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REVENUE
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block] REVENUE
The Corporation recognizes revenue when control of a promised good and/or service is transferred to a customer in an amount 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.

The Corporation’s performance obligations are satisfied either at a point-in-time or on an over-time basis. 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. 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.

The following table illustrates the approximate percentage of revenue recognized for performance obligations satisfied over-time versus at a point-in-time for the three months ended March 31, 2021 and 2020:

Three Months Ended
March 31,
20212020
Over-time52 %52 %
Point-in-time48 %48 %

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 $2.1 billion as of March 31, 2021, of which the Corporation expects to recognize approximately 88% as net sales over the next 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 TypeThree Months Ended
March 31,
(In thousands)20212020
Aerospace & Defense
Aerospace Defense$111,016 $101,827 
Ground Defense55,746 22,657 
Naval Defense177,905 165,693 
Commercial Aerospace57,269 100,680 
Total Aerospace & Defense$401,936 $390,857 
Commercial
Power & Process105,504 123,926 
General Industrial89,619 86,448 
Total Commercial$195,123 $210,374 
Total$597,059 $601,231 

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 Condensed 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. Revenue recognized during the three months ended March 31, 2021 and 2020 included in contract liabilities at the beginning of the respective years was approximately $77 million and $89 million, respectively. Contract assets and contract liabilities are reported in the "Receivables, net" and "Deferred revenue" lines, respectively, within the Condensed Consolidated Balance Sheet.