Orion (ORN) 10-K 27 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 15, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	ORION GROUP HOLDINGS INC.
Entity Central Index Key	0001402829
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		28,899,412
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 237.2

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 8,684	$ 9,086
Accounts receivable:
Trade, net of allowance of $4,280 and $0, respectively	77,641	84,953
Retainage	30,734	39,189
Other current	4,257	3,706
Income taxes receivable	467	339
Inventory	1,056	4,386
Deferred tax asset	0	0
Costs and estimated earnings in excess of billings on uncompleted contracts	9,217	46,006
Prepaid expenses and other	5,000	4,124
Total current assets	137,056	191,789
Property and equipment, net	148,003	146,278
Inventory, non-current	7,598	4,915
Goodwill	0	69,483
Intangible assets, net of amortization	14,787	18,175
Other non-current	5,426	2,645
Total assets	312,870	433,285
Current liabilities:
Current debt, net of debt issuance costs	2,946	22,756
Accounts payable:
Trade	42,023	45,194
Retainage	736	1,990
Accrued liabilities	18,840	17,873
Taxes payable	0	256
Billings in excess of costs and estimated earnings on uncompleted contracts	21,761	33,923
Total current liabilities	86,306	121,992
Long-term debt, net of debt issuance costs	76,119	63,185
Other long-term liabilities	8,759	3,573
Deferred income taxes	49	13,243
Interest rate swap liability	52	26
Total liabilities	171,285	202,019
Stockholders’ equity:
Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued	0	0
Other comprehensive loss	(52)	(26)
Common stock -- $0.01 par value, 50,000,000 authorized, 29,611,989 and 28,860,961 issued; 28,900,758 and 28,149,737 outstanding at December 31, 2018 and December 31, 2017, respectively	296	288
Treasury stock, 711,231 and 711,231 shares, at cost December 31, 2018 and December 31, 2017, respectively	(6,540)	(6,540)
Additional paid-in capital	179,742	174,697
Retained earnings	(31,861)	62,847
Total stockholders’ equity	141,585	231,266
Total liabilities and stockholders’ equity	$ 312,870	$ 433,285

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Allowance for doubtful accounts	$ 4,280	$ 0
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	29,611,989	28,860,961
Common stock, shares outstanding	28,900,758	28,149,737
Treasury stock, shares	(711,231)	(711,231)

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Contract revenues	$ 520,894	$ 578,553	$ 578,236
Costs of contract revenues	499,245	511,663	510,754
Gross profit	21,649	66,890	67,482
Selling, general and administrative expenses	61,460	66,026	64,987
Gain from sale of assets, net	(3,306)	(674)	(1,579)
Goodwill impairment charges	69,483	0	0
Other gain from continuing operations	(5,448)	0	0
Operating (loss) income	(100,540)	1,538	4,074
Other (expense) income:
Gain from sale of assets, net	3,306	674	1,579
Other income	1,692	41	59
Interest income	136	11	3
Interest expense	(7,943)	(5,731)	(6,175)
Other (expense) income, net	(6,115)	(5,679)	(6,113)
Loss before income taxes	(106,655)	(4,141)	(2,039)
Income tax (benefit) expense	(12,233)	(4,541)	1,581
Net (loss) income	$ (94,422)	$ 400	$ (3,620)
Basic income (loss) per share (USD per share)	$ (3.31)	$ 0.01	$ (0.13)
Diluted income (loss) per share (USD per share)	$ (3.31)	$ 0.01	$ (0.13)
Shares used to compute (loss) income per share
Basic (in shares)	28,518,353	28,029,936	27,536,967
Diluted (in shares)	28,518,353	28,354,280	27,536,967

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (94,422)	$ 400	$ (3,620)
Change in fair value of cash flow hedge, net of tax benefit of $15, net of tax expense of $53, and net of tax expense of $25 for the years ended December 31, 2018, 2017 and 2016, respectively	(26)	356	(237)
Total comprehensive (loss) income	$ (94,448)	$ 756	$ (3,857)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Change in fair value of cash flow hedge, net of tax	$ (15)	$ 53	$ 25

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Other Comprehensive Income (Loss)	Additional Paid-In Capital	Retained Earnings
Beginning balance, shares at Dec. 31, 2015		27,992,589
Beginning balance at Dec. 31, 2015	$ 227,714	$ 279	$ (6,540)	$ (145)	$ 168,736	$ 65,384
Beginning treasury stock, shares at Dec. 31, 2015			(711,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 2,280				2,280
Exercise of stock options, shares	13,850	13,850
Exercise of stock options	$ 67	$ 0			67
Issue restricted stock, shares		407,002
Issuance of restricted stock	0	$ 4			(4)
Cash flow hedge, net of tax	(237)			(237)
Forfeiture of restricted stock		7,591
Net (loss) income	(3,620)					(3,620)
Ending balance, shares at Dec. 31, 2016		28,405,850
Ending balance at Dec. 31, 2016	226,204	$ 283	$ (6,540)	(382)	171,079	61,764
Ending treasury stock, shares at Dec. 31, 2016			(711,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,303				2,303
Deferred tax adjustment | Accounting Standards Update 2014-09	$ 683					683
Exercise of stock options, shares	229,551	229,551
Exercise of stock options	$ 1,320	$ 2			1,318
Issue restricted stock, shares		345,913
Issuance of restricted stock	0	$ 3			(3)
Cash flow hedge, net of tax	356			356
Forfeiture of restricted stock		(120,353)
Net (loss) income	$ 400					400
Ending balance, shares at Dec. 31, 2017	28,860,961	28,860,961
Ending balance at Dec. 31, 2017	$ 231,266	$ 288	$ (6,540)	(26)	174,697	62,847
Ending treasury stock, shares at Dec. 31, 2017	(711,231)		(711,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 2,238				2,238
Exercise of stock options, shares	488,303	488,303
Exercise of stock options	$ 2,815	$ 5			2,810
Issue restricted stock, shares		333,864
Issuance of restricted stock	0	$ 3			(3)
Cash flow hedge, net of tax	(26)			(26)
Forfeiture of restricted stock		(71,139)
Net (loss) income	$ (94,422)					(94,422)
Ending balance, shares at Dec. 31, 2018	29,611,989	29,611,989
Ending balance at Dec. 31, 2018	$ 141,585	$ 296	$ (6,540)	$ (52)	$ 179,742	$ (31,861)
Ending treasury stock, shares at Dec. 31, 2018	(711,231)		(711,231)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net (loss) income	$ (94,422)	$ 400	$ (3,620)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	31,799	29,491	34,162
Unamortized Debt Issuance Costs On Debt Extinguishment	2,164	0	0
Deferred financing cost amortization	725	1,269	1,225
Deferred income taxes	(13,194)	(4,166)	751
Stock-based compensation	2,238	2,303	2,280
Gain on sale of property and equipment	(3,306)	(674)	(1,579)
Goodwill impairment charges	69,483	0	0
Allowance for doubtful accounts	4,280	0	0
Other gain from continuing operations	(5,448)	0	0
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	10,936	15,022	(23,935)
Income tax receivable	(128)	(952)	(49)
Inventory	647	89	1,696
Accounts receivable, non-current	0	0	(511)
Prepaid expenses and other	1,671	(226)	856
Costs and estimated earnings in excess of billings on uncompleted contracts	36,789	(6,030)	19,640
Accounts payable	(4,584)	(5,666)	(5,717)
Accrued liabilities	(5,301)	(1,519)	(1,123)
Income tax payable	(256)	(433)	(125)
Billings in excess of costs and estimated earnings on uncompleted contracts	(12,162)	5,225	(802)
Net cash provided by operating activities	21,931	34,133	23,149
Cash flows from investing activities:
Proceeds from sale of property and equipment	3,234	6,826	2,152
Purchase of property and equipment	(17,714)	(10,729)	(18,715)
Acquisition of TAS and purchase price adjustment	0	0	(369)
Acquisition of TBC	0	6,000	0
TBC acquisition adjustment	0	(557)	0
Proceeds from return of investment	94	0	0
Insurance claim proceeds related to property and equipment	1,346	925	0
Contributions to CSV life insurance	260	545	754
Net cash used in investing activities	(13,300)	(10,080)	(17,686)
Cash flows from financing activities:
Borrowings from Credit Facility	39,861	72,000	57,000
Payments made on borrowings from Credit Facility	(48,111)	(87,813)	(63,084)
Loan costs from Credit Facility	(861)	(779)	(486)
Capital lease liability	(2,737)	0	0
Exercise of stock options	2,815	1,320	67
Net cash used in financing activities	(9,033)	(15,272)	(6,503)
Net change in cash and cash equivalents	(402)	8,781	(1,040)
Cash and cash equivalents at beginning of year	9,086	305	1,345
Cash and cash equivalents at end of year	8,684	9,086	305
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	4,819	4,413	5,031
Taxes, net of refunds	903	1,008	999
Capital lease expenditures included in accrued expenses	$ 13,103	$ 0	$ 0

Description of Business and Bas

Description of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation 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 pour and finish, dirt work, layout, forming, rebar, and mesh across the light 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 Marine Group 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 it complies with regulatory environments 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. This segment complies with regulatory environments 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 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. All intercompany balances and transactions have been eliminated in consolidation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Principles	Summary of Significant Accounting Principles 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; • Accounts receivable and allowance for doubtful accounts; • Goodwill and other long-lived assets, testing for indicators of impairment; • Income taxes; • Self-insurance; and • Stock based compensation. Revenue Recognition The Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), on January 1, 2018, using the modified retrospective method. The Company recognized the cumulative effect of initially adopting Topic 606 guidance as an adjustment to the beginning balance of retained earnings. Contracts with customers that were not substantially complete in both the Company’s marine and concrete segments were evaluated in order to determine the impact as of the date of adoption. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. 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 short in duration and usually span a period of less than one year. The Company determines the appropriate accounting treatment for each contract before work begins and generally records revenue on contracts 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. The Company's contracts and related change orders typically represent a single performance obligation because individual goods and services are not separately identifiable and the Company provides a significant integrated service. Revenue is recognized over time because control is continuously transferred to the customer. 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 incurring 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 losses on uncompleted contracts are anticipated, the entire loss is recognized 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 the most likely amount to which it expects to be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative recognized revenue will not occur. As of December 31, 2018 , approximately $1.1 million of claims against customers has been recognized and is reflected on the Company's Consolidated Balance Sheet under "Costs and estimated earnings in excess of billings on uncompleted contracts." The Company believes collection of these claims is probable, although the full amount of the recorded claims may not be collected. Contract assets and liabilities include the following: • Accounts Receivable: Trade, net of allowance - Represent amounts billed and currently due from customers and are stated at their net estimated realizable value. • Accounts Receivable: Retainage - Represent amounts which have not been billed to customers or paid pursuant to retainage provisions in construction contracts, which generally become payable upon contract completion and acceptance by the customer. • Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts - 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 (i.e. Contract Assets) and are recorded as a current asset. • Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts - Represent billings in excess of revenues recognized (i.e. Contract Liabilities) and are recorded as a current liability. The Company’s evaluation of its construction contracts under the new standard focused on the following areas which have the most significant impact on the amount and timing of revenue recognized: • Performance Obligations - Construction contracts with customers, including those related to contract modifications, were reviewed to determine if there were any multiple performance obligations. Based on our review, a limited number of contracts in the marine segment and no contracts in the concrete segment were identified as having multiple performance obligations. The net impact on retained earnings as of January 1, 2018 and gross profit for the year ended December 31, 2018 were not material. • Upfront Costs - These costs were required to be capitalized as assets and were recorded as part of "Costs and estimated earnings in excess of billings on uncompleted contracts" in the Company’s Consolidated Balance Sheets and amortized over the expected duration of the contract as part of "Costs of contract revenues" in the Company’s Consolidated Statements of Operations. If the expected completion date of the contract changes, the amortization period will be recalculated and adjusted prospectively. The amortization of such costs for the Company are generally comprised of initial costs incurred to mobilize equipment and labor to a job site or other upfront costs such as bonds or insurance prior to the "notice-to-proceed" date, which had been expensed as incurred in prior periods. Based on the Company's review, certain contracts in the marine segment were identified as having material upfront costs. The Company also reviewed contracts for the concrete segment and while certain contracts within the segment were identified as having upfront costs, they were not considered material. The following table summarizes the cumulative effect of the changes made to the Company’s unaudited Consolidated Balance Sheet as of January 1, 2018 from the adoption of Topic 606: Balance at December 31, 2017 Adjustments Due to Topic 606 Balance at January 1, 2018 Assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 46,006 $ 1,383 $ 47,389 Liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 33,923 $ 1,745 $ 35,668 Deferred income taxes 13,243 (76 ) 13,167 Equity Retained earnings $ 62,847 $ (286 ) $ 62,561 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, 2018, the aggregate amount of the remaining performance obligations was approximately $440.4 million . Of this amount, the Company expects to recognize $414.0 million , or 94% , in the next 12 months and the remaining balance thereafter. The following tables summarize the impact of adopting Topic 606 on the Company’s Consolidated Balance Sheet as of December 31, 2018 and Statement of Operations for the year ended December 31, 2018: As Reported Balances Without Adoption of Topic 606 Effect of Change Higher (Lower) Assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 9,217 $ 10,040 $ (823 ) Liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 21,761 $ 22,886 $ (1,125 ) Deferred income taxes 49 (57 ) 106 Equity Retained earnings $ (31,861 ) $ (32,057 ) $ 196 As Reported Balances Without Adoption of Topic 606 Effect of Change Higher (Lower) Contract revenues $ 520,894 $ 519,769 $ 1,125 Cost of contract revenues 499,245 498,422 823 Gross profit 21,649 21,347 302 Income tax (benefit) expense (12,233 ) (12,339 ) 106 Net (loss) income $ (94,422 ) $ (94,618 ) $ 196 Basic (loss) income per share $ (3.31 ) $ (3.32 ) $ 0.01 Diluted (loss) income per share $ (3.31 ) $ (3.32 ) $ 0.01 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, 2018 and 2017 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, less allowances for doubtful accounts. The Company has significant investments in billed and unbilled receivables as of December 31, 2018 and 2017 . 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, which are included in costs in excess of billings, arise as revenues are recognized over time. Unbilled amounts on contracts represent recoverable costs and accrued profits not yet billed. Revenue associated with these billings is recorded net of any sales tax, if applicable. Past due balances over 90 days and other higher risk amounts are reviewed individually for collectability. In establishing an allowance for doubtful accounts, the Company evaluates its contract receivables and costs in excess of billings and thoroughly reviews historical collection experience, the financial condition of its customers, billing disputes and other factors. The Company writes off uncollectible accounts receivable against the allowance for doubtful accounts if it is determined that the amounts will not be collected or if a settlement is reached for an amount that is less than the carrying value. As of December 31, 2018 and 2017 , the Company had recorded an allowance for doubtful accounts of $4.3 million and none, 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, 2018 totaled $30.7 million , of which $3.2 million is expected to be collected beyond 2019. Retainage at December 31, 2017 totaled $39.2 million . 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 recorded, which could result in the recording of a loss. 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. Advertising expenses totaled $225,000 , $150,000 , and $178,000 in 2018 , 2017 and 2016 , respectively. 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 expenditure is considered probable and the amount can be reasonably estimated. The Company did not recognize any environmental liabilities as of December 31, 2018 or 2017 , respectively. 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 9 for more information regarding fair value determination. 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. Refer to Note 8 for more information regarding inventory. 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 to seven years until the next scheduled maintenance. 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 5 years Buildings and improvements 5 to 30 years Construction equipment 3 to 15 years Vessels and other equipment 1 to 15 years Office equipment 1 to 5 years The Company generally uses accelerated depreciation methods for tax purposes where appropriate. Dry-docking costs are capitalized and amortized using the straight-line method over a period ranging from three to 15 years. Dry-docking costs include, but are not limited to, the inspection, refurbishment and replacement of steel, engine components, tailshafts, mooring equipment and other parts of the vessel. Amortization related to dry-docking activities is included as a component of depreciation. These costs and the related amortization periods are periodically reviewed to 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 were no assets classified as held for sale as of December 31, 2018 or December 31, 2017. Goodwill and Other Intangible Assets Goodwill The Company has acquired businesses and assets in purchase transactions that resulted in the recognition of goodwill. Goodwill represents the costs in excess of fair values assigned to the identifiable assets acquired and liabilities assumed in the acquisition. In accordance with U.S. GAAP, acquired goodwill is not amortized, but is subject to impairment testing at least annually at a reporting unit level (as of October 31 of each year) or more frequently if events or circumstances indicate the asset may be impaired. The Company determined its operations comprise two reporting units for goodwill impairment testing, which match its two operating segments for financial reporting. The Company assesses the fair value of its reporting units based on a weighted average of valuations based on market multiples and discounted cash flows, as well as consideration of its market capitalization. The key assumptions used in the discounted cash flow valuations are discount rates, weighted average cost of capital and perpetual growth rates applied to cash flow projections. Also inherent in the discounted cash flow valuation models are past performance, projections and assumptions in current operating plans and revenue growth rates over the next five years. These assumptions contemplate business, market and overall economic conditions. Other considerations are assumptions that market participants may use in analysis of comparable companies. The underlying assumptions used for determining fair value, as discussed above, require significant judgment and are susceptible to change from period to period and could potentially cause a material impact to the income statement. In the future, the Company's estimated fair value could be negatively impacted by extended declines in its stock price, changes in macroeconomic indicators, sustained operating losses and other factors which may affect its assessment of fair value. As required, annual impairment testing of goodwill is performed as of October 31 of each year or whenever circumstances arise that indicate a possible impairment might exist. Based on this testing, we concluded that as of December 31, 2018, our Marine segment’s goodwill of $33.8 million and our Concrete segment’s goodwill of $35.7 million were fully impaired. See Note 10 for additional discussion of our goodwill and related goodwill impairment testing. 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 indefinite lives are not amortized, but are subject to impairment testing at least annually or more frequently if events or circumstances indicate the asset may be impaired. The Company has one indefinite-lived intangible asset, a trade name, which is tested for impairment annually on October 31, or whenever events or circumstances indicate 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 asset 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 10 for additional discussion of intangible assets and trade name impairment testing. 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 options granted is estimated on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model requires the use of subjective assumptions in the computation. Changes in these assumptions can cause significant fluctuations in the fair value of the option award. The fair value of restricted stock grants 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 share-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 for further discussion of the Company’s stock-based compensation plan. 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 assets and liabilities 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 the Company does not expect to realize. The factors used to assess the likelihood of realization include the Company's forecast of future taxable income exclusive of reversing temporary differences and carryforwards, future reversals of existing taxable temporary differences and available tax planning strategies that could be implemented to realize the net deferred tax assets. The Company considers both positive and negative evidence when evaluating the need for a valuation allowance on its deferred tax assets in accordance with ASC 740. Available evidence includes historical financial information supplemented by currently available information about future years. Generally, historical financial information is more objectively verifiable than projections of future income and is therefore given more weight in the assessment. The Company considers cumulative losses in the most recent twelve quarters to be significant negative evidence that is difficult to overcome in considering whether a valuation allowance is required. Conversely, the Company considers a cumulative income position over the most resent twelve quarters, to be significant positive evidence that a valuation allowance may not be required. 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 of the enactment date. The Company accounts for uncertain tax positions in accordance with the provisions of ASC 740-10 which prescribes a recognition threshold and measurement attribute for financial statement disclosure of tax positions taken, or expected to be taken, on its consolidated tax return. The Company evaluates and records any uncertain tax positions based on the amount that management deems is more likely than not to be sustained upon examination and ultimate settlement with the tax authorities in the tax jurisdictions in which it operates. See Note 13 for additional discussion of income taxes and the Tax Cuts and Jobs Act (the "Act"), which was enacted and signed into law on December 22, 2017. 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 Results 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 accrued liability for insurance includes incurred but not reported claims of $5.7 million and $5.2 million at December 31, 2018 and 2017 , respectively. Recent Accounting Pronouncements The FASB issues accounting standards and updates (each, an "ASU") from time to time to its ASC, which is the primary source of U.S. GAAP. The Company regularly monitors ASUs as they are issued and considers applicability to its business. All ASUs are adopted by their respective due dates and in the manner prescribed by the FASB. The following are those recently issued ASUs most likely to affect the presentation of the Company's consolidated financial statements: In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize lease assets (i.e. right-to-use assets) on the balance sheet. These are assets that represent the lessee's right to use or control the use of specified assets for the lease terms and lease liabilities, which are lessee's obligations to make lease payments arising from leases measured on a discounted basis, for all leases with terms longer than 12 months. Leases with terms of 12 months or less will be accounted for similar to existing guidance for operating leases. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company will adopt the new standard on January 1, 2019 using the optional transition method under ASU 2018-11 and elect the available practical expedients. This method allows the Company an option to allow transition of the new lease guidance at the effective date and recognize a cumulative-effect adjustment to the opening balance of retained earnings at the effective date. Under this method, the comparative periods presented in the financial statements prior to the adoption date would not be adjusted to apply ASC 842.The Company expects the adoption of ASC 842 to result in a material increase of approximately $20 million to $30 million to assets and liabilities on its consolidated balance sheets. The Company does not anticipate the adoption of ASC 842 to have a material effect on its consolidated statements of operations and statements of cash flows

