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CONTRACT ASSETS AND LIABILITIES
 12 Months Ended
Dec. 31, 2021
Contractors [Abstract]  
CONTRACT ASSETS AND LIABILITIES CONTRACT ASSETS AND LIABILITIES
Under our customized pump production contracts in our IPS segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms, upon various measures of performance, including achievement of certain milestones, completion of specified units, or completion of a contract. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. Our contract assets are presented as “Cost and estimated profits in excess of billings” on our Consolidated Balance Sheets. However, we sometimes receive advances or deposits from our customers before revenue is recognized, resulting in contract liabilities that are presented as “Billings in excess of costs and estimated profits” on our Consolidated Balance Sheets.

Costs and estimated profits on uncompleted contracts and related amounts billed for 2021 and 2020 were as follows (in thousands):
 December 31,
 20212020
Costs incurred on uncompleted contracts$41,329 $36,969 
Estimated profits, thereon17,143 6,711 
Total$58,472 $43,680 
Less: billings to date44,859 29,315 
Net$13,613 $14,365 
Such amounts were included in the accompanying Consolidated Balance Sheets for 2021 and 2020 under the following captions (in thousands):
 December 31,
 20212020
Costs and estimated profits in excess of billings $17,193 $18,459 
Billings in excess of costs and estimated profits(3,581)(4,061)
Translation Adjustment1 (33)
Net$13,613 $14,365 
During the twelve months ended December 31, 2021, $4.0 million of the balances that were previously classified as contract liabilities at the beginning of the period shipped. Contract assets and liability changes were primarily due to normal activity and timing differences between our performance and customer payments.