Infrastructure and Energy Alternatives (IEA) 10-Q 7 May 20 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 07, 2020
Document and Entity Information [Abstract]
Entity Registrant Name	Infrastructure & Energy Alternatives, Inc.
Entity Central Index Key	0001652362
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Amendment Flag	false
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		22,506,233

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 58,081	$ 147,259
Accounts receivable, net	154,699	203,645
Contract Assets	193,851	179,303
Prepaid expenses and other current assets	22,178	16,855
Total current assets	428,809	547,062
Property, plant and equipment, net	134,753	140,488
Operating Lease, Right-of-Use Asset	43,444	43,431
Intangible Assets, Net (Excluding Goodwill)	33,902	37,272
Goodwill	37,373	37,373
Company-owned life insurance	4,153	4,752
Deferred Income Tax Assets, Net	14,072	12,992
Other Assets, Noncurrent	492	1,551
Total assets	696,998	824,921
Current liabilities:
Accounts Payable, Current	110,485	177,783
Accrued Liabilities, Current	121,445	158,103
Contract Liabilities	107,253	115,634
Current portion of finance lease obligations	23,437	23,183
Operating Lease, Liability, Current	10,191	9,628
Current portion of long-term debt	1,693	1,946
Total current liabilities	374,504	486,277
Finance lease obligations, less current portion	37,826	41,055
Operating Lease, Liability, Noncurrent	34,131	34,572
Long-term Debt	154,788	162,901
Debt - Series B Preferred Stock	175,145	166,141
Series B Preferred Stock - warrant obligations	2,200	17,591
Deferred compensation	6,593	8,004
Total liabilities	785,187	916,541
Commitments and contingencies:
Series A Preferred Stock, par value, $0.0001 per share; 100,000,000 shares authorized; 17,483 shares and 17,483 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	17,483	17,483
Stockholders' equity (deficit):
Common stock, par value, $0.0001 per share; 100,000,000 shares authorized; 20,700,555 and 20,460,533 shares issued and 20,648,793 and 20,446,811 outstanding at March 31, 2020 and December 31, 2019, respectively	2	2
Treasury stock, 51,762 and 13,722 shares at cost at March 31, 2020 and December 31, 2019, respectively.	(160)	(76)
Additional paid in capital	33,425	17,167
Retained earnings (deficit)	(138,939)	(126,196)
Total stockholders' equity (deficit)	(105,672)	(109,103)
Total liabilities and stockholders' equity (deficit)	$ 696,998	$ 824,921

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	17,483	17,483
Preferred stock, shares outstanding	17,483	17,483
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares, issued	20,700,555	20,460,533
Common stock, shares, outstanding	20,648,793	20,446,811
Treasury Stock, Shares	51,762	13,722

Condensed Consolidated Statemen

Condensed Consolidated Statement of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 358,163	$ 189,781
Cost of revenue	325,122	184,037
Gross profit	33,041	5,744
Selling, general and administrative expenses	29,484	27,754
Income (loss) from operations	3,557	(22,010)
Other income (expense), net:
Interest expense, net	(16,065)	(10,367)
Other expense	(1,102)	(170)
Loss before benefit for income taxes	(13,610)	(32,547)
Benefit for income taxes	867	8,908
Net loss	$ (12,743)	$ (23,639)
Earnings Per Share, Basic	$ (0.66)	$ (1.09)
Earnings Per Share, Diluted	$ (0.66)	$ (1.09)
Weighted Average Number of Shares Outstanding, Basic	20,522,216	22,188,757
Weighted Average Number of Shares Outstanding, Diluted	20,522,216	22,188,757

Condensed Statements of Stockho

Condensed Statements of Stockholders Equity (Deficit) Statement - USD ($) shares in Thousands	Total	Common Stock [Member]	Common Stock [Member]Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Common Stock [Member]	Treasury Stock [Member]	Treasury Stock [Member]Treasury Stock [Member]	Retained Earnings [Member]
Beginning Balance Shares, Issued at Dec. 31, 2018		22,155				0
Beginning Balance Stockholder's equity at Dec. 31, 2018	$ (131,178,000)	$ 2,000		$ 4,751,000		$ 0		$ (135,931,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(23,639,000)							(23,639,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,040,000			1,040,000
Stock Issued During Period, Shares, New Issues			111
Stock Issued During Period, Value, New Issues	159,000	$ 0			$ 235,000
Adjustments to Additional Paid in Capital, Business Combination	(2,754,000)							(2,754,000)
Effect of Change in Accounting Principle Topic 606	750,000							750,000
Treasury Stock, Shares							(14)
Dividends, Preferred Stock, Stock	(525,000)			(525,000)
Ending Balance Shares, Issued at Mar. 31, 2019		22,266				(14)
Ending Balance Stockholder's equity at Mar. 31, 2019	(150,639,000)	$ 2,000		5,501,000		$ (76,000)		(156,066,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Value							$ (76,000)
Beginning Balance Shares, Issued at Dec. 31, 2019		20,461				(14)
Beginning Balance Stockholder's equity at Dec. 31, 2019	(109,103,000)	$ 2,000		17,167,000		$ (76,000)		(126,196,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12,743,000)							(12,743,000)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,113,000			1,113,000
Stock Issued During Period, Shares, New Issues			240
Stock Issued During Period, Value, New Issues	196,000	$ 0			$ 280,000
Adjustments to Additional Paid in Capital, Warrant Issued	15,631,000			15,631,000
Treasury Stock, Shares							(38)
Dividends, Preferred Stock, Stock	(766,000)			(766,000)
Ending Balance Shares, Issued at Mar. 31, 2020		20,701				(52)
Ending Balance Stockholder's equity at Mar. 31, 2020	$ (105,672,000)	$ 2,000		$ 33,425,000		$ (160,000)		$ (138,939,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Value							$ (84,000)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (12,743)	$ (23,639)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	11,888	12,017
Fair Value Adjustment of Warrants	1,057	0
Amortization of Other Deferred Charges	2,237	1,239
Share-based compensation expense	1,113	1,040
Deferred compensation	(1,371)	735
Accrued dividends on Series B Preferred Stock	7,959	0
Deferred income taxes	(1,080)	(8,908)
Other Operating Activities, Cash Flow Statement	733	168
Change in operating assets and liabilities:
Accounts receivable	48,931	82,383
Increase (Decrease) in Contract with Customer, Asset	14,548	12,405
Prepaid expenses and other assets	(5,212)	(3,149)
Accounts payable and accrued liabilities	(104,760)	(110,060)
Increase (Decrease) in Contract with Customer, Liability	(8,381)	23,032
Net cash used in operating activities	(74,177)	(37,547)
Cash flow from investing activities:
Company-owned life insurance	599	(202)
Purchases of property, plant and equipment	(2,231)	(1,908)
Proceeds from sale of property, plant and equipment	1,719	47
Net cash provided by (used in) investing activities	87	(2,063)
Cash flows from financing activities:
Proceeds from Long-term Lines of Credit	46,000	9,400
Repayments of Long-term Lines of Credit	(55,853)	(16,151)
Payments on finance lease obligations	(5,781)	(4,289)
Sale Leaseback Transaction, Net Proceeds, Financing Activities	0	24,343
Proceeds from Convertible Debt	350	0
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised	196	159
Merger recapitalization transaction	0	2,754
Net cash provided by (used in) financing activities	(15,088)	16,216
Net change in cash and cash equivalents	(89,178)	(23,394)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Period Start	147,259	71,311
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Period End	58,081	47,917
Supplemental disclosure of cash and non-cash transactions:
Interest Paid, Excluding Capitalized Interest, Operating Activities	6,053	9,168
Income Taxes Paid, Net	(229)	190
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	2,806	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2,732	971
Dividends, Preferred Stock	$ 766	$ 525

