is based on information received from the plan and is indicative of the plans funding status. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded. (2) The FIP/RP Status P/I column indicates plans for which a financial improvement plan ("FIP") or a rehabilitation plan ("RP") is either pending ("P"), or implemented ("I"). There are currently no plans to withdraw from any of the multi-employer plans in which the Company participates.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17. The Company is involved in

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Information	18. The Company currently operates in two reportable segments: marine and concrete. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Segment information for the periods presented is provided as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Marine ​ ​ ​ ​ ​ ​ ​ ​ Contract revenues ​ $ 339,213 ​ $ 263,915 ​ $ 388,173 Operating income ​ 9,787 ​ 5,760 ​ 29,815 Depreciation and amortization expense ​ (16,592) ​ (17,287) ​ (18,369) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ $ 239,369 ​ $ 236,773 ​ $ ​ Property and equipment, net ​ 91,390 ​ 93,383 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Concrete ​ ​ ​ Contract revenues ​ $ 409,109 ​ $ 337,445 ​ $ 321,769 Operating loss ​ (17,817) ​ (15,077) ​ (3,229) Depreciation and amortization expense ​ (7,465) ​ (8,143) ​ (8,848) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ $ 127,786 ​ $ 114,977 ​ $ ​ Property and equipment, net ​ 9,587 ​ 13,271 ​ ​ ​ There was $0.2 million in intersegment revenues between the Company’s two reportable segments for the year ended December 31, 2022. There was less than $0.1 million in intersegment revenues between the Company’s two reportable segments for the year ended December 31, 2021. The marine segment had foreign revenues of $6.7 million and $2.9. million, respectively, for the years ended December 31, 2022 and 2021. These revenues are derived from projects in the Caribbean Basin and Mexico and are paid primarily in U.S. dollars. There was no foreign revenue for the concrete segment.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leases	19. Leases ​ The Company has operating and finance leases for office space, equipment and vehicles. Leases recorded on the balance sheet consists of the following: ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, Leases ​ 2022 2021 Assets ​ ​ ​ ​ ​ Operating lease right-of-use assets, net (1) ​ $ 14,978 $ 14,686 Financing lease right-of-use assets, net (2) ​ 15,839 14,561 Total assets ​ $ 30,817 $ 29,247 Liabilities ​ Current ​ Operating ​ $ 4,738 $ 3,857 Financing ​ 4,031 3,406 Total current ​ 8,769 7,263 Noncurrent ​ Operating ​ 11,018 11,637 Financing ​ 11,102 10,908 Total noncurrent ​ 22,120 22,545 Total liabilities ​ $ 30,889 $ 29,808 (1) Operating lease right-of-use assets are recorded net of accumulated amortization of $10.5 million and $9.5 million as of December 31, 2022 and 2021, respectively. (2) Financing lease right-of-use assets are recorded net of accumulated amortization of $5.1 million and $2.7 million as of December 31, 2022 and 2021, respectively. Other information related to lease term and discount rate is as follows: ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ 2022 2021 Weighted Average Remaining Lease Term (in years) ​ ​ Operating leases 3.90 ​ 4.90 ​ Financing leases 4.36 ​ 4.70 ​ Weighted Average Discount Rate ​ ​ ​ ​ Operating leases 4.86 % 4.75 % Financing leases 5.62 % 4.28 % ​ The components of lease expense are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 2021 2020 Operating lease costs: ​ ​ ​ ​ Operating lease cost ​ $ 5,012 ​ $ 5,814 ​ $ 6,430 Short-term lease cost (1) ​ 1,754 ​ 1,607 ​ 3,871 Financing lease costs: ​ ​ ​ Interest on lease liabilities ​ 767 ​ 491 ​ 548 Amortization of right-of-use assets ​ 3,142 ​ 2,822 ​ 3,324 Total lease cost ​ $ 10,675 ​ $ 10,734 ​ $ 14,173 (1) Includes expenses related to leases with a lease term of more than one month but less than one year. Supplemental cash flow information related to leases is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 ​ 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ Operating cash flows for operating leases $ 4,966 ​ $ 5,666 ​ $ 6,262 Operating cash flows for finance leases $ 767 ​ $ 491 ​ $ 548 Financing cash flows for finance leases $ 2,992 ​ $ 3,035 ​ $ 3,619 Non-cash activity: ​ ​ ​ ​ ROU assets obtained in exchange for new operating lease liabilities $ 6,740 ​ $ 1,567 ​ $ 7,829 ROU assets obtained in exchange for new financing lease liabilities $ 9,368 ​ $ 7,318 ​ $ 11,270 ​ Maturities of lease liabilities are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases ​ Finance Leases Year ending December 31, ​ ​ ​ ​ ​ ​ 2023 ​ $ 5,386 ​ $ 4,322 2024 ​ 4,628 ​ 4,436 2025 ​ 3,185 ​ 3,307 2026 ​ 1,770 ​ 1,815 2027 ​ 1,704 ​ 1,529 Thereafter ​ 656 ​ 1,583 Total future minimum lease payments ​ 17,329 ​ 16,992 Less - amount representing interest ​ 1,573 ​ 1,859 Present value of future minimum lease payments ​ 15,756 ​ 15,133 Less - current lease obligations ​ 4,738 ​ 4,031 Long-term lease obligations ​ $ 11,018 ​ $ 11,102 ​

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2022
Subsequent Event
Subsequent Event	20. Subsequent Events ​ On March 10, 2023, the United States Navy awarded the Dragados/Hawaiian Dredging/Orion Joint Venture a $2.8 billion contract to complete the construction of a dry dock at Pearl Harbor Naval Shipyard. The Orion portion of work totals million. The project work will be performed in Hawaii and is expected to be completed by September 2027. This contract is part of the United States Navy’s Shipyard Infrastructure Optimization Program, a critical investment in increasing capacity and modernizing our nation’s shipyards to accommodate larger surface ships and Virginia-class submarines. In accordance with the Navy’s mandate for the project, the work will be undertaken with consideration of how it impacts the environment, natural and cultural resources and water and air quality. ​ On March 14, 2023, Management obtained a consent with respect to the delivery of its annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders .

Schedule II - Valuation And Qua

Schedule II - Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2022
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation And Qualifying Accounts	ORION GROUP HOLDINGS, INC. SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Dollars in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at the Charged to ​ ​ Balance at the ​ ​ Beginning of ​ Revenue, Cost ​ ​ ​ End of Description ​ the Period ​ or Expense ​ Deduction ​ the Period Year ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ Allowance for credit losses ​ $ 2,600 ​ $ (487) ​ $ 1,702 ​ $ 411 Deferred tax asset valuation allowance ​ $ 16,960 ​ $ (4,587) ​ $ (120) ​ $ 12,493 Reserve for losses on uncompleted contracts ​ $ 10,925 ​ $ 543 ​ $ 9,995 ​ $ 1,473 Year ended December 31, 2021 ​ ​ ​ ​ Allowance for credit losses ​ $ 411 ​ $ — ​ $ 88 ​ $ 323 Deferred tax asset valuation allowance ​ $ 12,493 ​ $ 3,294 ​ $ 344 ​ $ 15,443 Reserve for losses on uncompleted contracts ​ $ 1,473 ​ $ 33 ​ $ 1,472 ​ $ 34 Year ended December 31, 2022 ​ ​ ​ ​ Allowance for credit losses ​ $ 323 ​ $ 322 ​ $ 39 ​ $ 606 Deferred tax asset valuation allowance ​ $ 15,443 ​ $ 2,114 ​ $ — ​ $ 17,557 Reserve for losses on uncompleted contracts ​ $ 34 ​ $ 351 ​ $ 32 ​ $ 353 ​

