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Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Disaggregated Revenues

Revenues by geographical area and customer type were as follows:

						Year Ended December 31, 2020																								Year Ended December 31, 2019																								Year Ended December 31, 2018
						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total
						(In thousands)
United States:
Government						$	1,540,256					$	—					$	113,075					$	1,653,331					$	1,368,555					$	—					$	111,236					$	1,479,791					$	1,311,886					$	—					$	107,711					$	1,419,597
Non-Government						98,986						35,432						19,061						153,479						51,802						38,058						17,907						107,767						4,146						16,059						11,831						32,036
						$	1,639,242					$	35,432					$	132,136					$	1,806,810					$	1,420,357					$	38,058					$	129,143					$	1,587,558					$	1,316,032					$	16,059					$	119,542					$	1,451,633
Canada:
Non-Government						$	—					$	309,433					$	4,357					$	313,790					$	—					$	287,948					$	2,196					$	290,144					$	161					$	294,781					$	2,758					$	297,700
Other:
Non-Government						$	7,015					$	26,404					$	—					$	33,419					$	8,230					$	26,634					$	—					$	34,864					$	2,977					$	55,071					$	138					$	58,186
Segment Revenues						$	1,646,257					$	371,269					$	136,493					2,154,019						$	1,428,587					$	352,640					$	131,339					1,912,566						$	1,319,170					$	365,911					$	122,438					1,807,519
Eliminations																								(30,503)																								(17,646)																								(7,630)
Revenues																								$	2,123,516																							$	1,894,920																							$	1,799,889

Revenues by timing of transfer of goods or services were as follows:

						Year Ended December 31, 2020																								Year Ended December 31, 2019																								Year Ended December 31, 2018
						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total
						(In thousands)																								(In thousands)																								(In thousands)
Over time						$	1,646,092					$	322,745					$	136,493					$	2,105,330					$	1,428,348					$	305,075					$	131,339					$	1,864,762					$	1,318,884					$	335,430					$	122,438					$	1,776,752
Point-in-time						165						48,524						—						48,689						239						47,565						—						47,804						286						30,481						—						30,767
Segment Revenues						$	1,646,257					$	371,269					$	136,493					2,154,019						$	1,428,587					$	352,640					$	131,339					1,912,566						$	1,319,170					$	365,911					$	122,438					1,807,519
Eliminations																								(30,503)																								(17,646)																								(7,630)
Revenues																								$	2,123,516																							$	1,894,920																							$	1,799,889

Revenues by contract type were as follows:

						Year Ended December 31, 2020																								Year Ended December 31, 2019																								Year Ended December 31, 2018
						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total						Nuclear Operations Group						Nuclear Power Group						Nuclear Services Group						Total
						(In thousands)																								(In thousands)																								(In thousands)
Fixed-Price Incentive Fee						$	1,226,770					$	1,578					$	—					$	1,228,348					$	1,137,883					$	2,511					$	—					$	1,140,394					$	1,041,083					$	16,165					$	—					$	1,057,248
Firm-Fixed-Price						306,296						296,394						32,334						635,024						210,631						282,014						26,163						518,808						195,030						252,893						23,294						471,217
Cost-Plus Fee						112,479						—						94,320						206,799						79,741						755						102,726						183,222						80,880						45						96,566						177,491
Time-and-Materials						712						73,297						9,839						83,848						332						67,360						2,450						70,142						2,177						96,808						2,578						101,563
Segment Revenues						$	1,646,257					$	371,269					$	136,493					2,154,019						$	1,428,587					$	352,640					$	131,339					1,912,566						$	1,319,170					$	365,911					$	122,438					1,807,519
Eliminations																								(30,503)																								(17,646)																								(7,630)
Revenues																								$	2,123,516																							$	1,894,920																							$	1,799,889

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,
						2020						2019
						(In thousands)
Included in Contracts in progress:
Unbilled receivables						$	436,279					$	365,861
Retainages						$	55,172					$	46,670
Included in Other Assets:
Retainages						$	1,488					$	1,412
Advance billings on contracts						$	83,581					$	75,425

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Of the remaining performance obligations on our contracts with customers at December 31, 2020, we expect to recognize revenues as follows:

						2021						2022						Thereafter						Total
						(In approximate millions)
Nuclear Operations Group						$	1,221					$	919					$	1,519					$	3,659
Nuclear Power Group						307						171						248						726
Nuclear Services Group						21						—						—						21
Total Remaining Performance Obligations						$	1,549					$	1,090					$	1,767					$	4,406

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

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X

- Definition

Tabular disclosure of expected timing for satisfying remaining performance obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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