Business, Basis of Presentation

Business, Basis of Presentation and Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]	Business, Basis of Presentation and Significant Accounting Policies Organization and Reportable Segments Infrastructure and Energy Alternatives, Inc., a Delaware corporation, is a holding company organized on August 4, 2015 (together with its wholly-owned subsidiaries, “IEA” or the “Company”). On March 26, 2018, we became a public company by consummating a merger (the “Merger”) pursuant to an Agreement and Plan of Merger, dated November 3, 2017, with M III Acquisition Corporation (“M III”). As of December 31, 2019, the Company's total annual gross revenues exceeded $1.07 billion and we are no longer an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act (the “JOBS Act”). We segregate our business into two reportable segments: the Renewables segment and the Specialty Civil segment. See Note 10. Segments for a description of the reportable segments and their operations. COVID-19 Pandemic During March 2020, the World Health Organization declared a global pandemic related to the rapidly growing outbreak of a novel strain of c oronavirus ( “ COVID-19 ” ). The COVID-19 pandemic has significantly affected economic conditions in the United States and internationally as national, state and local governments reacted to the public health crisis by requiring mitigation measures that have disrupted business activities for an uncertain period of time. The effects of the COVID-19 pandemic could affect the Company’s future business activities and financial results, including; reduced crew productivity, contract amendments/cancellations, higher operating costs and/or delayed project start dates or project shutdowns that may be requested or mandated by governmental authorities or others. The effects of the COVID-19 pandemic on the Company’s financial results for the three months ended March 31, 2020 has had no negative material impact. Most of the Company’s construction services are currently deemed essential under governmental mitigation orders and substantially all of its business segments continue to operate. Management’s top priority has been to take appropriate actions to protect the health and safety of its employees, customers and business partners, including adjusting its standard operating procedures to respond to evolving health guidelines. Management believes that it is taking appropriate steps to mitigate any potential impact to the Company; however, given the uncertainty regarding the potential effects of the COVID-19 pandemic, any future impacts cannot be quantified or predicted with specificity. Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions for Quarterly Reports on Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The unaudited condensed consolidated financial statements include the accounts of IEA and its wholly-owned direct and indirect domestic and foreign subsidiaries and in the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) that are necessary to present fairly the results of operations for the interim periods presented. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020 . These financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2019 and notes thereto included in the Company’s 2019 Annual Report on Form 10-K. Basis of Accounting and Use of Estimates The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP. The preparation of the condensed consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and the accompanying notes. Key estimates include: the recognition of revenue and project profit or loss; fair value estimates, including those related to Series B Preferred Stock; valuations of goodwill and intangible assets; asset lives used in computing depreciation and amortization; accrued self-insured claims; other reserves and accruals; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that its estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations, actual results could differ materially from those estimates. Revenue Recognition The Company adopted the requirements of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which is also referred to as Accounting Standards Codification (“ASC”) Topic 606, under the modified retrospective transition approach effective January 1, 2019, with application to all existing contracts that were not substantially completed as of January 1, 2019. The Company adopted this standard for interim periods beginning after December 31, 2019, and recorded adjustments to the previously issued quarterly financial statements for the three months ended March 31, 2019. The impacts of adoption on the Company’s retained earnings on January 1, 2019 was primarily related to variable consideration on unapproved change orders. The cumulative impact of adopting Topic 606 required net adjustments of $750,000 to the statement of operations between revenue, cost of revenue and income taxes, thereby reducing income in the March 31, 2019 quarterly financial statements and reducing the December 31, 2019 accumulated deficit. The Company also adjusted the cashflow statement as of March 31, 2019, to reflect adoption. Under Topic 606, revenue is recognized when control of promised goods and services is transferred to customers, and the amount of revenue recognized reflects the consideration to which an entity expects to be entitled in exchange for the goods and services transferred. Revenue is recognized by the Company primarily over time utilizing the cost-to-cost measure of progress for fixed price contracts and are based on cost for time and materials and other service contracts, consistent with the Company’s previous revenue recognition practices. Contracts The Company derives revenue primarily from construction projects performed under contracts for specific projects requiring the construction and installation of an entire infrastructure system or specified units within an infrastructure system. The contracts contain multiple pricing options, including fixed price, time and materials, or unit price. Renewable energy projects are performed for private customers while our Specialty Civil projects are performed for a mix of various governmental entities. Revenue derived from projects billed on a fixed-price basis totaled 96.0% and 90.2% of consolidated revenue from operations for the three months ended March 31, 2020 and 2019 , respectively. Revenue and related costs for construction contracts billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects billed on a time and materials basis totaled 4.0% and 9.8% of consolidated revenue from operations for the three months ended March 31, 2020 and 2019 , respectively. Revenue from construction contracts is recognized over time using the cost-to-cost measure of progress for fixed price construction contracts. For these contracts, the cost-to-cost measure of progress best depicts the continuous transfer of control of goods or services to the customer. The contractual terms provide that the customer compensates the Company for services rendered. Contract costs include all direct materials, labor and subcontracted costs, as well as indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment. The cost estimation and review process for recognizing revenue over time under the cost-to-cost method is based on the professional knowledge and experience of the Company’s project managers, engineers and financial professionals. Management reviews estimates of total contract transaction price and total project costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected variable consideration are factors that influence estimates of the total contract transaction price, total costs to complete those contracts and profit recognition. Changes in these factors could result in revisions to revenue and costs of revenue in the period in which the revisions are determined on a prospective basis, which could materially affect the Company’s condensed consolidated results of operations for that period. Provisions for losses on uncompleted contracts are recorded in the period in which such losses are determined. Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account under Topic 606. The transaction price of a contract is allocated to a distinct performance obligation and recognized as revenue when or as the performance obligation is satisfied. The Company’s contracts often require significant integrated services and, even when delivering multiple distinct services, are generally accounted for as a single performance obligation. Contract amendments and change orders are generally not distinct from the existing contract due to the significant integrated service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. With the exception of certain Specialty Civil service contracts, the majority of the Company’s performance obligations are completed within one year. When more than one contract is entered into with a customer on or close to the same date, the Company evaluates whether those contracts should be combined and accounted for as a single contract as well as whether those contracts should be accounted for as more than one performance obligation. This evaluation requires significant judgment and is based on the facts and circumstances of the various contracts, which could change the amount of revenue and profit recognition in a given period depending upon the outcome of the evaluation. Remaining performance obligations represent the amount of unearned transaction prices for contracts, including approved and unapproved change orders. As of March 31, 2020, the amount of the Company’s remaining performance obligations was $1,238.5 million . The Company expects to recognize approximately 81.6% of its remaining performance obligations as revenue during 2020. Revenue recognized from performance obligations satisfied in previous periods was ($2.0) million and $2.8 million , for the three months ended March 31, 2020 and 2019, respectively. Variable Consideration Transaction pricing for the Company’s contracts may include variable consideration, such as unapproved change orders, claims, incentives and liquidated damages. Management estimates variable consideration for a performance obligation utilizing estimation methods that best predict the amount of consideration to which the Company will be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Management’s estimates of variable consideration and determination of whether to include estimated amounts in transaction price are based on legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer and all other relevant information that is reasonably available. The effect of a change in variable consideration on the transaction price of a performance obligation is typically recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders, claims and liquidated damages reflected in transaction price are not resolved in the Company’s favor, or to the extent incentives reflected in transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue. As of March 31, 2020 and year ended December 31, 2019 , the Company included approximately $60.2 million and $73.3 million , respectively, of unapproved change orders and/or claims in the transaction price for certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These transaction price adjustments are included within Contract Assets or Contract Liabilities as appropriate. The Company actively engages with its customers to complete the final change order approval process, and generally expects these processes to be completed within one year. Amounts ultimately realized upon final acceptance by customers could be higher or lower than such estimated amounts. Disaggregation of Revenue The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue: (in thousands) Three months ended March 31, 2020 March 31, 2019 Renewables Wind $ 248,537 $ 72,034 Solar 209 1,997 $ 248,746 $ 74,031 Specialty Civil Heavy civil $ 41,222 $ 50,115 Rail 47,057 42,609 Environmental 21,138 23,026 $ 109,417 $ 115,750 Concentrations The Company had the following approximate revenue and accounts receivable concentrations, net of allowances, for the periods ended: Revenue % Three months ended Accounts Receivable % 2020 2019 March 31, 2020 December 31, 2019 Company A (Specialty Civil Segment) * 21.1 % * * Company B (Renewable Segment) * 11.9 % * * Company C (Renewables Segment) 11.5 % * * * Company D (Renewables Segment) 11.1 % * * * * Amount was not above 10% threshold Recently Adopted Accounting Standards - Guidance Adopted in 2020 In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820), Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which eliminates certain disclosure requirements for recurring and non-recurring fair value measurements, such as the amount of and reason for transfers between Level 1 and Level 2 of the fair value hierarchy, and adds new disclosure requirements for Level 3 measurements. ASU 2018-13 is effective for all entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. Certain disclosures per ASU 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. We adopted the standard on January 1, 2020, and it did not have an impact on our disclosures for fair value measurements. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842) , ” which is effective for annual reporting periods beginning after December 15, 2018. Under Topic 842, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: i) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and ii) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Topic 842 requires entities to adopt the new lease standard using a modified retrospective method and initially apply the related guidance at the beginning of the earliest period presented in the financial statements. The Company adopted Topic 842 using the modified retrospective method as of January 1, 2019 and for interim periods beginning after December 31, 2019, without adjusting comparative periods in the financial statements. The most significant effect of the new guidance was the recognition of operating lease right-of-use assets and a liability for operating leases as of December 31, 2019. The accounting for finance leases (capital leases) was substantially unchanged. The Company elected to utilize the package of practical expedients that allowed entities to: (1) not reassess whether any expired or existing contracts were or contained leases; (2) retain the existing classification of lease contracts as of the date of adoption; (3) not reassess initial direct costs for any existing leases; and (4) not separate non-lease components for all classes of leased assets. Recently Issued Accounting Standards Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial assets, including trade accounts receivables. The expected credit loss methodology under ASU 2016-13 is based on historical experience, current conditions and reasonable and supportable forecasts, and replaces the probable/incurred loss model for measuring and recognizing expected losses under current GAAP. The ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The ASU and its related clarifying updates are effective for smaller reporting companies for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years, with early adoption permitted. We are still evaluating the new standard but do not expect it to have a material impact on our estimate of the allowance for uncollectable accounts. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. This ASU is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Depending on the amendment, adoption may be applied on the retrospective, modified retrospective, or prospective basis. We are currently evaluating the potential effects of adopting the provisions of ASU No. 2019-12. Management has evaluated other recently issued accounting pronouncements and does not believe that they will have a significant impact on the financial statements and related disclosures.

Contract Assets and Liabilities

Contract Assets and Liabilities	3 Months Ended
	Mar. 31, 2020
Contractors [Abstract]
Contract Assets and Liabilities	Contract Assets and Liabilities The timing of when we bill our customers is generally dependent upon agreed-upon contractual terms, milestone billings based on the completion of certain phases of the work, or when services are provided. Sometimes, billing occurs subsequent to revenue recognition, resulting in unbilled revenue, which is a contract asset. Also, we sometimes receive advance payments or deposits from our customers before revenue is recognized, resulting in deferred revenue, which is a contract liability. Contract assets in the Condensed Consolidated Balance Sheets represent the following: • costs and estimated earnings in excess of billings, which arise when revenue has been recorded but the amount has not been billed; and • retainage amounts for the portion of the contract price billed by us for work performed but held for payment by the customer as a form of security until we reach certain construction milestones or complete the project. Contract assets consist of the following: (in thousands) March 31, 2020 December 31, 2019 Costs and estimated earnings in excess of billings on uncompleted contracts $ 106,285 $ 91,543 Retainage receivable 87,566 87,760 193,851 179,303 Contract liabilities consist of the following: (in thousands) March 31, 2020 December 31, 2019 Billings in excess of costs and estimated earnings on uncompleted contracts $ 107,207 $ 115,570 Loss on contracts in progress 46 64 $ 107,253 $ 115,634 The contract receivables amount as of March 31, 2020 and December 31, 2019 includes unapproved change orders of approximately $9.2 million for which the Company is pursuing settlement through dispute resolution. Revenue recognized for the three months ended March 31, 2020 and 2019 that was included in the contract liability balance at the beginning of each year was approximately $90.9 million and $31.9 million , respectively. Activity in the allowance for doubtful accounts for the periods indicated is as follows: Three Months Ended March 31, (in thousands) 2020 2019 Allowance for doubtful accounts at beginning of period $ 75 $ 42 Plus: provision for (reduction in) allowance 14 30 Less: write-offs, net of recoveries — — Allowance for doubtful accounts at period end $ 89 $ 72

