Basis of Presentation	6 Months Ended
Jun. 30, 2017
Basis of Presentation
Basis of Presentation	Note 2—Basis of Presentation Interim consolidated financial statements — The interim condensed consolidated financial statements for the three and six month periods ended June 30, 2017 and 2016 have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). As such, certain disclosures, which would substantially duplicate the disclosures contained in the Company’s Annual Report on Form 10-K, filed on February 28, 2017, which contains the Company’s audited consolidated financial statements for the year ended December 31, 2016, have been omitted. This Second Quarter 2017 Report should be read in concert with the Company’s most recent Annual Report on Form 10-K. The interim financial information is unaudited. In the opinion of management, the interim information includes all adjustments (consisting of normal recurring adjustments) necessary for the fair presentation of the interim financial information. Revenue recognition Fixed-price contracts — Historically, a substantial portion of the Company’s revenue has been generated under fixed-price contracts. For fixed-price contracts, the Company recognizes revenues primarily using the percentage-of-completion method, which may result in uneven and irregular results. In the percentage-of-completion method, estimated contract values, estimated cost at completion and total costs incurred to date are used to calculate revenues earned. Unforeseen events and circumstances can alter the estimate of the costs and potential profit associated with a particular contract. Total estimated costs, and thus contract revenues and income, can be impacted by changes in productivity, scheduling, the unit cost of labor, subcontracts, materials and equipment. Additionally, external factors such as weather, client needs, client delays in providing permits and approvals, labor availability, governmental regulation and politics may affect the progress of a project’s completion and thus the timing of revenue recognition. To the extent that original cost estimates are modified, estimated costs to complete increase, delivery schedules are delayed, or progress under a contract is otherwise impeded, cash flow, revenue recognition and profitability from a particular contract may be adversely affected. Other contract forms — The Company also uses unit price, time and material, and cost reimbursable plus fee contracts. For these jobs, revenue is recognized primarily based on contractual terms. Generally, time and material and cost reimbursement contract revenues are recognized on an input basis, based on labor hours incurred and on purchases made. Unit price contracts generally recognize revenue on an output based measurement such as the completion of specific units at a specified unit price. The Company considers unapproved change orders to be contract variations for which customers have not agreed to both scope and price. Costs associated with unapproved change orders are included in the estimated cost to complete and are treated as project costs as incurred. The Company will recognize revenue if it is probable that the contract price will be adjusted and can be reliably estimated. Unapproved change orders involve the use of estimates, and it is reasonably possible that revisions to the estimated costs and recoverable amounts may be required in future reporting periods to reflect changes in estimates or final agreements with customers. The Company considers claims to be amounts it seeks, or will seek, to collect from customers or others for customer-caused changes in contract specifications or design, or other customer-related causes of unanticipated additional contract costs on which there is no agreement with customers. Claims can also be caused by non-customer-caused changes, such as weather delays or rain. Costs associated with claims are included in the estimated costs to complete the contracts and are treated as project costs when incurred. Claims are included in revenue to the extent the related costs have been incurred, realization is probable, and amounts can be reliably estimated. Revenue in excess of contract costs from claims is recognized when an agreement is reached with customers as to the value of the claims, which in some instances may not occur until after completion of work under the contract. At any time, if an estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full at that time and recognized as an “accrued loss provision” which is included in the accrued expenses and other current liabilities amount on the balance sheet. For fixed price contracts, as the percentage-of-completion method is used to calculate revenues, the accrued loss provision is changed so that the gross profit for the contract remains zero in future periods. If we anticipate that there will be a loss for unit price or cost reimbursable contracts, the projected loss is recognized in full at that time. Changes in job performance, job conditions and estimated profitability, including those arising from final contract settlements, may result in revisions to costs and income. These revisions are recognized in the period in which the revisions are identified. In all forms of contracts, the Company estimates its collectability of contract amounts at the same time that it estimates project costs. If the Company anticipates that there may be issues associated with the collectability of the full amount calculated as revenues, the Company may reduce the amount recognized as revenue to reflect the uncertainty associated with realization of the eventual cash collection. For example, when a cost reimbursable project exceeds the client’s expected budget amount, the client frequently