Business Acquisition

Business Acquisition	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Acquisition	Business Acquisitions TBC Acquisition On April 9, 2017, T.A.S. Commercial Concrete Construction, LLC, a wholly owned subsidiary of Orion Group Holdings, Inc. ("the Company") entered into a Stock Purchase Agreement ("the Agreement") for the purchase of all the issued and outstanding shares (the "shares") of Tony Bagliore Concrete, Inc. ("TBC"), a Texas corporation. The Company and the two sole shareholders of TBC closed the purchase transactions on April 10, 2017 (the "Closing Date"). Upon the terms of and subject to the conditions set forth in the Agreement, the total aggregate consideration paid on the Closing Date by the Company to the Sellers for the shares was $6.0 million in cash. In addition however, if certain target considerations are met in future periods, an additional cash payment of up to $2.0 million will become payable to the Seller. The purpose of the acquisition was primarily to achieve growth by expanding the Company's current service offerings in addition to expansion into new markets. The tangible assets acquired include accounts receivable, retainage and fixed assets. Under the acquisition method of accounting, the total acquisition consideration is allocated to the acquired tangible and intangible assets and assumed liabilities of TBC based on their estimated fair values as of the closing of the acquisition. The table below outlines the total actual acquisition consideration allocated based on the preliminary fair values of TBC’s tangible and intangible assets and liabilities as of April 9, 2017: Accounts receivable $ 3,239 Retainage 1,860 Fixed assets, net 2,098 Other 9 Goodwill 2,562 Other intangible assets 878 Accounts payable (2,017 ) Accrued expenses and other current liabilities (1,080 ) Contingent consideration (456 ) Deferred tax liability (1,093 ) Total Acquisition Consideration at April 9, 2017 $ 6,000 Working capital adjustment (all attributable to Goodwill) 557 Total Acquisition Consideration $ 6,557 The excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed was allocated to goodwill. The goodwill of $3.1 million arising from the acquisition consists primarily of synergies and business opportunities expected to be realized from the purchase of TBC. The goodwill is not deductible for income tax purposes. Finite-lived intangible assets acquired include customer relationships and contractual backlog. (See Note 10 ). The fixed assets acquired include construction equipment as well as automobiles and trucks and will be depreciated in accordance with Company policy, generally three to 15 years. As stated in the Agreement, the Company has agreed to pay the sellers up to $2.0 million in cash, if earned, as additional purchase consideration. The seller's right to receive the contingent consideration, if any, shall be based on the Company's achievement of certain future financial targets. The Company measured the fair value of the contingent consideration at the Acquisition Date, and determined that fair value to be approximately $0.5 million , as shown in the table above. This amount of contingent liability is classified on the Consolidated Balance Sheets as other long-term liabilities. Pro Forma Results (unaudited) The results and operations of TBC have been included in the Consolidated Statements of Operations since the acquisition date of April 9, 2017. The Company has calculated the pro forma impact of the acquisition of TBC in our operating results for the twelve months ended December 31, 2016. Pro Forma Results For the Year Ended December 31, 2016 Contract revenues $ 610,695 Operating income from continuing operations $ 5,593 Net loss $ (2,677 ) Basic loss per share $ (0.10 ) Diluted loss per share $ (0.10 ) The Company derived the pro forma results of the acquisition based upon historical financial information obtained from the seller and certain management assumptions. The pro forma adjustments related to incremental amortization expense associated with the acquired finite-lived intangible assets and interest expense associated with borrowings to effect the transaction, assuming a January 1, 2016 effective transaction date. In addition, the tax impact of these adjustments was calculated at a 35% statutory rate. These pro forma results are not indicative of the results that would have been obtained had the acquisition of TBC been completed on January 1 of the respective period, or that may be obtained in the future.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue 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: 2018 Marine Segment Construction $ 156,925 Dredging 73,237 Specialty Services 13,721 Marine segment contract revenues $ 243,883 Concrete Segment Light Commercial $ 215,628 Structural 60,926 Other 457 Concrete segment contract revenues $ 277,011 Total contract revenues $ 520,894 Although the Company has disaggregated its contract revenues in terms of services provided, it believes its operations comprise two reportable segments pursuant to FASB ASC Topic 280, Segment Reporting . In making this determination, the Company considered the similar characteristics of its operations as discussed in Note 1 . Additionally, as discussed, both the marine and concrete segments have limited contracts with multiple performance obligations. The Company’s contracts often combine multiple services, such as engineering, dredging, diving and construction, into one distinct finished product which is transferred to the customer. These contracts are often estimated and bid as one project and evaluated on performance as one project, not by individual services performed by each. Both the marine and concrete segments have a single CODM for the entire segment, not by service lines of the segments. Resources are allocated by segment, and financial and budgetary information is compiled and reviewed by segment, not service line. 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 sidewalks, ramps, tilt walls and trenches. Other services comprise labor related to concrete pouring such as rebar installation and pumping services and typically support the segment's structural and light commercial services.

Concentration of Risk and Enter

Concentration of Risk and Enterprise Wide Disclosures	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Concentration of Risk and Enterprise Wide Disclosures	Concentration of Risk and Enterprise Wide Disclosures 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, 2018 and December 31, 2017 , respectively: December 31, 2018 December 31, 2017 Federal Government $ 2,319 2 % $ 3,509 3 % State Governments 916 1 % 4,503 3 % Local Governments 30,187 28 % 18,256 15 % Private Companies 74,953 69 % 97,874 79 % Total receivables $ 108,375 100 % $ 124,142 100 % At December 31, 2018 and 2017 , 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 year s ended December 31, 2018 , 2017 and 2016 . 2018 % 2017 % 2016 % Federal Government $ 42,143 8 % $ 63,823 11 % $ 40,361 7 % State Governments 30,470 6 % 42,613 7 % 37,700 7 % Local Governments 107,478 21 % 91,591 16 % 94,461 16 % Private Companies 340,803 65 % 380,526 66 % 405,714 70 % Total contract revenues $ 520,894 100 % $ 578,553 100 % $ 578,236 100 % In the year s ended December 31, 2018 , 2017 and 2016 , no single customer exceeded 10.0% of total contract revenues. The Company does not believe that the loss of any one of these 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. In addition, the concrete segment primarily purchases concrete from select suppliers. The loss of one of these suppliers could adversely impact short-term operations. Contract revenues generated outside the United States totaled 2.3% , 1.6% and 1.3% of total revenues for the years ended December 31, 2018 , 2017 and 2016 , respectively, and were primarily located in the Caribbean Basin and Mexico.

Contracts in Progress

Contracts in Progress	12 Months Ended
	Dec. 31, 2018
Contractors [Abstract]
Contracts in Progress	Contracts in Progress Contracts in progress are as follows at December 31, 2018 and December 31, 2017 : December 31, December 31, Costs incurred on uncompleted contracts $ 461,144 $ 668,848 Estimated earnings 73,170 120,751 534,314 789,599 Less: Billings to date (546,858 ) (777,516 ) $ (12,544 ) $ 12,083 Included in the accompanying consolidated balance sheets under the following captions: Costs and estimated earnings in excess of billings on uncompleted contracts 9,217 $ 46,006 Billings in excess of costs and estimated earnings on uncompleted contracts (21,761 ) (33,923 ) $ (12,544 ) $ 12,083 Included in cost and estimated earnings in excess of billings on uncompleted projects is approximately $1.1 million related to claims and unapproved change orders. See Note 2 - Summary of Significant Accounting Principles to the Company's consolidated financial statements for discussion of the accounting for these claims. Contract costs include all direct costs, such as materials 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. Incentive fees, if available, are billed to the customer based on the terms and conditions of the contract. Pending claims are recognized as an increase in contract revenue only when the collection is deemed probable and if the amount can be reasonably estimated for purposes of calculating total profit or loss on long-term contracts. Changes in job performance, job conditions and estimated profitability, including those arising from final contract settlements, may result in revisions to costs and revenues and are recognized in the period in which the revisions are determined. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined, without regard to the percentage of completion. During the year-ended December 31, 2018, we recognized unfavorable changes in our estimates on two construction projects in our Marine Segment. These changes were caused by prolonged weather delays, unforeseen access and other client-imposed restrictions that impacted our productivity. The result of these changes in estimates is reflected as a decrease in revenue of $22.8 million in the consolidated statement of operations for the year-ended December 31, 2018 and included in billings in excess of costs and estimated earnings on uncompleted contracts.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment The following is a summary of property and equipment at December 31, 2018 and December 31, 2017 : December 31, December 31, Automobiles and trucks $ 1,709 $ 1,940 Building and improvements 43,628 38,062 Construction equipment 161,113 166,203 Vessels and other equipment 90,217 85,113 Office equipment 8,061 8,039 304,728 299,357 Less: accumulated depreciation (195,373 ) (191,407 ) Net book value of depreciable assets 109,355 107,950 Construction in progress 2,785 245 Land 35,863 38,083 $ 148,003 $ 146,278 At December 31, 2018, the Company has $9.2 million of assets, net of accumulated depreciation, under capital leases which are reflected in the above table. For the years ended December 31, 2018 , 2017 and 2016 , depreciation expense was $28.4 million , $24.8 million and $26.9 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 12 ). Substantially all of the Company’s long-lived assets are located in the United States. The Company reviews property and equipment for impairment whenever events or changes in circumstances indicate that 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. 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. Approximately $6.4 million were classified as held for sale on the Company's Consolidated Balance Sheet at December 31, 2016. During the year ended December 31, 2017, approximately $5.4 million of these assets were sold for cash of $4.5 million . The difference of $0.9 million is classified as a loss on the sale of assets on the Consolidated Statements of Operations. The remaining assets held for sale of $1.0 million was classified as a total loss as a result of Hurricane Harvey. Insurance claims of approximately $0.9 million were received in the fourth quarter of 2017. The difference of $0.1 million is classified as a loss on disposal of assets on the Consolidated Statements of Operations. No assets remained as held for sale on the Company's Consolidated Balance Sheet at December 31, 2017 or December 31, 2018.

Inventory

Inventory	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventory	Inventory Current inventory at December 31, 2018 and December 31, 2017 , of $1.1 million and $4.4 million , respectively, consisted primarily of spare parts and small equipment held for use in the ordinary course of business. Non-current inventory at December 31, 2018 and December 31, 2017 totaled $7.6 million and $4.9 million , respectively, and consisted primarily of spare engine components or items which require longer lead times for sourcing or fabrication for certain of the Company's assets to reduce equipment downtime.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value 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, 2018 and December 31, 2017 : Fair Value Measurements Carrying Value Level 1 Level 2 Level 3 December 31, 2018 Assets: Cash surrender value of life insurance policy $ 1,993 — 1,993 — Liabilities: Derivatives $ 79 — 79 — December 31, 2017 Assets: Cash surrender value of life insurance policy $ 1,712 — 1,712 — Liabilities: Derivatives $ 38 — 38 — 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 12 for additional information on the Company's derivative instrument. Our concrete segment has life insurance policies with a combined face value of $11.1 million as of December 31, 2018. 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 goodwill and indefinite-lived intangible assets. Other Fair Value Measurements The fair value of the Company's debt at December 31, 2018 and 2017 approximated its carrying value of $80.5 million and $88.8 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.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The table below summarizes changes in goodwill recorded by the Company during the periods ended December 31, 2018 and 2017 : December 31, December 31, Beginning balance, January 1 $ 69,483 $ 66,351 Additions — 3,132 Impairments (69,483 ) — Ending balance $ — $ 69,483 Additions to goodwill in 2017 were attributable to the acquisition of TBC. The additions above represent goodwill calculated for the acquisition at the date of closing, plus the working capital adjustment which was all attributable to goodwill. As discussed previously in Note 2 , goodwill is reviewed at a reporting unit level for impairment annually as of October 31 or whenever circumstances arise that indicate a possible impairment might exist. In the fourth quarter of 2018, the Company's annual goodwill impairment test indicated that its goodwill was fully impaired, primarily as a result of decline in market capitalization and as a result it incurred a goodwill impairment charge of $69.5 million with $33.8 million related to the Marine segment and $35.7 million related to the Concrete segment. Intangible assets The tables below present the activity and amortizations of finite-lived intangible assets: December 31, December 31, Intangible assets, January 1 $ 35,240 $ 34,362 Additions — 878 Total intangible assets, end of year 35,240 35,240 Accumulated amortization, January 1 $ (23,956 ) $ (19,220 ) Current year amortization (3,389 ) (4,736 ) Total accumulated amortization (27,345 ) (23,956 ) Net intangible assets, end of year $ 7,895 $ 11,284 Finite-lived intangible assets were acquired as part of the purchase of TBC, which included contractual backlog and customer relationships. Contractual backlog was valued at approximately $0.1 million and was amortized over seven months in 2017. Customer relationships were valued at approximately $0.7 million and will be amortized over seven years. Both of these assets will be amortized using an accelerated method based on the pattern in which the economic benefits of the assets are consumed. For the year ended December 31, 2018 , $3.4 million of amortization expense was recognized for these assets. In 2018 and 2017, the Company evaluated the useful lives of these finite-lived intangible assets and no change was needed. Future expense remaining of approximately $7.9 million will be amortized as follows: 2019 $ 2,640 2020 2,069 2021 1,521 2022 1,239 2023 389 Thereafter 37 $ 7,895 Additionally, the Company has one indefinite-lived intangible asset, a trade name, which is tested 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. The impairment test concluded that the fair value of the trade name was $14.0 million , and the carrying value was $6.9 million , therefore no impairment was recorded.