Summary of Significant Accoun_2

Summary of Significant Accounting Principles (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These consolidated financial statements include the accounts of the parent company, Orion Group Holdings, Inc. and its wholly-owned subsidiaries and have been prepared in accordance with U.S. GAAP on the going concern basis of accounting, which assumes the Company will continue to operate as a going concern and which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. All intercompany balances and transactions have been eliminated in consolidation. ​ In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable that a company will be unable to meet its obligations as they become due within one year after the date that the consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date that the financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued; and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. Generally, to be considered probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued. The Company has sustained operating losses for the years ended December 31, 2022 and 2021. The assessment of the liquidity and going concern requires the Company to make estimates of future activity and judgments about whether the Company is compliant with financial covenant calculations under its debt and other agreements and has adequate liquidity to operate. Significant assumptions used in the Company's forecasted model of liquidity include forecasted sales, costs, and capital expenditures; expected timing and proceeds of planned real estate transactions. Also as described in Note 11, the Company had $35.0 million of outstanding indebtedness under its Credit Facility as of December 31, 2022 which matures on July 31, 2023. As of the date of these financial statements, the Company’s existing cash and cash equivalents are not sufficient to satisfy the Company’s operating cash needs for at least one year after the issuance of these financial statements. ​ To alleviate these conditions, the Company is engaged in a syndication process to refinance the outstanding debt. Based on the advanced nature of our discussions, the completion of substantial due diligence by potential lenders, agreement among the parties on key terms of a new credit facility, and the expected timeline for documentation and execution of a new credit agreement, Management believes it will successfully complete a refinancing transaction prior to the maturity of the current credit facility. Additionally, the Company is exploring sales of underutilized assets as a source of liquidity. ​ The Company’s ability to continue as a going concern is dependent upon obtaining sufficient liquidity to repay its existing credit facility through a combination of proceeds from new debt, proceeds from the sale of underutilized assets, and operating cash flow. As the Company’s refinancing activities are ongoing, there can be no assurances that the Company will be able to secure financing on terms that are acceptable to the Company or at all. ​ These conditions raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the financial statements are issued. While management has developed and is in process to implement plans that management believes could alleviate in the future the substantial doubt that was raised, management concluded at the date of the issuance of the financial statements that substantial doubt exists as those plans are not within the control of management. The Company’s consolidated financial statements do not include adjustments, if any, that may arise from the outcome of this uncertainty. ​ There is an explanatory paragraph included in the report of the Company’s independent registered public accounting firm describing the uncertainty about the Company’s ability to continue as a going concern, which is considered an event of noncompliance under the Company’s Credit Facility. Management has obtained a consent with respect to the delivery of annual financial statements with an audit opinion unqualified as to going concern from the Credit Facility lenders, and the Company is compliant with the financial covenants of the credit agreement.
Revenue Recognition	Revenue Recognition The Company’s revenue is derived from contracts to provide marine construction, dredging, turnkey concrete services, and other specialty services. The Company’s projects are typically brief in duration, but occasionally, span a period of over one year. The Company determines the appropriate accounting treatment for each contract before work begins and, subject to qualifications discussed in the next paragraph, generally records contract revenue over time. Performance obligations are promises in a contract to transfer distinct goods or services to the customer and are the unit of account under Topic 606. Each of the Company’s contracts and related change orders typically represent a single performance obligation because the Company provides an integrated service and individual goods and services are not separately identifiable. Revenue is recognized over time because control of the promised goods and services are continuously transferred to the customer over the life of the contract. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using its best estimate of the stand-alone selling price of each distinct good or service. Progress is measured by the percentage of actual contract costs incurred to date to total estimated costs for each contract. This method is used because management considers contract costs incurred to be the best available measure of progress on these contracts. Contract costs include all direct costs, such as material and labor, and those indirect costs incurred that are related to contract performance such as payroll taxes and insurance. General and administrative costs are charged to expense as incurred. Upfront costs, such as costs to mobilize personnel and equipment prior to satisfying a performance obligation are capitalized and amortized over the contract performance period. Changes in job performance, job conditions and estimated profitability, including those arising from final contract settlements, may result in revisions to costs and reported revenue and are recognized in the period in which the revisions are determined. The effect of changes in estimates of contract revenue or contract costs is recognized as an adjustment to recognized revenue on a cumulative catch-up basis. When the Company anticipates a loss on a contract that is not yet complete, it recognizes the entire loss in the period in which such losses are determined. Revenue is recorded net of any sales taxes collected and paid on behalf of the customer, if applicable. Contract revenue is derived from the original contract price as modified by agreed-upon change orders and estimates of variable consideration related to incentive fees and change orders or claims for which price has not yet been agreed by the customer. The Company estimates variable consideration based on its assessment of the most likely amount to which it expects to be entitled. Variable consideration is included in the estimated recognition of revenue to the extent it is probable that a significant reversal of cumulative recognized revenue will not occur. A determination that the collection of a claim is probable is based upon compliance with the terms of the contract and the extent to which the Company performed in accordance therewith but does not guarantee collection in full. Assets and liabilities derived from contracts with customers include the following: ● Accounts Receivable: Trade, net of allowance - Represent amounts billed and currently due from customers and are stated at their estimated net realizable value. ● Accounts Receivable: Retainage - Represent amounts which have not been billed to or paid by customers due to retainage provisions in construction contracts, which amounts generally become payable upon contract completion and acceptance by the customer. ● Contract Assets - Represent revenues recognized in excess of amounts billed, which management believes will be billed and collected within one year of the completion of the contract and are recorded as a current asset, until such amounts are either received or written off. ● Contract Liabilities - Represent billings in excess of revenues recognized and are recorded as a current liability, until the underlying obligation has been performed or discharged. ​
Classification of Current Assets and Liabilities	Classification of Current Assets and Liabilities The Company includes in current assets and liabilities amounts realizable and payable in the normal course of contract completion.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. At times, cash held by financial institutions may exceed federally insured limits. The Company has not historically sustained losses on its cash balances in excess of federally insured limits. Cash equivalents at December 31, 2022 and December 31, 2021 consisted primarily of overnight bank deposits.
Risk Concentrations	Risk Concentrations Financial instruments that potentially subject the Company to concentrations of credit risk principally consist of accounts receivable. The Company depends on its ability to continue to obtain federal, state and local governmental contracts, and indirectly, on the amount of funding available to these agencies for new and current governmental projects. Therefore, a portion of the Company’s operations is dependent upon the level and timing of government funding. Statutory mechanics liens provide the Company high priority in the event of lien foreclosures following financial difficulties of private owners, thus minimizing credit risk with private customers.
Accounts Receivable	Accounts Receivable Accounts receivable are stated at the historical carrying value, net of allowances for credit losses. The Company had significant investments in billed and unbilled receivables as of December 31, 2022 and December 31, 2021. Billed receivables represent amounts billed upon the completion of small contracts and progress billings on large contracts in accordance with contract terms and milestone achievements. Unbilled receivables on contracts represent recoverable costs and accrued profits that are not yet capable of being billed under the terms of the applicable contracts. Revenue associated with these billings is recorded net of any sales tax, if applicable. Past due balances over 90 days and other higher risk receivables identified by management are reviewed individually for collectability. In establishing an allowance for credit losses, the Company evaluates its contract receivables and contract assets and thoroughly reviews historical collection experience, the financial condition of its customers, billing disputes and other factors. The Company writes off potentially uncollectible accounts receivable against the allowance for credit losses if it is determined that the amounts will not be collected or if a settlement with respect to a disputed receivable is reached for an amount that is less than the carrying value. As of December 31, 2022 and December 31, 2021, the Company had recorded an allowance for credit losses of $0.6 million and $0.3 million, respectively. Balances billed to customers but not paid pursuant to retainage provisions in construction contracts generally become payable upon contract completion and acceptance by the owner. Retainage at December 31, 2022 totaled $50.9 million, of which $4.9 million is expected to be collected beyond December 31, 2023. Retainage at December 31, 2021 totaled $41.4 million. From time to time, the Company negotiates change orders and claims with its customers. Unsuccessful negotiations of claims could result in a change to contract revenue that is less than amounts previously recorded, which could result in the recording of a loss in the amount of the shortfall. Successful claims negotiations could result in the recovery of previously recorded losses. Significant losses on receivables could adversely affect the Company’s financial position, results of operations and overall liquidity.
Advertising Costs	Advertising Costs The Company primarily obtains contracts through the open bid process, and therefore advertising costs are not a significant component of expense. Advertising costs are expensed as incurred.
Environmental Costs	Environmental Costs Costs related to environmental remediation are charged to expense. Other environmental costs are also charged to expense unless they increase the value of the property and/or provide future economic benefits, in which event the costs are capitalized. Environmental liabilities, if any, are recognized when the liability is considered probable and the amount can be reasonably estimated. The Company did not recognize any environmental liabilities as of December 31, 2022 or December 31, 2021.
Fair Value Measurements	Fair Value Measurements The Company evaluates and presents certain amounts included in the accompanying consolidated financial statements at “fair value” in accordance with U.S. GAAP, which requires the Company to base its estimates on assumptions that market participants, in an orderly transaction, would use to price an asset or liability, and to establish a hierarchy that prioritizes the information used to determine fair value. Refer to Note 8 The Company generally applies fair value valuation techniques on a non-recurring basis associated with (1) valuing assets and liabilities acquired in connection with business combinations and other transactions; (2) valuing potential impairment loss related to long-lived assets; and (3) valuing potential impairment loss related to goodwill and indefinite-lived intangible assets.
Inventory	Inventory Current inventory consists of parts and small equipment held for use in the ordinary course of business and is valued at the lower of cost (using historical average cost) or net realizable value. Where shipping and handling costs are incurred by the Company, these charges are included in inventory and charged to cost of contract revenue upon use. Non-current inventory consists of spare parts (including engines, cutters and gears) that require special order or long-lead times for manufacture or fabrication, but must be kept on hand to reduce downtime and is valued at the lower of cost (using historical average cost) or net realizable value.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost. Ordinary maintenance and repairs that do not improve or extend the useful life of the asset are expensed as incurred. Major renewals and betterments of equipment are capitalized and depreciated generally over three When property and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in results of operations for the respective period. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets for financial statement purposes, as follows: ​ ​ ​ ​ Automobiles and trucks 3 to 10 years Buildings and improvements 10 to 30 years Construction equipment 3 to 10 years Vessels and other equipment 3 to 40 years Office equipment 3 to 5 years ​ The Company generally uses accelerated depreciation methods for tax purposes where beneficial. Dry-docking costs are capitalized and amortized using the straight-line method over a period ranging from three determine if the estimates are accurate. If warranted, a significant upgrade of equipment may result in a revision to the useful life of the asset, in which case the change is accounted for prospectively. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset or asset group may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or the fair value, less the costs to sell, and are no longer depreciated. There was $0.8 million of assets classified as held for sale as of December 31, 2022 included in prepaid expenses and other in the Company’s Consolidated Balance Sheets. There was no assets classified as held for sale as of December 31, 2021.
Leases	Leases Management determines if a contract is or contains a lease at inception of the contract or modification of the contract. A contract is or contains a lease if the contract conveys the right to control the use of an identified asset for a period in exchange for consideration. Control over the use of the identified asset means the lessee has both (a) the right to obtain substantially all of the economic benefits from the use of the asset and (b) the right to direct the use of the asset. Finance and operating lease right-of-use (“ROU”) assets and liabilities are recognized based on the present value of future minimum lease payments over the expected lease term at commencement date. As the implicit rate is not determinable in most of the Company’s leases, management uses the Company’s incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The expected lease term includes options to extend or terminate the lease when it is reasonably certain the Company will exercise such option. Lease expense for minimum lease payments is recognized on a straight-line basis over the expected lease term. The Company’s lease arrangements have lease and non-lease components. Leases with an expected term of 12 months or less are not accounted for on the balance sheet and the related lease expense is recognized on a straight-line basis over the expected lease term. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. See Note 19
Intangible Assets	Intangible Assets Intangible assets that have finite lives are amortized. In addition, the Company evaluates the remaining useful life of intangible assets in each reporting period to determine whether events and circumstances warrant a revision of the remaining period of amortization. If the estimate of an intangible asset’s remaining life is changed, the remaining carrying value of such asset is amortized prospectively over that revised remaining useful life. Intangible assets that have infinite lives are not amortized, but are subject to impairment testing at least annually or more frequently if events or circumstances indicate that the asset may be impaired. The Company has one infinite-lived intangible asset, a trade name, which it tests for impairment annually on October 31, or whenever events or circumstances indicate that the carrying amount of the trade name may not be recoverable. Impairment is calculated as the excess of the trade name’s carrying value over its fair value. The fair value of the trade name is determined using the relief from royalty method, a variation of the income approach. This method assumes that if a company owns intellectual property, it does not have to “rent” the asset and is, therefore, “relieved” from paying a royalty. Once a supportable royalty rate is determined, the rate is then applied to the projected revenues over the expected remaining life of the intangible assets to estimate the royalty savings. This approach is dependent on a number of factors, including estimates of future growth and trends, royalty rates, discount rates and other variables. See Note 9
Stock-Based Compensation	Stock-Based Compensation The Company recognizes compensation expense for equity awards over the vesting period based on the fair value of these awards at the date of grant. The computed fair value of these awards is recognized as a non-cash cost over the period the employee provides services, which is typically the vesting period of the award. The fair value of restricted stock grants and restricted stock units is equivalent to the fair value of the stock issued on the date of grant and is measured as the closing price of the stock on the date of grant. Compensation expense is recognized only for stock-based payments expected to vest. The Company estimates forfeitures at the date of grant based on historical experience and future expectations. This assessment is updated on a periodic basis. See Note 15
Income Taxes	Income Taxes The Company determines its consolidated income tax provision using the asset and liability method prescribed by U.S. GAAP, which requires the recognition of income tax expense for the amount of taxes payable or refundable for the current period and for deferred tax liabilities and assets for the future tax consequences of events that have been recognized in an entity’s financial statements or tax returns. The Company must make significant assumptions, judgments and estimates to determine its current provision for income taxes, its deferred tax assets and liabilities, and any valuation allowance to be recorded against any deferred tax asset. The current provision for income tax is based upon the current tax laws and the Company’s interpretation of these laws, as well as the probable outcomes of any tax audits. The value of any net deferred tax asset depends upon estimates of the amount and category of future taxable income reduced by the amount of any tax benefits that the Company does not expect to realize. Actual operating results and the underlying amount and category of income in future years could render current assumptions, judgments and estimates of recoverable net deferred taxes inaccurate, thus impacting the Company’s financial position and results of operations. The Company computes deferred income taxes using the liability method. Under the liability method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Under the liability method, the effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company accounts for uncertain tax positions in accordance with the provisions of ASC 740, Income Taxes ​ See Note 13
Insurance Coverage	Insurance Coverage The Company maintains insurance coverage for its business and operations. Insurance related to property, equipment, automobile, general liability, and a portion of workers’ compensation is provided through traditional policies, subject to a deductible or deductibles. A portion of the Company’s workers’ compensation exposure is covered through a mutual association, which is subject to supplemental calls. The marine segment maintains five levels of excess loss insurance coverage, totaling $200 million in excess of primary coverage. The marine segment’s excess loss coverage responds to most of its policies when a primary limit of $1 million has been exhausted; provided that the primary limit for Contingent Maritime Employer’s Liability is $10 million and the Watercraft Pollution Policy primary limit is $5 million. The concrete segment maintains five levels of excess loss insurance coverage, totaling $200 million in excess of primary coverage. The concrete segment’s excess loss coverage responds to most of its policies when a primary limit of $1 million has been exhausted. If a claim arises and a potential insurance recovery is probable, the impending gain is recognized separately from the related loss. The recovery will only be recognized up to the amount of the loss once the recovery of the claim is deemed probable and any excess gain will fall under contingency accounting and will only be recognized once it is realized. The Company does not net insurance recoveries against the related claim liability as the amount of the claim liability is determined without consideration of the anticipated insurance recoveries from third parties. Separately, the Company’s marine segment employee health care is paid for by general assets of the Company and currently administered by a third party. The administrator has purchased appropriate stop-loss coverage. Losses on these policies up to the deductible amounts are accrued based upon known claims incurred and an estimate of claims incurred but not reported. The accruals are derived from known facts, historical trends and industry averages to determine the best estimate of the ultimate expected loss. Actual claims may vary from estimates. Any adjustments to such reserves are included in the Consolidated Statements of Operations in the period in which they become known. The Company’s concrete segment employee health care is provided through two policies. A fully funded policy is offered primarily to salaried employees and their dependents while a partially self-funded plan with an appropriate stop-loss is offered primarily to hourly employees and their dependents. The self-funded plan is funded to the maximum exposure and, as a result, is expected to receive a partial refund after the policy expiration. The total accrual for insurance claims liabilities was $5.8 million and $19.8 million at December 31, 2022 and December 31, 2021, respectively, reflected as a component of accrued liabilities in the consolidated balance sheet. The total accrual for insurance claims receivable was none and $13.3 million at December 31, 2022 and December 31, 2021, respectively, reflected as a component of other current accounts receivable in the consolidated balance sheet .