requests an adjustment to the final amount. Similarly, some utility clients reserve the right to audit costs for significant periods after performance of the work. In these situations, the Company may choose to defer recognition of revenue until the client pays for the services. The caption “Costs and estimated earnings in excess of billings” in the Consolidated Balance Sheets represents unbilled receivables which arise when revenues have been recorded but the amount will not be billed until a later date. Balances represent: (a) unbilled amounts arising from the use of the percentage-of-completion method of accounting which may not be billed under the terms of the contract until a later date or project milestone; (b) incurred costs to be billed under cost reimbursement type contracts; (c) amounts arising from routine lags in billing; or (d) the revenue associated with unapproved change orders or claims when realization is probable and amounts can be reliably determined. For those contracts in which billings exceed contract revenues recognized to date, the excess amounts are included in the caption “Billings in excess of costs and estimated earnings”. In accordance with applicable terms of certain construction contracts, retainage amounts may be withheld by customers until completion and acceptance of the project. Some payments of the retainage may not be received for a significant period after completion of our portion of a project. In some jurisdictions, retainage amounts are deposited into an escrow account. Significant revisions in contract estimates — Revenue recognition is based on the percentage-of-completion method for firm fixed-price contracts. Under this method, the costs incurred to date as a percentage of total estimated costs are used to calculate revenue. Total estimated costs, and thus contract revenues and margin, are impacted by many factors, which can cause significant changes in estimates during the life cycle of a project. For projects that were in process at the end of the prior year or a prior quarter, there can be a difference in revenues and profits that would have been recognized in the prior year or prior quarter had current estimates of costs to complete been used at the end of the prior year or prior quarter. Customer concentration — The Company operates in multiple industry segments encompassing the engineering and construction of commercial, industrial and public works infrastructure assets throughout primarily the United States. Typically, the top ten customers in any one calendar year generate revenues in excess of 50% of total revenues; however, the group that comprises the top ten customers varies from year to year. During the three and six months ended June 30, 2017, revenues generated by the top ten customers were approximately $330.2 million and $713.5 million, respectively, which represented 52.3% and 59.8%, respectively, of total revenues during the period. During the periods, two large pipeline projects represented 11.0% and 19.2% of total revenues, respectively and Texas Department of Transportation (“TXDOT”) represented 10.6% and 10.5% of total revenues, respectively. During the three and six months ended June 30, 2016, revenues generated by the top ten customers were $263.0 million and $533.0 million, respectively, which represented 57.7% and 60.1%, respectively, of total revenues during the period. During the periods, a Louisiana petrochemical project represented 11.3% and 12.4% of total revenues, respectively and TXDOT represented 10.2% and 11.8% of total revenues, respectively. At June 30, 2017, approximately 11.7% of the Company’s accounts receivable were due from one customer, and that customer provided 8.8% of the Company’s revenues for the six months ended June 30, 2017. In addition, of total accounts receivable, approximately 11.0% are from one customer with whom the Company is currently in dispute resolution. See Note 17 – “Commitments and Contingencies”. At June 30, 2016, approximately 15.6% of the Company’s accounts receivable were due from one customer, and that customer provided 12.4% of the Company’s revenues for the six months ended June 30, 2016. In addition, approximately 16.0% of total accounts receivable at June 30, 2016 were in dispute resolution. Multiemployer plans — Various subsidiaries are signatories to collective bargaining agreements. These agreements require that the Company participate in and contribute to a number of multiemployer benefit plans for its union employees at rates determined by the agreements. The trustees for each multiemployer plan determine the eligibility and allocations of contributions and benefit amounts, determine the types of benefits, and administer the plan. Federal law requires that if the Company were to withdraw from an agreement, it would incur a withdrawal obligation. The potential withdrawal obligation may be significant. In accordance with Generally Accepted Accounting Principles (“GAAP”), any withdrawal liability would be recorded when it is probable that a liability exists and can be reasonably estimated. Inventory and uninstalled contract materials — Inventory consists of expendable construction materials and small tools that will be used in construction projects and is valued at the lower of cost, using first-in, first-out method, or at net realizable value. Uninstalled contract materials are certain job specific materials not yet installed, primarily for highway construction projects, which are valued using the specific identification method relating the cost incurred to a specific project. In most cases, the Company is able to invoice a state agency for the materials, but title will not pass to the state agency until the materials are installed.

