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Revenue Recognition (Tables)
12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Disaggregated Revenues
We allocate geographic revenues based on the location of the customers' operations. Revenues by geographic area and customer type were as follows:
 Year Ended December 31, 2023Year Ended December 31, 2022Year Ended December 31, 2021
Government OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotal
 (In thousands)
United States:
Government$1,884,671 $— $1,884,671 $1,703,005 $— $1,703,005 $1,624,078 $— $1,624,078 
Non-Government123,604 57,654 181,258 91,653 31,120 122,773 90,421 44,102 134,523 
$2,008,275 $57,654 $2,065,929 $1,794,658 $31,120 $1,825,778 $1,714,499 $44,102 $1,758,601 
Canada:
Government$245 $— $245 $79 $— $79 $— $— $— 
Non-Government778 389,234 390,012 3,134 373,705 376,839 3,417 345,412 348,829 
$1,023 $389,234 $390,257 $3,213 $373,705 $376,918 $3,417 $345,412 $348,829 
Other:
Government$10,016 $— $10,016 $1,356 $— $1,356 $— $— $— 
Non-Government12,023 19,456 31,479 9,256 22,533 31,789 7,181 17,568 24,749 
$22,039 $19,456 $41,495 $10,612 $22,533 $33,145 $7,181 $17,568 $24,749 
Segment Revenues$2,031,337 $466,344 2,497,681 $1,808,483 $427,358 2,235,841 $1,725,097 $407,082 2,132,179 
Eliminations(1,372)(3,007)(8,105)
Revenues$2,496,309 $2,232,834 $2,124,074 
Revenues by timing of transfer of goods or services were as follows:
 Year Ended December 31, 2023Year Ended December 31, 2022Year Ended December 31, 2021
Government OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotal
 (In thousands)
Over time$2,012,949 $392,060 $2,405,009 $1,798,388 $370,198 $2,168,586 $1,724,961 $355,477 $2,080,438 
Point-in-time18,388 74,284 92,672 10,095 57,160 67,255 136 51,605 51,741 
Segment Revenues$2,031,337 $466,344 2,497,681 $1,808,483 $427,358 2,235,841 $1,725,097 $407,082 2,132,179 
Eliminations(1,372)(3,007)(8,105)
Revenues$2,496,309 $2,232,834 $2,124,074 
Revenues by contract type were as follows:
 Year Ended December 31, 2023Year Ended December 31, 2022Year Ended December 31, 2021
Government OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotalGovernment OperationsCommercial OperationsTotal
 (In thousands)
Fixed-Price Incentive Fee$1,218,516 $11,119 $1,229,635 $1,226,265 $9,728 $1,235,993 $1,244,916 $9,279 $1,254,195 
Firm-Fixed-Price469,138 312,236 781,374 334,076 300,129 634,205 307,652 307,200 614,852 
Cost-Plus Fee337,598 — 337,598 244,063 — 244,063 165,519 — 165,519 
Time-and-Materials6,085 142,989 149,074 4,079 117,501 121,580 7,010 90,603 97,613 
Segment Revenues$2,031,337 $466,344 2,497,681 $1,808,483 $427,358 2,235,841 $1,725,097 $407,082 2,132,179 
Eliminations(1,372)(3,007)(8,105)
Revenues$2,496,309 $2,232,834 $2,124,074 
Contract with Customer, Asset and Liability Retainages also vary as a result of timing differences between incurring costs and achieving milestones that allow us to recover these amounts.
 December 31,December 31,
 20232022
 (In thousands)
Included in Contracts in progress:
Unbilled receivables$519,931 $521,291 
Retainages$55,181 $48,566 
Advance billings on contracts$107,391 $88,726 
Revenue, Performance Obligation, Impact Of Changes In Estimates The aggregate impact of changes in estimates increased our revenue and operating income as follows:
 Year Ended December 31,
 202320222021
 (In thousands)
Revenues$24,728 $26,629 $30,719 
Operating Income (1)
$24,813 $24,405 $26,540 
(1)During the year ended December 31, 2023, our Government Operations segment results were favorably impacted by contract adjustments related to a nuclear operations contract which resulted in an increase in operating income of $22.5 million. Our Government Operations segment also recognized favorable adjustments totaling $27.9 million as a result of the successful negotiation of change orders related to cost growth that was driven by out-of-scope changes associated with the manufacture of non-nuclear components.
During the year ended December 31, 2022, our Government Operations segment results were negatively affected by contract adjustments for cost growth related to the manufacture of non-nuclear components which resulted in a decrease in operating income of $11.3 million.
During the year ended December 31, 2021, no adjustment to any one contract had a material impact on our consolidated financial statements.