Property, plant and equipment,

Property, plant and equipment, net	3 Months Ended
	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	Property, Plant and Equipment, Net Property, plant and equipment consisted of the following: (in thousands) March 31, 2020 December 31, 2019 Buildings and leasehold improvements $ 3,051 $ 2,919 Land 17,600 17,600 Construction equipment 175,707 173,434 Office equipment, furniture and fixtures 3,537 3,487 Vehicles 5,375 6,087 205,270 203,527 Accumulated depreciation (70,517 ) (63,039 ) Property, plant and equipment, net $ 134,753 $ 140,488 Depreciation expense of property, plant and equipment was $8,516 and $8,476 for the three months ended March 31, 2020 and 2019 , respectively.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net (Notes)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Goodwill and Intangible Assets, Net The following table provides the changes in the carrying amount of goodwill: (in thousands) Renewables Specialty Civil Total January 1, 2019 $ 3,020 $ 37,237 $ 40,257 Acquisition adjustments — (2,884 ) (2,884 ) December 31, 2019 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — March 31, 2020 $ 3,020 $ 34,353 $ 37,373 Intangible assets consisted of the following as of the dates indicated: March 31, 2020 December 31, 2019 ($ in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Customer relationships $ 26,500 $ (5,642 ) $ 20,858 5.75 years $ 26,500 $ (4,695 ) $ 21,805 6 years Trade name 13,400 (3,990 ) 9,410 3.75 years 13,400 (3,305 ) 10,095 4 years Backlog 13,900 (10,266 ) 3,634 9 months 13,900 (8,528 ) 5,372 1 year $ 53,800 $ (19,898 ) $ 33,902 $ 53,800 $ (16,528 ) $ 37,272 Amortization expense associated with intangible assets for the three months ended March 31, 2020 and 2019 , totaled $3.4 million and $3.5 million , respectively. The following table provides the annual intangible amortization expense currently expected to be recognized for the years 2020 through 2024: (in thousands) Remainder of 2020 2021 2022 2023 2024 Amortization expense $ 11,837 $ 6,466 $ 6,466 $ 5,841 $ 3,785

Fair value of financial instrum

Fair value of financial instruments	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair value of financial instruments	Fair Value of Financial Instruments The Company applies ASC 820, Fair Value Measurement, which establishes a framework for measuring fair value. ASC 820 defines fair value as an exit price, which is the price that would be received for an asset or paid to transfer a liability in the Company’s principal or most advantageous market in an orderly transaction between market participants on the measurement date. The fair value hierarchy established in ASC 820 generally requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Observable inputs reflect the assumptions that market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the entity’s own assumptions based on market data and the entity’s judgments about the assumptions that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The valuation hierarchy is composed of three levels. The classification within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The levels within the valuation hierarchy are described below: Level 1 — Assets and liabilities with unadjusted, quoted prices listed on active market exchanges. Inputs to the fair value measurement are observable inputs, such as quoted prices in active markets for identical assets or liabilities. Level 2 — Inputs to the fair value measurement are determined using prices for recently traded assets and liabilities with similar underlying terms, as well as direct or indirect observable inputs, such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 — Inputs to the fair value measurement are unobservable inputs, such as estimates, assumptions, and valuation techniques when little or no market data exists for the assets or liabilities. The following table sets forth information regarding the Company's assets measured at fair value on a recurring basis: March 31, 2020 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Liabilities Series B Preferred Stock - Series A Conversion Warrants and Exchange Warrants $ — $ — $ 1,800 $ 1,800 $ — $ — $ 4,317 $ 4,317 Series B-1 Preferred Stock - Additional 6% Warrants — — 400 400 — — 400 400 Series B-3 Preferred - Closing Warrants — — — — — — 11,491 11,491 Rights Offering — — — — — — 1,383 1,383 Total liabilities $ — $ — $ 2,200 $ 2,200 $ — $ — $ 17,591 $ 17,591 The following is a reconciliation of the beginning and ending balances of recurring fair value measurements using Level 3 inputs: (in thousands) Series B Preferred - Series A Conversion Warrants and Exchange Warrants Series B-1 Preferred Stock - Additional 6% Warrants Series B-3 Preferred - Closing Warrants Rights Offering Beginning Balance, December 31, 2019 $ 4,317 $ 400 $ 11,491 $ 1,383 Fair value adjustment - (gain) loss recognized in other income (91 ) — 1,677 (1,383 ) Transfer to non-recurring fair value instrument (equity) (2,426 ) — (13,168 ) — Ending Balance, March 31, 2020 $ 1,800 $ 400 $ — $ — The Company entered into three Equity Commitment agreements at various dates during 2019 with Ares Management, LLC, on behalf of its affiliated funds, investment vehicles and/or managed accounts (“Ares”) and funds managed by Oaktree Capital Management (“Oaktree”). These resulted in Series B-1 Preferred Stock (the “Series B-1 Preferred Stock”), Series B-2 Preferred Stock (the “Series B-2 Preferred Stock”) and Series B-3 Preferred Stock (the “Series B-3 Preferred Stock”) (collectively referred to as “Series B Preferred Stock”). The information below describes the balance sheet classification and the recurring/nonrecurring fair value measurement: Series B Preferred Stock (non-recurring) - The Series B Preferred Stock was a mandatorily redeemable financial instrument under ASC 480 and was recorded at relative fair value as debt which was estimated using a discounted cashflow model based on certain significant unobservable inputs, such as accumulated dividend rates, and projected Adjusted EBITDA for the life of the Series B Preferred Stock. The fair value of the liability for each of the transactions, was a combined $153.7 million and recorded on the balance sheet as debt as of March 31, 2020. Series B Preferred Stock - Warrants at closing (non-recurring) - The Warrants at closing, with an exercise price of $0.0001 , represented (on an if-converted to common stock basis) 10% of the issued and outstanding common stock of the Company based on the Company’s fully diluted share count on May 20, 2019 (including the number of shares of common stock that may be issued pursuant to all restricted stock awards, restricted stock units, stock options and any other securities or rights (directly or indirectly) convertible into, exchangeable for or to subscribe for common stock that are outstanding on May 20, 2019 (excluding any shares of common stock issuable (a) pursuant to the merger agreement for our business combination, (b) upon conversion of shares of Series A Preferred Stock, (c) upon the exercise of any warrant with an exercise price of $11.50 or higher or (d) upon the exercise of any equity issued pursuant to the Company’s long term incentive plan or other equity plan with a strike price of $11.50 or higher). The 2,545,934 warrants at closing were valued at the closing stock price of $4.21 on May 20, 2019 which was recorded as additional paid in capital. On August 30, 2019, warrants for 900,000 shares of common stock were issued and were valued at the closing stock price of $3.75 which was recorded as additional paid in capital. On November 14, 2019, warrants for 3,568,750 shares of common stock were issued and were valued at the closing stock price of $2.20 and these were recorded as a liability (Series B-3 Preferred - Closing Warrants) and marked to market at December 31, 2019 at a price of $3.22 . On January 21, 2020 the Company received shareholder approval for the warrants and the liability was marked to market at a price of $3.69 . Upon shareholder approval, the warrants were moved from liability to equity at a fair value of $13,168 on a non-recurring basis. Series B-3 Exchange Warrants (non-recurring) - On October 29, 2019, the holders of Series A Preferred Stock converted 50% of their shares to Series B Preferred Stock and reduced the number of the potential additional warrants. In the exchange the holders of Series A Preferred Stock were issued warrants for 657,383 shares of common stock at the closing stock price of $2.20 and these were recorded as a liability and marked to market at December 31, 2019 at a price of $3.22 . On January 21, 2020 the Company received shareholder approval for the warrants and the liability was marked to market at a price of $3.69 . As of March 31, 2020, these warrants reside as part of equity at a fair value of $2,426 on a non-recurring basis. Series B-1 Preferred Stock - Series A Conversion Warrants (recurring) - On May 20, 2019, the conversion rights for the Series A Preferred Stock were amended to allow the holders of Series A Preferred Stock to convert all or any portion of Series A Preferred Stock outstanding at any point in time. If converted, the holders of the Series B Preferred Stock would be entitled to additional warrants, with an exercise price of $0.0001 . These warrants were fair valued using the closing stock price of $4.21 on May 20, 2019, at an estimated if-converted share count and recorded as a liability. Series B-1 Preferred Stock - Additional 6% Warrants (recurring) - The Additional 6% Warrants are issuable if the Company fails to meet certain Adjusted EBITDA thresholds on a trailing twelve-month basis from May 31, 2020 through April 30, 2021. The Company recorded the Additional 6% Warrants at fair value, which was estimated using a Monte Carlo Simulation based on certain significant unobservable inputs, such as a risk rate premium, Adjusted EBITDA volatility, stock price volatility and projected Adjusted EBITDA for the Company for 2019. The Additional 6% Warrants were recorded as a liability. Rights offering - The Company conducted a rights offering and each shareholder as of the record date was issued a right to purchase Series B Preferred Stock and warrants. The right that was issued was fair valued using a Black-Scholes model based on certain significant unobservable inputs, such as a risk rate premium, stock price volatility, dividend yield and expected term of rights offering. The rights offering fair value was recorded as a liability and was a deemed dividend to common stockholders and reflected as a reduction in additional paid in capital. On March 4, 2020 we completed the rights offering, removed the liability associated with the fair value (rights offering - recurring) and issued and sold 350 shares of Series B-3 Preferred Stock (Series B-3 Preferred Stock - non-recurring at a fair value of $313,000 ) and 12,029 warrants (non-recurring Series B Preferred Stock - Warrants at closing - non-recurring at a fair value of $37,000 ) to purchase common stock. 2020 Commitment - The Company is obligated to sell to, Ares and Oaktree, and they are obligated to purchase, additional shares of Series B Preferred Stock up to approximately $15.0 million based on a failure by the Company to achieve specified debt and liquidity levels. See Note 12. Subsequent Events for further discussion of the transaction. Other financial instruments of the Company not listed in the table consist of cash and cash equivalents, accounts receivable, accounts payable and other current liabilities that approximate their fair values. Additionally, management believes that the outstanding recorded balance on the line of credit and long-term debt, approximates fair value due to their floating interest rates.