Note 2—Basis of Presentation

Interim consolidated financial statements — The interim condensed consolidated financial statements for the three and six month periods ended June 30, 2017 and 2016 have been prepared in accordance with Rule 10-01 of Regulation S-X of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). As such, certain disclosures, which would substantially duplicate the disclosures contained in the Company’s Annual Report on Form 10-K, filed on February 28, 2017, which contains the Company’s audited consolidated financial statements for the year ended December 31, 2016, have been omitted.

This Second Quarter 2017 Report should be read in concert with the Company’s most recent Annual Report on Form 10-K. The interim financial information is unaudited. In the opinion of management, the interim information includes all adjustments (consisting of normal recurring adjustments) necessary for the fair presentation of the interim financial information.

Revenue recognition

Fixed-price contracts — Historically, a substantial portion of the Company’s revenue has been generated under fixed-price contracts. For fixed-price contracts, the Company recognizes revenues primarily using the percentage-of-completion method, which may result in uneven and irregular results. In the percentage-of-completion method, estimated contract values, estimated cost at completion and total costs incurred to date are used to calculate revenues earned. Unforeseen events and circumstances can alter the estimate of the costs and potential profit associated with a particular contract. Total estimated costs, and thus contract revenues and income, can be impacted by changes in productivity, scheduling, the unit cost of labor, subcontracts, materials and equipment. Additionally, external factors such as weather, client needs, client delays in providing permits and approvals, labor availability, governmental regulation and politics may affect the progress of a project’s completion and thus the timing of revenue recognition. To the extent that original cost estimates are modified, estimated costs to complete increase, delivery schedules are delayed, or progress under a contract is otherwise impeded, cash flow, revenue recognition and profitability from a particular contract may be adversely affected.

Other contract forms — The Company also uses unit price, time and material, and cost reimbursable plus fee contracts. For these jobs, revenue is recognized primarily based on contractual terms. Generally, time and material and cost reimbursement contract revenues are recognized on an input basis, based on labor hours incurred and on purchases made. Unit price contracts generally recognize revenue on an output based measurement such as the completion of specific units at a specified unit price.

The Company considers unapproved change orders to be contract variations for which customers have not agreed to both scope and price. Costs associated with unapproved change orders are included in the estimated cost to complete and are treated as project costs as incurred. The Company will recognize revenue if it is probable that the contract price will be adjusted and can be reliably estimated. Unapproved change orders involve the use of estimates, and it is reasonably possible that revisions to the estimated costs and recoverable amounts may be required in future reporting periods to reflect changes in estimates or final agreements with customers.

The Company considers claims to be amounts it seeks, or will seek, to collect from customers or others for customer-caused changes in contract specifications or design, or other customer-related causes of unanticipated additional contract costs on which there is no agreement with customers. Claims can also be caused by non-customer-caused changes, such as weather delays or rain. Costs associated with claims are included in the estimated costs to complete the contracts and are treated as project costs when incurred. Claims are included in revenue to the extent the related costs have been incurred, realization is probable, and amounts can be reliably estimated. Revenue in excess of contract costs from claims is recognized when an agreement is reached with customers as to the value of the claims, which in some instances may not occur until after completion of work under the contract.

At any time, if an estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full at that time and recognized as an “accrued loss provision” which is included in the accrued expenses and other current liabilities amount on the balance sheet. For fixed price contracts, as the percentage-of-completion method is used to calculate revenues, the accrued loss provision is changed so that the gross profit for the contract remains zero in future periods. If we anticipate that there will be a loss for unit price or cost reimbursable contracts, the projected loss is recognized in full at that time.

Changes in job performance, job conditions and estimated profitability, including those arising from final contract settlements, may result in revisions to costs and income. These revisions are recognized in the period in which the revisions are identified.

In all forms of contracts, the Company estimates its collectability of contract amounts at the same time that it estimates project costs. If the Company anticipates that there may be issues associated with the collectability of the full amount calculated as revenues, the Company may reduce the amount recognized as revenue to reflect the uncertainty associated with realization of the eventual cash collection. For example, when a cost reimbursable project exceeds the client’s expected budget amount, the client frequently requests an adjustment to the final amount. Similarly, some utility clients reserve the right to audit costs for significant periods after performance of the work. In these situations, the Company may choose to defer recognition of revenue until the client pays for the services.

