Recent Accounting Standards (Policy)	6 Months Ended
Jun. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	Accounting Standard Adopted In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation—Stock Compensation (Topic 718) ("ASU 2016-09"), which simplifies several areas of accounting for share-based compensation arrangements. Upon adoption, ASU 2016-09 requires that excess tax benefits or deficiencies for share-based payments be recorded as income tax expense or benefit and reflected within operating cash flows rather than being recorded within equity and reflected within financing cash flows. The standard also requires companies to make an accounting policy election on whether to account for forfeitures on share-based payments by 1) recognizing forfeitures as they occur; or 2) estimating the number of awards expected to be forfeited and periodically adjusting the estimate, as was previously required. The standard is effective for annual and interim reporting periods of public companies beginning after December 15, 2016, although early adoption was permitted. We adopted ASU 2016-09 on January 1, 2017 and elected to make an accounting policy change to recognize forfeitures as they occur. The impact of adoption on the condensed consolidated balance sheet was a cumulative-effect adjustment of $0.1 million, decreasing opening retained earnings. We recognized an income tax benefit of $0.1 million relating to excess tax benefits on stock-based compensation awards during the six months ended June 30, 2017 and could experience volatility in our effective income tax rate in the future as a result of this accounting change. We also elected to prospectively apply the change in presentation on the statement of cash flows and did not reclassify excess tax benefits on stock-based compensation from financing to operating cash flows for the prior period presented. Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. The ASU’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for public companies for annual and interim periods beginning after December 15, 2017, which requires us to adopt the standard in the first quarter of 2018. Companies can elect to apply the provisions of ASU 2014-09 either retrospectively to each prior reporting period presented or retrospectively with a cumulative effect adjustment recognized at the date of adoption. We plan to adopt the standard effective January 1, 2018 using the modified retrospective approach with a cumulative effect adjustment at the date of adoption. Based on our assessment to date, we believe the new standard could result in a change in revenue recognition on certain fixed price projects from a proportional performance method, where revenue is currently recognized over contract performance, to a completed contract method, where revenue would be recognized upon completion of our performance obligations. This change could result in a shift in the timing of revenue recognition, causing quarter to quarter revenue fluctuations. We are continuing to evaluate ASU 2014-09 and the impact of its adoption on our consolidated financial statements and plan to provide additional information at a future date. In February 2016, the FASB issued ASU No. 2016-02, Leases. This standard will require all leases with durations greater than twelve months to be recognized on the balance sheet as a right-of-use asset and a lease liability. ASU 2016-02 is effective for public companies for annual reporting periods beginning after December 15, 2018, and interim periods within those fiscal years. We believe adoption of this standard will have a significant impact on our consolidated balance sheets because we will need to recognize substantially all of our operating leases as right-of-use assets and lease liabilities on our balance sheet. Although we have not completed our assessment, we do not expect the adoption of ASU 2016-02 to materially change the recognition and measurement of lease expense within the consolidated statements of operations. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment. The standard will remove step 2 from the goodwill impairment test. Under the ASU, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We are currently evaluating ASU 2017-04 and the impact of its adoption on our consolidated financial statements.

Accounting Standard Adopted

In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation—Stock Compensation (Topic 718) ("ASU 2016-09"), which simplifies several areas of accounting for share-based compensation arrangements. Upon adoption, ASU 2016-09 requires that excess tax benefits or deficiencies for share-based payments be recorded as income tax expense or benefit and reflected within operating cash flows rather than being recorded within equity and reflected within financing cash flows. The standard also requires companies to make an accounting policy election on whether to account for forfeitures on share-based payments by 1) recognizing forfeitures as they occur; or 2) estimating the number of awards expected to be forfeited and periodically adjusting the estimate, as was previously required. The standard is effective for annual and interim reporting periods of public companies beginning after December 15, 2016, although early adoption was permitted. We adopted ASU 2016-09 on January 1, 2017 and elected to make an accounting policy change to recognize forfeitures as they occur. The impact of adoption on the condensed consolidated balance sheet was a cumulative-effect adjustment of $0.1 million, decreasing opening retained earnings. We recognized an income tax benefit of $0.1 million relating to excess tax benefits on stock-based compensation awards during the six months ended June 30, 2017 and could experience volatility in our effective income tax rate in the future as a result of this accounting change. We also elected to prospectively apply the change in presentation on the statement of cash flows and did not reclassify excess tax benefits on stock-based compensation from financing to operating cash flows for the prior period presented.

Accounting Standards Not Yet Adopted

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. The ASU’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for public companies for annual and interim periods beginning after December 15, 2017, which requires us to adopt the standard in the first quarter of 2018. Companies can elect to apply the provisions of ASU 2014-09 either retrospectively to each prior reporting period presented or retrospectively with a cumulative effect adjustment recognized at the date of adoption. We plan to adopt the standard effective January 1, 2018 using the modified retrospective approach with a cumulative effect adjustment at the date of adoption. Based on our assessment to date, we believe the new standard could result in a change in revenue recognition on certain fixed price projects from a proportional performance method, where revenue is currently recognized over contract performance, to a completed contract method, where revenue would be recognized upon completion of our performance obligations. This change could result in a shift in the timing of revenue recognition, causing quarter to quarter revenue fluctuations. We are continuing to evaluate ASU 2014-09 and the impact of its adoption on our consolidated financial statements and plan to provide additional information at a future date.

In February 2016, the FASB issued ASU No. 2016-02, Leases. This standard will require all leases with durations greater than twelve months to be recognized on the balance sheet as a right-of-use asset and a lease liability. ASU 2016-02 is effective for public companies for annual reporting periods beginning after December 15, 2018, and interim periods within those fiscal years. We believe adoption of this standard will have a significant impact on our consolidated balance sheets because we will need to recognize substantially all of our operating leases as right-of-use assets and lease liabilities on our balance sheet. Although we have not completed our assessment, we do not expect the adoption of ASU 2016-02 to materially change the recognition and measurement of lease expense within the consolidated statements of operations.

In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment. The standard will remove step 2 from the goodwill impairment test. Under the ASU, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2019. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We are currently evaluating ASU 2017-04 and the impact of its adoption on our consolidated financial statements.