Debt

Debt	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Debt	Debt Debt consists of the following obligations as of: (in thousands) March 31, 2020 December 31, 2019 Term loan 173,345 182,687 Commercial equipment notes 3,946 4,456 Total principal due for long-term debt 177,291 187,143 Unamortized debt discount and issuance costs (20,810 ) (22,296 ) Less: Current portion of long-term debt (1,693 ) (1,946 ) Long-term debt, less current portion 154,788 162,901 Debt - Series B Preferred Stock 188,755 180,444 Unamortized debt discount and issuance costs (13,610 ) (14,303 ) Long-term Series B Preferred Stock 175,145 166,141 The weighted average interest rate for the term loan as of March 31, 2020 and December 31, 2019 , was 9.70% and 10.35% , respectively. Debt Covenants The term loan is governed by the terms of the Third A&R Credit Agreement, which include customary affirmative and negative covenants and provide for customary events of default, which include, nonpayment of principal or interest and failure to timely deliver financial statements. Under the Third A&R Credit Agreement, the financial covenant provides that the First Lien Net Leverage Ratio (as defined therein) may not exceed (i) prior to the fiscal quarter ending December 31, 2019, 4.75 :1.0, (ii) for the four fiscal quarters ending December 31, 2020, 3.50 :1.0, (iii) for the four fiscal quarters ending December 31, 2021, 2.75 :1.0, and (iv) for all subsequent quarters, 2.25 :1.0. Under the Third A&R Credit Agreement, the Company could not use an equity infusion to cure any covenant violations for fiscal quarter ending in 2019, excluding the Series B Preferred Stock. Thereafter, the Company has access to a customary equity cure. The Third A&R Credit Agreement also includes certain limitations on the payment of cash dividends on the Company's common shares and provides for other restrictions on (subject to certain exceptions) liens, indebtedness (including guarantees and other contingent obligations), investments (including loans, advances and acquisitions), mergers and other fundamental changes and sales and other dispositions of property or assets, among others. Letters of Credit and Surety Bonds In the ordinary course of business, the Company is required to post letters of credit and surety bonds to customers in support of performance under certain contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit or surety bond commits the issuer to pay specified amounts to the holder of the letter of credit or surety bond under certain conditions. If the letter of credit or surety bond issuer were required to pay any amount to a holder, the Company would be required to reimburse the issuer, which, depending upon the circumstances, could result in a charge to earnings. As of March 31, 2020 , and December 31, 2019 , the Company was contingently liable under letters of credit issued under its Third A&R Credit Agreement, in the amount of $23.7 million and $21.0 million , respectively, related to projects. In addition, as of March 31, 2020 and December 31, 2019 , the Company had outstanding surety bonds on projects of $2.5 billion and $2.4 billion , respectively. Contractual Maturities Contractual maturities of the Company's outstanding principal on debt obligations as of March 31, 2020 : (in thousands) Maturities Remainder of 2020 $ 1,365 2021 1,228 2022 15,859 2023 29,735 2024 129,104 Thereafter — Total contractual obligations $ 177,291

Commitments and contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and Contingencies In the ordinary course of business, the Company enters into agreements that provide financing for its machinery and equipment, facility and vehicle needs. The Company reviews these agreements for potential lease classification, and at inception, determines whether a lease is an operating or finance lease. Lease assets and liabilities, which generally represent the present value of future minimum lease payments over the term of the lease, are recognized as of the commencement date. Under Topic 842, leases with an initial lease term of twelve months or less are classified as short-term leases and are not recognized in the condensed consolidated balance sheets unless the lease contains a purchase option that is reasonably certain to be exercised. Lease term, discount rate, variable lease costs and future minimum lease payment determinations require the use of judgment as these are based on the facts and circumstances related to each specific lease. Lease terms are generally based on their initial non-cancelable terms, unless there is a renewal option that is reasonably certain to be exercised. Various factors, including economic incentives, intent, past history and business need are considered to determine if a renewal option is reasonably certain to be exercised. The implicit rate in a lease agreement is used when it can be determined. Otherwise, the Company's incremental borrowing rate, which is based on information available as of the lease commencement date, including applicable lease terms and the current economic environment, is used to determine the value of the lease obligation. Finance Leases The Company has obligations, exclusive of associated interest, under various finance leases for equipment totaling $61.3 million and $64.2 million at March 31, 2020 and December 31, 2019 , respectively. Gross property under this capitalized lease agreement at March 31, 2020 and December 31, 2019 , totaled $117.9 million and $116.1 million , less accumulated depreciation of $ 39.4 million and $34.0 million , respectively, for net balances of $ 78.5 million and $82.1 million , respectively. Depreciation of assets held under the finance leases are included in cost of revenue in the condensed consolidated statements of operations. The future minimum payments of finance lease obligations are as follows: (in thousands) Remainder of 2020 $ 20,035 2021 22,344 2022 18,302 2023 4,108 2024 628 Thereafter 157 Future minimum lease payments 65,574 Less: Amount representing interest 4,311 Present value of minimum lease payments 61,263 Less: Current portion of finance lease obligations 23,437 Finance lease obligations, less current portion $ 37,826 Operating Leases In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facilities, vehicles and equipment. The Company has obligations, exclusive of associated interest, totaling $44.3 million and $44.2 million at March 31, 2020 and December 31, 2019, respectively. Property under these operating lease agreements at March 31, 2020 and December 31, 2019, totaled $43.4 million and $43.4 million , respectively. The Company has long-term power-by-the-hour equipment rental agreements with a construction equipment manufacturer that have a guaranteed minimum monthly hour requirement. The minimum guaranteed amount based on the Company's current operations is $3.2 million per year. Total expense under these agreements are listed below as variable lease costs. The future minimum payments under non-cancelable operating leases are as follows: (in thousands) Remainder of 2020 $ 9,784 2021 11,242 2022 8,846 2023 6,220 2024 3,116 Thereafter 20,461 Future minimum lease payments 59,669 Less: Amount representing interest 15,347 Present value of minimum lease payments 44,322 Less: Current portion of operating lease obligations 10,191 Operating lease obligations, less current portion $ 34,131 Lease Information Three months ended March 31, 2020 March 31, 2019 Finance Lease cost: Amortization of right-of-use assets 5,697 5,008 Interest on lease liabilities 1,186 1,650 Operating lease cost 3,478 1,831 Short-term lease cost 21,635 8,496 Variable lease cost 960 191 Sublease Income (33 ) (24 ) Total lease cost $ 32,923 $ 17,152 Other information: Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from finance leases $ 1,186 $ 1,650 Operating cash flows from operating leases $ 3,342 $ 3,247 Weighted-average remaining lease term - finance leases 2.73 years 3.36 years Weighted-average remaining lease term - operating leases 8.02 years 9.94 years Weighted-average discount rate - finance leases 6.49 % 6.70 % Weighted-average discount rate - operating leases 7.14 % 6.89 %

Earnings per share

Earnings per share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings per share	Earnings Per Share The Company calculates earnings (loss) per share (“EPS”) in accordance with ASC 260, Earnings per Share . Basic EPS is computed by dividing income (loss) available to common stockholders by the weighted average number of common shares of common stock outstanding during the period. Income (loss) available to common stockholders is computed by deducting the dividends accrued for the period on cumulative preferred stock from net income. If there is a net loss, the amount of the loss is increased by those preferred dividends. Diluted EPS assumes the dilutive effect of (i) contingently issuable earn-out shares, (ii) Series A cumulative convertible preferred stock, using the if-converted method, and (iii) the assumed exercise of in-the-money stock options and warrants and the assumed vesting of outstanding restricted stock units (“RSUs”), using the treasury stock method. Whether the Company has net income, or a net loss determines whether potential issuances of common stock are included in the diluted EPS computation or whether they would be anti-dilutive. As a result, if there is a net loss, diluted EPS is computed in the same manner as basic EPS is computed. Similarly, if the Company has net income but its preferred dividend adjustment made in computing income available to common stockholders results in a net loss available to common stockholders, diluted EPS would be computed the same as basic EPS. The calculations of basic and diluted EPS, are as follows: Three Months Ended March 31, ($ in thousands, except per share data) 2020 2019 Numerator: Net loss (12,743 ) (23,639 ) Less: Convertible Preferred Stock dividends (766 ) (524 ) Net loss available to common stockholders (13,509 ) (24,163 ) Denominator: Weighted average common shares outstanding - basic and diluted 20,522,216 22,188,757 Anti-dilutive: (1)(2) Convertible Series A Preferred 6,553,041 5,045,149 Series B Preferred - Warrants at closing 7,675,325 — RSUs 1,456,359 354,106 Basic EPS (0.66 ) (1.09 ) Diluted EPS (0.66 ) (1.09 ) (1) As of March 31, 2020 and 2019, publicly traded w arrants to purchase 8,480,000 shares of common stock at $11.50 per share were not considered as dilutive as the warrants’ exercise price was greater than the average market price of the common stock during the period. (2) As of March 31, 2020 and 2019, there were 591,860 and 646,405 of vested and unvested Options and 141,248 and 169,494 unvested RSUs, respectively. These were also not considered as dilutive as the respective exercise price or average stock price required for vesting of such awards was greater than the average market price of the common stock during the period. Series A Preferred Stock As of March 31, 2020 , we had 17,483 shares of Series A Preferred Stock with a stated value of $1,000 per share plus accumulated dividends. Dividends are paid on the Series A Preferred Stock as, if and when declared by our Board. To extent permitted, dividends are required to be paid in cash quarterly in arrears on each March 31, June 30, September 30 and December 31 on the stated value at a rate of 10% per annum. If not paid in cash, dividends will accrue on the stated value and will increase the stated value on and effective as of the applicable dividend date without any further action by the Board at 12% per annum. So long as any shares of Series B Preferred Stock of the Company are currently outstanding or from and after the occurrence of any non-payment event or default event and until cured or waived, the foregoing rates will increase by 2% per annum. As of March 31, 2020 , the Company has accrued a cumulative of $2.5 million in dividends to holders of Series A Preferred Stock as a reduction to additional paid-in capital. Series B Preferred Stock As of March 31, 2020 , we had 199,474 shares of Series B Preferred Stock outstanding, with each share having a stated value of $1,000 plus accumulated dividends. Our common stock and Series A Preferred Stock are junior to the Series B Preferred Stock. Dividends are paid in cash on the Series B Preferred Stock as, if and when declared by our Board. To the extent not prohibited by applicable law, dividends are required to be declared and paid in cash quarterly in arrears on each March 31, June 30, September 30 and December 31. Any dividend period for which the Total Net Leverage Ratio is greater than 1.50 :1.00, the dividend rate is 13.5% per annum and (ii) with respect to any dividend period for which the Total Net Leverage Ratio is less than or equal to 1.50 :1.00, at a rate of 12% per annum. If not paid in cash, dividends will accrue on the stated value and will increase the stated value on Series B Preferred Stock and is effective as of the applicable dividend date without any further action by the Board at a rate of 15% . The Company has accrued a cumulative of $18.3 million in dividends to holders of Series B Preferred Stock, which is recorded in convertible debt in the Company's condensed consolidated balance sheet for the quarter ended March 31, 2020. See Note 5. Fair Value of Financial Instruments for discussion regarding the Company's valuation of Series B Preferred Stock. Stock Compensation Under guidance of ASC Topic 718 “Compensation — Stock Compensation,” stock-based compensation expense is measured at the date of grant, based on the calculated fair value of the stock-based award, and is recognized as expense over the employee’s requisite service period (generally the vesting period of the award). The fair value of the RSUs was based on the closing market price of our common stock on the date of the grant. Stock compensation expense for the RSUs is being amortized using the straight-line method over the service period. For the three months ended March 31, 2020 and 2019, we recognized $1.1 million and $1.0 million in compensation expense, respectively,