Summary of Significant Accoun_3

Summary of Significant Accounting Principles (Tables)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Schedule of depreciable lives of property, plant and equipment	​ ​ ​ ​ Automobiles and trucks 3 to 10 years Buildings and improvements 10 to 30 years Construction equipment 3 to 10 years Vessels and other equipment 3 to 40 years Office equipment 3 to 5 years ​

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Schedule of disaggregation of revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2022 2021 2020 Marine Segment ​ ​ ​ Construction ​ $ 239,656 ​ $ 169,554 ​ $ 272,870 Dredging ​ 85,414 ​ 80,831 ​ 106,647 Specialty Services ​ 14,143 ​ 13,530 ​ 8,656 Marine segment contract revenues ​ $ 339,213 ​ $ 263,915 ​ $ 388,173 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Concrete Segment ​ ​ ​ Structural ​ $ 57,425 ​ $ 58,420 ​ $ 85,904 Light Commercial ​ 351,684 ​ 279,018 ​ 235,835 Other ​ — ​ 7 ​ 30 Concrete segment contract revenues ​ $ 409,109 ​ $ 337,445 ​ $ 321,769 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total contract revenues ​ $ 748,322 ​ $ 601,360 ​ $ 709,942 ​

Concentration of Risk and Ent_2

Concentration of Risk and Enterprise-Wide Disclosures (Tables)	12 Months Ended
	Dec. 31, 2022
Trade and contract retainage receivables
Concentration Risk [Line Items]
Schedules of concentration of risk, by risk factor	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ December 31, 2021 Federal Government $ 4,612 3 % $ 6,563 5 % State Governments ​ 3,111 2 % 61 - % Local Governments ​ 16,197 10 % 11,923 9 % Private Companies ​ 134,317 85 % 111,328 86 % Gross receivables ​ ​ 158,237 ​ 100 % ​ 129,875 ​ 100 % Allowance for credit losses ​ ​ (606) ​ ​ ​ ​ (323) ​ ​ ​ Net receivables ​ $ 157,631 ​ ​ $ 129,552 ​ ​ ​
Contract revenues
Concentration Risk [Line Items]
Schedules of concentration of risk, by risk factor	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 % 2021 % 2020 % Federal Government $ 80,116 11 % $ 54,480 9 % $ 51,793 7 % State Governments 62,516 8 % 4,790 1 % 27,574 4 % Local Government 125,015 17 % 120,311 20 % 202,839 29 % Private Companies 480,675 64 % 421,779 70 % 427,736 60 % Total contract revenues $ 748,322 100 % $ 601,360 100 % $ 709,942 100 % ​

Contracts in Progress (Tables)

Contracts in Progress (Tables)	12 Months Ended
	Dec. 31, 2022
Contractors [Abstract]
Schedule of contracts in progress	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Costs incurred on uncompleted contracts ​ $ 1,251,853 ​ $ 1,138,298 Estimated earnings ​ 180,705 ​ 168,861 ​ ​ 1,432,558 ​ 1,307,159 Less: Billings to date ​ (1,426,375) ​ (1,305,628) ​ ​ $ 6,183 ​ $ 1,531 Included in the accompanying Consolidated Balance Sheets under the following captions: ​ ​ Contract assets ​ $ 43,903 ​ $ 28,529 Contract liabilities ​ (37,720) ​ (26,998) ​ ​ $ 6,183 ​ $ 1,531 ​

