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REVENUE (Notes)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block]
2. REVENUE

The Corporation accounts for revenues in accordance with ASC 606, Revenue from Contracts with Customers, which was adopted as of January 1, 2018 on a modified retrospective basis. Under ASC 606, revenue is recognized when control of a promised good and/or service is transferred to a customer at a transaction price that reflects the consideration that the Corporation expects to be entitled to in exchange for that good and/or service.

Performance Obligations

The Corporation identifies a performance obligation for each promise in a contract to transfer a distinct good or service to the customer. As part of its assessment, the Corporation considers all goods and/or services promised in the contract, regardless of whether they are explicitly stated or implied by customary business practices. The Corporation’s contracts may contain either a single performance obligation, including the promise to transfer individual goods or services that are not separately distinct within the context of the respective contracts, or multiple performance obligations. For contracts with multiple performance obligations, the Corporation allocates the overall transaction price to each performance obligation using standalone selling prices, where available, or utilizes estimates for each distinct good or service in the contract where standalone prices are not available. In certain instances, the transaction price may include estimated amounts of variable consideration including but not limited to incentives, awards, price escalations, liquidated damages, and penalties, only to the extent that it is probable that a significant reversal of cumulative revenue recognized to date around such variable consideration will not occur. The Corporation estimates variable consideration to be included in the transaction price using either the expected value method or most likely amount method, contingent upon the facts and circumstances of the specific arrangement. Variable consideration associated with the Corporation’s respective arrangements is not typically constrained.

The Corporation’s performance obligations are satisfied either at a point-in-time or on an over-time basis. Revenue recognized on an over-time basis for the year ended December 31, 2019 and 2018 accounted for approximately 49% and 46%, respectively, of total net sales. Typically, over-time revenue recognition is based on the utilization of an input measure used to measure progress, such as costs incurred to date relative to total estimated costs. Changes in total estimated costs are recognized using the cumulative catch-up method of accounting which recognizes the cumulative effect of the changes on current and prior periods in the current period. Accordingly, the effect of the changes on future periods of contract performance is recognized as
if the revised estimate had been the original estimate. A significant change in an estimate on one or more contracts could have a material effect on the Corporation's consolidated financial position, results or operations, or cash flows. However, there were no significant changes in estimated contract costs during 2019, 2018, or 2017.

If a performance obligation does not qualify for over-time revenue recognition, revenue is then recognized at the point-in-time in which control of the distinct good or service is transferred to the customer, typically based upon the terms of delivery. Revenue recognized at a point-in-time for the year ended December 31, 2019 and 2018 accounted for approximately 51% and 54%, respectively, of total net sales.

Contract backlog represents the remaining performance obligations that have not yet been recognized as revenue. Backlog includes deferred revenue and amounts that will be invoiced and recognized as revenue in future periods. Total backlog was approximately $2.2 billion as of December 31, 2019, of which the Corporation expects to recognize approximately 92% as net sales over the next 12-36 months. The remainder will be recognized thereafter.

Disaggregation of Revenue

The following table presents the Corporation’s total net sales disaggregated by end market and customer type:

Total Net Sales by End Market and Customer TypeYear Ended December 31,
(In thousands)201920182017
Defense
Aerospace$416,841  $376,951  $372,678  
Ground93,432  97,131  96,042  
Naval568,776  486,476  408,221  
Total Defense Customers$1,079,049  $960,558  $876,941  
Commercial
Aerospace$433,038  $414,422  $409,384  
Power Generation392,173  431,793  423,747  
General Industrial583,701  605,062  560,954  
Total Commercial Customers$1,408,912  $1,451,277  $1,394,085  
Total$2,487,961  $2,411,835  $2,271,026  

Contract Balances

Timing of revenue recognition and cash collection may result in billed receivables, unbilled receivables (contract assets), and deferred revenue (contract liabilities) on the Consolidated Balance Sheet. The Corporation’s contract assets primarily relate to its rights to consideration for work completed but not billed as of the reporting date. Contract assets are transferred to billed receivables when the rights to consideration become unconditional. This is typical in situations where amounts are billed as work progresses in accordance with agreed-upon contractual terms or upon achievement of contractual milestones. The Corporation’s contract liabilities primarily consist of customer advances received prior to revenue being earned. Revenues recognized for the years ended December 31, 2019 and 2018 included in the contract liabilities balance at the beginning of the respective years were approximately $198 million and $164 million, respectively. Changes in contract assets and contract liabilities as of December 31, 2019 were not materially impacted by any other factors. Contract assets and contract liabilities are reported in the "Receivables, net" and "Deferred revenue" lines, respectively, within the Consolidated Balance Sheet.

Pre-adoption of ASC 606

As the Corporation adopted ASC 606 using the modified retrospective method, the Consolidated Financial Statements for the year ended December 31, 2017 were not retrospectively adjusted. For the year ended December 31, 2017, revenue was recognized when the earnings process was considered substantially complete with all of the following criteria met: 1) persuasive evidence of an arrangement existed; 2) delivery occurred or services were rendered; 3) the Corporation's price to its customer was fixed or determinable; and 4) collectability was reasonably assured. The Corporation determined the appropriate revenue recognition method by analyzing the terms and conditions of each contract. Revenue was recognized on product sales
as production units were shipped and title and risk of loss was transferred. Revenue was recognized on service-type contracts as services were rendered. The significant estimates made in recognizing revenue were primarily for long-term contracts, which were generally accounted for using the cost-to-cost method of percentage of completion accounting. Under the cost-to-cost method, profits were recorded pro-rata, based upon estimates of direct and indirect costs to complete such contracts. Any changes in estimates of contract sales, costs, or profits were recognized using the cumulative catch-up method of accounting.