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities at December 31, 2018 and 2017 consisted of the following: 2018 2017 Accrued salaries, wages and benefits $ 6,492 $ 9,632 Accrual for insurance liabilities 5,680 5,233 Property taxes 924 513 Capital lease liability 3,045 — Sales taxes 2,178 1,836 Interest — 46 Other accrued expenses 521 613 $ 18,840 $ 17,873

Long-term Debt and Line of Cred

Long-term Debt and Line of Credit	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-term Debt and Line of Credit	Long-term Debt and Line of Credit 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. With the execution of the Credit Agreement (known to Regions Bank and co-syndication agents as the Fourth Amendment), the prior indebtedness was treated as an extinguishment of debt and accounted for under the guidelines of ASC 470-05, Debt, Modifications and Extinguishments. The primary purpose of the Credit Agreement was to provide the Company with greater financing flexibility by providing a new amortization schedule, an extended maturity date, increased availability under the revolving line of credit, and a reduction in overall costs. The Credit Agreement, which may be amended from time to time, provides for borrowings under a revolving line of credit and swingline loans with a commitment amount of $100.0 million and a term loan with a commitment amount of $60.0 million (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. The Credit Facility matures on July 31, 2023. Total debt issuance costs for the Fourth Amendment, which included underwriter fees, legal fees and syndication fees were approximately $0.9 million and have been capitalized as non-current deferred charges and amortized using the effective interest rate method over the duration of the loan. Prior unamortized debt issuance costs of $2.2 million for the extinguishment of debt were recognized as interest expense as of July 31, 2018. During the fourth quarter of 2018, the Company executed the Fifth Amendment and additional costs were incurred of approximately $0.7 million . The weighted average interest rate for the Credit Facility as of December 31, 2018 was 4.63% . The Company's obligations under debt arrangements consisted of the following: December 31, 2018 December 31, 2017 Principal Debt Issuance Costs (1) Total Principal Debt Issuance Costs (1) Total Revolving line of credit $ — $ — $ — $ 10,000 $ (317 ) $ 9,683 Term loan - current 3,000 (54 ) 2,946 13,500 (427 ) 13,073 Total current debt 3,000 (54 ) 2,946 23,500 (744 ) 22,756 Revolving line of credit 22,000 (213 ) 21,787 — — — Term loan - long-term 55,500 (1,168 ) 54,332 65,250 (2,065 ) 63,185 Total long-term debt $ 77,500 $ (1,381 ) $ 76,119 $ 65,250 $ (2,065 ) $ 63,185 Total debt $ 80,500 $ (1,435 ) $ 79,065 $ 88,750 $ (2,809 ) $ 85,941 (1) Total debt issuance costs, include underwriter fees, legal fees, syndication fees, and fees related to the execution of the First, Second, Third, Fourth and Fifth Amendments to the Credit Agreement as previously discussed. Provisions of the revolving line of credit and accordion T he Company has a maximum borrowing availability under the revolving line of credit and swingline loans (as defined in the Credit Agreement) of $100.0 million . With the execution of the Fifth Amendment, the maximum borrowing availability under the revolving line of credit as of December 31, 2018, was temporarily reduced to $65.0 million and will remain in effect until certain conditions have been met. The letter of credit sublimit is equal to the lesser of $20.0 million and the aggregate unused amount of the revolving commitments then in effect. The swingline sublimit is 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 made in an aggregate minimum amount of $1.0 million and integral multiples of $250,000 in excess of that amount. Swingline loans must be made 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 available to borrow 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. The maturity date for amounts drawn under the revolving line of credit is the earlier of the Facility termination date of July 31, 2023, or the date the outstanding balance is permanently reduced to zero. Prior to the fourth quarter of 2018, the Company classified amounts drawn as current liabilities based on an intent and ability to repay the amounts using current assets within the next twelve months. During the fourth quarter of 2018, the Company determined it no longer has the intent to repay amounts drawn within the next twelve months. Therefore, the Company has classified the entire outstanding balance of the revolving line of credit as non-current. As of December 31, 2018 , the outstanding balance for all borrowings under the revolving line of credit was $22.0 million and was designated as an Adjusted LIBOR Rate Loan at a rate of 4.63% . There were also $0.8 million in outstanding letters of credit as of December 31, 2018 , which reduced the maximum borrowing availability on the revolving line of credit to $42.2 million as of December 31, 2018 . During 2018, the Company drew down $39.9 million , transferred $12.0 million from the term loan and made payments of $39.9 million on the revolving line of credit. Provisions of the term loan The original principal amount of $60.0 million for the term loan commitment is paid off in quarterly installment payments (as stated in the Credit Agreement). At December 31, 2018 , the outstanding term loan component of the Credit Facility totaled $58.5 million and was secured by specific assets of the Company. The table below outlines the total remaining payment amounts annually for the term loan through maturity of the Credit Facility: 2019 3,000 2020 3,750 2021 4,500 2022 5,250 2023 42,000 $ 58,500 The Company made the scheduled quarterly principal payments of $ 8.2 million and an additional amount of $12.0 million during 2018 was transferred to the revolving line of credit, which reduced the outstanding principal balance to $58.5 million at December 31, 2018 . The current portion of debt is $3.0 million and the non-current portion is $55.5 million . As of December 31, 2018 , the term loan was designated as an Adjusted LIBOR Rate Loan with an interest rate of 4.63 %. Financial covenants Restrictive financial covenants under the Credit Facility include: • A consolidated Fixed Charge Coverage Ratio as of the end of any fiscal quarter to not be less than 1.25 to 1.00. • A consolidated Leverage Ratio to not exceed the following during each noted period: -Fiscal Quarter Ending December 31, 2018, to not exceed 3.00 to 1.00; -Fiscal Quarter Ending March 31, 2019, to not exceed 4.75 to 1.00; -Fiscal Quarter Ending June 30, 2019, to not exceed 4.75 to 1.00; -Fiscal Quarter Ending September 30, 2019 and each Fiscal Quarter thereafter, to not exceed 3.00 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. During the fourth quarter of 2018, the Company initiated discussions with the lead bank due to concerns it would not be in compliance with financial covenants. The Company executed the Fifth Amendment during March 2019, which was effective as of December 31, 2018. The Leverage Ratio was adjusted beginning with the quarter ended December 31, 2018 through September 30, 2019 and each Fiscal Quarter thereafter, as reflected above. The Fixed Charge Coverage Ratio was unchanged. Additionally with this amendment, for the purpose of calculating the financial covenants, solely with respect to the Fiscal Quarters of the Borrower ending March 31, 2019, June 30, 2019 and September 30, 2019, Consolidated EBITDA to be determined for the Fiscal Quarter of the Borrower ending (A) March 31, 2019 by multiplying the Consolidated EBITDA for such Fiscal Quarter by four (4), (B) June 30, 2019 by multiplying the Consolidated EBITDA for such Fiscal Quarter plus the Consolidated EBITDA for the immediately preceding Fiscal Quarter by two (2) and (C) September 30, 2019 by multiplying the Consolidated EBITDA for such Fiscal Quarter plus the Consolidated EBITDA for the immediately preceding two (2) Fiscal Quarters by four-thirds (4/3). This amendment to the Credit Agreement will increase the cost of the Company's borrowings and will impose additional limitations on certain types of activities, such as acquisitions. With the execution of the aforementioned amendment, the Company was in compliance with all financial covenants as of December 31, 2018. Derivative Financial Instruments On September 16, 2015 , the Company entered into a series of receive-variable, pay-fixed interest rate swaps to hedge the variability in the interest payments on 50% of the aggregate principal amount of the Regions Term Loan outstanding, beginning with a notional amount of $67.5 million . There are a total of five sequential interest rate swaps to achieve the hedged position and each year on August 31, with the exception of the final swap, the existing interest rate swap is scheduled to expire and will be immediately replaced with a new interest rate swap until the expiration of the final swap on July 31, 2020. On December 6, 2018, the Company entered a sixth receive-variable, pay-fixed interest rate swaps to hedge the variability of interest payments. The sixth swap will begin with a notional amount of $27.0 million on July 31, 2020 will hedge the variability in the interest payments on 50% of the aggregate scheduled principal amount of the Regions Term Loan outstanding. The sixth swap is scheduled to expire on July 31, 2023. At inception, these interest rate swaps were designated as a cash flow hedge for hedge accounting, and as such, the effective portion of unrealized changes in market value are recorded in accumulated other comprehensive income (loss) and reclassified into earnings during the period in which the hedged forecasted transaction affects earnings. Gains and losses from hedge ineffectiveness are recognized in current earnings. The change in fair market value of the swaps as of December 31, 2018 is less than $0.1 million , which is reflected in the balance sheet as a liability. The fair market value of the swaps as of December 31, 2018 is less than $0.1 million . See Note 9 for more information regarding the fair value of the Company's derivative instruments.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, the Act was enacted and signed into law. The Act makes broad and complex changes to the U.S. tax code. The Act, among other things, reduces the U.S. federal corporate income tax rate from 35% to 21%; limits the use of foreign tax credits to reduce U.S. income tax liability; eliminates the corporate AMT and changes how existing AMT credits can be realized; allows immediate expensing for qualified assets; creates a new limitation on deductible interest expense; repeals the domestic production activities deduction; and limits the deductibility of certain executive compensation and other deductions. ASC 740 requires a company to record the effects of a tax law change in the period of enactment. SAB 118 has provided guidance for companies that have not completed their accounting for the income tax effect of the Act in the period of enactment, allowing for a measurement period of up to one year after the enactment date in order to finalize the recording of the related tax impacts. As of December 31, 2017, the Company made a provisional estimate of the impact of the Act and recorded a net tax benefit of $5.9 million. During the year ended December 31, 2018, we finalized our accounting for the income effects of the Tax Act and determined we had no material change to our provisional amount. The following table presents the components of our consolidated income tax (benefit) expense for the years ended December 31, 2018 , 2017 and 2016 : Current Deferred Total Year ended December 31, 2018 U.S. Federal $ (12 ) $ (12,664 ) $ (12,676 ) State and local 183 $ (471 ) $ (288 ) Foreign 731 — 731 $ 902 $ (13,135 ) $ (12,233 ) Year ended December 31, 2017 U.S. Federal (a) $ (780 ) $ (3,986 ) $ (4,766 ) State and local 550 (180 ) 370 Foreign (145 ) — (145 ) $ (375 ) $ (4,166 ) $ (4,541 ) Year ended December 31, 2016 U.S. Federal $ 35 $ (1,093 ) $ (1,058 ) State and local 511 1,519 2,030 Foreign 284 325 609 $ 830 $ 751 $ 1,581 (a) Includes a $5.9 million net benefit recorded in the fourth quarter of 2017 resulting from the enactment of the Act on December 22, 2017. 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: 2018 2017 2016 Statutory amount (computed at 21% in 2018 and 35% in 2017 and 2016) $ (22,398 ) $ (1,449 ) $ (714 ) Re-measurement of deferred tax assets (a) — (7,451 ) — Valuation allowance on foreign tax credits (a) 593 1,514 — State income tax, net of federal benefit (1,922 ) 168 94 Permanent differences, other 1,550 505 99 Permanent differences, incentive stock options (24 ) 447 224 Valuation allowance, other 10,384 (77 ) 1,769 Uncertain tax provision — 1,614 — Other (416 ) 188 109 Consolidated income tax provision $ (12,233 ) $ (4,541 ) $ 1,581 Consolidated effective tax rate 11.5 % 109.7 % (77.5 )% (a) ) In 2017, represents impact resulting from the enactment of the Act on December 22, 2017. In the current year, the Company's effective tax rate differed from the statutory rate of 21% primarily due to recording an $11.0 million , or $0.39 per share, valuation allowance against the Company’s net deferred tax assets, including net operating losses and foreign tax credits. The Company also recorded tax expense of $1.2 million related to the $69.5 million goodwill impairment. Additionally, the Company recorded tax expense related to permanent differences from meals and entertainment. In the prior year, the Company's effective tax rate differed from the statutory rate of 35% primarily due to the impact of the Act enacted on December 22, 2017. We recorded a net tax benefit of $5.9 million , or $0.21 per share, resulting from the re-measurement of the Company’s net deferred tax liabilities to reflect the new, lower U.S. corporate income tax rate of 21%, partially offset by the addition of a partial valuation allowance recorded against existing foreign tax credit carryforwards not expected to be utilized in future tax years. This net tax benefit was partially offset by the addition of an uncertain tax position reserve as well as tax expense for permanent differences associated with incentive stock options and meals and entertainment. Deferred Taxes The Company’s deferred tax assets and liabilities are as follows: Long Term As of December 31, 2018 2017 Assets related to: Accrued liabilities $ 1,105 $ 1,226 Intangible assets 3,054 3,010 Net operating loss carryforward 15,970 6,912 Valuation allowance (14,326 ) (3,942 ) Non-qualified stock options 672 762 Foreign tax credits 1,489 1,751 Valuation allowance on foreign tax credits (1,489 ) (1,514 ) Goodwill 8,200 — Other 2,684 215 Total assets 17,359 8,420 Liabilities related to: Depreciation and amortization (16,974 ) (15,788 ) Goodwill — (5,178 ) Deferred revenue on maintenance contracts (434 ) (597 ) Other — (100 ) Total liabilities (17,408 ) (21,663 ) Net deferred (liabilities) assets $ (49 ) $ (13,243 ) (a) Components of our deferred tax assets and liabilities at December 31, 2017 after taking into account the estimated impact of the Act and related items. As reported in the Consolidated Balance Sheets: December 31, 2018 December 31, 2017 Net current deferred tax assets — — Net non-current deferred tax liabilities (49 ) (13,243 ) Total net deferred tax liabilities: $ (49 ) $ (13,243 ) In the quarter ended March 31, 2017, the Company adopted ASU 2016-09, Improvements to Employee-Based Payment Accounting . As part of this adoption, certain federal net operating losses ("NOLs") that were previously classified as off-balance sheet are now being recognized as deferred tax assets through an adjustment to opening retained earnings. The Company chose to prospectively adopt this guidance during the first quarter of 2017 and as such the balance sheet includes an adjustment of approximately $0.7 million as an addition to "Retained earnings" and a reduction to the "Deferred income taxes" line items on the Consolidated Balance Sheet in order to true-up the tax effected portion of the NOLs mentioned above. Due to the prospective adoption, no prior year adjustments were made. The Company assessed the realizability of its deferred tax assets at December 31, 2018 and 2017, and considered whether it was more likely than not that some portion or all the deferred tax assets will not be realized. The Company assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to use 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. In the quarter ended December 31, 2018, the Company recorded an impairment of goodwill in the amount of $69.5 million and a pre-tax loss of $106.7 million when the company had previously projected to have taxable income. According to ASC subtopic 740-10, the Company’s three-year cumulative loss 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, in 2018, the Company has recorded an additional valuation allowance of $11.0 million on the net deferred tax assets. Uncertain Tax Benefits The Company and its subsidiaries file consolidated federal income tax returns in the United States and also file in various states. With few exceptions, the Company remains subject to federal and state income tax examinations for the years of 2013, 2014, 2015, 2016, 2017 and 2018. As of December 31, 2018 and 2017, the Company had 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, 2018 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. Our uncertain tax benefits, if recognized, would affect the Company's effective tax rate. The change in the total gross unrecognized tax benefits and prior year audit resolutions of the Company during the years ended December 31, 2018 and 2017 are reconciled in the table below: 2018 2017 Balances at beginning of the year $ 1,614 $ — Additions based on tax position related to current year — — Additions based on tax positions related to prior years — 1,614 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 the end of 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, 2018, 2017and 2016. 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, 2019 .