Income taxes

Income taxes	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income taxes	Income Taxes The Company’s statutory federal tax rate was 21.00% for the periods ended March 31, 2020 and 2019 , respectively. State tax rates for the same period vary among states and range from approximately 0.8% to 12.0% . A small number of states do not impose an income tax. The effective tax rates for the three months ended March 31, 2020 and 2019 were 6.4% and 27.4% , respectively. The difference between the Company’s effective tax rate and the federal statutory rate primarily results from permanent differences related to the interest accrued for the Series B Preferred Stock, which is not deductible for federal and state income taxes. There were no changes in uncertain tax positions during the periods ended March 31, 2020 and 2019 . On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) was enacted by the US Government in response to the COVID-19 pandemic to provide employment retention incentives. These relief measures did not materially affect the condensed consolidated financial statements for the first quarter of 2020. We are currently assessing the future implications of these provisions on our condensed consolidated financial statements.

Segments (Notes)

Segments (Notes)	3 Months Ended
	Mar. 31, 2020
Segments [Abstract]
Segment Reporting Disclosure [Text Block]	Segments We operate our business as two reportable segments: the Renewables segment and the Specialty Civil segment. Each of our reportable segments is comprised of similar business units that specialize in services unique to the respective markets that each segment serves. The classification of revenue and gross profit for segment reporting purposes can at times require judgment on the part of management. Our segments may perform services across industries or perform joint services for customers in multiple industries. To determine reportable segment gross profit, certain allocations, including allocations of shared and indirect costs, such as facility costs, equipment costs and indirect operating expenses, were made based on segment revenue. Separate measures of the Company’s assets, including capital expenditures and cash flows by reportable segment are not produced or utilized by management to evaluate segment performance. A substantial portion of the Company’s fixed assets are owned by and accounted for in our equipment department, including operating machinery, equipment and vehicles, as well as office equipment, buildings and leasehold improvements, and are used on an interchangeable basis across our reportable segments. As such, for reporting purposes, total under/over absorption of equipment expenses consisting primarily of depreciation is allocated to the Company's two reportable segments based on segment revenue. The following is a brief description of the Company's reportable segments: Renewables Segment The Renewables segment operates throughout the United States and specializes in a range of full engineering, procurement and construction (“ EPC ”) services that include project delivery, design, site development, construction, installation and restoration of infrastructure services for the wind and solar industries. Specialty Civil Segment The Specialty Civil segment operates throughout the United States and specializes in a range of services that include: • Heavy civil construction services such as high-altitude road and bridge construction, specialty paving, industrial maintenance and other local, state and government projects. • Environmental remediation services such as site development, environmental site closure and outsourced contract mining and coal ash management services. • Rail Infrastructure services such as planning, creation and maintenance of infrastructure projects for major railway and intermodal facilities construction. Segment Revenue Revenue by segment was as follows: Three Months Ended March 31, (in thousands) 2020 2019 Segment Revenue % of Total Revenue Revenue % of Total Revenue Renewables $ 248,746 69.5 % $ 74,031 39.0 % Specialty Civil 109,417 30.5 % 115,750 61.0 % Total revenue $ 358,163 100.0 % $ 189,781 100.0 % Segment Gross Profit Gross profit by segment was as follows: Three Months Ended March 31, (in thousands) 2020 2019 Segment Gross Profit Gross Profit Margin Gross Profit Gross Profit Margin Renewables $ 25,829 10.4 % $ 1,163 1.6 % Specialty Civil 7,212 6.6 % 4,581 4.0 % Total gross profit $ 33,041 9.2 % $ 5,744 3.0 %

Related party transactions

Related party transactions	3 Months Ended
	Mar. 31, 2020
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions Related Party Shareholders Type of Equity Holder Ownership Percentage Series A Preferred, Series A Conversion Warrants and Exchange Warrants, Series B-3 Preferred Stock (exchange agreement) Infrastructure and Energy Alternatives, LLC 100 % Series B-1 Preferred Stock, Series A Conversion Warrants, Additional 6% Warrants, Warrants at closing Ares 60 % Oaktree Power Opportunities Fund III Delaware, L.P. 40 % 2020 Commitment Ares 50 % Oaktree Power Opportunities Fund III Delaware, L.P. 50 % Series B-2 and B-3 Preferred Stock, Warrants at closing Ares 100 %

Subsequent Event (Notes)

Subsequent Event (Notes)	3 Months Ended
	Mar. 31, 2020
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event Amendment to Equity Commitment Agreement On May 6, 2020, the Company entered into an Amendment (the “Amendment”) to the Equity Commitment Agreement, dated as of October 29, 2019 (the “Equity Commitment Agreement”) by and between the Company, Ares and Oaktree. The Amendment amends the Equity Commitment Agreement to extend the period of time required to enter into the 2020 Commitment and purchase additional shares of Series B-3 Preferred Stock and warrants from the Company to July 14, 2020, or such other date as mutually agreed upon. Additionally, the Amendment clarifies that the 2020 Commitment shall in no event exceed $5,650,000 .

