| Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] | – REVENUE RECOGNITION AND CONTRACTS Adoption of Accounting Standards Codification ("ASC") Topic 606, Revenue from Contracts with Customers ("Topic 606") On January 1, 2018, we adopted Topic 606 using the modified retrospective method applied to all contracts that were not completed as of January 1, 2018. Results for reporting periods beginning on or after January 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period. We recorded a $0.5 million net increase to opening retained earnings as of January 1, 2018 from the cumulative effect of adopting Topic 606 that primarily related to transitioning the timing of certain sales commissions expense. The effect on revenue from adopting Topic 606 was not material for the three months ended March 31, 2018. Revenue recognition A performance obligation is a contractual promise to transfer a distinct good or service to the customer. A contract's transaction price is allocated to each distinct performance obligation and is recognized as revenue when (point in time) or as (over time) the performance obligation is satisfied. Revenue from goods and services transferred to customers at a point in time, which includes certain aftermarket parts and services primarily in the Power and Industrial segments, accounted for 28% and 29% of our revenue for the three months ended March 31, 2018 and 2017, respectively. Revenue on these contracts is recognized when the customer obtains control of the asset, which is generally upon delivery and acceptance by the customer. Standard commercial payment terms generally apply to these sales. Revenue from products and services transferred to customers over time accounted for 72% and 71% of our revenue for the three months ended March 31, 2018 and 2017, respectively. Revenue recognized over time primarily relates to customized, engineered solutions and construction services from all three of our segments. Typically, revenue is recognized over time using the percentage-of-completion method that uses costs incurred to date relative to total estimated costs at completion to measure progress toward satisfying our performance obligations. Incurred cost represents work performed, which corresponds with, and thereby best depicts, the transfer of control to the customer. Contract costs include labor, material, overhead and, when appropriate, SG&A expenses. Variable consideration in these contracts includes estimates of liquidated damages, contractual bonuses and penalties, and contract modifications. Substantially all of our revenue recognized over time under the percentage-of-completion method contain a single performance obligation as the interdependent nature of the goods and services provided prevents them from being separately identifiable within the contract. Generally, we try to structure contract milestones to mirror our expected cash outflows over the course of the contract; however, the timing of milestone receipts can greatly affect our overall cash position and have in 2018 in our Renewable segment. Refer to Note 3 for our disaggregation of revenue by product line. Contract modifications are routine in the performance of our contracts. Contracts are often modified to account for changes in the contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct and, therefore, are accounted for as part of the existing contract, with cumulative adjustment to revenue. We recognize accrued claims in contract revenues for extra work or changes in scope of work to the extent of costs incurred when we believe we have an enforceable right to the modification or claim and the amount can be estimated reliably and its realization is probable. In evaluating these criteria, we consider the contractual/legal basis for the claim, the cause of any additional costs incurred, the reasonableness of those costs and the objective evidence available to support the claim. We generally recognize sales commissions in equal proportion as revenue is recognized. Our sales agreements are structured such that commissions are only payable upon receipt of payment, thus a capitalized asset at contract inception has not been recorded for sales commission as a liability has not been incurred at that point. Contract balances Contracts in progress, a current asset in our condensed consolidated balance sheets, includes revenues and related costs so recorded, plus accumulated contract costs that exceed amounts invoiced to customers under the terms of the contracts. Advance billings, a current liability in our consolidated balance sheets, includes advance billings on contracts invoices that exceed accumulated contract costs and revenues and costs recognized under the percentage-of-completion method. Most long-term contracts contain provisions for progress payments. Our unbilled receivables do not contain an allowance for credit losses as we expect to invoice customers and collect all amounts for unbilled revenues. We review contract price and cost estimates periodically as the work progresses and reflect adjustments proportionate to the percentage-of-completion in income in the period when those estimates are revised. For all contracts, if a current estimate of total contract cost indicates a loss on a contract, the projected contract loss is recognized in full in the statement of operations and an accrual for the estimated loss on the uncompleted contract is included in other current liabilities in the balance sheet. In addition, when we determine that an uncompleted contract will not be completed on-time and the contract has liquidated damages provisions, we recognize the estimated liquidated damages we will incur and record them as a reduction of the estimated selling price in the period the change in estimate occurs. Losses accrued in advance of the percentage-of-completion of a contract are included in other accrued liabilities, a current liability, in our consolidated balance sheets. The following represent the components of our contracts in progress and advance billings on contracts included in our consolidated balance sheets: March 31, December 31, (in thousands) 2018 2017 Contract assets - included in contracts in progress: Costs incurred less costs of revenue recognized $ 80,663 $ 80,645 Revenues recognized less billings to customers 81,016 80,575 Contracts in progress $ 161,679 $ 161,220 Contract liabilities - included in advance billings on contracts: Billings to customers less revenues recognized $ 162,115 $ 177,953 Costs of revenue recognized less cost incurred 1,198 3,117 Advance billings on contracts $ 163,313 $ 181,070 Accrued contract losses $ 47,557 $ 40,634 The impact of