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Summary of property and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Automobiles and trucks ​ $ 2,232 ​ $ 2,337 Building and improvements ​ 36,952 ​ 34,796 Construction equipment ​ 130,660 ​ 137,786 Vessels and other equipment ​ 91,495 ​ 82,455 Office equipment ​ 6,885 ​ 6,430 ​ ​ 268,224 ​ 263,804 Less: Accumulated depreciation ​ (195,948) ​ (191,542) Net book value of depreciable assets ​ 72,276 ​ 72,262 Construction in progress ​ 816 ​ 6,507 Land ​ 27,885 ​ 27,885 ​ ​ $ 100,977 ​ $ 106,654 ​

Other Current Accounts Receiv_2

Other Current Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2022
Other Current Accounts Receivable
Schedule of other current accounts receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Insurance claims receivable ​ $ — ​ $ 13,273 Accident loss receivables ​ 1,328 ​ 3,760 Vendor receivables ​ ​ 807 ​ ​ 118 Purchase incentive receivable ​ ​ 695 ​ ​ — Bond premium dividend receivable ​ ​ 391 ​ ​ 385 Other current accounts receivable ​ ​ 305 ​ ​ 49 Total other current accounts receivable ​ $ 3,526 ​ $ 17,585

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of fair value, assets and liabilities measured on recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements ​ Carrying Value Level 1 Level 2 Level 3 December 31, 2022 ​ ​ ​ ​ ​ Assets: ​ Cash surrender value of life insurance policy ​ $ 1,811 — 1,811 — December 31, 2021 ​ ​ ​ ​ ​ Assets: ​ Cash surrender value of life insurance policy ​ $ 2,813 — 2,813 — ​

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes and amortization of finite-lived intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ ​ 2022 ​ 2021 Finite-lived intangible assets, beginning of period ​ $ 35,240 ​ $ 35,240 Additions ​ — ​ — Total finite-lived intangible assets, end of period ​ $ 35,240 ​ $ 35,240 ​ ​ ​ ​ ​ ​ ​ Accumulated amortization, beginning of period ​ $ (33,576) ​ $ (32,055) Current year amortization ​ (1,239) ​ (1,521) Total accumulated amortization ​ (34,815) ​ (33,576) ​ ​ ​ ​ ​ ​ ​ Net finite-lived intangible assets, end of period ​ $ 425 ​ ​ 1,664 Infinite-lived intangible assets ​ ​ 6,892 ​ ​ 6,892 Total net intangible assets ​ $ 7,317 ​ $ 8,556 ​
Summary of finite-lived intangible assets amortization expense	​ ​ ​ ​ ​ 2023 ​ 388 2024 ​ 37 ​ ​ $ 425 ​

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Payables and Accruals [Abstract]
Schedule of accrued liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Accrued salaries, wages and benefits ​ $ 7,605 ​ $ 9,879 Accrued liabilities expected to be covered by insurance ​ 5,757 ​ 19,818 Sales taxes ​ 1,737 ​ 5,113 Property taxes ​ 522 ​ 1,047 Sale-leaseback arrangement ​ ​ 813 ​ ​ 743 Accounting and audit fees ​ ​ 222 ​ ​ 413 Interest ​ 60 ​ 23 Other accrued expenses ​ 1,750 ​ 1,558 Total accrued liabilities ​ $ 18,466 ​ $ 38,594

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of debt	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ December 31, 2021 ​ ​ Debt Issuance ​ ​ Debt Issuance ​ ​ ​ Principal ​ Costs (1) ​ Total ​ Principal ​ Costs (1) ​ Total Revolving line of credit ​ $ 35,000 ​ $ (327) ​ $ 34,673 ​ $ 39,000 ​ $ — ​ $ 39,000 Other debt ​ ​ 283 ​ ​ — ​ ​ 283 ​ ​ 141 ​ ​ — ​ ​ 141 Total current debt ​ 35,283 ​ (327) ​ 34,956 ​ 39,141 ​ — ​ 39,141 Other debt ​ ​ 716 ​ ​ — ​ ​ 716 ​ ​ 259 ​ ​ — ​ ​ 259 Total long-term debt ​ ​ 716 ​ ​ — ​ ​ 716 ​ ​ 259 ​ ​ — ​ ​ 259 Total debt ​ $ 35,999 ​ $ (327) ​ $ 35,672 ​ $ 39,400 ​ $ — ​ $ 39,400 (1) Total debt issuance costs, include underwriter fees, legal fees and syndication fees and fees related to the execution of the Ninth Amendment to the Credit Agreement.

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]
Schedule of other long-term liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Sale-leaseback arrangement ​ $ 15,156 ​ $ 15,969 Deferred compensation ​ 1,639 ​ 2,759 Accrued liabilities expected to be covered by insurance ​ ​ 277 ​ 214 Total other long-term liabilities ​ $ 17,072 ​ $ 18,942 ​

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of components of income tax (benefit) expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current Deferred Total Year ended December 31, 2022 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 449 ​ $ (29) ​ ​ 420 Foreign ​ (34) ​ 43 ​ 9 ​ ​ $ 415 ​ $ 14 ​ $ 429 Year ended December 31, 2021 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 243 ​ ​ (20) ​ ​ 223 Foreign ​ 268 ​ 11 ​ 279 ​ ​ $ 511 ​ $ (9) ​ $ 502 Year ended December 31, 2020 ​ ​ ​ U.S. Federal ​ $ — ​ $ — ​ $ — State and local ​ 589 ​ ​ 13 ​ ​ 602 Foreign ​ 1,370 ​ 4 ​ 1,374 ​ ​ $ 1,959 ​ $ 17 ​ $ 1,976 ​
Schedule of effective income tax reconciliation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Statutory amount ​ $ (2,558) ​ $ (2,952) ​ $ 4,662 ​ Valuation allowance on foreign tax credits ​ (136) ​ 186 ​ 1,344 ​ State income tax, net of federal benefit ​ 251 ​ 44 ​ 792 ​ Permanent differences, other ​ 185 ​ 303 ​ 558 ​ Permanent differences, stock compensation ​ 217 ​ (262) ​ 328 ​ Valuation allowance, other ​ 2,251 ​ 3,108 ​ (5,795) ​ Other ​ 219 ​ 75 ​ 87 ​ Consolidated income tax provision ​ $ 429 ​ $ 502 ​ $ 1,976 ​ Consolidated effective tax rate ​ (3.5) % (3.6) % 8.9 % ​
Schedule of deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Long Term ​ ​ As of December 31, ​ 2022 2021 Assets related to: ​ ​ Accrued liabilities ​ $ 1,320 ​ $ 1,568 Intangible assets ​ 2,161 ​ 2,510 Net operating loss carryforward ​ 16,699 ​ 11,966 Stock-based compensation ​ 276 ​ 326 Foreign tax credits ​ 3,831 ​ 3,968 Goodwill ​ 4,328 ​ 5,249 Leases ​ ​ 9,018 ​ ​ 8,772 Other ​ 2,301 ​ 2,040 Total gross deferred tax assets ​ 39,934 ​ 36,399 Less valuation allowance ​ ​ (17,557) ​ ​ (15,443) Total net deferred tax assets ​ ​ 22,377 ​ ​ 20,956 Liabilities related to: ​ ​ Depreciation and amortization ​ (22,362) ​ (20,700) Other ​ (156) ​ (384) Total deferred tax liabilities ​ (22,518) ​ (21,084) Net deferred tax liabilities ​ $ (141) ​ $ (128) ​
Schedule of Unrecognized tax benefits	​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Balance at beginning of the year ​ $ 1,614 ​ $ 1,614 Additions based on tax position related to current year ​ — ​ — Additions based on tax positions related to prior years ​ — ​ — Reductions based on tax positions related to current year ​ — ​ — Reductions based on tax positions related to prior years ​ — ​ — Settlements with tax authorities ​ — ​ — Lapse of statute of limitations ​ — ​ — Balance at end of the year ​ $ 1,614 ​ $ 1,614 ​

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Schedule of earnings per share, basic and diluted	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2022 2021 2020 Basic: Weighted average shares outstanding 31,402,328 30,763,527 30,122,362 Diluted: Total basic weighted average shares outstanding 31,402,328 30,763,527 30,122,362 Effect of potentially dilutive securities: Common stock options — — — Total weighted average shares outstanding assuming dilution 31,402,328 30,763,527 30,122,362

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ Number ​ Average ​ ​ of ​ Fair Value ​ ​ Shares ​ Per Share Nonvested at January 1, 2020 516,572 ​ $ 4.29 Granted 1,038,044 ​ $ 2.76 Vested (496,797) ​ $ 2.87 Forfeited shares (107,383) ​ $ 7.13 Nonvested at December 31, 2020 950,436 ​ $ 3.04 Granted 916,531 ​ $ 4.58 Vested (690,676) ​ $ 3.43 Forfeited shares (234,232) ​ $ 4.22 Nonvested at December 31, 2021 942,059 ​ $ 3.97 Granted 1,603,434 ​ $ 2.73 Vested (806,241) ​ $ 2.90 Forfeited shares (382,480) ​ $ 4.60 Nonvested at December 31, 2022 1,356,772 ​ $ 2.96 ​
Schedule of stock options activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Weighted ​ ​ ​ ​ ​ ​ Average ​ Average ​ ​ ​ ​ ​ Number ​ Exercise ​ Contractual ​ Aggregate ​ ​ of ​ Price ​ Life ​ Intrinsic ​ ​ Shares ​ Per Share ​ (Years) ​ Value Outstanding at January 1, 2020 1,464,766 ​ $ 7.41 ​ Forfeited (542,151) ​ $ 7.94 ​ Outstanding at December 31, 2020 922,615 ​ $ 7.10 ​ Exercised ​ (28,546) ​ ​ 3.86 ​ ​ ​ ​ ​ Forfeited (169,365) ​ $ 6.32 ​ Outstanding at December 31, 2021 724,704 ​ $ 7.41 ​ Forfeited (421,375) ​ $ 7.49 ​ Outstanding at December 31, 2022 303,329 ​ $ 7.29 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Vested and expected to vest at December 31, 2022 303,329 ​ $ 7.29 3.18 ​ $ — Exercisable at December 31, 2022 303,329 ​ $ 7.29 3.18 ​ $ — ​
Schedule of intrinsic value of options exercised and fair value of shares vested	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Total intrinsic value of options exercised ​ $ — ​ $ 50 ​ $ — Total fair value of shares vested ​ $ — ​ $ 93 ​ $ 329

