Revisions in Estimates Revisions in Estimates (Policies)	3 Months Ended
Mar. 31, 2015
Revisions in Estimates [Abstract]
Revision in Estimate	Our profit recognition related to construction contracts is based on estimates of costs to complete each project. These estimates can vary significantly in the normal course of business as projects progress, circumstances develop and evolve, and uncertainties are resolved. We recognize revenue associated with unapproved change orders and, effective in the first quarter of 2015, affirmative claims to the extent the related costs have been incurred, the amount can be reliably estimated and recovery is probable. Prior to 2015, we recognized revenue on affirmative claims when we had a signed agreement. See Note 1 for further discussion. We recognize revisions to estimated total costs as soon as the obligation to perform is determined. When we experience significant changes in our estimates of costs to complete, we undergo a process that includes reviewing the nature of the changes to ensure that there are no material amounts that should have been recorded in a prior period rather than as a revision in estimates for the current period. In our review of these changes for the three months ended March 31, 2015 and 2014, we did not identify any amounts that should have been recorded in a prior period. We use the cumulative catch-up method applicable to construction contract accounting to account for revisions in estimates. Under this method, revisions in estimates are accounted for in their entirety in the period of change. There can be no assurance that we will not experience future changes in circumstances or otherwise be required to revise our profitability estimates. Revenue in an amount equal to cost incurred is recognized if there is not sufficient information to determine the estimated profit on the project with a reasonable level of certainty.

Our profit recognition related to construction contracts is based on estimates of costs to complete each project. These estimates can vary significantly in the normal course of business as projects progress, circumstances develop and evolve, and uncertainties are resolved. We recognize revenue associated with unapproved change orders and, effective in the first quarter of 2015, affirmative claims to the extent the related costs have been incurred, the amount can be reliably estimated and recovery is probable. Prior to 2015, we recognized revenue on affirmative claims when we had a signed agreement. See Note 1 for further discussion.

We recognize revisions to estimated total costs as soon as the obligation to perform is determined. When we experience significant changes in our estimates of costs to complete, we undergo a process that includes reviewing the nature of the changes to ensure that there are no material amounts that should have been recorded in a prior period rather than as a revision in estimates for the current period. In our review of these changes for the three months ended March 31, 2015 and 2014, we did not identify any amounts that should have been recorded in a prior period. We use the cumulative catch-up method applicable to construction contract accounting to account for revisions in estimates. Under this method, revisions in estimates are accounted for in their entirety in the period of change. There can be no assurance that we will not experience future changes in circumstances or otherwise be required to revise our profitability estimates.

Revenue in an amount equal to cost incurred is recognized if there is not sufficient information to determine the estimated profit on the project with a reasonable level of certainty.