Business, Basis of Presentati_2

Business, Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions for Quarterly Reports on Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The unaudited condensed consolidated financial statements include the accounts of IEA and its wholly-owned direct and indirect domestic and foreign subsidiaries and in the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) that are necessary to present fairly the results of operations for the interim periods presented. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020 . These financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2019 and notes thereto included in the Company’s 2019 Annual Report on Form 10-K.
Segment Reporting, Policy [Policy Text Block]	We segregate our business into two reportable segments: the Renewables segment and the Specialty Civil segment. See Note 10. Segments for a description of the reportable segments and their operations.
Use of Estimates, Policy [Policy Text Block]	The preparation of the condensed consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and the accompanying notes. Key estimates include: the recognition of revenue and project profit or loss; fair value estimates, including those related to Series B Preferred Stock; valuations of goodwill and intangible assets; asset lives used in computing depreciation and amortization; accrued self-insured claims; other reserves and accruals; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that its estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations, actual results could differ materially from those estimates.
Revenue [Policy Text Block]	Revenue Recognition The Company adopted the requirements of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which is also referred to as Accounting Standards Codification (“ASC”) Topic 606, under the modified retrospective transition approach effective January 1, 2019, with application to all existing contracts that were not substantially completed as of January 1, 2019. The Company adopted this standard for interim periods beginning after December 31, 2019, and recorded adjustments to the previously issued quarterly financial statements for the three months ended March 31, 2019. The impacts of adoption on the Company’s retained earnings on January 1, 2019 was primarily related to variable consideration on unapproved change orders. The cumulative impact of adopting Topic 606 required net adjustments of $750,000 to the statement of operations between revenue, cost of revenue and income taxes, thereby reducing income in the March 31, 2019 quarterly financial statements and reducing the December 31, 2019 accumulated deficit. The Company also adjusted the cashflow statement as of March 31, 2019, to reflect adoption. Under Topic 606, revenue is recognized when control of promised goods and services is transferred to customers, and the amount of revenue recognized reflects the consideration to which an entity expects to be entitled in exchange for the goods and services transferred. Revenue is recognized by the Company primarily over time utilizing the cost-to-cost measure of progress for fixed price contracts and are based on cost for time and materials and other service contracts, consistent with the Company’s previous revenue recognition practices. Contracts The Company derives revenue primarily from construction projects performed under contracts for specific projects requiring the construction and installation of an entire infrastructure system or specified units within an infrastructure system. The contracts contain multiple pricing options, including fixed price, time and materials, or unit price. Renewable energy projects are performed for private customers while our Specialty Civil projects are performed for a mix of various governmental entities. Revenue derived from projects billed on a fixed-price basis totaled 96.0% and 90.2% of consolidated revenue from operations for the three months ended March 31, 2020 and 2019 , respectively. Revenue and related costs for construction contracts billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects billed on a time and materials basis totaled 4.0% and 9.8% of consolidated revenue from operations for the three months ended March 31, 2020 and 2019 , respectively. Revenue from construction contracts is recognized over time using the cost-to-cost measure of progress for fixed price construction contracts. For these contracts, the cost-to-cost measure of progress best depicts the continuous transfer of control of goods or services to the customer. The contractual terms provide that the customer compensates the Company for services rendered. Contract costs include all direct materials, labor and subcontracted costs, as well as indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment. The cost estimation and review process for recognizing revenue over time under the cost-to-cost method is based on the professional knowledge and experience of the Company’s project managers, engineers and financial professionals. Management reviews estimates of total contract transaction price and total project costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected variable consideration are factors that influence estimates of the total contract transaction price, total costs to complete those contracts and profit recognition. Changes in these factors could result in revisions to revenue and costs of revenue in the period in which the revisions are determined on a prospective basis, which could materially affect the Company’s condensed consolidated results of operations for that period. Provisions for losses on uncompleted contracts are recorded in the period in which such losses are determined. Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the unit of account under Topic 606. The transaction price of a contract is allocated to a distinct performance obligation and recognized as revenue when or as the performance obligation is satisfied. The Company’s contracts often require significant integrated services and, even when delivering multiple distinct services, are generally accounted for as a single performance obligation. Contract amendments and change orders are generally not distinct from the existing contract due to the significant integrated service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. With the exception of certain Specialty Civil service contracts, the majority of the Company’s performance obligations are completed within one year. When more than one contract is entered into with a customer on or close to the same date, the Company evaluates whether those contracts should be combined and accounted for as a single contract as well as whether those contracts should be accounted for as more than one performance obligation. This evaluation requires significant judgment and is based on the facts and circumstances of the various contracts, which could change the amount of revenue and profit recognition in a given period depending upon the outcome of the evaluation. Remaining performance obligations represent the amount of unearned transaction prices for contracts, including approved and unapproved change orders. As of March 31, 2020, the amount of the Company’s remaining performance obligations was $1,238.5 million . The Company expects to recognize approximately 81.6% of its remaining performance obligations as revenue during 2020. Revenue recognized from performance obligations satisfied in previous periods was ($2.0) million and $2.8 million , for the three months ended March 31, 2020 and 2019, respectively. Variable Consideration Transaction pricing for the Company’s contracts may include variable consideration, such as unapproved change orders, claims, incentives and liquidated damages. Management estimates variable consideration for a performance obligation utilizing estimation methods that best predict the amount of consideration to which the Company will be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Management’s estimates of variable consideration and determination of whether to include estimated amounts in transaction price are based on legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer and all other relevant information that is reasonably available. The effect of a change in variable consideration on the transaction price of a performance obligation is typically recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders, claims and liquidated damages reflected in transaction price are not resolved in the Company’s favor, or to the extent incentives reflected in transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue. As of March 31, 2020 and year ended December 31, 2019 , the Company included approximately $60.2 million and $73.3 million , respectively, of unapproved change orders and/or claims in the transaction price for certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These transaction price adjustments are included within Contract Assets or Contract Liabilities as appropriate. The Company actively engages with its customers to complete the final change order approval process, and generally expects these processes to be completed within one year. Amounts ultimately realized upon final acceptance by customers could be higher or lower than such estimated amounts. Disaggregation of Revenue The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue: (in thousands) Three months ended March 31, 2020 March 31, 2019 Renewables Wind $ 248,537 $ 72,034 Solar 209 1,997 $ 248,746 $ 74,031 Specialty Civil Heavy civil $ 41,222 $ 50,115 Rail 47,057 42,609 Environmental 21,138 23,026 $ 109,417 $ 115,750
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards - Guidance Adopted in 2020 In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820), Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which eliminates certain disclosure requirements for recurring and non-recurring fair value measurements, such as the amount of and reason for transfers between Level 1 and Level 2 of the fair value hierarchy, and adds new disclosure requirements for Level 3 measurements. ASU 2018-13 is effective for all entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. Certain disclosures per ASU 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. We adopted the standard on January 1, 2020, and it did not have an impact on our disclosures for fair value measurements. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842) , ” which is effective for annual reporting periods beginning after December 15, 2018. Under Topic 842, lessees will be required to recognize the following for all leases (with the exception of short-term leases) at the commencement date: i) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis, and ii) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Topic 842 requires entities to adopt the new lease standard using a modified retrospective method and initially apply the related guidance at the beginning of the earliest period presented in the financial statements. The Company adopted Topic 842 using the modified retrospective method as of January 1, 2019 and for interim periods beginning after December 31, 2019, without adjusting comparative periods in the financial statements. The most significant effect of the new guidance was the recognition of operating lease right-of-use assets and a liability for operating leases as of December 31, 2019. The accounting for finance leases (capital leases) was substantially unchanged. The Company elected to utilize the package of practical expedients that allowed entities to: (1) not reassess whether any expired or existing contracts were or contained leases; (2) retain the existing classification of lease contracts as of the date of adoption; (3) not reassess initial direct costs for any existing leases; and (4) not separate non-lease components for all classes of leased assets. Recently Issued Accounting Standards Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which introduced an expected credit loss methodology for the measurement and recognition of credit losses on most financial assets, including trade accounts receivables. The expected credit loss methodology under ASU 2016-13 is based on historical experience, current conditions and reasonable and supportable forecasts, and replaces the probable/incurred loss model for measuring and recognizing expected losses under current GAAP. The ASU also requires disclosure of information regarding how a company developed its allowance, including changes in the factors that influenced management’s estimate of expected credit losses and the reasons for those changes. The ASU and its related clarifying updates are effective for smaller reporting companies for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years, with early adoption permitted. We are still evaluating the new standard but do not expect it to have a material impact on our estimate of the allowance for uncollectable accounts. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. This ASU is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Depending on the amendment, adoption may be applied on the retrospective, modified retrospective, or prospective basis. We are currently evaluating the potential effects of adopting the provisions of ASU No. 2019-12. Management has evaluated other recently issued accounting pronouncements and does not believe that they will have a significant impact on the financial statements and related disclosures.

Business, Basis of Presentati_3

Business, Basis of Presentation and Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts how the nature, amount, timing and uncertainty of its revenue: (in thousands) Three months ended March 31, 2020 March 31, 2019 Renewables Wind $ 248,537 $ 72,034 Solar 209 1,997 $ 248,746 $ 74,031 Specialty Civil Heavy civil $ 41,222 $ 50,115 Rail 47,057 42,609 Environmental 21,138 23,026 $ 109,417 $ 115,750
Schedule of revenue and accounts receivable concentrations, net of allowances	The Company had the following approximate revenue and accounts receivable concentrations, net of allowances, for the periods ended: Revenue % Three months ended Accounts Receivable % 2020 2019 March 31, 2020 December 31, 2019 Company A (Specialty Civil Segment) * 21.1 % * * Company B (Renewable Segment) * 11.9 % * * Company C (Renewables Segment) 11.5 % * * * Company D (Renewables Segment) 11.1 % * * * * Amount was not above 10% threshold

Contract Assets and Liabiliti_2

Contract Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2020
Contractors [Abstract]
Contract Assets and Contract Liabilities	(in thousands) March 31, 2020 December 31, 2019 Costs and estimated earnings in excess of billings on uncompleted contracts $ 106,285 $ 91,543 Retainage receivable 87,566 87,760 193,851 179,303 Contract liabilities consist of the following: (in thousands) March 31, 2020 December 31, 2019 Billings in excess of costs and estimated earnings on uncompleted contracts $ 107,207 $ 115,570 Loss on contracts in progress 46 64 $ 107,253 $ 115,634
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Activity in the allowance for doubtful accounts for the periods indicated is as follows: Three Months Ended March 31, (in thousands) 2020 2019 Allowance for doubtful accounts at beginning of period $ 75 $ 42 Plus: provision for (reduction in) allowance 14 30 Less: write-offs, net of recoveries — — Allowance for doubtful accounts at period end $ 89 $ 72

Property, plant and equipment_2

Property, plant and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of property plant and equipment	Property, plant and equipment consisted of the following: (in thousands) March 31, 2020 December 31, 2019 Buildings and leasehold improvements $ 3,051 $ 2,919 Land 17,600 17,600 Construction equipment 175,707 173,434 Office equipment, furniture and fixtures 3,537 3,487 Vehicles 5,375 6,087 205,270 203,527 Accumulated depreciation (70,517 ) (63,039 ) Property, plant and equipment, net $ 134,753 $ 140,488

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, net (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	The following table provides the changes in the carrying amount of goodwill: (in thousands) Renewables Specialty Civil Total January 1, 2019 $ 3,020 $ 37,237 $ 40,257 Acquisition adjustments — (2,884 ) (2,884 ) December 31, 2019 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — March 31, 2020 $ 3,020 $ 34,353 $ 37,373
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Intangible assets consisted of the following as of the dates indicated: March 31, 2020 December 31, 2019 ($ in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Customer relationships $ 26,500 $ (5,642 ) $ 20,858 5.75 years $ 26,500 $ (4,695 ) $ 21,805 6 years Trade name 13,400 (3,990 ) 9,410 3.75 years 13,400 (3,305 ) 10,095 4 years Backlog 13,900 (10,266 ) 3,634 9 months 13,900 (8,528 ) 5,372 1 year $ 53,800 $ (19,898 ) $ 33,902 $ 53,800 $ (16,528 ) $ 37,272
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following table provides the annual intangible amortization expense currently expected to be recognized for the years 2020 through 2024: (in thousands) Remainder of 2020 2021 2022 2023 2024 Amortization expense $ 11,837 $ 6,466 $ 6,466 $ 5,841 $ 3,785

Fair value of financial instr_2

Fair value of financial instruments (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of fair value of liabilities measured on recurring basis	The following table sets forth information regarding the Company's assets measured at fair value on a recurring basis: March 31, 2020 December 31, 2019 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Liabilities Series B Preferred Stock - Series A Conversion Warrants and Exchange Warrants $ — $ — $ 1,800 $ 1,800 $ — $ — $ 4,317 $ 4,317 Series B-1 Preferred Stock - Additional 6% Warrants — — 400 400 — — 400 400 Series B-3 Preferred - Closing Warrants — — — — — — 11,491 11,491 Rights Offering — — — — — — 1,383 1,383 Total liabilities $ — $ — $ 2,200 $ 2,200 $ — $ — $ 17,591 $ 17,591
Schedule of reconciliation of fair value unobservable liabilities measured on recurring basis	The following is a reconciliation of the beginning and ending balances of recurring fair value measurements using Level 3 inputs: (in thousands) Series B Preferred - Series A Conversion Warrants and Exchange Warrants Series B-1 Preferred Stock - Additional 6% Warrants Series B-3 Preferred - Closing Warrants Rights Offering Beginning Balance, December 31, 2019 $ 4,317 $ 400 $ 11,491 $ 1,383 Fair value adjustment - (gain) loss recognized in other income (91 ) — 1,677 (1,383 ) Transfer to non-recurring fair value instrument (equity) (2,426 ) — (13,168 ) — Ending Balance, March 31, 2020 $ 1,800 $ 400 $ — $ —

