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Revenue Recognition (Tables) | 12 Months Ended
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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, 2023 |  | Year Ended December 31, 2022 |  | Year Ended December 31, 2021
|  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total
|  | (In thousands)
United States: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government |  | $ | 1,884,671 |  |  | $ | — |  |  |  |  | $ | 1,884,671 |  |  | $ | 1,703,005 |  |  | $ | — |  |  |  |  | $ | 1,703,005 |  |  | $ | 1,624,078 |  |  | $ | — |  |  |  |  | $ | 1,624,078 |
Non-Government |  | 123,604 |  |  | 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-Government |  | 778 |  |  | 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-Government |  | 12,023 |  |  | 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, 2023 |  | Year Ended December 31, 2022 |  | Year Ended December 31, 2021
|  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total
|  | (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-time |  | 18,388 |  |  | 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, 2023 |  | Year Ended December 31, 2022 |  | Year Ended December 31, 2021
|  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total |  | Government Operations |  | Commercial Operations |  |  |  | Total
|  | (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-Price |  | 469,138 |  |  | 312,236 |  |  |  |  | 781,374 |  |  | 334,076 |  |  | 300,129 |  |  |  |  | 634,205 |  |  | 307,652 |  |  | 307,200 |  |  |  |  | 614,852 |
Cost-Plus Fee |  | 337,598 |  |  | — |  |  |  |  | 337,598 |  |  | 244,063 |  |  | — |  |  |  |  | 244,063 |  |  | 165,519 |  |  | — |  |  |  |  | 165,519 |
Time-and-Materials |  | 6,085 |  |  | 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,
|  | 2023 |  | 2022
|  | (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,
|  | 2023 |  | 2022 |  | 2021
|  | (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.

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