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Schedule of multi-employer plans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pension Protection ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expiration ​ ​ ​ ​ Act ("PPA") ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ of ​ ​ Employer ​ Certified Zone Status ​ FIP/RP ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collective ​ ​ Identification ​ (1) ​ Status ​ Contributions ​ Surcharge ​ Bargaining Pension Trust Fund ​ Number ​ 2022 ​ 2021 ​ P/I (2) ​ 2022 ​ 2021 ​ 2020 ​ Imposed ​ Agreement International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds 91-6028571 Green Green N/A $ 1,289 $ 1,297 $ 2,480 — 2024 Washington Laborers ​ 91-6022315 ​ Green ​ Green ​ N/A ​ $ 106 ​ $ 244 ​ $ 236 ​ — ​ 2024 Carpenters Retirement Plan of Western Washington 91-6029051 Green Green N/A ​ $ 1,717 ​ $ 1,700 ​ $ 1,898 — 2024 Cement Masons & Plasterers Trust Funds ​ 91-6066773 ​ N/A ​ Green ​ N/A ​ $ — ​ $ 32 ​ $ 39 ​ — ​ N/A Western Conference of Teamsters Pension Trust Fund ​ 91-6145047 ​ Green ​ Green ​ N/A ​ $ 44 ​ $ 44 ​ $ 15 ​ — ​ 2024 Alaska Carpenters Trust Fund 92-0120866 N/A N/A N/A ​ $ — ​ $ — ​ $ 271 — N/A Alaska Laborers Trust Fund 91-6028298 N/A N/A N/A ​ $ — ​ $ — ​ $ 226 — N/A (1) The most recent PPA zone status available in 2022 and 2021 is for the plan’s year end during 2021 and 2020, respectively. Zone status is based on information received from the plan and is indicative of the plans funding status. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded. (2) The FIP/RP Status P/I column indicates plans for which a financial improvement plan ("FIP") or a rehabilitation plan ("RP") is either pending ("P"), or implemented ("I").

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of segment reporting	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ ​ 2022 ​ 2021 ​ 2020 Marine ​ ​ ​ ​ ​ ​ ​ ​ Contract revenues ​ $ 339,213 ​ $ 263,915 ​ $ 388,173 Operating income ​ 9,787 ​ 5,760 ​ 29,815 Depreciation and amortization expense ​ (16,592) ​ (17,287) ​ (18,369) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ $ 239,369 ​ $ 236,773 ​ $ ​ Property and equipment, net ​ 91,390 ​ 93,383 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Concrete ​ ​ ​ Contract revenues ​ $ 409,109 ​ $ 337,445 ​ $ 321,769 Operating loss ​ (17,817) ​ (15,077) ​ (3,229) Depreciation and amortization expense ​ (7,465) ​ (8,143) ​ (8,848) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total assets ​ $ 127,786 ​ $ 114,977 ​ $ ​ Property and equipment, net ​ 9,587 ​ 13,271 ​ ​ ​

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of leases recorded on the balance sheet	​ ​ ​ ​ ​ ​ ​ ​ December 31, December 31, Leases ​ 2022 2021 Assets ​ ​ ​ ​ ​ Operating lease right-of-use assets, net (1) ​ $ 14,978 $ 14,686 Financing lease right-of-use assets, net (2) ​ 15,839 14,561 Total assets ​ $ 30,817 $ 29,247 Liabilities ​ Current ​ Operating ​ $ 4,738 $ 3,857 Financing ​ 4,031 3,406 Total current ​ 8,769 7,263 Noncurrent ​ Operating ​ 11,018 11,637 Financing ​ 11,102 10,908 Total noncurrent ​ 22,120 22,545 Total liabilities ​ $ 30,889 $ 29,808 (1) Operating lease right-of-use assets are recorded net of accumulated amortization of $10.5 million and $9.5 million as of December 31, 2022 and 2021, respectively. (2) Financing lease right-of-use assets are recorded net of accumulated amortization of $5.1 million and $2.7 million as of December 31, 2022 and 2021, respectively.
Schedule of information related to lease terms and discount rates	​ ​ ​ ​ ​ ​ ​ December 31, December 31, ​ 2022 2021 Weighted Average Remaining Lease Term (in years) ​ ​ Operating leases 3.90 ​ 4.90 ​ Financing leases 4.36 ​ 4.70 ​ Weighted Average Discount Rate ​ ​ ​ ​ Operating leases 4.86 % 4.75 % Financing leases 5.62 % 4.28 % ​
Schedule of components of lease expense	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 2021 2020 Operating lease costs: ​ ​ ​ ​ Operating lease cost ​ $ 5,012 ​ $ 5,814 ​ $ 6,430 Short-term lease cost (1) ​ 1,754 ​ 1,607 ​ 3,871 Financing lease costs: ​ ​ ​ Interest on lease liabilities ​ 767 ​ 491 ​ 548 Amortization of right-of-use assets ​ 3,142 ​ 2,822 ​ 3,324 Total lease cost ​ $ 10,675 ​ $ 10,734 ​ $ 14,173 (1) Includes expenses related to leases with a lease term of more than one month but less than one year.
Schedule of supplemental cash flow information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, ​ 2022 ​ 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ Operating cash flows for operating leases $ 4,966 ​ $ 5,666 ​ $ 6,262 Operating cash flows for finance leases $ 767 ​ $ 491 ​ $ 548 Financing cash flows for finance leases $ 2,992 ​ $ 3,035 ​ $ 3,619 Non-cash activity: ​ ​ ​ ​ ROU assets obtained in exchange for new operating lease liabilities $ 6,740 ​ $ 1,567 ​ $ 7,829 ROU assets obtained in exchange for new financing lease liabilities $ 9,368 ​ $ 7,318 ​ $ 11,270 ​
Schedule of operating lease maturities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases ​ Finance Leases Year ending December 31, ​ ​ ​ ​ ​ ​ 2023 ​ $ 5,386 ​ $ 4,322 2024 ​ 4,628 ​ 4,436 2025 ​ 3,185 ​ 3,307 2026 ​ 1,770 ​ 1,815 2027 ​ 1,704 ​ 1,529 Thereafter ​ 656 ​ 1,583 Total future minimum lease payments ​ 17,329 ​ 16,992 Less - amount representing interest ​ 1,573 ​ 1,859 Present value of future minimum lease payments ​ 15,756 ​ 15,133 Less - current lease obligations ​ 4,738 ​ 4,031 Long-term lease obligations ​ $ 11,018 ​ $ 11,102
Schedule of finance lease maturities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Leases ​ Finance Leases Year ending December 31, ​ ​ ​ ​ ​ ​ 2023 ​ $ 5,386 ​ $ 4,322 2024 ​ 4,628 ​ 4,436 2025 ​ 3,185 ​ 3,307 2026 ​ 1,770 ​ 1,815 2027 ​ 1,704 ​ 1,529 Thereafter ​ 656 ​ 1,583 Total future minimum lease payments ​ 17,329 ​ 16,992 Less - amount representing interest ​ 1,573 ​ 1,859 Present value of future minimum lease payments ​ 15,756 ​ 15,133 Less - current lease obligations ​ 4,738 ​ 4,031 Long-term lease obligations ​ $ 11,018 ​ $ 11,102

Description of Business and B_2

Description of Business and Basis of Presentation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 segment
Number of operating segments | segment	2	2	2
Number of reportable segments | segment	2	2	2
Principal current | $	$ 35,283	$ 39,141
Revolving Credit Facility
Principal current | $	$ 35,000

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Restricted Cash and Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable [Abstract]
Allowance for credit losses	$ 600	$ 300
Retainage	50,873	$ 41,379
Retainage, long-term	$ 4,900