Earnings (Loss) Per Share

Earnings (Loss) Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	(Loss) Per Share Basic earnings (loss) per share are based on the weighted average number of common shares outstanding during each period. Diluted earnings per share are based on the weighted average number of common shares outstanding and the effect of all dilutive common stock equivalents during each period. The exercise price for certain stock options awarded by the Company exceeds the average market price of the Company's common stock. Such stock options are anti-dilutive and are not included in the computation of earnings (loss) per share. For the years ended December 31, 2018 , 2017 and 2016 , the Company had 1,938,967 , 2,274,908 , and 2,381,926 , securities, respectively, that were potentially dilutive in future earnings per share calculations. Such dilution will be dependent on the excess of the market price of our stock over the exercise price and other components of the treasury stock method. The following table reconciles the denominators used in the computations of both basic and diluted earnings (loss) per share: Year ended December 31, 2018 2017 2016 Basic: Weighted average shares outstanding 28,518,353 28,029,936 27,536,967 Diluted: Total basic weighted average shares outstanding 28,518,353 28,029,936 27,536,967 Effect of dilutive securities: Common stock options — 324,344 — Total weighted average shares outstanding assuming dilution 28,518,353 28,354,280 27,536,967 Anti-dilutive stock options — — — Shares of common stock issued from the exercise of stock options 488,303 229,551 13,850

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Compensation Committee of the Company’s Board of Directors is responsible for the administration of the Company’s stock incentive plans, which include the balance of shares remaining under the 2011 Long Term Incentive Plan (the "2011 LTIP") and 2017 Long Term Incentive Plan (the "2017 LTIP"), which was approved by shareholders in May 2017 and authorized the maximum aggregate number of shares to be issued of 2,400,000 . In general, the Company's 2017 LTIP provides for grants of restricted stock and stock options to be issued with a per-share price equal to the fair market value of a share of common stock on the date of grant. Option terms are specified at each grant date, but are generally are 10 years from the date of issuance. Options generally vest over a three to five year period. Restricted Stock The following table summarizes the restricted stock activity under the Company's equity incentive plans : Number of Shares Weighted Average Fair Value Per Share Nonvested at January 1, 2016 120,154 $ 9.28 Granted 407,002 $ 4.96 Vested (147,259 ) $ 6.62 Forfeited/repurchased shares (7,591 ) $ 7.08 Nonvested at December 31, 2016 372,306 $ 5.66 Granted 345,913 $ 7.22 Vested (225,406 ) $ 7.25 Forfeited/repurchased shares (120,353 ) $ 6.08 Nonvested at December 31, 2017 372,460 $ 6.01 Granted 333,864 $ 7.47 Vested (217,244 ) $ 6.61 Forfeited/repurchased shares (71,139 ) $ 6.85 Nonvested at December 31, 2018 417,941 $ 7.04 Independent directors receive equity compensation in the form of grants. In May 2018, the Company's independent directors each received equity compensation grants of 12,064 shares, with a fair value of $7.46 per share. In May 2017, the Company's independent directors each received equity compensation grants of 12,465 shares, with a fair value of $7.22 per share and in May 2016, the Company's independent directors each received equity compensation grants of 14,170 shares, with a fair value of $4.94 per share. In May 2018, certain officers and executives of the Company were awarded 203,752 shares with a vesting period of three years and a fair value of $7.46 per share. In July 2018 an executive was awarded 2,769 shares of restricted common stock with a fair value of $9.03 per share. Additionally, in 2017, certain officers and executives of the Company were awarded 213,643 shares with a vesting period of three years and a weighted average fair value of $7.22 per share and in 2016, certain officers and executives of the Company were awarded 267,175 shares with a vesting period of three years and a weighted average fair value of $4.96 per share. Performance Stock In May 2018, the Company awarded certain executives 67,023 shares of performance based stock, which will potentially vest at the end of fiscal 2021, with 100% of the shares 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 shares awarded on the date of the grant was $7.46 per share. In May 2017, the Company awarded certain executives 69,945 shares of performance based stock, which vest based on the achievement of an objective return on invested capital measured over a two -year performance period covering the 2018 and 2019 fiscal years. The fair value on the date of grant was $7.22 per share. In May 2016, the Company awarded certain executives 68,977 shares of performance based stock, which vest based on the achievement of an objective return on invested capital measured over a two -year performance period covering the 2017 and 2018 fiscal years. The fair value on the date of the grant was $4.94 per share. Stock Options The following table summarizes the stock option activity under the Company's equity incentive plans: Number of Shares Weighted Average Exercise Price Per Share Weighted Average Contractual Life (Years) Aggregate Intrinsic Value Outstanding at January 1, 2016 2,149,900 $ 9.56 Granted 587,862 $ 4.98 Exercised (13,850 ) $ 4.86 Forfeited (374,466 ) $ 9.89 Outstanding at December 31, 2016 2,349,446 $ 8.39 Granted 425,204 $ 7.22 Exercised (229,551 ) $ 5.75 Forfeited (633,978 ) $ 10.36 Outstanding at December 31, 2017 1,911,121 $ 7.79 Granted 374,215 $ 7.49 Exercised (488,303 ) $ 5.76 Forfeited (132,252 ) $ 7.89 Outstanding at December 31, 2018 1,664,781 $ 8.31 Vested and expected to vest at December 31, 2017 1,779,990 $ 8.15 5.83 $ 15 Exercisable at December 31, 2018 1,247,450 $ 8.56 4.51 $ 14 The Company calculates the fair value of each option on the date of grant using the Black-Scholes pricing model and the following weighted-average assumptions in each year: 2018 2017 2016 Weighted average grant-date fair value of options granted $ 2.78 $ 7.22 $ 4.97 Risk-free interest rate 2.65 % 1.46 % 1.06 % Expected volatility 51.8 % 48 % 49 % Expected term of options (in years) 3.0 3.0 3.0 Dividend yield — % — % — % The risk-free interest rate is based on interest rates on U.S. Treasury zero-coupon issues that match the contractual terms of the stock option grants. The expected term represents the period in which the Company’s equity awards are expected to be outstanding, which for the years presented is based on the exercise history. For years ended December 31, 2018 , 2017 and 2016 , compensation expense related to stock based awards outstanding for the periods was $2.2 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. During the year ended December 31, 2018, certain officers and executives of the Company were awarded 374,215 options with a vesting period of three years and a weighted average exercise price of $7.49 per share. During the year ended December 31, 2017 , certain officers and executives of the Company were awarded 425,204 options with a vesting period of three years and a weighted average exercise price of $7.22 per share, and for the year ended December 31, 2016, certain officers and executives were awarded 587,862 options with a vesting period of three years and a weighted average exercise price of $4.98 per share. In the year ended December 31, 2018 , the Company received proceeds of approximately $2.8 million upon the exercise of 488,303 options. In the year ended December 31, 2017 , proceeds of $1.3 million upon the exercise of 229,551 options and in the year ended December 31, 2016 , 13,850 options were exercised, generating proceeds of less than $0.1 million . As of December 31, 2018 , total unrecognized compensation expense related to unvested stock and options was approximately $3.6 million, which is expected to be recognized over a period of approximately 2.0 years. 2018 2017 2016 Total intrinsic value of options exercised $ 1,286 $ 706 $ 53 Total fair value of shares vested $ 705 $ 855 $ 986

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefits	Employee Benefits 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, 2018 , 2017 and 2016 the Company contributed $1.4 million to the Plan, respectively. 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, 2018 , 2017 and 2015, the Company contributed $0.2 million , $0.4 million and $0.2 million , respectively. The Company's marine segment 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. Currently, the Company's concrete segment does not have union represented employees and, thus, does not participate under the above-mentioned defined pension plans, or any other plans, that cover union-represented employees. The following table presents the Company's participation in these plans: Pension Protection Act ("PPA") Certified Zone Status (1) FIP/RP Status Contributions Expiration of Collective Bargaining Agreement Employer Identification Number Surcharge Imposed Pension Trust Fund 2018 2017 P/I (2) 2018 2017 2016 International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds 91-6028571 Green Green N/A $ 2,482 $ 1,974 $ 2,158 — 2021 Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights 91-6029051 91-6029049 Green Green N/A $ 932 $ 693 $ 938 — 2021 Alaska Carpenters Trust Fund 92-0120866 Green Green N/A $ 328 $ 396 $ 889 — 2020 Alaska Laborers Trust Fund 91-6028298 Yellow Yellow I $ 321 $ 218 $ 126 — 2019 (1) The most recent PPA zone status available in 2018 and 2017 is for the plan's year end during 2017 and 2016, 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, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Capital and Operating Leases In 2005, the Company entered into a lease agreement for vehicles under a continuing operating lease agreement. Rental expense under this lease for the years ended December 31, 2018 , 2017 and 2016 was $1.0 million , $0.7 million , and $1.5 million , respectively. In 2016, the Company started transitioning its vehicle leases to a new lease agreement in an effort to update and expand its current fleet. The Company expects to fully transition all of its fleet vehicles to this new lease over the course of the next several years. Rental expense under this lease for the year ended December 31, 2018 , 2017 and 2016 was $2.0 million , $1.7 million and $1.0 million , respectively. The Company leases its corporate office in Houston, Texas under a lease with an initial term of nine years. In addition, the Company leases other facilities, including office space and yard facilities, under terms that range from one to five years. The Company also leases short-term field office space at its various construction sites for the duration of the projects. Future minimum lease payments under non-cancelable leases as of December 31, 2018 are as follows: Amount Year ended December 31, 2019 $ 10,308 2020 8,046 2021 4,648 2022 2,770 2023 2,143 Thereafter 5,290 $ 33,205 The Company’s total obligations under capital leases was $8.4 million as of December 31, 2018, which is reflected in accrued liabilities and long-term liabilities in the consolidated balance sheet. Litigation From time to time the Company is a party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, breach of contract, property damage, punitive damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to such lawsuits, the Company accrues reserves when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these or any other proceedings, individually or in the aggregate, would be expected to have a material adverse effect on results of operations, cash flows or financial condition. A pending legal matter was settled for $5.5 million during the first quarter of 2018. The settlement amount was recorded in "Other gain from continuing operations" in the Consolidated Statement of Operations, "Prepaid expenses and other" (current portion of the notes receivable) and "Other non-current assets" (non-current portion of the notes receivable) in the Consolidated Balance Sheets. As of December 31, 2018, the current portion of the note receivable was $0.8 million and the non-current portion was $3.0 million . Legal fees related to this matter were expensed as incurred during the respective reporting period. As a result of charges brought in September 2015 and October 2016 by the Houston Police Department, Environmental Enforcement, two subsidiaries of the Company were recently indicted at the request of the Harris County, Texas District Attorney’s Office by a duly organized Grand Jury of Harris County, Texas for separate but related violations of the Texas Water Code, allegedly arising from the handling of construction concrete at certain work sites. Specifically, both were charged with unlawfully, intentionally or knowingly discharging a waste or pollutant. The Company is subject to a maximum fine in each case of $250,000 , but has already declined a $75,000 plea bargain in the first case. In the second case, a project supervisor was also indicted. None of these allegations nor the costs of defense, taken separately or as a whole, is expected to have a material impact on the Company’s balance sheet or its liquidity. The Company considers all of these allegations without merit and it will vigorously defend itself and its employee.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	Segment Information 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, 2018 Year Ended December 31, 2017 Marine Contract revenues $ 243,883 $ 285,736 Operating loss (61,012 ) (18,406 ) Depreciation and amortization expense (22,657 ) (20,370 ) Total assets $ 190,503 $ 260,935 Property, plant and equipment, net 128,168 128,421 Concrete Contract revenues $ 277,011 $ 292,817 Operating (loss) income (39,528 ) 19,944 Depreciation and amortization expense (9,142 ) (9,121 ) Total assets $ 122,367 $ 172,350 Property, plant and equipment, net 19,835 17,857 There were $2.5 million in intersegment revenues between the Company's two reportable segments for the year ended December 31, 2018. There were no intersegment revenues between the Company's two reportable segments for the year ended December 31, 2017. The marine segment had foreign revenues of $12.2 million and $9.4 million , respectively, for the years ended December 31, 2018 and 2017 . These revenues are derived from projects in the Caribbean Basin and Mexico and are paid in U.S. dollars. There was no foreign revenue for the concrete segment.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Upon the completion of the TAS acquisition, the Company entered into a lease arrangement with an entity in which an employee owns an interest. This lease is for office space and yard facilities used by the concrete segment. Annual lease expense was approximately $478,000 and $820,000 for the years ending December 31, 2017 and 2016, respectively. Due to the resignation of this employee, these transactions ceased to be related party transactions as of July 31, 2017 and resulted in a lower annual lease expense for 2017 compared to 2016.

Selected Quarterly Financial Da

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data	Selected Quarterly Financial Data (Unaudited) The following tables set forth selected unaudited financial information for the eight quarters in the two-year period ended December 31, 2018 . This information has been prepared on the same basis as the audited financial statements and, in the opinion of management, contains all adjustments necessary for a fair presentation. First Quarter Second Quarter Third Quarter Fourth Quarter Total Year (in thousands, except per share data) 2018 Revenues $ 136,843 $ 159,767 $ 125,073 $ 99,211 $ 520,894 Gross profit 15,822 20,769 5,938 (20,880 ) 21,649 Operating (loss) income 7,069 4,591 (7,405 ) (104,795 ) (100,540 ) (Loss) income before income taxes 5,590 3,909 (9,427 ) (106,727 ) (106,655 ) Net (loss) income 4,101 2,249 (6,356 ) (94,416 ) (94,422 ) (Loss) earnings per share: Basic $ 0.15 $ 0.08 $ (0.22 ) $ (3.32 ) $ (3.31 ) Diluted $ 0.14 $ 0.08 $ (0.22 ) $ (3.32 ) $ (3.31 ) First Quarter Second Quarter Third Quarter Fourth Quarter Total Year (in thousands, except per share data) 2017 Revenues $ 138,757 $ 137,420 $ 140,162 $ 162,214 $ 578,553 Gross profit 12,985 15,397 10,757 27,751 66,890 Operating (loss) income (1,482 ) (2,466 ) (5,354 ) 10,840 1,538 (Loss) income before income taxes (2,827 ) (3,917 ) (6,703 ) 9,306 (4,141 ) Net (loss) income (1,808 ) (2,293 ) (5,037 ) 9,538 400 (Loss) earnings per share: Basic $ (0.07 ) $ (0.08 ) $ (0.18 ) $ 0.34 $ 0.01 Diluted $ (0.07 ) $ (0.08 ) $ (0.18 ) $ 0.34 $ 0.01

Schedule II - Valuation And Qua

Schedule II - Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation And Qualifying Accounts	SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Dollars in thousands) Description Balance at the Beginning of the Period Charged to Revenue, Cost or Expense Deduction Balance at the End of the Period Year ended December 31, 2016 Provision for doubtful accounts $ — $ — $ — $ — Reserve for losses on uncompleted contracts $ — $ — $ — $ — Year ended December 31, 2017 Provision for doubtful accounts $ — $ — $ — $ — Reserve for losses on uncompleted contracts $ — $ — $ — $ — Year ended December 31, 2018 Provision for doubtful accounts $ — $ 4,280 $ — $ 4,280 Reserve for losses on uncompleted contracts $ — $ 22,770 $ — $ 22,770