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Schedule of debt	Debt consists of the following obligations as of: (in thousands) March 31, 2020 December 31, 2019 Term loan 173,345 182,687 Commercial equipment notes 3,946 4,456 Total principal due for long-term debt 177,291 187,143 Unamortized debt discount and issuance costs (20,810 ) (22,296 ) Less: Current portion of long-term debt (1,693 ) (1,946 ) Long-term debt, less current portion 154,788 162,901 Debt - Series B Preferred Stock 188,755 180,444 Unamortized debt discount and issuance costs (13,610 ) (14,303 ) Long-term Series B Preferred Stock 175,145 166,141
Contractual maturities of debt and capital lease obligations	Contractual Maturities Contractual maturities of the Company's outstanding principal on debt obligations as of March 31, 2020 : (in thousands) Maturities Remainder of 2020 $ 1,365 2021 1,228 2022 15,859 2023 29,735 2024 129,104 Thereafter — Total contractual obligations $ 177,291

Commitments and contingencies (

Commitments and contingencies (Tables)	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	The future minimum payments of finance lease obligations are as follows: (in thousands) Remainder of 2020 $ 20,035 2021 22,344 2022 18,302 2023 4,108 2024 628 Thereafter 157 Future minimum lease payments 65,574 Less: Amount representing interest 4,311 Present value of minimum lease payments 61,263 Less: Current portion of finance lease obligations 23,437 Finance lease obligations, less current portion $ 37,826
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The future minimum payments under non-cancelable operating leases are as follows: (in thousands) Remainder of 2020 $ 9,784 2021 11,242 2022 8,846 2023 6,220 2024 3,116 Thereafter 20,461 Future minimum lease payments 59,669 Less: Amount representing interest 15,347 Present value of minimum lease payments 44,322 Less: Current portion of operating lease obligations 10,191 Operating lease obligations, less current portion $ 34,131
Schedule of Additional Lease Information [Table Text Block]	Lease Information Three months ended March 31, 2020 March 31, 2019 Finance Lease cost: Amortization of right-of-use assets 5,697 5,008 Interest on lease liabilities 1,186 1,650 Operating lease cost 3,478 1,831 Short-term lease cost 21,635 8,496 Variable lease cost 960 191 Sublease Income (33 ) (24 ) Total lease cost $ 32,923 $ 17,152 Other information: Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from finance leases $ 1,186 $ 1,650 Operating cash flows from operating leases $ 3,342 $ 3,247 Weighted-average remaining lease term - finance leases 2.73 years 3.36 years Weighted-average remaining lease term - operating leases 8.02 years 9.94 years Weighted-average discount rate - finance leases 6.49 % 6.70 % Weighted-average discount rate - operating leases 7.14 % 6.89 %

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Schedule of basic and diluted EPS	The calculations of basic and diluted EPS, are as follows: Three Months Ended March 31, ($ in thousands, except per share data) 2020 2019 Numerator: Net loss (12,743 ) (23,639 ) Less: Convertible Preferred Stock dividends (766 ) (524 ) Net loss available to common stockholders (13,509 ) (24,163 ) Denominator: Weighted average common shares outstanding - basic and diluted 20,522,216 22,188,757 Anti-dilutive: (1)(2) Convertible Series A Preferred 6,553,041 5,045,149 Series B Preferred - Warrants at closing 7,675,325 — RSUs 1,456,359 354,106 Basic EPS (0.66 ) (1.09 ) Diluted EPS (0.66 ) (1.09 ) (1) As of March 31, 2020 and 2019, publicly traded w arrants to purchase 8,480,000 shares of common stock at $11.50 per share were not considered as dilutive as the warrants’ exercise price was greater than the average market price of the common stock during the period. (2) As of March 31, 2020 and 2019, there were 591,860 and 646,405 of vested and unvested Options and 141,248 and 169,494 unvested RSUs, respectively. These were also not considered as dilutive as the respective exercise price or average stock price required for vesting of such awards was greater than the average market price of the common stock during the period.

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2020
Segments [Abstract]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]	Segment Revenue Revenue by segment was as follows: Three Months Ended March 31, (in thousands) 2020 2019 Segment Revenue % of Total Revenue Revenue % of Total Revenue Renewables $ 248,746 69.5 % $ 74,031 39.0 % Specialty Civil 109,417 30.5 % 115,750 61.0 % Total revenue $ 358,163 100.0 % $ 189,781 100.0 %
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]	Segment Gross Profit Gross profit by segment was as follows: Three Months Ended March 31, (in thousands) 2020 2019 Segment Gross Profit Gross Profit Margin Gross Profit Gross Profit Margin Renewables $ 25,829 10.4 % $ 1,163 1.6 % Specialty Civil 7,212 6.6 % 4,581 4.0 % Total gross profit $ 33,041 9.2 % $ 5,744 3.0 %

Related party transactions (Tab

Related party transactions (Tables)	3 Months Ended
	Mar. 31, 2020
Related Party Transactions [Abstract]
Schedule of related party shareholders	Related Party Shareholders Type of Equity Holder Ownership Percentage Series A Preferred, Series A Conversion Warrants and Exchange Warrants, Series B-3 Preferred Stock (exchange agreement) Infrastructure and Energy Alternatives, LLC 100 % Series B-1 Preferred Stock, Series A Conversion Warrants, Additional 6% Warrants, Warrants at closing Ares 60 % Oaktree Power Opportunities Fund III Delaware, L.P. 40 % 2020 Commitment Ares 50 % Oaktree Power Opportunities Fund III Delaware, L.P. 50 % Series B-2 and B-3 Preferred Stock, Warrants at closing Ares 100 %

Business, Basis of Presentati_4

Business, Basis of Presentation and Significant Accounting Policies (Details) - Product Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fixed-price Contract [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	96.00%	90.20%
Time-and-materials Contract [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	4.00%	9.80%

Business, Basis of Presentati_5

Business, Basis of Presentation and Significant Accounting Policies Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments	2
Revenue	$ 358,163	$ 189,781
Wind Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	248,537	72,034
Solar Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	209	1,997
Heavy Civil Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	41,222	50,115
Rail Construction Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	47,057	42,609
Environmental Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	21,138	23,026
Renewables Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	248,746	74,031
Specialty Civil Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 109,417	$ 115,750

Business, Basis of Presentati_6

Business, Basis of Presentation and Significant Accounting Policies Schedule of concentrations for revenue and accounts receivable (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Concentration Company A [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		21.10%
Concentration Company B [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		11.90%
Concentration Company C [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.50%
Concentration Company D [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.10%

Business, Basis of Presentati_7

Business, Basis of Presentation and Significant Accounting Policies Revenue 606 (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue 606 [Abstract]
Effect of Change in Accounting Principle Topic 606		$ 750,000
Revenue, Remaining Performance Obligation, Amount	$ 1,238,500,000
Revenue, Remaining Performance Obligation, Percentage	81.60%
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ (2,000,000)	$ 2,800,000
Deferred Revenue, Revenue Recognized	$ 60,200,000		$ 73,300,000

Contract Assets and Liabiliti_3

Contract Assets and Liabilities Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Contractors [Abstract]
Unbilled Contracts Receivable	$ 106,285		$ 91,543
Contract Receivable Retainage	87,566		87,760
Contract Assets	193,851		179,303
Deferred Revenue	107,207		115,570
Provision for Loss on Contracts	46		64
Contract Liabilities	107,253		$ 115,634
Contract with Customer, Liability, Revenue Recognized	$ 90,900	$ 31,900

Contract Assets and Liabiliti_4

Contract Assets and Liabilities Activity in allowance for doubtful accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss, Beginning of Period	$ 75	$ 42
Accounts Receivable, Allowance for Credit Loss, Writeoff	14	30
Accounts Receivable, Credit Loss Expense (Reversal)	0	0
Accounts Receivable, Allowance for Credit Loss, End of Period	89	$ 72
One Customer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contracts Receivable, Claims and Uncertain Amounts	$ 9,200		$ 9,200

Property, plant and equipment_3

Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 205,270		$ 203,527
Accumulated depreciation	(70,517)		(63,039)
Property, plant and equipment, net	134,753		140,488
Depreciation expense	8,516	$ 8,476
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,051		2,919
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,600		17,600
Construction equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	175,707		173,434
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,537		3,487
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,375		$ 6,087

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 37,373	$ 40,257
Goodwill, Period Increase (Decrease)	0	(2,884)
Goodwill, Ending Balance	37,373	37,373
Renewables Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	3,020	3,020
Goodwill, Period Increase (Decrease)	0	0
Goodwill, Ending Balance	3,020	3,020
Specialty Civil Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	34,353	37,237
Goodwill, Period Increase (Decrease)	0	(2,884)
Goodwill, Ending Balance	$ 34,353	$ 34,353

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, net Schedule of intangible assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 53,800,000		$ 53,800,000
Accumulated Amortization	(19,898,000)		(16,528,000)
Net Book Value	33,902,000		37,272,000
Amortization of Intangible Assets	3,370,000	$ 3,500,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,500,000		26,500,000
Accumulated Amortization	(5,642,000)		(4,695,000)
Net Book Value	$ 20,858,000		$ 21,805,000
Weighted Average Useful Life	5 years 9 months		6 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,400,000		$ 13,400,000
Accumulated Amortization	(3,990,000)		(3,305,000)
Net Book Value	$ 9,410,000		$ 10,095,000
Weighted Average Useful Life	3 years 9 months		4 years
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,900,000		$ 13,900,000
Accumulated Amortization	(10,266,000)		(8,528,000)
Net Book Value	$ 3,634,000		$ 5,372,000
Weighted Average Useful Life	9 months		1 year

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, net Schedule of annual expected amortization expense (Details) $ in Thousands	Mar. 31, 2020USD ($)
Finite-Lived Intangible Assets [Line Items]
Remainder of 2020	$ 11,837
2021	6,466
2022	6,466
2023	5,841
2024	$ 3,785

Fair value of financial instr_3

Fair value of financial instruments - Fair Value Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	$ 2,200	$ 17,591
Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	1,800	4,317
Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	400	400
Series B Preferred Stock Warrants at closing[Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	11,491
Rights Offering Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	1,383
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B Preferred Stock Warrants at closing[Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rights Offering Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Series B Preferred Stock Warrants at closing[Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Rights Offering Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	2,200	17,591
Significant Unobservable Inputs (Level 3) | Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	1,800	4,317
Significant Unobservable Inputs (Level 3) | Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	400	400
Significant Unobservable Inputs (Level 3) | Series B Preferred Stock Warrants at closing[Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	0	11,491
Significant Unobservable Inputs (Level 3) | Rights Offering Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Obligations, Fair Value Disclosure	$ 0	$ 1,383