adopting Topic 606 on components of our contracts in progress and advance billings on contracts was not material at March 31, 2018. Backlog On March 31, 2018 we had $1,763 million of remaining performance obligations, which we also refer to as total backlog. We expect to recognize approximately 44% , 15% and 42% of our remaining performance obligations as revenue in the remainder of 2018, 2019 and thereafter, respectively. Changes in contract estimates As of March 31, 2018, we have estimated the costs to complete all of our in-process contracts in order to estimate revenues in accordance with the percentage-of-completion method of accounting. However, it is possible that current estimates could change due to unforeseen events, which could result in adjustments to overall contract costs. The risk on fixed-priced contracts is that revenue from the customer does not cover increases in our costs. It is possible that current estimates could materially change for various reasons, including, but not limited to, fluctuations in forecasted labor productivity, transportation, fluctuations in foreign exchange rates or steel and other raw material prices. Increases in costs on our fixed-price contracts could have a material adverse impact on our consolidated financial condition, results of operations and cash flows. Alternatively, reductions in overall contract costs at completion could materially improve our consolidated financial condition, results of operations and cash flows. Variations from estimated contract performance could result in material adjustments to operating results for any fiscal quarter or year. In the three months ended March 31, 2018 and 2017 , we recognized changes in estimated gross profit related to long-term contracts accounted for on the percentage-of-completion basis, which are summarized as follows: Three Months Ended March 31, (in thousands) 2018 2017 Increases in gross profits for changes in estimates for over time contracts $ 5,337 $ 15,092 Decreases in gross profits for changes in estimates for over time contracts (54,865 ) (8,963 ) Net changes in gross profits for changes in estimates for over time contracts $ (49,528 ) $ 6,129 Renewable loss contracts We had four renewable energy contracts in Europe that were loss contracts at December 31, 2016. During the three months ended June 30, 2017, two additional renewable energy contracts in Europe became loss contracts. In the three months ended March 31, 2018 and March 31, 2017, we recorded $52.6 million in net losses and $0.5 million in net gains, respectively, resulting from changes in the estimated revenues and costs to complete certain European renewable energy contracts. These changes in estimates in the three months ended March 31, 2018 and 2017 included an increase in our estimate of anticipated liquidated damages that reduced revenue associated with these six contracts by $13.3 million and a decrease of $2.9 million , respectively. The total anticipated liquidated damages associated with these six contracts was $90.3 million and $77.1 million at March 31, 2018 and December 31, 2017 , respectively. The charges recorded in the three months ended March 31, 2018 were due to revisions in the estimated revenues and costs at completion during the period across the six loss contracts described below. As of March 31, 2018 , the status of these six loss contracts was as follows: The first contract became a loss contract in the second quarter of 2016. As of March 31, 2018 , this contract is approximately 97% complete and construction activities are complete as of the date of this report. The unit became operational during the second quarter of 2017, and turnover activities linked to the customer's operation of the facility are expected to be completed in mid-2018. During the quarter ended March 31, 2018 , we recognized additional contract losses of $7.1 million on the contract as a result of differences in actual and estimated costs and schedule delays. Our estimate at completion as of March 31, 2018 includes $10.0 million of total expected liquidated damages. As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $2.7 million . In the quarter ended March 31, 2017 , we did not recognize any additional charges from changes in our estimate at completion, and as of March 31, 2017 , this contract had $3.8 million of accrued losses and was 93% complete. The second contract became a loss contract in the fourth quarter of 2016. As of March 31, 2018 , this contract was approximately 87% complete. Commissioning activities began in the first quarter of 2018 and we expect construction will be completed on this contract and that it will startup in mid-2018. During the quarter ended March 31, 2018 , we recognized contract losses of $4.1 million on this contract as a result of changes in construction cost estimates, subcontractor productivity being lower than previous estimates, and additional expected punch list and commissioning cost. Our estimate at completion as of March 31, 2018 includes $20.7 million of total expected liquidated damages due to schedule delays. Our estimate at completion as of March 31, 2018 also includes contractual bonus opportunities for guaranteed higher power output (discussed further below). As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $9.4 million . In the quarter ended March 31, 2017 , we recognized gains of $3.8 million from changes in our estimate at completion, and as of March 31, 2017 , this contract had $2.5 million of accrued losses and was 78% complete. The third contract became a loss contract in the fourth quarter of 2016. As of March 31, 2018 , this contract was approximately 98% complete and construction activities are complete as of the date of this report. The unit became operational during the second quarter of 2017, and partial takeover was achieved in March 2018. Remaining activities relate to punch list and finalization and are planned to be completed during the customer's next planned outage later in 2018. During the quarter ended March 31, 2018 , we recognized additional contract losses of $1.9 million as a result of changes in the estimated costs at completion. Our estimate at completion as of March 31, 2018 includes $7.4 million of total expected liquidated damages due to schedule delays. As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $0.8 million . In the quarter ended March 31, 2017 , we recognized charges of $2.8 million from changes in our estimate at completion, and as of March 31, 2017 , this contract had $3.4 million of accrued losses and was 86% complete. The fourth contract became a loss contract in the fourth quarter of 2016. As of March 31, 2018 , this