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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. All intercompany balances and transactions have been eliminated in consolidation.
Revenue Recognition	Revenue Recognition The Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), on January 1, 2018, using the modified retrospective method. The Company recognized the cumulative effect of initially adopting Topic 606 guidance as an adjustment to the beginning balance of retained earnings. Contracts with customers that were not substantially complete in both the Company’s marine and concrete segments were evaluated in order to determine the impact as of the date of adoption. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. 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 short in duration and usually span a period of less than one year. The Company determines the appropriate accounting treatment for each contract before work begins and generally records revenue on contracts 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. The Company's contracts and related change orders typically represent a single performance obligation because individual goods and services are not separately identifiable and the Company provides a significant integrated service. Revenue is recognized over time because control is continuously transferred to the customer. 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 incurring 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 losses on uncompleted contracts are anticipated, the entire loss is recognized 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 the most likely amount to which it expects to be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative recognized revenue will not occur. As of December 31, 2018 , approximately $1.1 million of claims against customers has been recognized and is reflected on the Company's Consolidated Balance Sheet under "Costs and estimated earnings in excess of billings on uncompleted contracts." The Company believes collection of these claims is probable, although the full amount of the recorded claims may not be collected. Contract assets and liabilities include the following: • Accounts Receivable: Trade, net of allowance - Represent amounts billed and currently due from customers and are stated at their net estimated realizable value. • Accounts Receivable: Retainage - Represent amounts which have not been billed to customers or paid pursuant to retainage provisions in construction contracts, which generally become payable upon contract completion and acceptance by the customer. • Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts - 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 (i.e. Contract Assets) and are recorded as a current asset. • Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts - Represent billings in excess of revenues recognized (i.e. Contract Liabilities) and are recorded as a current liability. The Company’s evaluation of its construction contracts under the new standard focused on the following areas which have the most significant impact on the amount and timing of revenue recognized: • Performance Obligations - Construction contracts with customers, including those related to contract modifications, were reviewed to determine if there were any multiple performance obligations. Based on our review, a limited number of contracts in the marine segment and no contracts in the concrete segment were identified as having multiple performance obligations. The net impact on retained earnings as of January 1, 2018 and gross profit for the year ended December 31, 2018 were not material. • Upfront Costs - These costs were required to be capitalized as assets and were recorded as part of "Costs and estimated earnings in excess of billings on uncompleted contracts" in the Company’s Consolidated Balance Sheets and amortized over the expected duration of the contract as part of "Costs of contract revenues" in the Company’s Consolidated Statements of Operations. If the expected completion date of the contract changes, the amortization period will be recalculated and adjusted prospectively. The amortization of such costs for the Company are generally comprised of initial costs incurred to mobilize equipment and labor to a job site or other upfront costs such as bonds or insurance prior to the "notice-to-proceed" date, which had been expensed as incurred in prior periods. Based on the Company's review, certain contracts in the marine segment were identified as having material upfront costs. The Company also reviewed contracts for the concrete segment and while certain contracts within the segment were identified as having upfront costs, they were not considered material.
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, 2018 and 2017 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, less allowances for doubtful accounts. The Company has significant investments in billed and unbilled receivables as of December 31, 2018 and 2017 . 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, which are included in costs in excess of billings, arise as revenues are recognized over time. Unbilled amounts on contracts represent recoverable costs and accrued profits not yet billed. Revenue associated with these billings is recorded net of any sales tax, if applicable. Past due balances over 90 days and other higher risk amounts are reviewed individually for collectability. In establishing an allowance for doubtful accounts, the Company evaluates its contract receivables and costs in excess of billings and thoroughly reviews historical collection experience, the financial condition of its customers, billing disputes and other factors. The Company writes off uncollectible accounts receivable against the allowance for doubtful accounts if it is determined that the amounts will not be collected or if a settlement is reached for an amount that is less than the carrying value. As of December 31, 2018 and 2017 , the Company had recorded an allowance for doubtful accounts of $4.3 million and none, 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, 2018 totaled $30.7 million , of which $3.2 million is expected to be collected beyond 2019. Retainage at December 31, 2017 totaled $39.2 million . 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 recorded, which could result in the recording of a loss. 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 expenditure is considered probable and the amount can be reasonably estimated.
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 9 for more information regarding fair value determination. 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.
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 to seven years until the next scheduled maintenance. 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 5 years Buildings and improvements 5 to 30 years Construction equipment 3 to 15 years Vessels and other equipment 1 to 15 years Office equipment 1 to 5 years The Company generally uses accelerated depreciation methods for tax purposes where appropriate. Dry-docking costs are capitalized and amortized using the straight-line method over a period ranging from three to 15 years. Dry-docking costs include, but are not limited to, the inspection, refurbishment and replacement of steel, engine components, tailshafts, mooring equipment and other parts of the vessel. Amortization related to dry-docking activities is included as a component of depreciation. These costs and the related amortization periods are periodically reviewed to 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 were no assets classified as held for sale as of December 31, 2018 or December 31, 2017.
Goodwill	Goodwill The Company has acquired businesses and assets in purchase transactions that resulted in the recognition of goodwill. Goodwill represents the costs in excess of fair values assigned to the identifiable assets acquired and liabilities assumed in the acquisition. In accordance with U.S. GAAP, acquired goodwill is not amortized, but is subject to impairment testing at least annually at a reporting unit level (as of October 31 of each year) or more frequently if events or circumstances indicate the asset may be impaired. The Company determined its operations comprise two reporting units for goodwill impairment testing, which match its two operating segments for financial reporting. The Company assesses the fair value of its reporting units based on a weighted average of valuations based on market multiples and discounted cash flows, as well as consideration of its market capitalization. The key assumptions used in the discounted cash flow valuations are discount rates, weighted average cost of capital and perpetual growth rates applied to cash flow projections. Also inherent in the discounted cash flow valuation models are past performance, projections and assumptions in current operating plans and revenue growth rates over the next five years. These assumptions contemplate business, market and overall economic conditions. Other considerations are assumptions that market participants may use in analysis of comparable companies. The underlying assumptions used for determining fair value, as discussed above, require significant judgment and are susceptible to change from period to period and could potentially cause a material impact to the income statement. In the future, the Company's estimated fair value could be negatively impacted by extended declines in its stock price, changes in macroeconomic indicators, sustained operating losses and other factors which may affect its assessment of fair value. As required, annual impairment testing of goodwill is performed as of October 31 of each year or whenever circumstances arise that indicate a possible impairment might exist. Based on this testing, we concluded that as of December 31, 2018, our Marine segment’s goodwill of $33.8 million and our Concrete segment’s goodwill of $35.7 million were fully impaired. See Note 10 for additional discussion of our goodwill and related goodwill impairment testing.
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 indefinite lives are not amortized, but are subject to impairment testing at least annually or more frequently if events or circumstances indicate the asset may be impaired. The Company has one indefinite-lived intangible asset, a trade name, which is tested for impairment annually on October 31, or whenever events or circumstances indicate 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 asset 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.
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 options granted is estimated on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model requires the use of subjective assumptions in the computation. Changes in these assumptions can cause significant fluctuations in the fair value of the option award. The fair value of restricted stock grants 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 share-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.
Income Taxes	Income Taxes
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 Results 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements The FASB issues accounting standards and updates (each, an "ASU") from time to time to its ASC, which is the primary source of U.S. GAAP. The Company regularly monitors ASUs as they are issued and considers applicability to its business. All ASUs are adopted by their respective due dates and in the manner prescribed by the FASB. The following are those recently issued ASUs most likely to affect the presentation of the Company's consolidated financial statements: In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize lease assets (i.e. right-to-use assets) on the balance sheet. These are assets that represent the lessee's right to use or control the use of specified assets for the lease terms and lease liabilities, which are lessee's obligations to make lease payments arising from leases measured on a discounted basis, for all leases with terms longer than 12 months. Leases with terms of 12 months or less will be accounted for similar to existing guidance for operating leases. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company will adopt the new standard on January 1, 2019 using the optional transition method under ASU 2018-11 and elect the available practical expedients. This method allows the Company an option to allow transition of the new lease guidance at the effective date and recognize a cumulative-effect adjustment to the opening balance of retained earnings at the effective date. Under this method, the comparative periods presented in the financial statements prior to the adoption date would not be adjusted to apply ASC 842.The Company expects the adoption of ASC 842 to result in a material increase of approximately $20 million to $30 million to assets and liabilities on its consolidated balance sheets. The Company does not anticipate the adoption of ASC 842 to have a material effect on its consolidated statements of operations and statements of cash flows. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350). The FASB issued this update to simplify how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill. The amendments in this update modify the concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to the condition that exists when the carrying amount of a reporting unit exceeds its fair value. The guidance should be applied on a prospective basis and is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted and as such the Company has elected to adopt ASU 2017-04 as of December 31, 2018. The adoption of this ASU had no material impact on the Company's Consolidated Financial Statements. In January 2018, the FASB issued ASU 2018-01, Land Easement Practical Expedient for Transition to Topic 842. The FASB issued this update to provide an optional transition on practical expedient that, if elected, would not require companies to reconsider its accounting for existing or expired land easements before the adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company is currently in the process of assessing the effects of adoption on its financial statements, but it does not anticipate the new standard will materially impact the financial statements. During the periods presented in these financial statements, the Company implemented other new accounting pronouncements other than those noted above that are discussed in the notes where applicable.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table summarizes the cumulative effect of the changes made to the Company’s unaudited Consolidated Balance Sheet as of January 1, 2018 from the adoption of Topic 606: Balance at December 31, 2017 Adjustments Due to Topic 606 Balance at January 1, 2018 Assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 46,006 $ 1,383 $ 47,389 Liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 33,923 $ 1,745 $ 35,668 Deferred income taxes 13,243 (76 ) 13,167 Equity Retained earnings $ 62,847 $ (286 ) $ 62,561 The following tables summarize the impact of adopting Topic 606 on the Company’s Consolidated Balance Sheet as of December 31, 2018 and Statement of Operations for the year ended December 31, 2018: As Reported Balances Without Adoption of Topic 606 Effect of Change Higher (Lower) Assets Costs and estimated earnings in excess of billings on uncompleted contracts $ 9,217 $ 10,040 $ (823 ) Liabilities Billings in excess of costs and estimated earnings on uncompleted contracts $ 21,761 $ 22,886 $ (1,125 ) Deferred income taxes 49 (57 ) 106 Equity Retained earnings $ (31,861 ) $ (32,057 ) $ 196 As Reported Balances Without Adoption of Topic 606 Effect of Change Higher (Lower) Contract revenues $ 520,894 $ 519,769 $ 1,125 Cost of contract revenues 499,245 498,422 823 Gross profit 21,649 21,347 302 Income tax (benefit) expense (12,233 ) (12,339 ) 106 Net (loss) income $ (94,422 ) $ (94,618 ) $ 196 Basic (loss) income per share $ (3.31 ) $ (3.32 ) $ 0.01 Diluted (loss) income per share $ (3.31 ) $ (3.32 ) $ 0.01
Depreciable lives of property and equipment	Automobiles and trucks 3 to 5 years Buildings and improvements 5 to 30 years Construction equipment 3 to 15 years Vessels and other equipment 1 to 15 years Office equipment 1 to 5 years The following is a summary of property and equipment at December 31, 2018 and December 31, 2017 : December 31, December 31, Automobiles and trucks $ 1,709 $ 1,940 Building and improvements 43,628 38,062 Construction equipment 161,113 166,203 Vessels and other equipment 90,217 85,113 Office equipment 8,061 8,039 304,728 299,357 Less: accumulated depreciation (195,373 ) (191,407 ) Net book value of depreciable assets 109,355 107,950 Construction in progress 2,785 245 Land 35,863 38,083 $ 148,003 $ 146,278

Business Acquisition (Tables)

Business Acquisition (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of recognized identified assets acquired and liabilities assumed	Accounts receivable $ 3,239 Retainage 1,860 Fixed assets, net 2,098 Other 9 Goodwill 2,562 Other intangible assets 878 Accounts payable (2,017 ) Accrued expenses and other current liabilities (1,080 ) Contingent consideration (456 ) Deferred tax liability (1,093 ) Total Acquisition Consideration at April 9, 2017 $ 6,000 Working capital adjustment (all attributable to Goodwill) 557 Total Acquisition Consideration $ 6,557
Summary of Pro Forma Results	Pro Forma Results For the Year Ended December 31, 2016 Contract revenues $ 610,695 Operating income from continuing operations $ 5,593 Net loss $ (2,677 ) Basic loss per share $ (0.10 ) Diluted loss per share $ (0.10 )

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table represents a disaggregation of the Company’s contract revenues by service line for the marine and concrete segments: 2018 Marine Segment Construction $ 156,925 Dredging 73,237 Specialty Services 13,721 Marine segment contract revenues $ 243,883 Concrete Segment Light Commercial $ 215,628 Structural 60,926 Other 457 Concrete segment contract revenues $ 277,011 Total contract revenues $ 520,894

Concentration of Risk and Ent_2

Concentration of Risk and Enterprise Wide Disclosures (Tables)	12 Months Ended
	Dec. 31, 2018
Accounts receivable
Concentration Risk [Line Items]
Schedules of concentration of risk, by risk factor	The table below presents the concentrations of current receivables (trade and retainage) at December 31, 2018 and December 31, 2017 , respectively: December 31, 2018 December 31, 2017 Federal Government $ 2,319 2 % $ 3,509 3 % State Governments 916 1 % 4,503 3 % Local Governments 30,187 28 % 18,256 15 % Private Companies 74,953 69 % 97,874 79 % Total receivables $ 108,375 100 % $ 124,142 100 %
Contract revenues
Concentration Risk [Line Items]
Schedules of concentration of risk, by risk factor	dditionally, the table below represents concentrations of contract revenue by type of customer for the year s ended December 31, 2018 , 2017 and 2016 . 2018 % 2017 % 2016 % Federal Government $ 42,143 8 % $ 63,823 11 % $ 40,361 7 % State Governments 30,470 6 % 42,613 7 % 37,700 7 % Local Governments 107,478 21 % 91,591 16 % 94,461 16 % Private Companies 340,803 65 % 380,526 66 % 405,714 70 % Total contract revenues $ 520,894 100 % $ 578,553 100 % $ 578,236 100 %

Contracts in Progress (Tables)

Contracts in Progress (Tables)	12 Months Ended
	Dec. 31, 2018
Contractors [Abstract]
Contracts in progress	Contracts in progress are as follows at December 31, 2018 and December 31, 2017 : December 31, December 31, Costs incurred on uncompleted contracts $ 461,144 $ 668,848 Estimated earnings 73,170 120,751 534,314 789,599 Less: Billings to date (546,858 ) (777,516 ) $ (12,544 ) $ 12,083 Included in the accompanying consolidated balance sheets under the following captions: Costs and estimated earnings in excess of billings on uncompleted contracts 9,217 $ 46,006 Billings in excess of costs and estimated earnings on uncompleted contracts (21,761 ) (33,923 ) $ (12,544 ) $ 12,083

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Summary of property and equipment	Automobiles and trucks 3 to 5 years Buildings and improvements 5 to 30 years Construction equipment 3 to 15 years Vessels and other equipment 1 to 15 years Office equipment 1 to 5 years The following is a summary of property and equipment at December 31, 2018 and December 31, 2017 : December 31, December 31, Automobiles and trucks $ 1,709 $ 1,940 Building and improvements 43,628 38,062 Construction equipment 161,113 166,203 Vessels and other equipment 90,217 85,113 Office equipment 8,061 8,039 304,728 299,357 Less: accumulated depreciation (195,373 ) (191,407 ) Net book value of depreciable assets 109,355 107,950 Construction in progress 2,785 245 Land 35,863 38,083 $ 148,003 $ 146,278

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	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, 2018 and December 31, 2017 : Fair Value Measurements Carrying Value Level 1 Level 2 Level 3 December 31, 2018 Assets: Cash surrender value of life insurance policy $ 1,993 — 1,993 — Liabilities: Derivatives $ 79 — 79 — December 31, 2017 Assets: Cash surrender value of life insurance policy $ 1,712 — 1,712 — Liabilities: Derivatives $ 38 — 38 —

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in goodwill	The table below summarizes changes in goodwill recorded by the Company during the periods ended December 31, 2018 and 2017 : December 31, December 31, Beginning balance, January 1 $ 69,483 $ 66,351 Additions — 3,132 Impairments (69,483 ) — Ending balance $ — $ 69,483
Schedule of changes and amortization of finite-lived intangible assets	The tables below present the activity and amortizations of finite-lived intangible assets: December 31, December 31, Intangible assets, January 1 $ 35,240 $ 34,362 Additions — 878 Total intangible assets, end of year 35,240 35,240 Accumulated amortization, January 1 $ (23,956 ) $ (19,220 ) Current year amortization (3,389 ) (4,736 ) Total accumulated amortization (27,345 ) (23,956 ) Net intangible assets, end of year $ 7,895 $ 11,284
Summary of Finite-lived Intangible Assets Amortization Expense	Future expense remaining of approximately $7.9 million will be amortized as follows: 2019 $ 2,640 2020 2,069 2021 1,521 2022 1,239 2023 389 Thereafter 37 $ 7,895

