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Revenue Recognition
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Recognition REVENUE RECOGNITION
Disaggregated Revenues
Revenues by geographical area and customer type were as follows:
 Three Months Ended June 30, 2020Three Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
United States:
Government$370,060  $—  $28,486  $398,546  $343,048  $—  $28,823  $371,871  
Non-Government
38,084  6,989  3,731  48,804  14,612  8,973  788  24,373  
$408,144  $6,989  $32,217  $447,350  $357,660  $8,973  $29,611  $396,244  
Canada:
Non-Government
$—  $57,380  $1,111  $58,491  $—  $66,160  $218  $66,378  
Other:
Non-Government
$2,108  $3,614  $—  $5,722  $692  $11,506  $—  $12,198  
Segment Revenues$410,252  $67,983  $33,328  511,563  $358,352  $86,639  $29,829  474,820  
Eliminations(7,043) (3,589) 
Revenues$504,520  $471,231  
 Six Months Ended June 30, 2020Six Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
United States:
Government$771,126  $—  $53,082  $824,208  $640,351  $—  $53,274  $693,625  
Non-Government
58,925  16,597  14,940  90,462  19,950  18,135  5,141  43,226  
$830,051  $16,597  $68,022  $914,670  $660,301  $18,135  $58,415  $736,851  
Canada:
Non-Government
$—  $131,907  $2,071  $133,978  $—  $134,771  $508  $135,279  
Other:
Non-Government
$3,976  $7,396  $—  $11,372  $2,852  $18,132  $—  $20,984  
Segment Revenues$834,027  $155,900  $70,093  1,060,020  $663,153  $171,038  $58,923  893,114  
Eliminations(13,292) (5,429) 
Revenues$1,046,728  $887,685  
Revenues by timing of transfer of goods or services were as follows:
 Three Months Ended June 30, 2020Three Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
Over time$410,204  $61,590  $33,328  $505,122  $358,294  $72,793  $29,829  $460,916  
Point-in-time48  6,393  —  6,441  58  13,846  —  13,904  
Segment Revenues
$410,252  $67,983  $33,328  511,563  $358,352  $86,639  $29,829  474,820  
Eliminations
(7,043) (3,589) 
Revenues
$504,520  $471,231  
 Six Months Ended June 30, 2020Six Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
Over time$833,943  $138,775  $70,093  $1,042,811  $663,027  $143,454  $58,923  $865,404  
Point-in-time84  17,125  —  17,209  126  27,584  —  27,710  
Segment Revenues
$834,027  $155,900  $70,093  1,060,020  $663,153  $171,038  $58,923  893,114  
Eliminations
(13,292) (5,429) 
Revenues
$1,046,728  $887,685  
Revenues by contract type were as follows:
 Three Months Ended June 30, 2020Three Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
Fixed-Price Incentive Fee$317,180  $394  $—  $317,574  $299,155  $1,308  $—  $300,463  
Firm-Fixed-Price64,193  61,866  6,911  132,970  36,697  77,205  3,904  117,806  
Cost-Plus Fee
28,827  —  24,018  52,845  22,286  8  25,780  48,074  
Time-and-Materials52  5,723  2,399  8,174  214  8,118  145  8,477  
Segment Revenues
$410,252  $67,983  $33,328  511,563  $358,352  $86,639  $29,829  474,820  
Eliminations
(7,043) (3,589) 
Revenues
$504,520  $471,231  
 Six Months Ended June 30, 2020Six Months Ended June 30, 2019
Nuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		TotalNuclear
Operations
Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
Fixed-Price Incentive Fee$601,554  $886  $—  $602,440  $544,642  $1,581  $—  $546,223  
Firm-Fixed-Price177,530  132,702  18,548  328,780  76,040  139,203  10,072  225,315  
Cost-Plus Fee
54,823  —  46,511  101,334  42,139  8  48,315  90,462  
Time-and-Materials120  22,312  5,034  27,466  332  30,246  536  31,114  
Segment Revenues
$834,027  $155,900  $70,093  1,060,020  $663,153  $171,038  $58,923  893,114  
Eliminations
(13,292) (5,429) 
Revenues
$1,046,728  $887,685  
Performance Obligations
As we progress on our contracts and the underlying performance obligations for which we recognize revenue over time, we refine our estimates of variable consideration and total estimated costs at completion, which impact the overall profitability on our contracts and performance obligations. Changes in these estimates result in the recognition of cumulative catch-up adjustments that impact our revenues and/or costs of contracts. During the three months ended June 30, 2020 and 2019, we recognized net favorable changes in estimates that resulted in increases in revenues of $11.4 million and $16.6 million, respectively. During the six months ended June 30, 2020 and 2019, we recognized net favorable changes in estimates that resulted in increases in revenues of $21.0 million and $21.4 million, respectively.
Contract Assets and Liabilities
We include revenues and related costs incurred, plus accumulated contract costs that exceed amounts invoiced to customers under the terms of the contracts, in Contracts in progress. We include in Advance billings on contracts billings that exceed accumulated contract costs and revenues recognized over time. Amounts that are withheld on our fixed-price incentive fee contracts are classified within Retainages. Certain of these amounts require conditions other than the passage of time to be achieved, with the remaining amounts only requiring the passage of time. Most long-term contracts contain provisions for progress payments. Our unbilled receivables do not contain an allowance for credit losses as we expect to invoice customers and collect all amounts for unbilled revenues. Changes in Contracts in progress and Advance billings on contracts are primarily driven by differences in the timing of revenue recognition and billings to our customers. During the six months ended June 30, 2020, our unbilled receivables increased $16.3 million primarily as a result of the timing of milestone billings on certain firm-fixed-price contracts within our Nuclear Power Group segment, partially offset by decreases in unbilled receivables within our Nuclear Operations Group segment. During the six months ended June 30, 2020, our Advance billings on contracts decreased $10.6 million primarily as a result of revenue recognized in excess of billings. Our fixed-price incentive fee contracts for our Nuclear Operations Group segment include provisions that result in an increase in retainages on contracts during the first and third quarters of the year, with larger payments made during the second and fourth quarters. Retainages also vary as a result of timing differences between incurring costs and achieving milestones that allow us to recover these amounts.
 June 30,December 31,
 20202019
 (In thousands)
Included in Contracts in progress:
Unbilled receivables$382,191  $365,861  
Retainages$46,767  $46,670  
Included in Other Assets:
Retainages$1,391  $1,412  
Advance billings on contracts$64,815  $75,425  
During the three months ended June 30, 2020 and 2019, we recognized $12.2 million and $16.7 million of revenues that were in Advance billings on contracts at December 31, 2019 and 2018, respectively. During the six months ended June 30, 2020 and 2019, we recognized $42.4 million and $50.5 million of revenues that were in Advance billings on contracts at December 31, 2019 and 2018, respectively.
Remaining Performance Obligations
Remaining performance obligations represent the dollar amount of revenue we expect to recognize in the future from performance obligations on contracts previously awarded and in progress. Of the remaining performance obligations on our contracts with customers at June 30, 2020, we expect to recognize revenues as follows:
20202021ThereafterTotal
(In approximate millions)
Nuclear Operations Group$722  $1,098  $2,094  $3,914  
Nuclear Power Group178  209  384  771  
Nuclear Services Group33  5  5  43  
Total Remaining Performance Obligations$933  $1,312  $2,483  $4,728