contract was approximately 87% complete. Commissioning activities began in the first quarter of 2018 and we expect construction will be completed on this contract and that it will startup in mid-2018. During the quarter ended March 31, 2018 , we revised our estimated revenue and costs at completion for this loss contract, which resulted in $12.1 million of additional contract losses due to subcontractor productivity being lower than previous estimates, additional expected punch list and commissioning cost, estimated claim settlements and estimated liquidated damages. Our estimate at completion as of March 31, 2018 includes $16.2 million of total expected liquidated damages due to schedule delays. Our estimate at completion as of March 31, 2018 also includes contractual bonus opportunities for guaranteed higher power output (discussed further below). As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $5.7 million . In the quarter ended March 31, 2017 , we recognized gains of $1.9 million from changes in our estimate at completion, and as of March 31, 2017 , this contract had $0.7 million of accrued losses and was 68% complete. The fifth contract became a loss contract in the second quarter of 2017. As of March 31, 2018 , this contract was approximately 61% complete, and we expect construction will be completed on this contract in late 2018 with turnover activities in early 2019. During the quarter ended March 31, 2018 , we revised our estimated revenue and costs at completion for this loss contract, which resulted in $18.2 million of additional contract losses. First quarter 2018 changes in estimate on this fifth contract relate primarily to taking over of the civil scope from our joint venture partner, which entered administration (similar to filing for bankruptcy in the U.S.) in late February 2018 and receiving regulatory release later than expected to begin repairs to the failed steel beam, which further increased costs to complete remaining work streams in a compressed time frame. Our estimate at completion as of March 31, 2018 includes $21.9 million of total expected liquidated damages due to schedule delays. As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $23.5 million . Although not a loss contract in the quarter ended March 31, 2017 , we recognized charges of $2.5 million from changes in our estimate at completion, and as of March 31, 2017 , this contract was 48% complete. This fifth project also includes a rejection clause that gives the customer the option to reject the deliverable, recover all monies paid to us and our partner (up to approximately $153 million ), and require us to restore the property to its original state if a certain contractual milestone is not met by September 30, 2018. Meeting the contract milestone by September 30, 2018 will require, among other things, the coordination of and cooperation from various subcontractors. Any material productivity or timing issues relating to those subcontractors may jeopardize our ability to meet the contract milestone. We are working with the customer and expect to satisfy their requirements related to this contractual milestone. Our project plans include accelerating construction work and taking other remedial actions, if necessary, to avoid the exercise of the rejection clause. The sixth contract became a loss contract in the second quarter of 2017. As of March 31, 2018 , this contract was approximately 83% complete, and we expect construction will be completed on this contract and that it will startup in the second half of 2018. During the quarter ended March 31, 2018 , we revised our estimated revenue and costs at completion for this loss contract, which resulted in additional contract losses of $9.3 million due to additional schedule delays, inclusive of liquidated damages, and estimated claim settlements. Our estimate at completion as of December 31, 2017 includes $14.2 million of total expected liquidated damages due to schedule delays. The change in the status of this contract in 2018 was primarily attributable to changes in the estimated costs at completion and schedule delays. As of March 31, 2018 , the reserve for estimated contract losses recorded in "other accrued liabilities" in our condensed consolidated balance sheet was $3.5 million . As of March 31, 2017 , this contract was 55% complete. In September 2017, we identified the failure of a structural steel beam on the fifth contract, which stopped work in the boiler building and other areas pending corrective actions to stabilize the structure that are expected to be complete in the first half of 2018. Provisional regulatory approval to begin structural repairs to the failed beam was obtained at the end of March 2018 (later than previously estimated) and full approval to proceed with repairs was obtained in April 2018. The engineering, design and manufacturing of the steel structure were the responsibility of our subcontractors. A similar design was also used on the second and fourth contracts, and although no structural failure occurred on these two other contracts, work was also stopped in certain restricted areas while we added reinforcement to the structures, which also resulted in delays that lasted until late January 2018. The total costs related to the structural steel issues on these three contracts, including contract delays, are estimated to be approximately $48 million , which is included in the March 31, 2018 estimated losses at completion for these three contracts. Also during the third quarter of 2017, we adjusted the design of three renewable facilities to increase the guaranteed power output, which will allow us to achieve contractual bonus opportunities for the higher output. In the fourth quarter of 2017, we obtained agreement from certain customers to increase the value of these bonus opportunities and to provide partial relief on liquidated damages. The bonus opportunities and liquidated damages relief increased the estimated selling price of the three contracts by approximately $19 million in total, and this positive change in estimated cost to complete was fully recognized in 2017 because each were loss contracts. During the third quarter of 2016, we determined it was probable that we would receive a $15.0 million insurance recovery for a portion of the losses on the first European renewable energy contract discussed above. There was no change in the accrued probable insurance recovery at March 31, 2018 . The insurance recovery represents the full amount available under the insurance policy, and is recorded in accounts receivable - other in our condensed consolidated balance sheet at March 31, 2018 and 2017 . |