Fair value of financial instr_4

Fair value of financial instruments - Reconciliation of Level 3 Inputs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, December 31, 2019	$ 4,317
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	91
Transfer to non-recurring fair value instrument (equity)	(2,426)
Ending Balance, March 31, 2020	1,800
Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, December 31, 2019	400
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Transfer to non-recurring fair value instrument (equity)	0
Ending Balance, March 31, 2020	400
Series B-3 Preferred Stock Closing Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, December 31, 2019	11,491
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	1,677
Transfer to non-recurring fair value instrument (equity)	(13,168)
Ending Balance, March 31, 2020	0
Rights Offering Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, December 31, 2019	1,383
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(1,383)
Transfer to non-recurring fair value instrument (equity)	0
Ending Balance, March 31, 2020	$ 0

Fair value of financial instr_5

Fair value of financial instruments - Fair Value (Details) - USD ($)	Mar. 31, 2020	Mar. 04, 2020	Jan. 21, 2020	Dec. 31, 2019	Nov. 14, 2019	Oct. 29, 2019	Aug. 30, 2019	May 20, 2019
Series B Preferred Stock Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Series B Preferred Stock FV	$ 153,700,000
Series B Preferred Stock		350
Series B Preferred Stock Warrants at closing[Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Series B Preferred Stock Warrant Exercise Price								$ 0.0001
10% Warrants at fully diluted share count								0.1
Exercise price of securities excluded at closing (in dollars per share)								$ 11.50
Warrants Issued at Closing of Equity Agreement		12,029			3,568,750		900,000	2,545,934
Share price (in dollars per share)			$ 3.69	$ 3.22	$ 2.20		$ 3.75	$ 4.21
Series B-3 Exchange Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants Issued at Closing of Equity Agreement						657,383
Share price (in dollars per share)			$ 3.69	$ 3.22		$ 2.20
Series A Exchange Percentage for Series B-3						50.00%
Series B Preferred - Series A Conversion Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Series B Preferred Stock Warrant Exercise Price								0.0001
Share price (in dollars per share)								$ 4.21
Series B-1 Preferred Stock 6% Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
6% warrants								0.06
Rights Offering Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Series B Preferred Stock FV		$ 313,000
Preferred Stock Warrants at Closing FV Nonrecurring		$ 37,000
2020 Commitment [Member] [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds Received for series b preferred	$ 15,000,000

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total principal due for long-term debt	$ 177,291	$ 187,143
Debt Issuance Costs, Net	(20,810)	(22,296)
Long-term Debt, Current Maturities	(1,693)	(1,946)
Long-term debt, less current portion	154,788	162,901
Debt - Series B Preferred Stock	175,145	166,141
Term Loan [Member]
Debt Instrument [Line Items]
Total principal due for long-term debt	173,345	182,687
Series B Preferred Stock Liability [Member]
Debt Instrument [Line Items]
Total principal due for long-term debt	188,755	180,444
Debt Issuance Costs, Net	(13,610)	(14,303)
Commercial equipment notes
Debt Instrument [Line Items]
Total principal due for long-term debt	$ 3,946	$ 4,456

Debt - Narrative (Details)

Debt - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Letters of credit contingently liable for	$ 23,652	$ 21,000
Surety bonds	$ 2,461,519	$ 2,393,157
Debt Covenant Period, Period One [Member] | Third A&R Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio	4.75
Debt Covenant Period, Period Two [Member] | Third A&R Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio	3.50
Debt Covenant Period, Period Three [Member] [Member] | Third A&R Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio	2.75
Debt Covenant Period, Period Four [Member] [Member] | Third A&R Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio	2.25
Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	9.70%	10.35%

Debt - Long Term Debt Obligatio

Debt - Long Term Debt Obligations (Details) $ in Thousands	Mar. 31, 2020USD ($)
Debt Disclosure [Abstract]
Remainder of 2020	$ 1,365
2021	1,228
2022	15,859
2023	29,735
2024	129,104
Thereafter	0
Contractual Obligation	$ 177,291

Commitments and contingencies -

Commitments and contingencies - Lease Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Finance Lease, Liability	$ 61,263	$ 64,200
Finance leased assets, gross	117,900	116,100
Finance leased assets, accumulated depreciation	(39,400)	(34,000)
Finance leased assets, net	78,500	82,100
Operating Lease, Liability	44,322	44,200
Operating Lease, Right-of-Use Asset	43,444	$ 43,431
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	$ 3,200

Commitments and contingencies F

Commitments and contingencies Future minimum payments of finance leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosures [Abstract]
Remainder of 2020	$ 20,035
2021	22,344
2022	18,302
2023	4,108
2024	628
Thereafter	157
Finance minimum lease payments	65,574
Less: Amount representing interest	4,311
Present Value of Minimum Lease Payments	61,263	$ 64,200
Less: Current portion of finance lease obligations	23,437
Finance lease obligations, less current portion	$ 37,826

Commitments and contingencies_2

Commitments and contingencies Future mimum payments of operating leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosures [Abstract]
Remainder of 2020	$ 9,784
2021	11,242
2022	8,846
2023	6,220
2024	3,116
Thereafter	20,461
Lessee, Operating Lease, Liability, Payments, Due	59,669
Operating Leases, Future Minimum Payments, Interest Included in Payments	15,347
Operating Lease, Liability	44,322	$ 44,200
Operating Lease, Liability, Current	10,191	9,628
Operating Lease, Liability, Noncurrent	$ 34,131	$ 34,572

Commitments and contingencies S

Commitments and contingencies Schedule of Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Additional Lease Information [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 5,697	$ 5,008
Finance Lease, Interest Expense	1,186	1,650
Operating Leases, Rent Expense, Net	3,478	1,831
Short-term Lease, Cost	21,635	8,496
Variable Lease, Cost	960	191
Sublease Income	(33)	(24)
Lease, Cost	32,923	17,152
Operating Cashflow Finance Leases	1,186	1,650
Operating cashflow from operating leases	$ 3,342	$ 3,247
Finance Lease, Weighted Average Remaining Lease Term	2 years 8 months 23 days	3 years 4 months 10 days
Operating Lease, Weighted Average Remaining Lease Term	8 years 7 days	9 years 11 months 7 days
Finance Lease, Weighted Average Discount Rate, Percent	6.49%	6.70%
Operating Lease, Weighted Average Discount Rate, Percent	7.14%	6.89%

Earnings per share - Basic and

Earnings per share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (12,743)	$ (23,639)
Less: Convertible Preferred Stock dividends	(766)	(524)
Net loss available to common stockholders	$ (13,509)	$ (24,163)
Denominator:
Weighted Average Number of Shares Outstanding, Basic	20,522,216	22,188,757
Basic EPS (in dollars per share)	$ (0.66)	$ (1.09)
Diluted EPS (in dollars per share)	$ (0.66)	$ (1.09)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock	6,553,041	5,045,149
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	7,675,325	0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,456,359	354,106
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	8,480,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 11.50
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	591,860	646,405
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	141,248	169,494

Earnings per share - Narrative

Earnings per share - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	17,483		17,483
Preferred stock, par value (in dollars per share)	$ 0.0001		$ 0.0001
Share-based compensation expense	$ 1,113	$ 1,040
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	17,483
Preferred stock, par value (in dollars per share)	$ 1,000
Preferred stock, dividend rate thereafter	10.00%
Series A Preferred PIK Dividend Rate 18 mos	12.00%
Default Rate for Uncured Dividends	2.00%
Dividends Payable	$ 2,524
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 1,000
SeriesB Preferred Shares to be Issued in Equity Agreement	199,474
Ratio Net Leverage Ratio for Deleveraging Event	1.50
Series B Cash Dividend Rate after Deleveraging	13.50%
Dividend Rate after 1.5:1.0 leverage	12.00%
Preferred Stock Paid In Kind Dividend Rate	15.00%
Dividends Payable	$ 18,300

Income taxes (Details)

Income taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Contingency [Line Items]
Statutory federal tax rate	21.00%
Effective tax rates	6.40%	27.40%
Increase (decrease) in uncertain tax positions	$ 0	$ 0
Minimum
Income Tax Contingency [Line Items]
State tax rate	0.80%
Maximum
Income Tax Contingency [Line Items]
State tax rate	12.00%

Segments (Details)

Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 358,163	$ 189,781
Segment revenue as a percentage of total revenue	100.00%	100.00%
Gross Profit	$ 33,041	$ 5,744
Gross Profit Margin	9.20%	3.00%
Renewables Segment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 248,746	$ 74,031
Segment revenue as a percentage of total revenue	69.50%	39.00%
Gross Profit	$ 25,829	$ 1,163
Gross Profit Margin	10.40%	1.60%
Specialty Civil Segment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 109,417	$ 115,750
Segment revenue as a percentage of total revenue	30.50%	61.00%
Gross Profit	$ 7,212	$ 4,581
Gross Profit Margin	6.60%	4.00%

Related party transactions (Det

Related party transactions (Details)	Mar. 31, 2020
Infrastructure And Energy Alternatives, LLC [Member]
Related Party Transaction [Line Items]
IEA LLC Ownership Percentage of Preferred	100.00%
Ares [Member]
Related Party Transaction [Line Items]
Series B Preferred Equity Agreement - All Equity Ares	50.00%
Oaktree [Member]
Related Party Transaction [Line Items]
Series B Preferred Equity Agreement - All Equity Oaktree	50.00%
Series B Preferred Stock [Member] | Ares [Member]
Related Party Transaction [Line Items]
Series B Preferred Equity Agreement - All Equity Ares	60.00%
Series B Preferred Stock [Member] | Oaktree [Member]
Related Party Transaction [Line Items]
Series B Preferred Equity Agreement - All Equity Oaktree	40.00%
Series B-2 Preferred Stock [Member] | Ares [Member]
Related Party Transaction [Line Items]
Series B Preferred Equity Agreement - All Equity Ares	100.00%

Subsequent Event (Details)

Subsequent Event (Details) $ in Thousands	May 06, 2020USD ($)
Subsequent Event
Subsequent Event [Line Items]
Other Commitment	$ 5,650