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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, 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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Revenue, Performance Obligation, Impact Of Changes In Estimates

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- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

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Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

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