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Schedule of accrued liabilities	Accrued liabilities at December 31, 2018 and 2017 consisted of the following: 2018 2017 Accrued salaries, wages and benefits $ 6,492 $ 9,632 Accrual for insurance liabilities 5,680 5,233 Property taxes 924 513 Capital lease liability 3,045 — Sales taxes 2,178 1,836 Interest — 46 Other accrued expenses 521 613 $ 18,840 $ 17,873

Long-term Debt and Line of Cr_2

Long-term Debt and Line of Credit (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Debt	The Company's obligations under debt arrangements consisted of the following: December 31, 2018 December 31, 2017 Principal Debt Issuance Costs (1) Total Principal Debt Issuance Costs (1) Total Revolving line of credit $ — $ — $ — $ 10,000 $ (317 ) $ 9,683 Term loan - current 3,000 (54 ) 2,946 13,500 (427 ) 13,073 Total current debt 3,000 (54 ) 2,946 23,500 (744 ) 22,756 Revolving line of credit 22,000 (213 ) 21,787 — — — Term loan - long-term 55,500 (1,168 ) 54,332 65,250 (2,065 ) 63,185 Total long-term debt $ 77,500 $ (1,381 ) $ 76,119 $ 65,250 $ (2,065 ) $ 63,185 Total debt $ 80,500 $ (1,435 ) $ 79,065 $ 88,750 $ (2,809 ) $ 85,941 (1) Total debt issuance costs, include underwriter fees, legal fees, syndication fees, and fees related to the execution of the First, Second, Third, Fourth and Fifth Amendments to the Credit Agreement as previously discussed.
Debt Maturity Schedule	The table below outlines the total remaining payment amounts annually for the term loan through maturity of the Credit Facility: 2019 3,000 2020 3,750 2021 4,500 2022 5,250 2023 42,000 $ 58,500

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of components of income tax expense (benefit)	The following table presents the components of our consolidated income tax (benefit) expense for the years ended December 31, 2018 , 2017 and 2016 : Current Deferred Total Year ended December 31, 2018 U.S. Federal $ (12 ) $ (12,664 ) $ (12,676 ) State and local 183 $ (471 ) $ (288 ) Foreign 731 — 731 $ 902 $ (13,135 ) $ (12,233 ) Year ended December 31, 2017 U.S. Federal (a) $ (780 ) $ (3,986 ) $ (4,766 ) State and local 550 (180 ) 370 Foreign (145 ) — (145 ) $ (375 ) $ (4,166 ) $ (4,541 ) Year ended December 31, 2016 U.S. Federal $ 35 $ (1,093 ) $ (1,058 ) State and local 511 1,519 2,030 Foreign 284 325 609 $ 830 $ 751 $ 1,581 (a) Includes a $5.9 million net benefit recorded in the fourth quarter of 2017 resulting from the enactment of the Act on December 22, 2017.
Schedule of effective income tax reconciliation	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: 2018 2017 2016 Statutory amount (computed at 21% in 2018 and 35% in 2017 and 2016) $ (22,398 ) $ (1,449 ) $ (714 ) Re-measurement of deferred tax assets (a) — (7,451 ) — Valuation allowance on foreign tax credits (a) 593 1,514 — State income tax, net of federal benefit (1,922 ) 168 94 Permanent differences, other 1,550 505 99 Permanent differences, incentive stock options (24 ) 447 224 Valuation allowance, other 10,384 (77 ) 1,769 Uncertain tax provision — 1,614 — Other (416 ) 188 109 Consolidated income tax provision $ (12,233 ) $ (4,541 ) $ 1,581 Consolidated effective tax rate 11.5 % 109.7 % (77.5 )%
Schedule of deferred tax assets and liabilities	The Company’s deferred tax assets and liabilities are as follows: Long Term As of December 31, 2018 2017 Assets related to: Accrued liabilities $ 1,105 $ 1,226 Intangible assets 3,054 3,010 Net operating loss carryforward 15,970 6,912 Valuation allowance (14,326 ) (3,942 ) Non-qualified stock options 672 762 Foreign tax credits 1,489 1,751 Valuation allowance on foreign tax credits (1,489 ) (1,514 ) Goodwill 8,200 — Other 2,684 215 Total assets 17,359 8,420 Liabilities related to: Depreciation and amortization (16,974 ) (15,788 ) Goodwill — (5,178 ) Deferred revenue on maintenance contracts (434 ) (597 ) Other — (100 ) Total liabilities (17,408 ) (21,663 ) Net deferred (liabilities) assets $ (49 ) $ (13,243 )
Schedule of net deferred tax assets and liabilities as reported in the balance sheet	As reported in the Consolidated Balance Sheets: December 31, 2018 December 31, 2017 Net current deferred tax assets — — Net non-current deferred tax liabilities (49 ) (13,243 ) Total net deferred tax liabilities: $ (49 ) $ (13,243 )
Schedule of unrecognized tax benefits	2018 2017 Balances at beginning of the year $ 1,614 $ — Additions based on tax position related to current year — — Additions based on tax positions related to prior years — 1,614 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 the end of year $ 1,614 $ 1,614

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of earnings per share, basic and diluted	The following table reconciles the denominators used in the computations of both basic and diluted earnings (loss) per share: Year ended December 31, 2018 2017 2016 Basic: Weighted average shares outstanding 28,518,353 28,029,936 27,536,967 Diluted: Total basic weighted average shares outstanding 28,518,353 28,029,936 27,536,967 Effect of dilutive securities: Common stock options — 324,344 — Total weighted average shares outstanding assuming dilution 28,518,353 28,354,280 27,536,967 Anti-dilutive stock options — — — Shares of common stock issued from the exercise of stock options 488,303 229,551 13,850

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of restricted stock activity	The following table summarizes the restricted stock activity under the Company's equity incentive plans : Number of Shares Weighted Average Fair Value Per Share Nonvested at January 1, 2016 120,154 $ 9.28 Granted 407,002 $ 4.96 Vested (147,259 ) $ 6.62 Forfeited/repurchased shares (7,591 ) $ 7.08 Nonvested at December 31, 2016 372,306 $ 5.66 Granted 345,913 $ 7.22 Vested (225,406 ) $ 7.25 Forfeited/repurchased shares (120,353 ) $ 6.08 Nonvested at December 31, 2017 372,460 $ 6.01 Granted 333,864 $ 7.47 Vested (217,244 ) $ 6.61 Forfeited/repurchased shares (71,139 ) $ 6.85 Nonvested at December 31, 2018 417,941 $ 7.04
Schedule of stock options activity	The following table summarizes the stock option activity under the Company's equity incentive plans: Number of Shares Weighted Average Exercise Price Per Share Weighted Average Contractual Life (Years) Aggregate Intrinsic Value Outstanding at January 1, 2016 2,149,900 $ 9.56 Granted 587,862 $ 4.98 Exercised (13,850 ) $ 4.86 Forfeited (374,466 ) $ 9.89 Outstanding at December 31, 2016 2,349,446 $ 8.39 Granted 425,204 $ 7.22 Exercised (229,551 ) $ 5.75 Forfeited (633,978 ) $ 10.36 Outstanding at December 31, 2017 1,911,121 $ 7.79 Granted 374,215 $ 7.49 Exercised (488,303 ) $ 5.76 Forfeited (132,252 ) $ 7.89 Outstanding at December 31, 2018 1,664,781 $ 8.31 Vested and expected to vest at December 31, 2017 1,779,990 $ 8.15 5.83 $ 15 Exercisable at December 31, 2018 1,247,450 $ 8.56 4.51 $ 14
Schedule of stock option valuation assumptions	The Company calculates the fair value of each option on the date of grant using the Black-Scholes pricing model and the following weighted-average assumptions in each year: 2018 2017 2016 Weighted average grant-date fair value of options granted $ 2.78 $ 7.22 $ 4.97 Risk-free interest rate 2.65 % 1.46 % 1.06 % Expected volatility 51.8 % 48 % 49 % Expected term of options (in years) 3.0 3.0 3.0 Dividend yield — % — % — %
Schedule of intrinsic value of options exercised and fair value of shares vested	2018 2017 2016 Total intrinsic value of options exercised $ 1,286 $ 706 $ 53 Total fair value of shares vested $ 705 $ 855 $ 986

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Schedule of multiemployer plans	The following table presents the Company's participation in these plans: Pension Protection Act ("PPA") Certified Zone Status (1) FIP/RP Status Contributions Expiration of Collective Bargaining Agreement Employer Identification Number Surcharge Imposed Pension Trust Fund 2018 2017 P/I (2) 2018 2017 2016 International Union of Operating Engineers - Employers Construction Industry Retirement Plan - Local 302 and 612 Trust Funds 91-6028571 Green Green N/A $ 2,482 $ 1,974 $ 2,158 — 2021 Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights 91-6029051 91-6029049 Green Green N/A $ 932 $ 693 $ 938 — 2021 Alaska Carpenters Trust Fund 92-0120866 Green Green N/A $ 328 $ 396 $ 889 — 2020 Alaska Laborers Trust Fund 91-6028298 Yellow Yellow I $ 321 $ 218 $ 126 — 2019 (1) The most recent PPA zone status available in 2018 and 2017 is for the plan's year end during 2017 and 2016, 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").

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum rental payments for operating leases	Future minimum lease payments under non-cancelable leases as of December 31, 2018 are as follows: Amount Year ended December 31, 2019 $ 10,308 2020 8,046 2021 4,648 2022 2,770 2023 2,143 Thereafter 5,290 $ 33,205

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting	Segment information for the periods presented is provided as follows: Year Ended December 31, 2018 Year Ended December 31, 2017 Marine Contract revenues $ 243,883 $ 285,736 Operating loss (61,012 ) (18,406 ) Depreciation and amortization expense (22,657 ) (20,370 ) Total assets $ 190,503 $ 260,935 Property, plant and equipment, net 128,168 128,421 Concrete Contract revenues $ 277,011 $ 292,817 Operating (loss) income (39,528 ) 19,944 Depreciation and amortization expense (9,142 ) (9,121 ) Total assets $ 122,367 $ 172,350 Property, plant and equipment, net 19,835 17,857

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	The following tables set forth selected unaudited financial information for the eight quarters in the two-year period ended December 31, 2018 . This information has been prepared on the same basis as the audited financial statements and, in the opinion of management, contains all adjustments necessary for a fair presentation. First Quarter Second Quarter Third Quarter Fourth Quarter Total Year (in thousands, except per share data) 2018 Revenues $ 136,843 $ 159,767 $ 125,073 $ 99,211 $ 520,894 Gross profit 15,822 20,769 5,938 (20,880 ) 21,649 Operating (loss) income 7,069 4,591 (7,405 ) (104,795 ) (100,540 ) (Loss) income before income taxes 5,590 3,909 (9,427 ) (106,727 ) (106,655 ) Net (loss) income 4,101 2,249 (6,356 ) (94,416 ) (94,422 ) (Loss) earnings per share: Basic $ 0.15 $ 0.08 $ (0.22 ) $ (3.32 ) $ (3.31 ) Diluted $ 0.14 $ 0.08 $ (0.22 ) $ (3.32 ) $ (3.31 ) First Quarter Second Quarter Third Quarter Fourth Quarter Total Year (in thousands, except per share data) 2017 Revenues $ 138,757 $ 137,420 $ 140,162 $ 162,214 $ 578,553 Gross profit 12,985 15,397 10,757 27,751 66,890 Operating (loss) income (1,482 ) (2,466 ) (5,354 ) 10,840 1,538 (Loss) income before income taxes (2,827 ) (3,917 ) (6,703 ) 9,306 (4,141 ) Net (loss) income (1,808 ) (2,293 ) (5,037 ) 9,538 400 (Loss) earnings per share: Basic $ (0.07 ) $ (0.08 ) $ (0.18 ) $ 0.34 $ 0.01 Diluted $ (0.07 ) $ (0.08 ) $ (0.18 ) $ 0.34 $ 0.01

Description of Business and B_2

Description of Business and Basis of Presentation (Details) - segment	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2	2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable [Abstract]
Allowance for doubtful accounts receivable	$ 4.3	$ 4.3
Contract receivable retention	30.7	$ 39.2
Retainage, long-term	$ 3.2

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Advertising (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Advertising Expense [Abstract]
Advertising expense	$ 225	$ 150	$ 178

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Depreciable Lives of Property and Equipment (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation expense									$ 28,400	$ 24,800	$ 26,900
Net (loss) income									$ (94,422)	$ 400	$ (3,620)
Diluted (in dollars per share)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.14	$ 0.34	$ (0.18)	$ (0.08)	$ (0.07)	$ (3.31)	$ 0.01	$ (0.13)
Automobiles and trucks | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									3 years
Automobiles and trucks | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									5 years
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									5 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									30 years
Construction equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									3 years
Construction equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									15 years
Dredges and dredging equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									1 year
Dredges and dredging equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									15 years
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									1 year
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									5 years
Dry-docking capitalized costs | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									3 years
Dry-docking capitalized costs | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life									15 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 0	$ 0	$ 69,483	$ 66,351
Goodwill impairment charges	$ 69,500	$ 69,483	$ 0	$ 0
Revenue growth rate implied in reporting units valuations, number of years projected		5 years
Heavy Civil Marine Construction Segment
Goodwill [Line Items]
Goodwill impairment charges		$ 33,800
Commercial Concrete Segment
Goodwill [Line Items]
Goodwill impairment charges		$ 35,700

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Intangible Assets (Details) $ in Millions	Oct. 31, 2015USD ($)
Trade Names | Estimate of Fair Value Measurement
Finite-Lived Intangible Assets [Line Items]
Intangible assets, value	$ 14

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Insurance Coverage (Details)	12 Months Ended
	Dec. 31, 2018USD ($)levelspolicy	Dec. 31, 2017USD ($)
Insurance Coverage [Line Items]
Levels of insurance coverage maintained by the Company | levels	5
Number of Insurance Policies | policy	2
Accrual for insurance liabilities	$ 5,680,000	$ 5,233,000
Heavy Civil Marine Construction Segment
Insurance Coverage [Line Items]
Levels of insurance coverage maintained by the Company | levels	5
Amount in excess of primary insurance coverage	$ 200,000,000
Heavy Civil Marine Construction Segment | Other liability policies
Insurance Coverage [Line Items]
Primary limit of insurance coverage	1,000,000
Heavy Civil Marine Construction Segment | Maritime employer's liability
Insurance Coverage [Line Items]
Primary limit of insurance coverage	10,000,000
Heavy Civil Marine Construction Segment | Watercraft pollution policy
Insurance Coverage [Line Items]
Primary limit of insurance coverage	$ 5,000,000
Commercial Concrete Segment
Insurance Coverage [Line Items]
Levels of insurance coverage maintained by the Company | levels	5
Amount in excess of primary insurance coverage	$ 200,000,000
Commercial Concrete Segment | Other liability policies
Insurance Coverage [Line Items]
Primary limit of insurance coverage	$ 1,000,000

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Major Customer [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 9,217				$ 46,006				$ 9,217	$ 46,006		$ 47,389
Billings in excess of costs and estimated earnings on uncompleted contracts	21,761				33,923				21,761	33,923		35,668
Deferred income taxes	49				13,243				49	13,243		13,167
Retained earnings	(31,861)				62,847				(31,861)	62,847		62,561
Contract revenues	99,211	$ 125,073	$ 159,767	$ 136,843	162,214	$ 140,162	$ 137,420	$ 138,757	520,894	578,553	$ 578,236
Costs of contract revenues									499,245	511,663	510,754
Gross profit	$ (20,880)	$ 5,938	$ 20,769	$ 15,822	$ 27,751	$ 10,757	$ 15,397	$ 12,985	21,649	66,890	67,482
Income tax (benefit) expense									(12,233)	(4,541)	1,581
Net (loss) income									$ (94,422)	$ 400	$ (3,620)
Basic income (loss) per share (USD per share)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.15	$ 0.34	$ (0.18)	$ (0.08)	$ (0.07)	$ (3.31)	$ 0.01	$ (0.13)
Diluted income (loss) per share (USD per share)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.14	$ 0.34	$ (0.18)	$ (0.08)	$ (0.07)	$ (3.31)	$ 0.01	$ (0.13)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Major Customer [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 10,040				$ 46,006				$ 10,040	$ 46,006
Billings in excess of costs and estimated earnings on uncompleted contracts	22,886				33,923				22,886	33,923
Deferred income taxes	(57)				13,243				(57)	13,243
Retained earnings	(32,057)				$ 62,847				(32,057)	$ 62,847
Contract revenues									519,769
Costs of contract revenues									498,422
Gross profit									21,347
Income tax (benefit) expense									(12,339)
Net (loss) income									$ (94,618)
Basic income (loss) per share (USD per share)									$ (3.32)
Diluted income (loss) per share (USD per share)									$ (3.32)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Major Customer [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	(823)								$ (823)			1,383
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,125)								(1,125)			1,745
Deferred income taxes	106								106			(76)
Retained earnings	$ 196								196			$ (286)
Contract revenues									1,125
Costs of contract revenues									823
Gross profit									302
Income tax (benefit) expense									106
Net (loss) income									$ 196
Basic income (loss) per share (USD per share)									$ 0.01
Diluted income (loss) per share (USD per share)									$ 0.01
Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts
Revenue, Major Customer [Line Items]
Contract with customer, liability, revenue recognized									$ 1,100