Summary of Significant Accoun_5

Summary of Significant Accounting Principles - Property and Equipment (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Asset	Dec. 31, 2021 USD ($)
Property, Plant and Equipment
Assets classified as held-for-sale | $	$ 0.8	$ 0
Infinite-lived intangible assets
Number of infinite-lived intangible assets | Asset	1
Equipment improvement | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Equipment improvement | Maximum
Property, Plant and Equipment
Property and equipment useful life	10 years
Automobiles and trucks | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Automobiles and trucks | Maximum
Property, Plant and Equipment
Property and equipment useful life	10 years
Building and improvements | Minimum
Property, Plant and Equipment
Property and equipment useful life	10 years
Building and improvements | Maximum
Property, Plant and Equipment
Property and equipment useful life	30 years
Construction equipment | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Construction equipment | Maximum
Property, Plant and Equipment
Property and equipment useful life	10 years
Vessels and other equipment | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Vessels and other equipment | Maximum
Property, Plant and Equipment
Property and equipment useful life	40 years
Office equipment | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Office equipment | Maximum
Property, Plant and Equipment
Property and equipment useful life	5 years
Dry-docking capitalized costs | Minimum
Property, Plant and Equipment
Property and equipment useful life	3 years
Dry-docking capitalized costs | Maximum
Property, Plant and Equipment
Property and equipment useful life	7 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Insurance Coverage (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) policy item	Dec. 31, 2021 USD ($)
Insurance Coverage
Number of employee health care insurance policies | policy	2
Accrued insurance claims liability	$ 5.8	$ 19.8
Accrued insurance claims receivables	$ 0	$ 13.3
Marine Segment
Insurance Coverage
Levels of insurance coverage maintained by the Company | item	5
Amount in excess of primary insurance coverage	$ 200
Marine Segment | Other liability policies
Insurance Coverage
Primary limit of insurance coverage	1
Marine Segment | Maritime employer's liability
Insurance Coverage
Primary limit of insurance coverage	10
Marine Segment | Watercraft pollution policy
Insurance Coverage
Primary limit of insurance coverage	$ 5
Concrete Segment
Insurance Coverage
Levels of insurance coverage maintained by the Company | item	5
Amount in excess of primary insurance coverage	$ 200
Concrete Segment | Other liability policies
Insurance Coverage
Primary limit of insurance coverage	$ 1

Revenue (Details)

Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($) segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Number of reportable segments | segment	2	2	2
Marine Segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 339,213	$ 263,915	$ 388,173
Marine Segment | Construction
Disaggregation of Revenue [Line Items]
Contract revenues	239,656	169,554	272,870
Marine Segment | Dredging
Disaggregation of Revenue [Line Items]
Contract revenues	85,414	80,831	106,647
Marine Segment | Specialty Services
Disaggregation of Revenue [Line Items]
Contract revenues	14,143	13,530	8,656
Concrete Segment
Disaggregation of Revenue [Line Items]
Contract revenues	409,109	337,445	321,769
Concrete Segment | Structural
Disaggregation of Revenue [Line Items]
Contract revenues	57,425	58,420	85,904
Concrete Segment | Light Commercial
Disaggregation of Revenue [Line Items]
Contract revenues	$ 351,684	279,018	235,835
Concrete Segment | Other
Disaggregation of Revenue [Line Items]
Contract revenues		$ 7	$ 30

Concentration of Risk and Ent_3

Concentration of Risk and Enterprise-Wide Disclosures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) customer	Dec. 31, 2021 USD ($) customer	Dec. 31, 2020 USD ($) customer
Concentration Risk [Line Items]
Allowance for credit losses	$ (606)	$ (323)
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Foreign
Concentration Risk [Line Items]
Contract revenues, percent	0.90%	0.50%	1.80%
Customer concentration risk | Trade and contract retainage receivables
Concentration Risk [Line Items]
Gross receivables	$ 158,237	$ 129,875
Allowance for credit losses	(606)	(323)
Net receivables	$ 157,631	$ 129,552
Number of customers exceeding the 10% benchmark percentage | customer	0	0
Concentration risk, percentage	100%	100%
Customer concentration risk | Contract revenues
Concentration Risk [Line Items]
Number of customers exceeding the 10% benchmark percentage | customer	0	0
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Concentration risk, percentage	100%	100%	100%
Customer concentration risk | Federal Government | Trade and contract retainage receivables
Concentration Risk [Line Items]
Gross receivables	$ 4,612	$ 6,563
Concentration risk, percentage	3%	5%
Customer concentration risk | Federal Government | Contract revenues
Concentration Risk [Line Items]
Contract revenues	$ 80,116	$ 54,480	$ 51,793
Concentration risk, percentage	11%	9%	7%
Customer concentration risk | State Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Gross receivables	$ 3,111	$ 61
Concentration risk, percentage	2%
Customer concentration risk | State Governments | Contract revenues
Concentration Risk [Line Items]
Contract revenues	$ 62,516	$ 4,790	$ 27,574
Concentration risk, percentage	8%	1%	4%
Customer concentration risk | Local Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Gross receivables	$ 16,197	$ 11,923
Concentration risk, percentage	10%	9%
Customer concentration risk | Local Governments | Contract revenues
Concentration Risk [Line Items]
Number of customers exceeding the 10% benchmark percentage | customer			1
Contract revenues	$ 125,015	$ 120,311	$ 202,839
Concentration risk, percentage	17%	20%	29%
Customer concentration risk | Local Governments | Contract revenues | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage			11.40%
Customer concentration risk | Private Companies | Trade and contract retainage receivables
Concentration Risk [Line Items]
Gross receivables	$ 134,317	$ 111,328
Concentration risk, percentage	85%	86%
Customer concentration risk | Private Companies | Contract revenues
Concentration Risk [Line Items]
Contract revenues	$ 480,675	$ 421,779	$ 427,736
Concentration risk, percentage	64%	70%	60%

Contracts in Progress (Details)

Contracts in Progress (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 1,251,853	$ 1,138,298
Estimated earnings	180,705	168,861
Costs incurred and estimated earnings on uncompleted contracts	1,432,558	1,307,159
Less: Billings to date	(1,426,375)	(1,305,628)
Costs and estimated earnings in excess of billings on uncompleted contracts, net	6,183	1,531
Contract assets	43,903	28,529
Contract liabilities	$ (37,720)	$ (26,998)

Contracts in Progress - Additio

Contracts in Progress - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract assets	$ 43,903	$ 28,529
Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts
Unbilled contract claims and change orders
Claims and unapproved change orders	$ 13,400	$ 3,800

Contracts in Progress - Remaini

Contracts in Progress - Remaining Performance Obligation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Performance obligations expected to be satisfied	$ 448.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Performance obligations expected to be satisfied	$ 396.2
Performance obligations expected to be satisfied, percentage	88%
Performance obligations expected to be satisfied, expected timing	12 months

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Property, plant and equipment, gross	$ 268,224	$ 263,804
Less: accumulated depreciation	(195,948)	(191,542)
Property, plant and equipment net book value of depreciable assets	72,276	72,262
Property and equipment, net of depreciation	100,977	106,654
Automobiles and trucks
Property, Plant and Equipment
Property, plant and equipment, gross	2,232	2,337
Building and improvements
Property, Plant and Equipment
Property, plant and equipment, gross	36,952	34,796
Construction equipment
Property, Plant and Equipment
Property, plant and equipment, gross	130,660	137,786
Vessels and other equipment
Property, Plant and Equipment
Property, plant and equipment, gross	91,495	82,455
Office equipment
Property, Plant and Equipment
Property, plant and equipment, gross	6,885	6,430
Construction in progress
Property, Plant and Equipment
Property, plant and equipment, gross	816	6,507
Land
Property, Plant and Equipment
Property, plant and equipment, gross	$ 27,885	$ 27,885

Property and Equipment Narrativ

Property and Equipment Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property and Equipment
Depreciation expense	$ 19,700	$ 21,100	$ 21,800
Gain on disposal of assets	$ 4,970	11,418	$ 9,044
Property, Tampa Bay FL
Property and Equipment
Gain on disposal of assets		$ 6,700

Other Current Accounts Receiv_3

Other Current Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other Current Accounts Receivable
Insurance claims receivable		$ 13,273
Accident loss receivables	$ 1,328	3,760
Vendor receivables	807	118
Purchase incentive receivable	695
Bond premium dividend receivable	391	385
Other current accounts receivable	305	49
Total other current accounts receivable	$ 3,526	$ 17,585

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	$ 1,811	$ 2,813
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	1,811	2,813
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	$ 0	$ 0

Fair Value - Other Fair Value M

Fair Value - Other Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Concrete Segment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life Insurance, face amount	$ 11.1
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$ 35.7	$ 39.4

Intangible Assets - Finite-live

Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-lived Intangible Assets
Finite-lived intangible assets, beginning of period	$ 35,240	$ 35,240
Additions	0
Total finite-lived intangible assets, end of period	35,240	35,240	$ 35,240
Accumulated Amortization
Accumulated amortization, beginning of period	(33,576)	(32,055)
Current year amortization	(1,239)	(1,521)	(2,070)
Total accumulated amortization	(34,815)	(33,576)	$ (32,055)
Net intangible assets
Net finite-lived intangible assets, end of period	425	1,664
Infinite-lived intangible assets	6,892	6,892
Total net intangible assets	$ 7,317	$ 8,556

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Business Acquisition [Line Items]
Amortization expense	$ 1,239	$ 1,521	$ 2,070
Trade Names
Business Acquisition [Line Items]
Impairment of infinite-lived assets	0	0
Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired				$ 18,800
Acquired finite-lived intangible assets, useful life				8 years
Amortization expense	$ 1,200	$ 1,500	$ 2,100

Intangible Assets - Future Amor

Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 388
2024	37
Net finite-lived intangible assets, end of period	$ 425	$ 1,664

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accrued Liabilities, Current [Abstract]
Accrued salaries, wages and benefits	$ 7,605	$ 9,879
Accrued liabilities expected to be covered by insurance	5,757	19,818
Sales taxes	1,737	5,113
Property taxes	522	1,047
Sale-leaseback arrangement	813	743
Accounting and audit fees	222	413
Interest	60	23
Other accrued expenses	1,750	1,558
Total accrued liabilities	$ 18,466	$ 38,594

