Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

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.