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied	$ 414
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied	$ 440.4

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Performance Obligation (Details)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Remaining performance obligation, percentage	94.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset		$ 0	$ 0
Subsequent Event | Minimum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 22,000
Operating lease, right-of-use asset	20,000
Subsequent Event | Maximum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	26,000
Operating lease, right-of-use asset	$ 30,000

Summary of Significant Accou_14

Summary of Significant Accounting Policies Income Taxes (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Federal income tax rate	35.00%	35.00%

Business Acquisition - Narrati

Business Acquisition - Narrative (Details) - USD ($) $ in Thousands	Apr. 10, 2017	Aug. 05, 2015	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 09, 2017
Business Acquisition [Line Items]
Federal statutory tax rate					35.00%	35.00%
Tony Bagliore Concrete, Inc. (TBC)
Business Acquisition [Line Items]
Payments to acquire businesses	$ 6,000
Contingent considerations			$ 2,000	$ 2,000
Contingent considerations, fair value							$ 456
Goodwill, net of working capital adjustment							$ 3,100
Minimum | Tony Bagliore Concrete, Inc. (TBC)
Business Acquisition [Line Items]
Property and equipment useful life		3 years
Maximum | Tony Bagliore Concrete, Inc. (TBC)
Business Acquisition [Line Items]
Property and equipment useful life		15 years

Business Acquisition - Recogni

Business Acquisition - Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Apr. 09, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 0	$ 69,483	$ 66,351
Tony Bagliore Concrete, Inc. (TBC)
Business Acquisition [Line Items]
Accounts receivable	$ 3,239
Retainage	1,860
Fixed assets, net	2,098
Other	9
Goodwill	2,562
Other intangible assets	878
Accounts payable	(2,017)
Accrued expenses and other current liabilities	(1,080)
Contingent consideration	(456)
Deferred tax liability	(1,093)
Working capital adjustment (all attributable to Goodwill)	557
Total Acquisition Consideration, Final	$ 6,000	$ 6,557

Business Acquisition - Pro Form

Business Acquisition - Pro Forma Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)$ / shares
Business Acquisition, Pro Forma Information [Abstract]
Contract revenues	$ 610,695
Operating income from continuing operations	5,593
Net loss	$ (2,677)
Basic (loss) earnings per share (USD per share) | $ / shares	$ (0.10)
Diluted (loss) earnings per share (USD per share) | $ / shares	$ (0.10)

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Contract revenues	$ 99,211	$ 125,073	$ 159,767	$ 136,843	$ 162,214	$ 140,162	$ 137,420	$ 138,757	$ 520,894	$ 578,553	$ 578,236
Marine
Disaggregation of Revenue [Line Items]
Contract revenues									243,883
Marine | Construction
Disaggregation of Revenue [Line Items]
Contract revenues									156,925
Marine | Dredging
Disaggregation of Revenue [Line Items]
Contract revenues									73,237
Marine | Specialty Services
Disaggregation of Revenue [Line Items]
Contract revenues									13,721
Concrete
Disaggregation of Revenue [Line Items]
Contract revenues									277,011
Concrete | Light Commercial
Disaggregation of Revenue [Line Items]
Contract revenues									215,628
Concrete | Structural
Disaggregation of Revenue [Line Items]
Contract revenues									60,926
Concrete | Other
Disaggregation of Revenue [Line Items]
Contract revenues									$ 457

Concentration of Risk and Ent_3

Concentration of Risk and Enterprise Wide Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Contract revenues	$ 99,211	$ 125,073	$ 159,767	$ 136,843	$ 162,214	$ 140,162	$ 137,420	$ 138,757	$ 520,894	$ 578,553	$ 578,236
Foreign
Concentration Risk [Line Items]
Contract revenues, percent									2.30%	1.60%	1.30%
Customer concentration risk | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables	108,375				124,142				$ 108,375	$ 124,142
Concentration risk, percentage									100.00%	100.00%
Customer concentration risk | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage									100.00%	100.00%	100.00%
Contract revenues									$ 520,894	$ 578,553	$ 578,236
Customer concentration risk | Federal Government | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables	2,319				3,509				$ 2,319	$ 3,509
Concentration risk, percentage									2.00%	3.00%
Customer concentration risk | Federal Government | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage									8.00%	11.00%	7.00%
Contract revenues									$ 42,143	$ 63,823	$ 40,361
Customer concentration risk | State Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables	916				4,503				$ 916	$ 4,503
Concentration risk, percentage									1.00%	3.00%
Customer concentration risk | State Governments | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage									6.00%	7.00%	7.00%
Contract revenues									$ 30,470	$ 42,613	$ 37,700
Customer concentration risk | Local Governments | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables	30,187				18,256				$ 30,187	$ 18,256
Concentration risk, percentage									28.00%	15.00%
Customer concentration risk | Local Governments | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage									21.00%	16.00%	16.00%
Contract revenues									$ 107,478	$ 91,591	$ 94,461
Customer concentration risk | Private Companies | Trade and contract retainage receivables
Concentration Risk [Line Items]
Trade and retainage receivables	$ 74,953				$ 97,874				$ 74,953	$ 97,874
Concentration risk, percentage									69.00%	79.00%
Customer concentration risk | Private Companies | Contract revenues
Concentration Risk [Line Items]
Concentration risk, percentage									65.00%	66.00%	70.00%
Contract revenues									$ 340,803	$ 380,526	$ 405,714

Contracts in Progress (Details)

Contracts in Progress (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 461,144		$ 668,848
Estimated earnings	73,170		120,751
Costs incurred and estimated earnings on uncompleted contracts	534,314		789,599
Less: Billings to date	(546,858)		(777,516)
Costs and estimated earnings in excess of billings on uncompleted contracts, net	(12,544)		12,083
Costs and estimated earnings in excess of billings on uncompleted contracts	9,217	$ 47,389	46,006
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (21,761)	$ (35,668)	$ (33,923)

Contracts in Progress - Additio

Contracts in Progress - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)project
Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 1.1
Marine
Disaggregation of Revenue [Line Items]
Number of construction projects with unfavorable changes in estimates | project	2
Decrease in revenue	$ 22.8

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 304,728	$ 299,357
Less: accumulated depreciation	(195,373)	(191,407)
Property, Pant and Equipment, Net Book Value of Depreciable Assets	109,355	107,950
Property and equipment, net	148,003	146,278
Automobiles and trucks
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,709	1,940
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,628	38,062
Construction equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	161,113	166,203
Dredges and dredging equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,217	85,113
Office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,061	8,039
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,785	245
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,863	$ 38,083

Property and Equipment Narrativ

Property and Equipment Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Long Lived Assets Held-for-sale [Line Items]
Depreciation expense		$ 28,400	$ 24,800	$ 26,900
Assets disposed of in 2017			5,400
Proceeds from sale of property and equipment		3,234	6,826	2,152
Loss on Disposition of Property Plant Equipment		$ (3,306)	(674)	(1,579)
Impairment of long-lived assets held-for-use			1,000	$ 6,400
Insurance claims pending	$ 900		900
Heavy Civil Marine Construction Segment
Long Lived Assets Held-for-sale [Line Items]
Proceeds from sale of property and equipment			4,500
Loss on Disposition of Property Plant Equipment	$ 100		$ 900

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory	$ 1,056	$ 4,386
Inventory, non-current	$ 7,598	$ 4,915

Fair Value - Narrative (Detail

Fair Value - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Life Insurance, face amount	$ 11,100
Assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	1,993	$ 1,712
Assets | Fair Value, Measurements, Recurring | 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
Assets | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash surrender value of life insurance	1,993	1,712
Assets | Fair Value, Measurements, Recurring | 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
Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	100
Liability | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	79	38
Liability | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	0	0
Liability | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	79	38
Liability | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	0	0
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debt	$ 80,500	$ 88,800

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance, January 1		$ 69,483	$ 66,351
Additions		0	3,132
Impairments	$ (69,500)	(69,483)	0	$ 0
Ending balance	$ 0	$ 0	$ 69,483	$ 66,351

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 35,240	$ 34,362
Additions	0	878
Total intangible assets, end of year	35,240	35,240
Accumulated Amortization [Roll Forward]
Accumulated amortization, January 1	(23,956)	(19,220)
Current year amortization	(3,389)	(4,736)
Total accumulated amortization	(27,345)	(23,956)
Net intangible assets, end of year	$ 7,895	$ 11,284	$ 7,900

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	Apr. 10, 2017	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Aug. 05, 2015
Finite-Lived Intangible Assets [Line Items]
Net intangible assets, end of year		$ 7,895	$ 11,284	$ 7,900
Amortization expense		3,389	$ 4,736
Tony Bagliore Concrete, Inc. (TBC) | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangibles acquired	$ 700
Acquired finite-lived intangible assets, useful life	7 years
Amortization expense		$ 3,400
Tony Bagliore Concrete, Inc. (TBC) | Contractual backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangibles acquired	$ 100
Acquired finite-lived intangible assets, useful life	7 months
Reported Value Measurement [Member] | TAS Commercial Concrete | Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value Disclosure					$ 6,900

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Future Amortization Expense of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 2,640
2020	2,069
2021	1,521
2022	1,239
2023	389
Thereafter	37
Net intangible assets, end of year	$ 7,895	$ 7,900	$ 11,284

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill impairment charges	$ 69,500	$ 69,483	$ 0	$ 0
Goodwill	$ 0	0	$ 69,483	$ 66,351
Heavy Civil Marine Construction Segment
Goodwill [Line Items]
Goodwill impairment charges		33,800
Commercial Concrete Segment
Goodwill [Line Items]
Goodwill impairment charges		$ 35,700

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Accrued salaries, wages and benefits	$ 6,492	$ 9,632
Accrual for insurance liabilities	5,680	5,233
Property taxes	924	513
Capital lease liability	3,045	0
Sales taxes	2,178	1,836
Interest	0	46
Other accrued expenses	521	613
Total accrued liabilities	$ 18,840	$ 17,873

Long-term Debt and Line of Cr_3

Long-term Debt and Line of Credit Narrative (Details) - USD ($)	Jul. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 05, 2015
Debt Instrument [Line Items]
Principal current		$ 3,000,000	$ 23,500,000
Principal, long-term		77,500,000	65,250,000
Principal		80,500,000	88,750,000
Deferred Finance Costs, current		(54,000)	(744,000)
Deferred Issuance Costs, long-term		(1,381,000)	(2,065,000)
Deferred Issuance Costs		(1,435,000)	(2,809,000)
Net Value, current		2,946,000	22,756,000
Long-term Debt, Excluding Current Maturities		76,119,000	63,185,000
Total debt		79,065,000	85,941,000
Hedging Liabilities, Noncurrent		52,000	26,000
Debt issuance cost		900,000
Amortization of debt issuance costs	$ 2,200,000	725,000	1,269,000	$ 1,225,000
Debt issuance expense		$ 700,000
Line of Credit
Debt Instrument [Line Items]
Debt, weighted average interest rate		4.63%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Principal current		$ 0	10,000,000
Principal, long-term		22,000,000	0
Deferred Finance Costs, current		0	(317,000)
Deferred Issuance Costs, long-term		(213,000)	0
Net Value, current		0	9,683,000
Long-term Debt, Excluding Current Maturities		21,787,000	0
Line of credit facility, maximum borrowing capacity		$ 65,000,000			$ 100,000,000
Stated interest rate		4.63%
Term Loan | Line of Credit
Debt Instrument [Line Items]
Total debt		$ 58,500,000
Line of credit facility, maximum borrowing capacity		60,000,000
Term loan-current | Loans Payable
Debt Instrument [Line Items]
Principal current		3,000,000	13,500,000
Deferred Finance Costs, current		(54,000)	(427,000)
Net Value, current		2,946,000	13,073,000
Term loan-long-term | Loans Payable
Debt Instrument [Line Items]
Principal, long-term		55,500,000	65,250,000
Deferred Issuance Costs, long-term		(1,168,000)	(2,065,000)
Long-term Debt, Excluding Current Maturities		$ 54,332,000	$ 63,185,000

Long-term Debt and Line of Cr_4

Long-term Debt and Line of Credit - Provisions of the Revolving Line of Credit and Accordion (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 05, 2015
Debt Instrument [Line Items]
Repayments of debt		$ 48,111,000	$ 87,813,000	$ 63,084,000
Proceeds from lines of credit		39,861,000	$ 72,000,000	$ 57,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 22,000,000	22,000,000
Remaining borrowing capacity	42,200,000	42,200,000
Repayments of debt	39,900,000
Proceeds from lines of credit		39,900,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 65,000,000	$ 65,000,000			$ 100,000,000
Minimum additional borrowing amount					1,000,000
Amount over minimum additional borrowing amount, integral multiples					250,000
Stated interest rate	4.63%	4.63%
Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					20,000,000
Letters of credit outstanding	$ 800,000	$ 800,000
Revolving Credit Facility | Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					5,000,000
Minimum additional borrowing amount					250,000
Amount over minimum additional borrowing amount, integral multiples					$ 50,000
Term Loan | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	60,000,000	60,000,000
Line of credit facility, amount outstanding	$ 58,500,000	58,500,000
Repayments of debt		$ 12,000,000

Long-term Debt and Line of Cr_5

Long-term Debt and Line of Credit - Provisions of the Term Loan (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 05, 2015
Debt Instrument [Line Items]
Quarterly principal payments		$ 8,200,000
Repayments of Debt		48,111,000	$ 87,813,000	$ 63,084,000
Current portion of debt	$ 3,000,000	3,000,000
Non-current portion of debt	55,500,000	55,500,000
Term Loan | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	58,500,000	58,500,000
Repayments of Debt		12,000,000
Line of credit facility, maximum borrowing capacity	60,000,000	60,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	22,000,000	22,000,000
Repayments of Debt	39,900,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 65,000,000	$ 65,000,000			$ 100,000,000
LIBOR | Term Loan | Line of Credit
Debt Instrument [Line Items]
Effective interest rate	4.63%	4.63%

Long-term Debt and Line of Cr_6

Long-term Debt and Line of Credit - Debt Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 79,065	$ 85,941
Term Loan | Line of Credit
Debt Instrument [Line Items]
2019	3,000
2020	3,750
2021	4,500
2022	5,250
2023	42,000
Total debt	$ 58,500

Long-term Debt and Line of Cr_7

Long-term Debt and Line of Credit - Financial Covenants (Details)	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Aug. 05, 2015
Debt Instrument [Line Items]
Debt instrument, covenant, fixed charge coverage ratio, maximum					1.25
Debt instrument, covenant, leverage ratio, maximum				3
Scenario, Forecast
Debt Instrument [Line Items]
Debt instrument, covenant, leverage ratio, maximum	3	4.75	4.75

Long-term Debt and Line of Cr_8

Long-term Debt and Line of Credit - Derivative Financial Instruments (Details) $ in Thousands	Dec. 31, 2018USD ($)	Dec. 06, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 16, 2015USD ($)contract
Debt Instrument [Line Items]
Percent of aggregate principal amount hedged		50.00%		50.00%
Interest rate swap liability	$ 52		$ 26
Swap
Debt Instrument [Line Items]
Derivative, notional amount		$ 27,000		$ 67,500
Derivative, number of instruments held (contract) | contract				5
Liability
Debt Instrument [Line Items]
Interest rate swap liability	100
Derivative, fair value, net	100
Liability | Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Derivative, fair value, net	79		38
Liability | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Derivative, fair value, net	$ 79		$ 38