Debt - Obligations under Debt A

Debt - Obligations under Debt Arrangements (Details) - USD ($) $ in Thousands	Mar. 01, 2022	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal current		$ 35,283	$ 39,141
Principal, long-term		716	259
Principal		35,999	39,400
Deferred Issuance Costs, current		(327)
Debt Issuance Costs, Net, Total		(327)
Net Value, current		34,956	39,141
Net Value, long-term		716	259
Total debt		$ 35,672	39,400
Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate		6.23%
Other Debt
Debt Instrument [Line Items]
Principal amount		$ 1,000
Principal current		283	141
Principal, long-term		716	259
Net Value, current		283	141
Net Value, long-term		716	259
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		42,500
Principal current		35,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Principal current		35,000	39,000
Deferred Issuance Costs, current		(327)
Net Value, current		$ 34,673	$ 39,000
Ninth Amendment to Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 42,500
Debt issuance cost	$ 1,000

Debt - Provisions of Revolving

Debt - Provisions of Revolving Line of Credit (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Repayments of debt	$ 28,274,000	$ 49,120,000	$ 48,204,000
Proceeds from lines of credit	24,000,000	$ 53,000,000	$ 10,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	42,500,000
Minimum borrowing increment amount	1,000,000
Increment borrowing multiple for amounts borrowed in excess of minimum borrowing amount	250,000
Amount outstanding	35,000,000
Remaining borrowing capacity	6,000,000
Repayments of debt	28,000,000
Decrease in debt balance	4,000,000
Proceeds from lines of credit	24,000,000
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	20,000,000
Letters of credit outstanding	1,500,000
Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	5,000,000
Minimum borrowing increment amount	250,000
Increment borrowing multiple for amounts borrowed in excess of minimum borrowing amount	$ 50,000

Debt - Financial covenants (Det

Debt - Financial covenants (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022
Debt Disclosure [Abstract]
Covenant compliance, Leverage Ratio, maximum	3
Covenant compliance, Fixed Charge Coverage Ratio, minimum	1.25
Fixed charge coverage ratio		1.76
Consolidated leverage ratio		2.38

Other Long-Term Liabilities - C

Other Long-Term Liabilities - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other long-term liabilities
Sale-leaseback arrangement	$ 15,156	$ 15,969
Deferred compensation	1,639	2,759
Accrued liabilities expected to be covered by insurance	277	214
Total other long-term liabilities	$ 17,072	$ 18,942

Other Long-Term Liabilities - S

Other Long-Term Liabilities - Sale-Leaseback (Details) $ in Millions	Sep. 27, 2019 USD ($) Options
Failed Sale Leaseback
Paydown of Term loan	$ 18.2
Failed Sale Leaseback
Failed Sale Leaseback
Sale price of properties sold	$ 19.1
Lease term	15 years
Annual rent	$ 1.5
Annual percentage rent increase	2%
Number of consecutive options to extend term | Options	2
Term of available options	10 years

Income Taxes - Components of In

Income Taxes - Components of Income Tax (Benefit) Expense by Jurisdiction and by Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
State and local
Current	$ 449	$ 243	$ 589
Deferred	(29)	(20)	13
Total	420	223	602
Foreign
Current	(34)	268	1,370
Deferred	43	11	4
Total	9	279	1,374
Total Income Taxes
Current	415	511	1,959
Deferred	14	(9)	17
Total	$ 429	$ 502	$ 1,976

Income Taxes - Effective Income

Income Taxes - Effective Income Tax (Benefit) Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory amount	$ (2,558)	$ (2,952)	$ 4,662
Valuation allowance on foreign tax credits	(136)	186	1,344
State income tax, net of federal benefit	251	44	792
Permanent differences, other	185	303	558
Permanent differences, stock compensation	217	(262)	328
Valuation allowance, other	2,251	3,108	(5,795)
Other	219	75	87
Income tax (benefit) expense	$ 429	$ 502	$ 1,976
Effective income tax rate	(3.50%)	(3.60%)	8.90%
Federal statutory tax rate	21%	21%	21%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets related to:
Accrued liabilities	$ 1,320	$ 1,568
Intangible assets	2,161	2,510
Net operating loss carryforward	16,699	11,966
Stock-based compensation	276	326
Foreign tax credits	3,831	3,968
Goodwill	4,328	5,249
Leases	9,018	8,772
Other	2,301	2,040
Total gross deferred tax assets	39,934	36,399
Less valuation allowance	(17,557)	(15,443)
Total net deferred tax assets	22,377	20,956
Liabilities related to:
Depreciation and amortization	(22,362)	(20,700)
Other	(156)	(384)
Total deferred tax liabilities	(22,518)	(21,084)
Net deferred tax liabilities	$ (141)	$ (128)

Income Taxes - Net Operating Lo

Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating loss carryforwards
Valuation allowance	$ 17,557	$ 15,443
Change in valuation allowance	2,200
Foreign tax credits	$ 3,831	$ 3,968
Percentage of taxable income	80%
Period of foreign tax credit carryforwards	10 years
Federal
Operating loss carryforwards
Net operating loss carryforwards	$ 51,300
State
Operating loss carryforwards
Net operating loss carryforwards	$ 132,000

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances at beginning of the year	$ 1,614	$ 1,614
Additions based on tax position related to current year
Balance at end of the year	1,614	1,614
Accrued interest and penalties on unrecognized tax benefits	$ 0	$ 0	$ 0

Earnings (Loss) Per Share - Ant

Earnings (Loss) Per Share - Anti-dilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Potential antidilutive securities excluded from computations of earnings per share	490,678	831,077	1,159,440

Earnings (Loss) Per Share - Bas

Earnings (Loss) Per Share - Basic and Diluted (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic:
Weighted average shares outstanding, basic	31,402,328	30,763,527	30,122,362
Effect of dilutive securities:
Common stock options	0	0	0
Total weighted average shares outstanding assuming dilution	31,402,328	30,763,527	30,122,362

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended																12 Months Ended
	Mar. 31, 2023 shares	Nov. 30, 2022 $ / shares shares	Sep. 30, 2022 $ / shares shares	Aug. 31, 2022 $ / shares shares	May 31, 2022 director $ / shares shares	Jan. 31, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Sep. 30, 2021 $ / shares shares	Aug. 31, 2021 $ / shares shares	May 31, 2021 director $ / shares shares	Dec. 31, 2020 $ / shares shares	Sep. 30, 2020 $ / shares shares	Aug. 31, 2020 $ / shares shares	May 31, 2020 director $ / shares shares	Mar. 31, 2020 $ / shares shares	Feb. 29, 2020 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation
Compensation expense related to stock based awards outstanding | $																	$ 2,800	$ 2,400	$ 2,000
Payments related to tax withholding for stock-based compensation | $																	440	949	188
Proceeds received upon exercise of stock options | $																		$ 110
Exercise of stock options, shares																		28,546
Total share-based compensation cost not yet recognized | $																	$ 3,100
Share-based compensation cost not yet recognized, period for recognition																	2 years 3 months 18 days
Total intrinsic value of options exercised | $																		$ 50
Total fair value of shares vested | $																		93	329
Certain Officers
Share-based Compensation
Payments related to tax withholding for stock-based compensation | $																	$ 400	900	$ 200
Stock options
Share-based Compensation
Forfeiture rate applied to awards																	5.50%
Proceeds received upon exercise of stock options | $																		$ 100
Exercise of stock options, shares																	0	28,546	0
Restricted stock and performance units | Certain Executive
Share-based Compensation
Grant date fair value (in dollars per share) | $ / shares			$ 2.75	$ 2.69
Restricted stock
Share-based Compensation
Awards granted in period (in shares)																	1,603,434	916,531	1,038,044
Grant date fair value (in dollars per share) | $ / shares																	$ 2.73	$ 4.58	$ 2.76
Forfeiture rate applied to awards																	3.20%
Restricted stock | Independent Directors and Executive Chairman, Interim CEO and Interim CFO
Share-based Compensation
Awards granted in period (in shares)					623,655
Grant date fair value (in dollars per share) | $ / shares					$ 2.79
Restricted stock | Independent Directors
Share-based Compensation
Number of independent directors receiving awards | director					6					6				6
Awards granted in period (in shares)					193,548	8,929		18,215		14,975				39,823
Grant date fair value (in dollars per share) | $ / shares						$ 3.36		$ 5.49		$ 6.01				$ 2.26
Restricted stock | Officers And Executives
Share-based Compensation
Vesting period							3 years			3 years	3 years			3 years	3 years
Awards granted in period (in shares)							139,000			160,000	95,000			100,000	170,235
Grant date fair value (in dollars per share) | $ / shares							$ 3.75			$ 6.01	$ 4.92			$ 2.26	$ 3.73
Restricted stock | Certain Executive
Share-based Compensation
Vesting period			3 years	3 years				3 years				3 years
Awards granted in period (in shares)		64,935	130,909	446,097				9,901				25,000				15,121
Grant date fair value (in dollars per share) | $ / shares		$ 2.31										$ 2.58				$ 4.96
Weighted average grant-date fair value of options granted (in USD per share) | $ / shares								$ 5.05
Time-vested restricted stock units | Executive Chairman, Interim CEO and Interim CFO
Share-based Compensation
Awards granted in period (in shares)					430,107
Time-vested restricted stock units | Vesting when Interim CEO term is fulfilled | Executive Chairman, Interim CEO and Interim CFO
Share-based Compensation
Number of shares vested			179,211
Time-vested restricted stock units | Vesting when Executive Chairman term is fulfilled | Executive Chairman, Interim CEO and Interim CFO
Share-based Compensation
Number of shares vested	250,896
Performance Units | Certain Executive
Share-based Compensation
Vesting percentage			100%	100%					50%	100%			50%	50%
Shares earned based on achievement of objective, percent														100%
Vesting period			3 years	3 years						3 years
Awards granted in period (in shares)			87,273	241,636					259,565	240,000				300,000
Grant date fair value (in dollars per share) | $ / shares									$ 2.26	$ 6.01			$ 1.96	$ 2.26
Performance period									1 year				1 year	1 year
Granted (in shares)													93,750
Performance Units | Vesting on First and Second Anniversary of Determination | Certain Executive
Share-based Compensation
Vesting percentage									25%				25%
Performance Units | Vesting on Second and Third Anniversary of Determination | Certain Executive
Share-based Compensation
Vesting percentage														25%
2022 LTIP | Maximum
Share-based Compensation
Approved and authorized maximum number of shares to be issued					2,175,000
2022 LTIP | Stock options
Share-based Compensation
Expiration period					10 years
2022 LTIP | Stock options | Minimum
Share-based Compensation
Vesting period					3 years
2022 LTIP | Stock options | Maximum
Share-based Compensation
Vesting period					5 years