The caption “Costs and estimated earnings in excess of billings” in the Consolidated Balance Sheets represents unbilled receivables which arise when revenues have been recorded but the amount will not be billed until a later date. Balances represent: (a) unbilled amounts arising from the use of the percentage-of-completion method of accounting which may not be billed under the terms of the contract until a later date or project milestone; (b) incurred costs to be billed under cost reimbursement type contracts; (c) amounts arising from routine lags in billing; or (d) the revenue associated with unapproved change orders or claims when realization is probable and amounts can be reliably determined. For those contracts in which billings exceed contract revenues recognized to date, the excess amounts are included in the caption “Billings in excess of costs and estimated earnings”.

In accordance with applicable terms of certain construction contracts, retainage amounts may be withheld by customers until completion and acceptance of the project. Some payments of the retainage may not be received for a significant period after completion of our portion of a project. In some jurisdictions, retainage amounts are deposited into an escrow account.

Significant revisions in contract estimates — Revenue recognition is based on the percentage-of-completion method for firm fixed-price contracts. Under this method, the costs incurred to date as a percentage of total estimated costs are used to calculate revenue. Total estimated costs, and thus contract revenues and margin, are impacted by many factors, which can cause significant changes in estimates during the life cycle of a project.

For projects that were in process at the end of the prior year or a prior quarter, there can be a difference in revenues and profits that would have been recognized in the prior year or prior quarter had current estimates of costs to complete been used at the end of the prior year or prior quarter.

Customer concentration — The Company operates in multiple industry segments encompassing the engineering and construction of commercial, industrial and public works infrastructure assets throughout primarily the United States. Typically, the top ten customers in any one calendar year generate revenues in excess of 50% of total revenues; however, the group that comprises the top ten customers varies from year to year.

During the three and six months ended June 30, 2017, revenues generated by the top ten customers were approximately $330.2 million and $713.5 million, respectively, which represented 52.3% and 59.8%, respectively, of total revenues during the period. During the periods, two large pipeline projects represented 11.0% and 19.2% of total revenues, respectively and Texas Department of Transportation (“TXDOT”) represented 10.6% and 10.5% of total revenues, respectively.

During the three and six months ended June 30, 2016, revenues generated by the top ten customers were $263.0 million and $533.0 million, respectively, which represented 57.7% and 60.1%, respectively, of total revenues during the period. During the periods, a Louisiana petrochemical project represented 11.3% and 12.4% of total revenues, respectively and TXDOT represented 10.2% and 11.8% of total revenues, respectively.

At June 30, 2017, approximately 11.7% of the Company’s accounts receivable were due from one customer, and that customer provided 8.8% of the Company’s revenues for the six months ended June 30, 2017. In addition, of total accounts receivable, approximately 11.0% are from one customer with whom the Company is currently in dispute resolution. See Note 17 – “Commitments and Contingencies”.

At June 30, 2016, approximately 15.6% of the Company’s accounts receivable were due from one customer, and that customer provided 12.4% of the Company’s revenues for the six months ended June 30, 2016. In addition, approximately 16.0% of total accounts receivable at June 30, 2016 were in dispute resolution.

Multiemployer plans — Various subsidiaries are signatories to collective bargaining agreements. These agreements require that the Company participate in and contribute to a number of multiemployer benefit plans for its union employees at rates determined by the agreements. The trustees for each multiemployer plan determine the eligibility and allocations of contributions and benefit amounts, determine the types of benefits, and administer the plan. Federal law requires that if the Company were to withdraw from an agreement, it would incur a withdrawal obligation. The potential withdrawal obligation may be significant. In accordance with Generally Accepted Accounting Principles (“GAAP”), any withdrawal liability would be recorded when it is probable that a liability exists and can be reasonably estimated.

Inventory and uninstalled contract materials — Inventory consists of expendable construction materials and small tools that will be used in construction projects and is valued at the lower of cost, using first-in, first-out method, or at net realizable value. Uninstalled contract materials are certain job specific materials not yet installed, primarily for highway construction projects, which are valued using the specific identification method relating the cost incurred to a specific project. In most cases, the Company is able to invoice a state agency for the materials, but title will not pass to the state agency until the materials are installed.