Income Taxes - Narrative (Deta

Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Operating Loss Carryforwards [Line Items]
Consolidated effective tax rate									11.50%	109.70%	(77.50%)
Tax Cuts And Jobs Act Of 2017, change in tax rate, provisional income tax benefit										$ 5,900
Deferred tax liabilities, provisional income tax benefit (in usd per share)										$ 0.21
Valuation allowance	$ 11,000								$ 11,000
Valuation allowance per share (in dollars per share)	$ 0.39								$ 0.39
Goodwill impairment charges	$ 69,500								$ 69,483	$ 0	$ 0
(Loss) income before income taxes	(106,727)	$ (9,427)	$ 3,909	$ 5,590	$ 9,306	$ (6,703)	$ (3,917)	$ (2,827)	(106,655)	(4,141)	(2,039)
Goodwill impairment, permanent difference									1,200
Unrecognized tax benefit	1,614				1,614				1,614	1,614	$ 0
Retained earnings	$ (31,861)				62,847				$ (31,861)	62,847		$ 62,561
Accounting Standards Update 2016-09
Operating Loss Carryforwards [Line Items]
Retained earnings					$ 700					$ 700

Income Taxes - Components of I

Income Taxes - Components of Income Tax Expense (Benefit) by Jurisdiction and by Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. Federal
Current	$ (12)	$ (780)	$ 35
Deferred	(12,664)	(3,986)	(1,093)
Total	(12,676)	(4,766)	(1,058)
State and local
Current	183	550	511
Deferred	(471)	(180)	1,519
Total	(288)	370	2,030
Foreign
Current	731	(145)	284
Deferred	0	0	325
Total	731	(145)	609
Total Income Taxes
Current	902	(375)	830
Deferred	(13,135)
Deferred	(13,194)	(4,166)	751
Total	$ (12,233)	$ (4,541)	$ 1,581

Income Taxes - Effective Incom

Income Taxes - Effective Income Tax Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory amount (computed at 21% in 2018 and 35% in 2017 and 2016)	$ (22,398)	$ (1,449)	$ (714)
Re-measurement of deferred tax assets	0	(7,451)	0
Valuation allowance on foreign tax credits	593	1,514	0
State income tax, net of federal benefit	(1,922)	168	94
Permanent differences, other	1,550	505	99
Permanent differences, incentive stock options	(24)	447	224
Valuation allowance, other	10,384	(77)	1,769
Uncertain tax provision	0	1,614	0
Other	(416)	188	109
Unrecognized tax benefit	1,614	1,614	0
Total	$ (12,233)	$ (4,541)	$ 1,581
Consolidated effective tax rate	11.50%	109.70%	(77.50%)

Income Taxes - Components of D

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets related to:
Accrued liabilities	$ 1,105		$ 1,226
Intangible assets	3,054		3,010
Net operating loss carryforward	15,970		6,912
Valuation allowance	(14,326)		(3,942)
Non-qualified stock options	672		762
Foreign tax credits	1,489		1,751
Valuation allowance on foreign tax credits	1,489		1,514
Goodwill	8,200		0
Other	2,684		215
Total assets	17,359		8,420
Liabilities related to:
Depreciation and amortization	(16,974)		(15,788)
Goodwill	0		(5,178)
Deferred revenue on maintenance contracts	(434)		(597)
Other	0		(100)
Total liabilities	(17,408)		(21,663)
Net non-current deferred tax liabilities	$ (49)	$ (13,167)	$ (13,243)

Income Taxes - Summary of Defe

Income Taxes - Summary of Deferred Tax Asset and Liabilities, as Reported in the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Summary of Deferred Tax Assets and Liabilities, as Reported in the Balance Sheet [Abstract]
Net current deferred tax assets	$ 0		$ 0
Net non-current deferred tax liabilities	(49)	$ (13,167)	(13,243)
Total net deferred tax liabilities:	$ (49)		$ (13,243)

Income Taxes - Unrecognized Ta

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balances at beginning of the year	$ 1,614	$ 0
Additions based on tax position related to current year	0	0
Additions based on tax positions related to prior years	0	1,614
Reductions based on tax positions related to current year	0	0
Reductions based on tax positions related to prior years	0	0
Settlements with tax authorities	0	0
Lapse of statute of limitations	0	0
Balance at the end of year	$ 1,614	$ 1,614

Earnings (Loss) Per Share - Ba

Earnings (Loss) Per Share - Basic and Diluted (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic:
Weighted average shares outstanding	28,518,353	28,029,936	27,536,967
Effect of dilutive securities:
Common stock options	0	324,344	0
Total weighted average shares outstanding assuming dilution	28,518,353	28,354,280	27,536,967
Shares of common stock issued from the exercise of stock options	488,303	229,551	13,850

Earnings (Loss) Per Share - An

Earnings (Loss) Per Share - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential antidilutive securities excluded from future computations (in shares)	1,938,967	2,274,908	2,381,926
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options	0	0	0

Stock-Based Compensation - Nar

Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended
	Jul. 31, 2018	May 31, 2018	May 31, 2017	May 31, 2016	May 31, 2011	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved and authorized maximum number of shares to be issued			2,400,000
Compensation expense related to stock based awards outstanding						$ 2,200	$ 2,200	$ 2,200
Granted (in shares)						374,215	425,204	587,862
Granted (in dollars per share)						$ 7.49	$ 7.22	$ 4.98
Proceeds received upon exercise of stock options						$ 2,815	$ 1,320	$ 67
Exercise of stock options, shares						488,303	229,551	13,850
Total share-based compensation cost not yet recognized						$ 3,600
Share-based compensation cost not yet recognized, period for recognition						2 years
Total intrinsic value of options exercised						$ 1,286	$ 706	$ 53
Total fair value of shares vested						$ 705	$ 855	$ 986
Officers and Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Performance period							3 years	3 years
Weighted average grant-date fair value of options granted (in USD per share)						$ 7.49	$ 7.22	$ 4.98
Granted (in shares)						374,215	425,204	587,862
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period					10 years
Forfeiture rate applied to options						5.50%
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					3 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					5 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)						333,864	345,913	407,002
Weighted average grant date fair value (in dollars per share)						$ 7.47	$ 7.22	$ 4.96
Restricted stock | Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)		12,064	12,465	14,170
Weighted average grant date fair value (in dollars per share)		$ 7.46	$ 7.22
Restricted stock | Officers and Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years					3 years	3 years
Awards granted in period (in shares)	2,769	203,752					213,643	267,175
Weighted average grant date fair value (in dollars per share)	$ 9.03	$ 7.46					$ 7.22	$ 4.96
Performance Shares | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)		67,023	69,945	68,977
Weighted average grant date fair value (in dollars per share)		$ 7.46	$ 7.22	$ 4.94
Performance period		3 years	2 years	2 years
2017 LTIP | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate applied to options						3.20%

Stock-Based Compensation - Res

Stock-Based Compensation - Restricted Stock Activity (Details) - Restricted stock - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Shares
Beginning nonvested shares (in shares)	372,460	372,306	120,154
Granted (in shares)	333,864	345,913	407,002
Vested (in shares)	(217,244)	(225,406)	(147,259)
Forfeited/repurchased shares (in shares)	(71,139)	(120,353)	(7,591)
Ending nonvested shares (in shares)	417,941	372,460	372,306
Weighted Average Fair Value Per Share
Beginning nonvested shares (in dollars per share)	$ 6.01	$ 5.66	$ 9.28
Granted (in dollars per share)	7.47	7.22	4.96
Vested (in dollars per share)	6.61	7.25	6.62
Forfeited/repurchased shares (in dollars per share)	6.85	6.08	7.08
Ending nonvested shares (in dollars per share)	$ 7.04	$ 6.01	$ 5.66

Stock-Based Compensation - Sto

Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Shares
Beginning stock options outstanding (in shares)	1,911,121	2,349,446	2,149,900
Granted (in shares)	374,215	425,204	587,862
Exercised (in shares)	(488,303)	(229,551)	(13,850)
Forfeited (in shares)	(132,252)	(633,978)	(374,466)
Ending stock options outstanding (in shares)	1,664,781	1,911,121	2,349,446
Weighted Average Exercise Price Per Share
Beginning stock options outstanding (in dollars per share)	$ 7.79	$ 8.39	$ 9.56
Granted (in dollars per share)	7.49	7.22	4.98
Exercised (in dollars per share)	5.76	5.75	4.86
Forfeited (in dollars per share)	7.89	10.36	9.89
Ending stock options outstanding (in dollars per share)	$ 8.31	$ 7.79	$ 8.39
Vested and expected to vest at December 31, 2017
Number of Shares	1,779,990
Weighted Average Exercise Price Per Share (in dollars per share)	$ 8.15
Weighted Average Contractual Life	5 years 9 months 29 days
Aggregate Intrinsic Value	$ 15
December 31, 2018
Number of Shares	1,247,450
Weighted Average Exercise Price Per Share (in dollars per share)	$ 8.56
Weighted Average Contractual Life	4 years 6 months 4 days
Aggregate Intrinsic Value	$ 14

Stock-Based Compensation - S_2

Stock-Based Compensation - Stock Option Valuation Assumptions (Details) - Stock Option - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Weighted average grant-date fair value of options granted (in USD per share)	$ 2.78	$ 7.22	$ 4.97
Risk-free interest rate	2.65%	1.46%	1.06%
Expected volatility	51.80%	48.00%	49.00%
Expected term of options	3 years	3 years	3 years
Dividend yield	0.00%	0.00%	0.00%

Employee Benefits - Narrative

Employee Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
401 (k) Retirement Plan [Abstract]
Minimum service period for plan eligibility	6 months
Minimum allowable contribution to the plan by each employee, percent	1.00%
Maximum allowable contribution to the plan by each employee, percent	80.00%
Employers matching contribution, vesting period	4 years
Company contributions to the plan		$ 1.4	$ 1.4
Range 1
401 (k) Retirement Plan [Abstract]
Employer matching contribution, percent	100.00%
Employer matching contribution, percent of employees' gross pay	2.00%
Range 2
401 (k) Retirement Plan [Abstract]
Employer matching contribution, percent	50.00%
Employer matching contribution, percent of employees' gross pay	2.00%
AGC Southwest Chapters 401(k) Retirement Plan
401 (k) Retirement Plan [Abstract]
Employer matching contribution, percent	50.00%
Employers matching contribution, vesting period	5 years
Employer matching contribution, percent of employees' gross pay	6.00%
Employer discretionary contribution amount	$ 0.2	$ 0.4	$ 0.2

Employee Benefits - Multiemplo

Employee Benefits - Multiemployer Plans (Details) - Multiemployer Plans, Pension - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 2,482	$ 1,974	$ 2,158
Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 932	$ 693	938
Alaska Carpenters Trust Fund
Multiemployer Plans [Line Items]
Certified Zone Status	Green	Green
Contributions	$ 328	$ 396	889
Alaska Laborers Trust Fund
Multiemployer Plans [Line Items]
Certified Zone Status	Yellow	Yellow
Contributions	$ 321	$ 218	$ 126

Commitments and Contingencies

Commitments and Contingencies - Narrative (Details)	3 Months Ended	12 Months Ended			14 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Oct. 31, 2016defendant
Operating Leases, Rent Expense, Net [Abstract]
Operating leases, rent expense		$ 2,000,000	$ 1,700,000	$ 1,000,000
Proceeds from legal settlements	$ 5,500,000
Increase (decrease) in notes receivable, current		800,000
Increase (decrease) in notes receivable		$ 3,000,000
Office building
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		9 years
Vehicles
Operating Leases, Rent Expense, Net [Abstract]
Operating leases, rent expense		$ 1,000,000	$ 700,000	$ 1,500,000
Other facilities | Minimum
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		1 year
Other facilities | Maximum
Operating Leases, Rent Expense, Net [Abstract]
Lease term of assets subject to operating leases		5 years
Houston Police Department, Environmental Enforcement | Pending Litigation
Operating Leases, Rent Expense, Net [Abstract]
Number of defendants | defendant					2
Estimate of possible loss		$ 250,000
Settlement agreement, plea bargain declined		$ 75,000

Commitments and Contingencies_2

Commitments and Contingencies - Operating Leases Future Minimum Payments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 10,308
2020	8,046
2021	4,648
2022	2,770
2023	2,143
Thereafter	5,290
Total	$ 33,205

Segment Information (Details)

Segment Information (Details)

3 Months Ended

6 Months Ended

12 Months Ended

Dec. 31, 2018USD ($)

Sep. 30, 2018USD ($)

Jun. 30, 2018USD ($)

Mar. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Sep. 30, 2017USD ($)

Jun. 30, 2017USD ($)

Mar. 31, 2017USD ($)

Dec. 31, 2015segment

Dec. 31, 2018USD ($)segment

Dec. 31, 2017USD ($)

Dec. 31, 2016USD ($)

Segment Reporting Information [Line Items]

Contract revenues

$ 99,211,000

$ 125,073,000

$ 159,767,000

$ 136,843,000

$ 162,214,000

$ 140,162,000

$ 137,420,000

$ 138,757,000

$ 520,894,000

$ 578,553,000

$ 578,236,000

Number of reportable segments | segment

2

2

Intersegment Eliminations

Segment Reporting Information [Line Items]

Contract revenues

$ 2,500,000

0

Heavy Civil Marine Construction Segment

Segment Reporting Information [Line Items]

Contract revenues

243,883,000

Heavy Civil Marine Construction Segment | Mexico and the Caribbean

Segment Reporting Information [Line Items]

Contract revenues

$ 12,200,000

$ 9,400,000

Segment Information - Summary (

Segment Information - Summary (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Contract revenues	$ 99,211	$ 125,073	$ 159,767	$ 136,843	$ 162,214	$ 140,162	$ 137,420	$ 138,757	$ 520,894	$ 578,553	$ 578,236
Operating (loss) income	(104,795)	$ (7,405)	$ 4,591	$ 7,069	10,840	$ (5,354)	$ (2,466)	$ (1,482)	(100,540)	1,538	4,074
Depreciation and amortization									(31,799)	(29,491)	$ (34,162)
Assets	312,870				433,285				312,870	433,285
Property and equipment, net	148,003				146,278				148,003	146,278
Heavy Civil Marine Construction Segment
Segment Reporting Information [Line Items]
Contract revenues									243,883
Commercial Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues									277,011
Operating Segments | Heavy Civil Marine Construction Segment
Segment Reporting Information [Line Items]
Contract revenues									243,883	285,736
Operating (loss) income									(61,012)	(18,406)
Depreciation and amortization									(22,657)	(20,370)
Assets	190,503				260,935				190,503	260,935
Property and equipment, net	128,168				128,421				128,168	128,421
Operating Segments | Commercial Concrete Segment
Segment Reporting Information [Line Items]
Contract revenues									277,011	292,817
Operating (loss) income									(39,528)	19,944
Depreciation and amortization									(9,142)	(9,121)
Assets	122,367				172,350				122,367	172,350
Property and equipment, net	$ 19,835				$ 17,857				$ 19,835	$ 17,857

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Operating leases, rent expense	$ 2,000	$ 1,700	$ 1,000
Affiliated Entity | Lease Arrangement
Related Party Transaction [Line Items]
Operating leases, annual lease amount	$ 478
Operating leases, rent expense		$ 820

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Revenues	$ 99,211	$ 125,073	$ 159,767	$ 136,843	$ 162,214	$ 140,162	$ 137,420	$ 138,757	$ 520,894	$ 578,553	$ 578,236
Gross profit	(20,880)	5,938	20,769	15,822	27,751	10,757	15,397	12,985	21,649	66,890	67,482
Operating (loss) income	(104,795)	(7,405)	4,591	7,069	10,840	(5,354)	(2,466)	(1,482)	(100,540)	1,538	4,074
(Loss) income before income taxes	(106,727)	(9,427)	3,909	5,590	9,306	(6,703)	(3,917)	(2,827)	(106,655)	(4,141)	$ (2,039)
Net (loss) income	$ (94,416)	$ (6,356)	$ 2,249	$ 4,101	$ 9,538	$ (5,037)	$ (2,293)	$ (1,808)	$ (94,422)	$ 400
Earnings Per Share, Basic and Diluted [Abstract]
Basic (USD per share)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.15	$ 0.34	$ (0.18)	$ (0.08)	$ (0.07)	$ (3.31)	$ 0.01	$ (0.13)
Diluted income (loss) per share (USD per share)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.14	$ 0.34	$ (0.18)	$ (0.08)	$ (0.07)	$ (3.31)	$ 0.01	$ (0.13)

Schedule II - Valuation And Q_2

Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Provision for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	$ 0	$ 0	$ 0
Charged to Revenue, Cost or Expense	4,280	0	0
Deduction	0	0	0
Balance at the End of the Period	4,280	0	0
Reserve for losses on uncompleted contracts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	0	0	0
Charged to Revenue, Cost or Expense	22,770	0	0
Deduction	0	0	0
Balance at the End of the Period	$ 22,770	$ 0	$ 0

Uncategorized Items - orn-20181

Label	Element	Value
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (286,000)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (286,000)