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Activity (Details) - Restricted stock - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Beginning nonvested shares (in shares)	942,059	950,436	516,572
Granted (in shares)	1,603,434	916,531	1,038,044
Vested (in shares)	(806,241)	(690,676)	(496,797)
Forfeited/repurchased shares (in shares)	(382,480)	(234,232)	(107,383)
Ending nonvested shares (in shares)	1,356,772	942,059	950,436
Weighted Average Fair Value Per Share
Beginning nonvested shares (in dollars per share)	$ 3.97	$ 3.04	$ 4.29
Granted (in dollars per share)	2.73	4.58	2.76
Vested (in dollars per share)	2.90	3.43	2.87
Forfeited/repurchased shares (in dollars per share)	4.60	4.22	7.13
Ending nonvested shares (in dollars per share)	$ 2.96	$ 3.97	$ 3.04

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Beginning stock options outstanding (in shares)	724,704	922,615	1,464,766
Exercised (in shares)		(28,546)
Forfeited (in shares)	(421,375)	(169,365)	(542,151)
Ending stock options outstanding (in shares)	303,329	724,704	922,615
Weighted Average Exercise Price Per Share
Beginning stock options outstanding (in dollars per share)	$ 7.41	$ 7.10	$ 7.41
Exercised (in dollars per share)		3.86
Forfeited (in dollars per share)	7.49	6.32	7.94
Ending stock options outstanding (in dollars per share)	$ 7.29	$ 7.41	$ 7.10
Vested and expected to vest at December 31, 2022
Number of Shares	303,329
Weighted Average Exercise Price Per Share (in dollars per share)	$ 7.29
Weighted Average Contractual Life	3 years 2 months 4 days
Exercisable at December 31, 2022
Number of Shares	303,329
Weighted Average Exercise Price Per Share (in dollars per share)	$ 7.29
Weighted Average Contractual Life	3 years 2 months 4 days

Employee Benefits - Narrative (

Employee Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan Disclosure
Minimum service period for plan eligibility	6 months
Minimum allowable contribution to the plan by each employee, percent	1%
Maximum allowable contribution to the plan by each employee, percent	80%
Employers matching contribution, vesting period	4 years
Company contributions to the plan	$ 1.4	$ 1.4	$ 1.2
Range 1
Defined Contribution Plan Disclosure
Employer matching contribution, percent	100%
Employer matching contribution, percent of employees' gross pay	2%
Range 2
Defined Contribution Plan Disclosure
Employer matching contribution, percent	50%
Employer matching contribution, percent of employees' gross pay	2%
AGC Southwest Chapters 401(k) Retirement Plan
Defined Contribution Plan Disclosure
Employer matching contribution, percent	50%
Employers matching contribution, vesting period	5 years
Employer matching contribution, percent of employees' gross pay	6%
Employer discretionary contribution amount	$ 1	$ 0.9	$ 0.1

Employee Benefits - Multiemploy

Employee Benefits - Multiemployer Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 1,289	$ 1,297	$ 2,480
Washington Laborers
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 106	$ 244	236
Carpenters Retirement Plan of Western Washington
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 1,717	$ 1,700	1,898
Cement Masons & Plasterers Trust Funds
Multiemployer Plans [Line Items]
Certified Zone Status		Green
Contributions		$ 32	39
Western Conference of Teamsters Pension Trust Fund
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 44	$ 44	15
Alaska Carpenters Trust Fund
Multiemployer Plans [Line Items]
Contributions			271
Alaska Laborers Trust Fund
Multiemployer Plans [Line Items]
Contributions			$ 226

Segment Information (Details)

Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($) segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2	2	2
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Operating income (loss)	(8,030)	(9,317)	26,586
Depreciation and amortization	(20,915)	(22,608)	(23,893)
Assets	367,155	351,750
Property and equipment, net of depreciation	100,977	106,654
Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	339,213	263,915	388,173
Marine Segment | Mexico and the Caribbean
Segment Reporting Information [Line Items]
Contract revenues	6,700	2,900
Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	409,109	337,445	321,769
Concrete Segment | Foreign
Segment Reporting Information [Line Items]
Contract revenues	0	0
Operating Segments | Marine Segment
Segment Reporting Information [Line Items]
Contract revenues	339,213	263,915	388,173
Operating income (loss)	9,787	5,760	29,815
Depreciation and amortization	(16,592)	(17,287)	(18,369)
Assets	239,369	236,773
Property and equipment, net of depreciation	91,390	93,383
Operating Segments | Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues	409,109	337,445	321,769
Operating income (loss)	(17,817)	(15,077)	(3,229)
Depreciation and amortization	(7,465)	(8,143)	$ (8,848)
Assets	127,786	114,977
Property and equipment, net of depreciation	9,587	13,271
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues	$ 200
Intersegment Eliminations | Maximum
Segment Reporting Information [Line Items]
Contract revenues		$ 100

Leases - Assets and Liabilities

Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease right-of-use assets, net of amortization	$ 14,978	$ 14,686
Financing lease right-of-use assets, net of amortization	15,839	14,561
Total assets	30,817	29,247
Current portion of operating lease liabilities	4,738	3,857
Current portion of financing lease liabilities	4,031	3,406
Total current	8,769	7,263
Operating lease liabilities	11,018	11,637
Financing lease liabilities	11,102	10,908
Total noncurrent	22,120	22,545
Total liabilities	30,889	29,808
Operating lease, right-of-use asset, accumulated amortization	10,500	9,500
Finance lease, right-of-use asset, accumulated amortization	$ 5,100	$ 2,700

Leases - Term and Discount Rate

Leases - Term and Discount Rate (Details)	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Weighted Average Remaining Lease Term, operating lease	3 years 10 months 24 days	4 years 10 months 24 days
Weighted Average Remaining Lease Term, finance lease	4 years 4 months 9 days	4 years 8 months 12 days
Weighted Average Discount Rate, operating lease	4.86%	4.75%
Weighted Average Discount Rate, finance lease	5.62%	4.28%

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 5,012	$ 5,814	$ 6,430
Short-term lease cost	1,754	1,607	3,871
Interest on lease liabilities	767	491	548
Amortization of right-of-use assets	3,142	2,822	3,324
Total lease cost	$ 10,675	$ 10,734	$ 14,173

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 4,966	$ 5,666	$ 6,262
Operating cash flows for finance leases	767	491	548
Financing cash flows for finance leases	2,992	3,035	3,619
ROU assets obtained in exchange for new operating lease liabilities	6,740	1,567	7,829
ROU assets obtained in exchange for new financing lease liabilities	$ 9,368	$ 7,318	$ 11,270

Leases - Maturities (Details)

Leases - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Operating Leases
2023	$ 5,386
2024	4,628
2025	3,185
2026	1,770
2027	1,704
Thereafter	656
Total future minimum lease payments	17,329
Less - amount representing interest	1,573
Operating Lease, Liability, Total	15,756
Less - current lease obligations	4,738	$ 3,857
Long-term lease obligations	11,018	11,637
Finance Leases
2023	4,322
2024	4,436
2025	3,307
2026	1,815
2027	1,529
Thereafter	1,583
Total future minimum lease payments	16,992
Less - amount representing interest	1,859
Present value of future minimum lease payments	15,133
Less - current lease obligations	4,031	3,406
Long-term lease obligations	$ 11,102	$ 10,908

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent event - United States Navy [Member] $ in Millions	Mar. 10, 2023 USD ($)
Subsequent event
Contract awarded	$ 448
Dragados/Hawaiian Dredging/Orion Joint Venture
Subsequent event
Contract awarded	$ 2,800

Schedule II - Valuation And Q_2

Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Provision for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	$ 323	$ 411	$ 2,600
Charged to Revenue, Cost or Expense	322	0	(487)
Deduction	39	88	1,702
Balance at the End of the Period	606	323	411
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	15,443	12,493	16,960
Charged to Revenue, Cost or Expense	2,114	3,294	(4,587)
Deduction	0	344	(120)
Balance at the End of the Period	17,557	15,443	12,493
Reserve for losses on uncompleted contracts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	34	1,473	10,925
Charged to Revenue, Cost or Expense	351	33	543
Deduction	32	1,472	9,995
Balance at the End of the Period	$ 353	$ 34	$ 1,473