Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregated Revenues

Revenues by geographical area and customer type were as follows:

	Three Months Ended March 31, 2020									Three Months Ended March 31, 2019
	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	$	401,066	$	—	$	24,596	$	425,662		$	297,303	$	—	$	24,451	$	321,754
Non-Government	20,841		9,608		11,209		41,658			5,338		9,162		4,353		18,853
	$	421,907	$	9,608	$	35,805	$	467,320		$	302,641	$	9,162	$	28,804	$	340,607
Canada:
Non-Government	$	—	$	74,527	$	960	$	75,487		$	—	$	68,611	$	290	$	68,901
Other:
Non-Government	$	1,868	$	3,782	$	—	$	5,650		$	2,160	$	6,626	$	—	$	8,786
Segment Revenues	$	423,775	$	87,917	$	36,765	548,457			$	304,801	$	84,399	$	29,094	418,294
Adjustments and Eliminations							(6,249		)							(1,840		)
Revenues							$	542,208								$	416,454

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

	Three Months Ended March 31, 2020									Three Months Ended March 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total			Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
Over time	$	423,739	$	77,185	$	36,765	$	537,689		$	304,733	$	70,661	$	29,094	$	404,488
Point-in-time	36		10,732		—		10,768			68		13,738		—		13,806
Segment Revenues	$	423,775	$	87,917	$	36,765	548,457			$	304,801	$	84,399	$	29,094	418,294
Adjustments and Eliminations							(6,249		)							(1,840		)
Revenues							$	542,208								$	416,454

Revenues by contract type were as follows:

	Three Months Ended March 31, 2020									Three Months Ended March 31, 2019
	Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total			Nuclear Operations Group		Nuclear Power Group		Nuclear Services Group		Total
	(In thousands)
Fixed-Price Incentive Fee	$	284,374	$	492	$	—	$	284,866		$	245,487	$	273	$	—	$	245,760
Firm-Fixed-Price	113,337		70,836		11,637		195,810			39,343		61,998		6,168		107,509
Cost-Plus Fee	25,996		—		22,493		48,489			19,853		—		22,535		42,388
Time-and-Materials	68		16,589		2,635		19,292			118		22,128		391		22,637
Segment Revenues	$	423,775	$	87,917	$	36,765	548,457			$	304,801	$	84,399	$	29,094	418,294
Adjustments and Eliminations							(6,249		)							(1,840		)
Revenues							$	542,208								$	416,454

Schedule of Contract Assets and Liabilities

	March 31,		December 31,
	2020		2019
	(In thousands)
Included in Contracts in progress:
Unbilled receivables	$	397,925	$	365,861
Retainages	$	62,385	$	46,670
Included in Other Assets:
Retainages	$	1,457	$	1,412
Advance billings on contracts	$	80,065	$	75,425

Schedule of Remaining Performance Obligations

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

	2020		2021		Thereafter		Total
	(In approximate millions)
Nuclear Operations Group	$	1,116	$	1,043	$	2,123	$	4,282
Nuclear Power Group	183		183		412		778
Nuclear Services Group	34		6		11		51
Total Remaining Performance Obligations	$	1,333	$	1,232	$	2,546	$	5,111